• Be part of an agile team to develop scalable, highly available core platform services.
• Participate and contribute to requirements analysis and architecture.
• Collaborate with product managers, architects, engineering leaders and test engineers.
• Understand performance and scalability principles and apply when developing software.
• Document and communicate clearly architecture and implementation solutions.
• Troubleshoot and support current platform in production.
• This position requires the ability to be part of on-call rotation, troubleshooting customer issues and drive issues to resolution.

• 8+ years of industry experience in server-side development.
• 4+ years of Java backend development.
• Experience with any public cloud platform.
• Deep knowledge and experience in building Spring Framework applications.
• Strong Computer Science fundamentals in design, data structures, algorithms, problem solving and complexity analysis.
• Strong multithreading knowledge and experience.
• Experience in designing and implementing RESTful and RPC interfaces.
• Experience in applying design patterns and separating concerns in a distributed system.
• Experience architecting, developing and deploying internet scale, distributed and mission critical services.
• Strong understanding of event-driven systems.
• Experience working with SQL and NoSQL databases and caches.
• Experience working within an Agile/Scrum team.
• Positive, self-motivated and enthusiastic attitude with a strong-sense of ownership.
• Strong communication skills, both verbal and written.

Benefits:

• Five9 Shares
• Bonus Scheme
• 10% Flexi Benefit
• Meal Allowance
• Medical Insurance
• Life Insurance 
• 25 day Annual Leave + Public Holidays

The team

The Core Applications team takes pride in providing exceptional support and innovative solutions for a diverse range of essential applications and tools, including our Nimbus component library.
We have a passion for excellence. Our dedicated team is committed to optimising user experiences, streamlining workflows, and enhancing productivity across the board. Whether empowering agents with intuitive interfaces, empowering supervisors with powerful management tools, or enabling seamless access to critical applications via multiple platforms, we strive to deliver with utmost efficiency and customer satisfaction.
Our mission is to shape the future of Five9, where innovation and collaboration go hand in hand as we strive to build a world-class ecosystem of integrated solutions that cater to the ever-evolving needs of our valued users.

Role purpose

This role of a Sr Software Engineer– Frontend in the Core Applications team is to develop, maintain, and advance the component library across Five9. Responsibilities include software design and development, testing and documentation across our React component library. A passion for developing consistent, high-quality, and performant user interfaces is a necessity.

How you contribute

• Build Reusable, Responsive, and WCAG Accessible components for our design system and web applications. Translate Figma designs into component code to align with design specifications.
• Maintain and Organize the Design Token system, bootloader, and codemods in collaboration with other Nimbus developers and the design team.
• Continuously Improve our React component library with the latest in frontend packages, patterns, and best practices.
• Ensure Seamless Deployment by implementing CI/CD unit tests, integration tests, and visual regression tests, publish, and communicate component library enhancements.
• Collaborate closely with our cross-functional teams including the design team, product managers, UI Architects, and other frontend developers to build new components and make improvements to existing components.
• Advocate and Propose standards, best practices, and guidelines, to ensure high-quality scalable and maintainable code.
• Mentor and Support other team members with quality-focused code reviews, strategic planning, and knowledge-sharing approach.

Skills, competencies and qualifications

Required:

• 5+ years of post-internship experience with React and TypeScript.
• Strong proficiency in semantic HTML, CSS (preferably SCSS), and JavaScript.
• Experience with component libraries, design systems, and design tokens.
• Have a keen-eye with attention to detail, and problem-solving skills.
• Strong expertise in Web Content Accessibility Guidelines (WCAG).
• Experience with frontend tooling and migration (preferably Vite and Codemod)
• Experience with testing (e.g. React Testing Library, Enzyme, Cypress, Chromatic).
• Experience working closely with designers using Figma.
• Excellent English communication skills, both verbal and written, with a proactive approach to collaboration.
• Self-motivated, enthusiastic, and ownership-driven, with a strong commitment to delivering solutions.
• Bachelor’s degree (or equivalent) in relevant discipline.

Desirable:

• Experience with Tokens Studio and Style Dictionary for managing Design Tokens
• Experience with Storybook.
• Experience with bundlers (e.g. Rollup),
• Deep understanding of CORS, CDNs, i18n

Benefits:

• Five9 Shares
• Bonus Scheme
• 10% Flexi Benefit
• Meal Allowance
• Medical Insurance
• Life Insurance 
• 25 day Annual Leave + Public Holidays

Overview

As a Staff Engineer at Five9, you will work on core backend services that power our global cloud contact center platform. You will tackle complex engineering challenges at scale, remain deeply involved in coding, and contribute to a culture that values craftsmanship, innovation, and technical excellence—while mentoring others and shaping best practices.

What You’ll Do

• Design, develop, and optimize high-performance microservices using Java and Spring Boot
• Write clean, maintainable, and testable code with a strong focus on scalability, reliability, and performance
• Take ownership of services end-to-end — from design and implementation to deployment, monitoring, and ongoing operations
• Collaborate with architects and senior engineers on system design, technical reviews, and problem-solving
• Ensure services meet SLAs, performance metrics, and security standards
• Contribute to improving CI/CD pipelines, automation, and observability to reduce manual effort and improve service reliability
• Provide technical guidance and mentorship to mid-level and junior engineers through code reviews, pairing, and knowledge sharing
• Stay current with evolving technologies and help evaluate and adopt tools that strengthen our platform

What You Bring

• Strong debugging and problem-solving skills, with the ability to dive deep into complex production issues
• 7–10 years of development experience in Java microservices
• Deep expertise in Java, with strong experience in Spring / Spring Boot
• Proven ability to build and operate distributed, cloud-native microservices at scale
• Strong experience with GCP services (GKE, Pub/Sub, BigQuery, CockroachDB, Redis)
• Experience with Kubernetes, containerization, and CI/CD pipelines (GitLab or similar)
• Practical knowledge of SQL and NoSQL databases and caching strategies
• Solid understanding of system design, data structures, algorithms, and performance optimization
• Understanding of product architecture
• Comfortable leveraging agentic coding tools and AI-assisted development environments to enhance productivity and code quality

Nice to Have

• Experience in latency-sensitive, high-throughput systems
• Familiarity with Looker, analytics pipelines, and large-scale reporting systems
• Familiarity with Agile methodologies, JIRA, Confluence, and end-to-end testing practices
• Exposure to frontend technologies such as React and TypeScript

Technology & Tools

• Languages & Frameworks: Java, Spring, Spring Boot
• Cloud & Infrastructure: GCP (GKE, Pub/Sub, BigQuery, CockroachDB, Redis), Kubernetes
• DevOps & CI/CD: Git, GitLab CI/CD
• Collaboration & Documentation: Swagger, JIRA, Confluence

Overview

We are seeking a Director of Engineering – Digital to lead the digital transformation of our contact center technology ecosystem. This role will drive the development and implementation of cutting-edge AI-powered customer engagement platforms, cloud-based contact center solutions, and omnichannel communication strategies.

The ideal candidate will bring deep expertise in cloud contact centers (CCaaS), conversational AI, automation, and customer experience (CX) optimization, along with strong technical depth and leadership capabilities.

What You’ll Do

As a Director of Engineering at Five9, you will:

• Define and execute the technology roadmap for the digital campaign management platform, ensuring alignment with business goals
• Lead and mentor a team of engineers, fostering a culture of innovation, collaboration, and technical excellence
• Architect and oversee the development of AI-driven features that enhance connect rates and conversion rates across multiple digital channels
• Ensure scalability, security, and reliability in a multi-tenant SaaS environment
• Collaborate with product managers, designers, and data scientists to develop and deploy cutting-edge campaign optimization techniques
• Stay ahead of emerging technologies and industry trends, integrating best practices into the development process
• Establish engineering best practices, CI/CD pipelines, and DevOps methodologies to improve development velocity
• Manage engineering budgets, resource allocation, and vendor relationships
• Work closely with operations, customer service, IT, and business leaders to align digital solutions with company objectives
• Ensure 99.99% uptime, scalability, and resilience of digital platforms to handle high call volumes

What You Bring

As a Director of Engineering at Five9, you will need:

• Bachelor’s or Master’s degree in Computer Science, Engineering, or a related field
• 12+ years of software engineering experience, with at least 5 years in a leadership role
• Proven track record of building and scaling AI-powered SaaS products, preferably in digital marketing or customer engagement domains
• Expertise in modern software architectures, cloud computing (AWS/Azure/GCP), and microservices-based development
• Strong experience with AI/ML technologies, NLP, and predictive analytics for customer engagement
• Hands-on experience with programming languages such as Java, and modern front-end frameworks such as React, with strong full-stack engineering capabilities
• Strong technical depth with the ability to be hands-on when needed, and comfort leveraging agentic coding tools and AI-assisted development environments to improve engineering productivity
• Knowledge of campaign management, customer journey automation, and omnichannel engagement strategies
• Experience working with social media and messaging APIs (e.g., WhatsApp Business API, Instagram API, etc.)
• Strong understanding of data privacy, security compliance, and scalability challenges in multi-tenant SaaS platforms
• Excellent leadership, communication, and problem-solving skills
• Experience working in a fast-paced, high-growth or startup environment
• Familiarity with A/B testing, personalization, and analytics-driven product development
• Understanding of GDPR, CCPA, and other data protection regulations

Why Join Us

• Lead the digital evolution of a high-impact contact center technology ecosystem
• Work on AI-driven automation and CX optimization with cutting-edge technologies
• Opportunity to shape the future of AI-powered customer engagement technology
• Collaborate with a talented and passionate team dedicated to innovation
• Be part of a dynamic and customer-focused organization driving innovation in customer engagement
• Competitive salary, benefits, and career growth opportunities

About the Job

We are building a Customer Data Platform (CDP) designed to unlock the full potential of customer experience (CX) across our products and services. This role offers the opportunity to design and scale a platform that unifies customer data from multiple sources, ensures data quality and governance, and provides a single source of truth for analytics, personalization, and engagement.

As a key member of the data engineering team, you will architect and implement the pipelines, storage layers, and integrations that power our CDP. You’ll work with product, data science, and engineering stakeholders to deliver a robust platform that supports real-time decision-making, personalization at scale, and actionable customer insights.

This is a high-impact, hands-on engineering role where you’ll shape the data foundation that directly influences how we understand and serve our customers.

What You Will Be Doing

• Design and implement Five9’s Customer Data Platform solutions and enable production use cases for customers

• Design and develop highly scalable and resilient services for ingesting large-scale datasets

• Demonstrate strong ownership by ensuring operational excellence with a sharp focus on monitoring, observability, and system reliability

• Develop and orchestrate ETL/ELT pipelines using Apache Airflow

• Collaborate with cross-functional partners and lead technical initiatives independently end-to-end

• Design, build, and optimize distributed query engines such as Apache Spark or Snowflake to support complex data workloads

• Write, review, or provide feedback on technical design proposals from others

Skills

• 5–7 years of software/data engineering and data platform experience

• Extensive experience with data transformation and modeling, including advanced features and best practices

• Deep knowledge of Snowflake for data warehousing, including optimization, security, and cost management

• Good understanding of data streaming technologies such as Kafka/Kafka Connect

• Strong knowledge of highly scalable distributed systems, microservices, REST APIs

• Strong proficiency in object-oriented and/or functional programming languages such as Java, .NET, Python, and SQL for data processing, transformation, and pipeline development

• Knowledge of Apache Airflow for workflow orchestration is nice to have

• Understanding of containerization and Kubernetes concepts

• Experience with the AWS cloud platform and infrastructure-as-code practices

• Maintain high standards of code quality with a keen eye for test automation and operational excellence

• Track record of delivering scalable data engineering solutions that support analytics, machine learning, and operational use cases

• Excellent written and verbal communication and interpersonal skills

• Bachelor’s degree in Computer Science, Engineering, or related field, or equivalent training, fellowship, or work experience

We are looking for a Senior Manager of Engineering for our CRM & SDK team, to lead a group of talented engineers that is responsible for integration of Five9 software into CRM systems (MS Dynamics, ServiceNow) and expanding APIs available for customization of Five9 platform.

This person will have experience in developing software as a service with emphasis on automation, strong analytical and troubleshooting skills, and has exceptional leadership and communication skills.

Key Responsibilities: 

• Mentor staff to develop their full potential with 1:1’s, appraisals, training, career development, recruitment, and performance in accordance with company practices.
• Work with Product team, and scrum teams to make sure the backlogs are properly groomed, requirements are defined and delivery of product using our cloud train best practices.
• Perform code reviews, guide software architecture and technical decisions.
• Drive the team to manage customer expectations of uptime and performance by defining and reviewing SLO/SLI's, developing metrics to measuring as such and maintaining for all the services.
• Measure team performance and results to drive focus and inspire top performance.
• Report on progress of schedules and tasks to senior leadership and program management.
• Develop and manage collaborative relationships with vendors for utilized components and/or services.
• Participate in on-call escalation rotations for provided services.

Key Requirements: 

• 10+ years of industry experience with 2-4 years as leading teams to deliver customer facing products.
• Experienced in leading, coaching, and mentoring Software Development teams and delivering high quality software together with them.
• Effective communication (verbal, writing and presentation) and leadership skills are essential.
• Experience in developing software in cloud (GCP), microservices architecture is a must.
• Experience of developing UI software, knowledge of modern UI frameworks and technologies: React, micro frontends
• Work with Architecture team and senior staff to set technical direction of team.
• Self-motivated, strong sense of accountability, good team player, able to handle multiple tasks at once and work independently with minimal supervision.

Role Overview

Our team loves technology as much as you do. We are looking for an experienced, high-energy senior quality engineer for our Digital team based in India.

You will have ownership of engineering design, coding, and implementation of Cloud Test Platform CI/CD automation. This includes tools and frameworks necessary to support testing and release builds. You will apply your technical knowledge, leadership skills, software development methodologies, best practices, and proven processes to consistently deliver a great quality product in a predictable manner.

The role is also an ambassador of quality engineering principles in collaboration with developers and product owners. The main goal of this role is to develop code test scenarios in a Cloud/Java/Terraform environment. This role will define test processes and goals together with development architects and ensure test plans are appropriate, including the review of plans done by developers. This role will also assist in the definition and creation of tests and scripts to support customer journey scenarios for contact center features.

Qualifications & Skills

• Ownership of engineering design, coding, and implementation of Cloud Test Platform CI/CD automation
• Tools and frameworks necessary to support testing and release builds
• Technical knowledge, leadership skills, software development methodologies, best practices, and proven processes to consistently deliver a great quality product in a predictable manner
• Ambassador of quality engineering principles in collaboration with developers and product owners
• Develop code test scenarios in a Cloud/Java/Terraform environment
• Define test processes and goals together with development architects and ensure test plans are appropriate, including the review of plans done by developers
• Assist in the definition and creation of tests and scripts to support customer journey scenarios for contact center features
• Ability to think quickly, with the ability to make decisions with incomplete data
• Bring energy, positivity, and drive to your team

Key Responsibilities

• Design and code test solutions around the Cloud Platform environment with test-as-infrastructure principles
• Champion, design, and implement web accessibility testing strategies and automation to ensure products meet WCAG and other accessibility standards
• Lead Quality and Automation initiatives across multi-disciplinary teams, coordinating process definition, best practices, and efficient usage of infrastructure
• Participate in Agile software development initiatives (standup, planning, and Increment planning) to support innovation and enhancement of automation frameworks and tools through iteration/functionality testing
• Work closely with operations and sustaining teams to ensure platform availability
• Build sustainable engineering practices through, among other things, active code reviews, architecture discussions, guided by the selection of technologies, and mentorship
• Ensure continuous resource utilization and drive continuous efficiency improvements

As part of the Outbound Campaigns team, you will be working on breaking down a monolith and building Five9’s next generation, cutting-edge Modern microservices platform. An ideal candidate for us is an experienced engineering manager who has strong background in software development combined with proven leadership skills to mentor and grow high-performing engineering teams. This team is focused on building high performance scalable microservices with test driven development mindset. 

 
Key Responsibilities: 

• Be part of the Outbound Campaigns Team, focused on building the next generation outbound campaigns management features in the public multi-cloud and hybrid-cloud solutions. 
• Lead, mentor, and develop a team of engineers, fostering a culture of collaboration and innovation. 
• Oversee the design, development, and execution of engineering projects, ensuring quality, timelines, and budget compliance. 
• Provide technical guidance and mentorship to engineers on the team 
• Conduct code reviews and ensure high code quality and standards adherence 
• Identify technical debt and propose and implement solutions for improvement 
• Stay updated on emerging technologies and best practices in software engineering 
• Collaborate with cross-functional teams like Product, Quality, Ops and other development teams to drive technical initiatives forward 
• Conduct performance evaluations, set career development goals, and support professional growth for team members. 

Requirements: 

• Bachelor's degree in Computer Science, Engineering, or related field (Master's degree preferred) 
• 12 + years of experience in designing and developing distributed, and scalable systems, with at least 3 years in a leadership or management role 
• Experience in breaking down monoliths into microservices with an emphasis on resiliency 
• Proven experience managing and scaling engineering teams. 
• Excellent problem-solving, communication, and leadership skills. 
• Familiarity with Agile methodologies, DevOps practices, and modern engineering workflows. 
• Experience working with cloud platforms, CI/CD pipelines, and scalable architectures is a plus 
• Strong problem-solving skills and ability to think strategically 
• Excellent communication and collaboration skills 
• Ability to thrive in a fast-paced and dynamic environment 
• You understand what it takes to run mission critical software in production 

Benefits:

• Five9 Shares
• Bonus Scheme
• 10% Flexi Benefit
• Meal Allowance
• Medical Insurance
• Life Insurance 
• 25 day Annual Leave + Public Holidays

About Five9

Five9 is a global leader in cloud software for the enterprise contact center market, powering billions of customer interactions annually. Since 2001, Five9 has been at the forefront of the cloud revolution, helping organizations deliver exceptional customer experiences, improve productivity, and achieve measurable business outcomes. 

We are expanding our engineering and delivery teams in Bangalore and are seeking passionate professionals to help design, implement, and scale Five9’s next-generation cloud-native services

Overview

We are looking for a highly skilled Full-Stack Developer with expertise in .NET Core, to develop and maintain scalable web applications and microservices. The ideal candidate will have strong problem-solving skills, experience in modern software development, and a passion for creating robust, high-performance applications.

Key Responsibilities

Backend Development:

• Design, develop, and maintain microservices and APIs using .NET Core. Should have a good understanding of .NET Framework.
• Implement RESTful APIs, ensuring high performance and security.
• Optimize database queries and design schemas for SQL Server / Snowflake / MongoDB.

Software Architecture & DevOps:

• Design and implement scalable microservices architecture.
• Work with Docker, Kubernetes, and CI/CD pipelines for deployment and automation.
• Ensure best practices in security, scalability, and performance.

Collaboration & Agile Development:

• Work closely with UI/UX designers, backend engineers, and product managers.
• Participate in Agile/Scrum ceremonies, code reviews, and knowledge-sharing sessions.
• Write clean, maintainable, and well-documented code.

Qualifications & Skills

• 7+ years of experience as a Full-Stack Developer.

• Strong experience in .NET Core, C#.

• Proficiency in React.js, JavaScript (ES6+), TypeScript.

• Experience with RESTful APIs, Microservices architecture.

• Knowledge of SQL / NoSQL databases (SQL Server, Snowflake, MongoDB).

• Experience with Git, CI/CD pipelines, Docker, and Kubernetes.

• Familiarity with Cloud services (Azure, AWS, or GCP) is a plus.

• Strong debugging and troubleshooting skills

Nice to Have

• Experience with GraphQL, gRPC, or WebSockets

• Knowledge of authentication/authorization frameworks (OAuth, JWT, Identity Server)

• Exposure to serverless architecture and cloud-native best practices

• Background in automated testing (unit, integration) 

Why Five9

At Five9, we believe that technology is only as powerful as the people behind it. You’ll be part of a team that values collaboration, innovation, and accountability, and you’ll have the opportunity to make a meaningful impact on how global enterprises engage with their customers.

The Team

The Core Applications team takes pride in providing exceptional support and innovative solutions for a diverse range of essential applications and tools, including Agent Desktop Plus, Supervisor Plus, Admin Console, Freedom Application Platform, Internal Admin (Shell), Agent Assist UI, Nimbus, and Unified Portal / Login.

We have a passion for excellence. Our dedicated team is committed to optimizing user experiences, streamlining workflows, and enhancing productivity across the board. Whether empowering agents with intuitive interfaces, empowering supervisors with powerful management tools, or enabling seamless access to critical applications via multiple platforms, we strive to deliver with utmost efficiency and customer satisfaction.

Our mission is to shape the future of Five9, where innovation and collaboration go hand in hand as we strive to build a world-class ecosystem of integrated solutions that cater to the ever-evolving needs of our valued users.

Role Purpose

The role of a Senior Software Engineer in the Core Applications team is to design, develop, and maintain software solutions across the Core Applications software suite. Responsibilities include software architecture, design and development, testing and documentation across our backend and front-end platforms to deliver end-to-end features, working with product owners and designers to design and deliver new features and create high-quality user interfaces, taking operational responsibility for the performance and quality of services owned by the team, including taking part in an on-call rotation, deep diving into cutting edge technologies and working with the products team to transfer ideas into products. The role is also responsible for mentoring other developers at Five9.

How You Contribute

• Understands various programming languages, frameworks, and development methodologies, which allow you to make informed decisions and solve complex technical challenges.

• Writing high-quality, efficient, and maintainable code. Should follow coding best practices and contribute to the development of software modules, features, and functionalities.

• Troubleshoot and resolve complex technical issues. When problems arise, you use your experience and problem-solving skills to identify the root causes and implement effective solutions.

• Ensure that the development stays on track, milestones are met, and the project aligns with business objectives.

• Collaborate with cross-functional teams, including product managers, designers, and quality assurance professionals, to ensure that everyone is aligned on project goals and progress.

• Follows and contributes to processes, documentation, specifications, and APIs.

Skills, Competencies and Qualifications

Required

• Highly proficient in a variety of programming languages, including but not limited to TypeScript/JavaScript, Java, PHP, or others as required.

• Strong experience with web development technologies such as HTML, CSS, TypeScript/JavaScript, and modern front-end frameworks like React.

• Strong experience with server-side technologies, REST API design and implementation, microservice architecture, databases (SQL, NoSQL, and Redis), and back-end frameworks like Java Spring Boot.

• Awareness of web security best practices and the ability to implement security measures to protect applications and data.

• A portfolio of past projects showcasing full-stack design and development skills.

• Ability to work independently and as part of a collaborative team.

• Strong commitment to delivering high-quality, performant, and scalable code and solutions on time and within scope.

• Ability to mentor other developers directly and via code reviews.

• Bachelor’s degree (or equivalent) in relevant discipline.

Desirable

• Experience with Contact Centre, IVR, Virtual Agents, VoIP and telecommunications service providers is advantageous.

• Experience with Google Cloud Platform, Kubernetes, and CI/CD.

Other Requirements

• This position requires the ability to be On Call.

Key Relationships

There are no direct reports to this role. Key stakeholders include:

• Service owners and their teams

• Technical leadership and senior management, including VPs

• Engineering teams

• Network and Telecom teams

• Customer service teams

• Compliance and infosec teams

This is not a customer-facing role.

• Be part of an agile team to develop a scalable, highly available cloud contact center software using Java and single-page JavaScript.
• Collaborate with Product Managers, Architects, Engineering leaders and Test Engineers.
• Deliver scalable software in both private cloud and public cloud settings (AWS and Google Cloud Platform).
• Deliver using containers (docker, Kubernetes) using CI/CD in a DevOps model.
• Bring a positive attitude to the team, helping mentor more junior engineers, drive our standards, show ownership and an obsession for our customers.

• 2+ years of professional experience developing Java applications – including delivering RESTful and gRPC apis. 
• 5+ years of professional or open-source experience writing JavaScript MVC.
• Agile coding experience, working in small teams making a big impact fast.
• Familiarity with standard javascript async patterns (events, closures, callbacks, promises, error handling, etc.).
• Strong CS fundamentals and an object oriented language (think an undergrad CS degree, or similar amount of work experience).
• Positive, self-motivated and enthusiastic with a strong sense of ownership.

• Experience with Salesforce integrations as OpenCTI and Service Cloud Voice.
• Experience with Voice applications and/or SIP Protocols.
• Experience with Contact Center or Call Center software.
• 1+ years of professional or open-source experience with a JavaScript MVC toolkit such as React, Dojo, AngularJS, Backbone.js, Knockout or Ember.js.
• 1+ years of experience delivering production software using Containers (Docker or similar).
• 1+ years of experience delivering production software into Public Cloud.
• Experience in a modern consumer environment (Pinterest, Box, Quora, Facebook...) and/or open source projects (contributed to node.js, dojo toolkit, NPM modules, etc).
• Experience with GIT SCM.
• Passion for user experience and strong design experience.
• Experience with a data visualization package (Highcharts, d3.js, etc.).

Benefits:

• Five9 Shares
• Bonus Scheme
• 10% Flex Benefit
• Meal Allowance
• Medical Insurance
• Life Insurance 
• 25 day Annual Leave + Public Holidays

The Team  
 

CRM & SDK team is focusing on integrating Five9 dialer into multiple CRM systems and works with variety of backend and frontend technologies  
 
 
The Role Purpose 

• Be part of an agile team to develop a scalable, highly available global voice platform 

• Collaborate with Product Managers, Architects, Engineering leaders and Test Engineers Understand performance and scalability principles and apply them when developing software 

• Troubleshoot and support current platform in production (we embrace DevOps) Designs, develops, troubleshoots, debugs, and implements software code using JavaScript, Java, Spring, and related technologies 

• Write unit and functional tests, be able to document and communicate clearly 
   

Skills, Competencies and Qualifications Required 

• 5+ years of industry experience in backend development (Java) 

• 5+ years of industry experience in frontend development (JavaScript, TypeScript, React) 

• Deep knowledge and experience with frameworks such as Spring 

• Hands on Experience in designing and implementing scalable, high performing Microservices providing REST APIs 

• Strong expertise in web development technologies, including HTML, CSS, and modern front-end frameworks. 

• Experience working with cloud platforms such as GCP or AWS. 

• Expertise server-side technologies and databases (SQL or NoSQL). 

• Experience working on complex problems spanning multiple products and systems 

• Experience working within an Agile/Scrum team Positive, self-motivated and enthusiastic attitude with a strong sense of ownership 

• Strong communication skills, both verbal and written 
   

Desirable 

• Hands-on experience with Kubernetes for container orchestration. 

• Knowledge of real-time communications (SIP, RTP, etc.) is a plus. 

• Experience with Backbone, Handlebars. 

• Experience with automated testing frameworks (Nightwatch) 

Other Requirements 

This position requires the ability to be On Call. 

Key Relationships 

• There are no direct reports to this role. Key stakeholders include: 

• Service owners and their teams 

• Technical leadership and senior management, including VPs 

• Engineering teams 

• Network and Telecom teams 

• Customer service teams 

• Compliance and infosec teams 

• This is not a customer-facing role. 

The Team

The Core Applications team takes pride in providing exceptional support and innovative solutions for a diverse range of essential applications and tools, including Agent Desktop Plus, Supervisor Plus, Admin Console, Freedom Application Platform, Internal Admin (Shell), Agent Assist UI, Nimbus, and Unified Portal / Login.

We have a passion for excellence. Our dedicated team is committed to optimizing user experiences, streamlining workflows, and enhancing productivity across the board. Whether empowering agents with intuitive interfaces, empowering supervisors with powerful management tools, or enabling seamless access to critical applications via multiple platforms, we strive to deliver with utmost efficiency and customer satisfaction.

Our mission is to shape the future of Five9, where innovation and collaboration go hand in hand as we strive to build a world-class ecosystem of integrated solutions that cater to the ever-evolving needs of our valued users.

Role Purpose

The role of a Senior Software Engineer in the Core Applications team is to design, develop, and maintain software solutions across the Core Applications software suite. Responsibilities include software architecture, design and development, testing and documentation across our backend and front-end platforms to deliver end-to-end features, working with product owners and designers to design and deliver new features and create high-quality user interfaces, taking operational responsibility for the performance and quality of services owned by the team, including taking part in an on-call rotation, deep diving into cutting edge technologies and working with the products team to transfer ideas into products. The role is also responsible for mentoring other developers at Five9.

How You Contribute

• Understands various programming languages, frameworks, and development methodologies, which allow you to make informed decisions and solve complex technical challenges.

• Writing high-quality, efficient, and maintainable code. Should follow coding best practices and contribute to the development of software modules, features, and functionalities.

• Troubleshoot and resolve complex technical issues. When problems arise, you use your experience and problem-solving skills to identify the root causes and implement effective solutions.

• Ensure that the development stays on track, milestones are met, and the project aligns with business objectives.

• Collaborate with cross-functional teams, including product managers, designers, and quality assurance professionals, to ensure that everyone is aligned on project goals and progress.

• Follows and contributes to processes, documentation, specifications, and APIs.

Skills, Competencies and Qualifications

Required

• Highly proficient in a variety of programming languages, including but not limited to TypeScript/JavaScript, Java, PHP, or others as required.

• Strong experience with web development technologies such as HTML, CSS, TypeScript/JavaScript, and modern front-end frameworks like React.

• Strong experience with server-side technologies, REST API design and implementation, microservice architecture, databases (SQL, NoSQL, and Redis), and back-end frameworks like Java Spring Boot.

• Awareness of web security best practices and the ability to implement security measures to protect applications and data.

• A portfolio of past projects showcasing full-stack design and development skills.

• Ability to work independently and as part of a collaborative team.

• Strong commitment to delivering high-quality, performant, and scalable code and solutions on time and within scope.

• Ability to mentor other developers directly and via code reviews.

• Bachelor’s degree (or equivalent) in relevant discipline.

Desirable

• Experience with Contact Centre, IVR, Virtual Agents, VoIP and telecommunications service providers is advantageous.

• Experience with Google Cloud Platform, Kubernetes, and CI/CD.

Other Requirements

• This position requires the ability to be On Call.

Key Relationships

There are no direct reports to this role. Key stakeholders include:

• Service owners and their teams

• Technical leadership and senior management, including VPs

• Engineering teams

• Network and Telecom teams

• Customer service teams

• Compliance and infosec teams

This is not a customer-facing role.

In this SRE role, you will focus on the foundational work required to modernize our application deployments. The immediate priority is not deep application code integration, but rather tackling technical debt and enhancing our legacy Linux-based systems. This requires strong Linux system administration and problem-solving skills to ensure stability during our transition to cloud-native workflows. The software development portion of this role is centered on creating internal tools to improve system management, automate operational tasks, and build out our observability stack. Your success in this area is critical for establishing meaningful SLIs and achieving our reliability targets.

Key Responsibilities

Observability & Monitoring

• Dashboards & Metrics: Design and implement comprehensive dashboards covering OS/platform-level and application-level monitoring, broken into primary (RED) and secondary indicators (USE).

• Availability & Reliability: Establish and maintain SLIs, SLOs, and error budgets for the service.

• Performance Monitoring: Build alerting systems and performance monitoring to proactively identify and resolve issues before they impact users.

• Incident Response: Participate in on-call rotations, lead incident response efforts (including post-mortem analysis and remediation), maintain on-call routing, and assign application-level problems to engineering teams.

Infrastructure Automation & Deployment

• CI/CD Pipeline Management: Build and optimize CI/CD pipelines for speed and resilience.

• Infrastructure as Code: Develop and maintain infrastructure using tools like Terraform, Ansible, or similar.

• Configuration Management: Automate system configuration and ensure consistency across environments. Implement and recommend best practices for configuration control.

Security & Compliance

• Security Automation: Ensure security scanning systems are in place and review escalated vulnerabilities.

• Access Control: Maintain proper authentication, authorization, and audit logging systems.

• Compliance Reporting: Ensure systems meet regulatory and industry standards.

• Security Incident Response: Participate in security incident response and remediation efforts.

Cost Optimization

• Resource Management: Monitor and optimize cloud resource usage and costs.

• Capacity Planning: Analyze usage patterns and plan for future capacity needs.

• Cost Analysis: Provide recommendations for cost-effective architecture and resource allocation.

• Right-sizing: Implement automated scaling and resource optimization strategies.

Common Services & Platform Engineering

• Shared Infrastructure: Build and maintain common services (notification systems, caching layers, message queues, or third-party stacks).

• Database Operations: Manage database reliability, performance, and scaling (where not handled by DB teams).

• Service Mesh & Networking: Implement and maintain service discovery, load balancing, and network policies.

• Developer Tools: Create and maintain tools and platforms that improve developer productivity and reliability.

Required Qualifications

Technical Skills:
Experience level: 7+ years

- Demonstrated experience managing Production Linux virtual machine deployments of 50+ virtual machines.

- Programming Languages: Proficiency in at least two of Python, Shell, Java, NodeJS, or similar.

- Cloud Platforms: Experience with AWS, GCP, or Azure.

- Containerization: Hands-on experience with Docker, Kubernetes, and container orchestration.

- Monitoring & Observability: Experience with Prometheus, Grafana, ELK stack, or similar tools

- Infrastructure as Code: Proficiency with Ansible, Terraform, Helm, or similar

- Version Control: Expert-level Git usage and collaborative development practices.

- CI/CD Pipelines: Hands-on experience with GitLab CI/CD, GitHub Actions, or similar.

SRE-Specific Knowledge

• Experience defining and maintaining SLOs and SLIs.

• Understanding and implementation of error budget policies.

• Proven track record in toil reduction and automation.

• Experience with capacity planning and performance testing.

Preferred Qualifications

• Bachelor’s degree in Computer Science, Engineering, or equivalent experience.

• Experience with microservices and distributed systems.

• Knowledge of security best practices and compliance frameworks.

• Experience with chaos engineering and reliability testing.

• Prior experience in an SRE or DevOps role at a tech company.

• Contributions to open-source projects or technical communities.

Success Metrics

• Maintain or improve service availability and reliability metrics.

• Demonstrated reduction in manual operational work through automation.

• Effective participation in incident response and prevention.

• High-quality, well-tested code contributions.

• Strong collaboration with development teams to improve system reliability.

Team Culture & Values

• Blameless Post-Mortems: Learn from failures without blame.

• Automation First: Prefer automated solutions over manual processes.

• Measure Everything: Data-driven decisions and continuous improvement.

• Knowledge Sharing: Document and share expertise.

• Work-Life Balance: Sustainable on-call practices and reasonable load.

Growth Opportunities

• Work on cutting-edge infrastructure and reliability challenges.

• Exposure to large-scale distributed systems and modern cloud technologies.

• Clear career path toward Senior SRE, Staff Engineer, or Management roles.

• Collaboration with engineering teams across the organization.

We are actively seeking a Senior DevOps Engineer to join our Cloud Engineering Core Application Services team. At Five9, we work in small teams and move fast to drive our products and business to the next level. We look for crucial skills in team members such as a problem-solving mindset and intellectual curiosity, along with comfortable integration into a deeply collaborative system that rewards impact.

Key Responsibilities

• Design, implementation, and automation of large-scale distributed systems

• Build tools and automation that help Five9 achieve higher availability, scalability, latency, and efficiency

• Work with Engineering teams to deliver high quality software in a fast-paced environment

• Monitor production and development environments to build preventive measures and provide a seamless customer experience

• Work with delivery teams on software improvements to achieve higher availability and lower MTTD

• Participate in on-call rotation (8h shift, 7days a week, every 3-4 weeks)

Key Requirements

• 7 years of public cloud experience (GCP or AWS)

• 7 years of private cloud experience (Openstack, VMware ESXi)

• 7 years of Linux experience (Centos/Ubuntu)

• 7 years of networking experience

• Orchestration and management of containers using Kubernetes, Helm, GKE and Docker

• Experience with Gitlab, ArgoCD, CI/CD methodologies & tools

• Experience with Infrastructure as Code (Terraform), Python or other scripting languages

• Experience with config management tools such as Ansible and Puppet

• Experience in monitoring systems: Prometheus or LogicMonitor

• Excellent problem solving and analytical skills

• Experience with Incident Management Process, SRE best practices and continuous improvements

• Experience designing large scale distributed systems

• Strong verbal and written communications skills

• Bachelor's of Science degree in Computer Science or equivalent experience

The Team  
 

CRM & SDK team is focusing on integrating Five9 dialer into multiple CRM systems and works with variety of backend and frontend technologies  
 
 
The Role Purpose 

• Be part of an agile team to develop a scalable, highly available global voice platform 

• Collaborate with Product Managers, Architects, Engineering leaders and Test Engineers Understand performance and scalability principles and apply them when developing software 

• Troubleshoot and support current platform in production (we embrace DevOps) Designs, develops, troubleshoots, debugs, and implements software code using JavaScript, Java, Spring, and related technologies 

• Write unit and functional tests, be able to document and communicate clearly 
   

Skills, Competencies and Qualifications Required 

• 5+ years of industry experience in backend development (Java) 

• 5+ years of industry experience in frontend development (JavaScript, TypeScript, React) 

• Deep knowledge and experience with frameworks such as Spring 

• Hands on Experience in designing and implementing scalable, high performing Microservices providing REST APIs 

• Strong expertise in web development technologies, including HTML, CSS, and modern front-end frameworks. 

• Experience working with cloud platforms such as GCP or AWS. 

• Expertise server-side technologies and databases (SQL or NoSQL). 

• Experience working on complex problems spanning multiple products and systems 

• Experience working within an Agile/Scrum team Positive, self-motivated and enthusiastic attitude with a strong sense of ownership 

• Strong communication skills, both verbal and written 
   

Desirable 

• Hands-on experience with Kubernetes for container orchestration. 

• Knowledge of real-time communications (SIP, RTP, etc.) is a plus. 

• Experience with Backbone, Handlebars. 

• Experience with automated testing frameworks (Nightwatch) 

Other Requirements 

This position requires the ability to be On Call. 

Key Relationships 

• There are no direct reports to this role. Key stakeholders include: 

• Service owners and their teams 

• Technical leadership and senior management, including VPs 

• Engineering teams 

• Network and Telecom teams 

• Customer service teams 

• Compliance and infosec teams 

• This is not a customer-facing role. 

Overview
We are seeking a highly skilled Software Architect to design and guide the development of cloud-native, scalable, and resilient microservices. The ideal candidate will have deep technical expertise in distributed systems, event-driven architectures, and modern data platforms, and will play a critical role in setting the technical direction and architecture strategy for backend systems.

Key Responsibilities

• Architect end-to-end solutions for cloud-native applications with a strong focus on scalability, availability, performance, and security.
• Design and oversee the development of microservices architectures, ensuring clean service boundaries, loose coupling, and high maintainability.
• Define and guide the adoption of message queueing and streaming platforms (e.g., Kafka, Redis Streams, RabbitMQ) for event-driven communication and real-time processing.
• Architect and optimize data storage solutions, including distributed databases (e.g., Citus, PostgreSQL, Snowflake) to meet high availability and scalability requirements.
• Collaborate with engineering teams to define architecture blueprints, reference implementations, and technical standards.
• Perform architecture reviews, provide hands-on technical guidance, and ensure adherence to best practices in code quality, testing, observability, and security.
• Evaluate new technologies, frameworks, and tools; recommend and drive technology adoption aligned with long-term architectural goals.
• Work closely with DevOps, SRE, and security teams to ensure efficient CI/CD, infrastructure automation, and secure system design.
• Provide architectural support for customer-facing issues, performance bottlenecks, and production incidents.
• Advocate for domain-driven design (DDD), API-first design, and event-driven patterns across the engineering organization.

Minimum Qualifications 

• 10+ years of experience in software development, with 3+ years as a Software Architect or in a similar architectural leadership role.
• Proven experience in designing and deploying cloud-native applications using AWS, Azure, or GCP.
• Strong knowledge of microservices patterns, REST/gRPC APIs, and asynchronous communication.
• Hands-on experience with streaming and messaging platforms such as Apache Kafka, Redis Streams, RabbitMQ, or Amazon Kinesis.
• Expertise in distributed databases like Citus, Snowflake, PostgreSQL, Cassandra, or similar.
• Solid understanding of containerization and orchestration (e.g., Docker, Kubernetes, Helm).
• Familiarity with DevOps practices, including infrastructure as code (e.g., Terraform) and CI/CD pipelines.
• Experience with monitoring and observability tools such as Prometheus, Grafana, Datadog, ELK stack.
• Strong focus on scalability, performance tuning, reliability, and security best practices in architecture.

Preferred Qualifications

• Bachelor’s or Master’s degree in Computer Science, Engineering, or a related technical field.
• Experience with event sourcing, CQRS, or real-time data processing architectures.
• Familiarity with data pipelines, ETL workflows, and big data platforms.
• .net experience. 
• Understanding of multi-tenant SaaS architectures and compliance requirements (e.g., GDPR, SOC2).
• Prior experience with technical mentoring, code reviews, and engineering process improvements.

Why Five9

At Five9, we believe that technology is only as powerful as the people behind it. You’ll be part of a team that values collaboration, innovation, and accountability, and you’ll have the opportunity to make a meaningful impact on how global enterprises engage with their customers.