• 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

Our Voice division is seeking a Senior DevOps Engineer to lead the automation of voice technology deployments across both on-premise data centers and public cloud environments. This is a high-impact role where you'll help shape the infrastructure that powers critical voice services, supporting both scalability and operational excellence.

Key Responsibilities

• Design, develop, and maintain Infrastructure as Code (IaC) frameworks to automate deployment of voice technologies.
• Own and operate automation pipelines and infrastructure in a distributed, production-grade environment.
• Lead IaC and DevOps best practices, ensuring systems are reliable, scalable, and secure.
• Drive initiatives to modernize and optimize voice platform automation.
• Analyse recurring network or platform incidents and introduce automation to reduce operational risk.
• Deliver clear documentation and handoffs to operational teams to ensure seamless support and transition.
• Provide technical guidance and support to operations and engineering teams when needed.
• Promote a collaborative, agile work culture aligned with continuous delivery and DevOps principles.
• Champion the customer experience by building reliable systems that support Five9's voice infrastructure.

Required Qualifications 

• 5+ years of experience in engineering roles focused on DevOps, operations, or infrastructure preferably within telecom or service provider environments. 
• Proven hands-on experience with automation frameworks such as Ansible and Terraform, including writing and maintaining reusable modules.
• Solid knowledge of AWS and GCP services with experience developing and deploying cloud-native infrastructure components.
• Proficiency in Unix/Linux systems, emphasizing CLI-based administration and shell scripting.
• Experience designing and integrating RESTful APIs and web service workflows.
• Strong background in CI/CD pipelines using GitLab, GitHub Actions, or similar platforms.
• Excellent written and verbal communication skills in English; able to work effectively in distributed, cross-functional teams.

Benefits:

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

Our global voice team is looking for a committed, experienced Senior Software Engineer who is passionate about creating high performing, scalable, and resilient mission critical services that are the foundation of Five9’s next generation contact center platform. You will have the opportunity to combine what you already know with new learnings, crafting a bespoke solution that serves our customers and partners.

Responsibilities:

• Participate in an Agile scrum team which practices DevOps.
• Write clean and well-documented code and tests.
• Deliver your code as part of an overall solution running in the public cloud.
• Develop and enhance our Media Server to support real-time integrations with Large Language Models (LLMs) and other AI services.

Required Skills:

• 5+ years professional experience in software development, with some being written in C and/or C++.
• Hands-on experience writing software for real-time communications signaling and media protocols (SIP, RTP, etc.).
• Ability to methodically troubleshoot complex systems.
• Excellent communication and organization skills, and a sense of ownership.

 Technical Skills:

• Modern C++ (C++17+), RTP/SIP, audio codecs, SIP/SDP, ASR/TTS integration, AI APIs, cloud platforms (AWS/Azure/GCP), CI/CD, containers, SRE principles.

Benefits:

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

Our global voice team is looking for a committed, experienced Senior Software Engineer who is passionate about creating high performing, scalable, and resilient mission critical services that are the foundation of Five9’s next generation contact center platform. You will have the opportunity to combine what you already know with new learnings, crafting a bespoke solution that serves our customers and partners.

Responsibilities:

• Participate in an Agile scrum team which practices DevOps.
• Write clean and well-documented code and tests.
• Deliver your code as part of an overall solution running in the public cloud.
• Develop and enhance our Media Server to support real-time integrations with Large Language Models (LLMs) and other AI services.

Required Skills:

• 3+ years professional experience in software development, with some being written in C and/or C++.
• Ability to methodically troubleshoot complex systems.
• Excellent communication and organization skills, and a sense of ownership.

Preferred Skills:

• Hands-on experience writing software for real-time communications signaling and media protocols (SIP, RTP, etc.).

 Technical Skills:

• Modern C++ (C++17+), RTP/SIP, audio codecs, SIP/SDP, ASR/TTS integration, AI APIs, cloud platforms (AWS/Azure/GCP), CI/CD, containers, SRE principles.

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

In this pivotal role as a Senior Network Engineer, you will join a team of experienced network engineers at the forefront of shaping and expanding the worldwide infrastructure of a dynamic and growing company. Your core mandate will involve implementing and operating cutting-edge enterprise network solutions. Guided by our strategic vision, you will assist in deploying key initiatives in Europe and in other parts of the globe.

Main duties and responsibilities

• Planning, documenting, and performing network changes/extensions.
• Orchestration of firewall rules and underlying network settings.
• Designing and documenting the corporate network architecture (LAN/WAN/WLAN/SECURITY).
• Network security experience and awareness.
• Operating and monitoring of the corporate network infrastructure.
• Providing next level network infrastructure related support.
• Designing network aspects of disaster recovery and operational security.
• Maintaining, auditing, and improving corporate network & security standards.
• Performing network related root cause analysis (RCA) and problem resolution.
• Defining, monitoring, and reporting KPIs for network services/devices.
• Managing proof of concepts, feasibility studies and other corporate initiatives.
• Hands-on experience in SDWAN technology, network design, and implementation preferred.
• Acting as project leader for network related activities/projects.

Reporting and collaboration

• The holder of the position reports directly to Senior Networking management.
• The position requires excellent communications skills along inter-department collaboration.

Profile and education

• Relevant network/IT related education (academic degree preferred).
• Must have or be actively working towards certifications such as CCNP, PCNSA, or PCNSE.
• Excellent understanding of corporate network & data center application architecture concepts.
• Excellent analytic skills.
• Excellent understanding of these technical areas below:
• Security & firewall infrastructure (Palo Alto, Multivendor) - mandatory
• Network infrastructure (Cisco, Arista) - mandatory
• Cloud platforms (AWS, Azure, Google Cloud)
• Wireless network infrastructure (Aruba HPE wireless cloud central)
• VPN technologies/infrastructure
• Network design/management
• Network automation
• Network technologies (Layer1-Layer4)
• Good communication & technical writing skills.
• Good team player.
• Independent, goal-oriented, and self-motivating personality.
• Passion to deliver high quality standard levels.
• Accuracy and high-risk awareness.
• Excellent English language skills (oral & written).
• Willingness to travel and to perform standby on-calls.

Specific skills and knowledge

• Min 5 years of professional experience in senior network engineering roles.
• SolarWinds configuration and management.
• Practical experience in enterprise network & security Plan/Build/Run setup.
• Hands-on experience with Palo Alto firewalls, Arista switches, and Aruba wireless solutions.
• Work experience within an international/multicultural environment preferred.
• Ability to work with teams distributed in different time zones.

Benefits:

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

Key responsibilities 
Strategic Impact

• Drive long-term planning and continuous improvement of observability capabilities
• Identify gaps, initiate improvements, and balance competing priorities
• Enable teams to operate effectively through better tooling, processes, and clarity
• Introduce AI into coding processes

Leadership & Team Development

• Lead, mentor, and grow a team of software engineers ( Python, JavaScript / React)
• Set clear expectations, manage performance, and support career development
• Foster a culture of ownership, accountability and continuous improvement
• Remove blockers and maintain strong team engagement

Planning, Delivery & Requirements

• Lead requirements clarification with stakeholders and translate them into actionable engineering work
• Own and maintain application and platform roadmaps, aligning with organizational priorities
• Define, prioritize, and manage Jira epics, stories, and tasks
• Drive sprint planning, backlog management, and predictable delivery
• Ensure high-quality execution through effective Agile practices and CI/CD workflows

Cross-functional Leadership

• Collaborate with SRE, platform teams and service owners to design scalable solutions
• Act as a key coordination point between engineering, operations, and leadership
• Align observability initiatives with broader company goals

Engineering Contribution

• Contribute to code and perform code reviews
• Provide technical guidance and support architectural decisions
• Ensure engineering best practices across the team

Requirements

• 7+ years of experience in Software Development
• 3+ years experience in leading and mentoring software engineers as senior or lead developer
• Strong expertise in Observability (monitoring / logging / telemetry) tooling
• Experience with distributed systems and scalable architectures
• Proven ability to translate requirements into actionable engineering work
• Experience with Agile methodologies and delivery management
• Strong communication and stakeholder management skills
• Experience with AI development

Benefits:

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

• Experience with contact centers, VoIP, or telecommunications.
• Familiarity with building and managing multi-tenant systems.
• Experience with Kubernetes and modern CI/CD pipelines.

• AI and Product leadership.
• Engineering and architecture teams.
• Technical leadership and senior management.
• Compliance and Information Security teams.

Benefits:

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

We are seeking a collaborative, systems-thinking Information Architect to help lead the transformation of our technical content ecosystem within the Product Content & Operations team. This role owns the structure and quality of the customer-facing help content, driving improvements to how content is organized, authored, and maintained across the product experience.

In this role, you will partner closely with Support, Marketing, and Product— to improve the quality and scalability of our help content, driving alignment on content types, templates, taxonomy, and terminology. This role combines hands-on content development with information architecture practices to improve customer experience, support outcomes, and product adoption.

Responsibilities

• Lead the design and implementation of information architecture within Five9’s Product Content team.
• Define and maintain departmental content models, including information types and reusable components.
• Establish structured templates for key information types (How-To, Concept, Reference, Troubleshooting, etc.).
• Develop and manage taxonomy and metadata structures that improve navigation and findability.
• Collaborate with cross-functional teams to identify alignment opportunities and reduce content divergence.
• Conduct audits and user research to identify gaps, redundancies, and structural improvements.
• Guide writers on adopting structured content templates and IA best practices.
• Lead modernization and restructuring efforts for legacy documentation.
• Influence the evolution of search and tagging strategies across the department.
• Serve as a mentor and IA subject matter expert within the writing team.

Qualifications

• 5+ years in Information Architecture, Content Design, UX Writing, Technical Writing, or related roles.
• Experience creating content models, taxonomy systems, and structured authoring frameworks.
• Experience leading IA initiatives within a documentation or product content environment.
• CMS, CCMS, or knowledge systems (MadCap, Zoomin, Paligo, AEM, ServiceNow, Confluence)
• Strong skills in facilitation, collaboration, and stakeholder influence.
• Experience analyzing and modernizing legacy content at scale.
• Experience preparing content for AI-driven systems (e.g., search optimization, metadata design, or content chunking for RAG/LLM pipelines).
• Bachelor’s with approximately 12 years of professional experience or a Masters degree with approximately 8 years of professional

This is a high-impact role where you’ll establish the core systems, models, and frameworks that enable scalable, consistent, high-quality content across the Product Content team. You will shape the foundation that improves customer experience, support outcomes, and product adoption for years to come, while gaining visibility and influence across multiple content-generating groups

Benefits:

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

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

• 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

About the Role 

We are looking for a Senior .NET Developer who combines deep technical expertise with a passion for code quality, mentorship, and collaborative delivery. In this role you will lead efforts to modernize and evolve our platform, drive engineering best practices, and work alongside product, design, and data teams to ship reliable software at scale.

You bring a proven track record in .NET development, a sharp understanding of modern deployment pipelines, and the architectural awareness to build systems that scale across tenancy models and data workloads.  

Core Responsibilities 

Technical Leadership & Code Modernization 

• Lead architectural decisions for migrating a legacy single tenant .NET 8 application into an existing multitenant framework. 
• Champion clean code principles and drive technical roadmaps that reduce technical debt while maintaining delivery velocity. 
• Evaluate and introduce tooling, libraries, and frameworks that improve developer experience and system reliability. 
• Mentor junior and mid-level engineers through pairing, design reviews, and structured knowledge-sharing sessions. 

Code Review & Quality Assurance 

• Conduct constructive code reviews that uphold team standards and serve as teaching opportunities. 
• Define and enforce coding standards, naming conventions, and architectural guidelines across the team. 
• Identify systemic quality issues through review patterns and proactively propose process improvements. 
• Act as a trusted technical reviewer for high-risk or cross-cutting changes before they reach production. 

Cross-Functional Collaboration 

• Partner closely with stakeholders to translate business requirements into accurate technical estimates and clear implementation plans. 
• Collaborate with data engineers on warehouse integrations and backend data pipelines, ensuring scalable and maintainable interfaces. 
• Work with DevOps and platform teams to define deployment patterns and promote infrastructure-as-code practices. 
• Facilitate cross-team alignment through clear written communication, architectural decision records (ADRs), and documentation. 

Quality Engineering & Testing with TDD 

• Apply test-driven development (TDD) as a core engineering discipline, writing unit, integration, and contract tests before implementation. 
• Design and maintain test suites that give the team confidence to refactor and deploy frequently. 
• Champion a shift-left testing culture by embedding quality practices into every stage of development, not just QA cycles. 
• Ensure test coverage benchmarks are defined, tracked, and continuously improved. 

Communication & Process Leadership 

• Lead sprint ceremonies including planning, retrospectives, and backlog grooming with clarity and accountability. 
• Produce high-quality technical documentation including runbooks, API contracts, and onboarding guides. 
• Surface blockers and dependencies early, communicating status and risk proactively to stakeholders. 
• Contribute to a culture of psychological safety where candid, constructive feedback is the norm. 

Required Qualifications 

• 5+ years of professional software development experience with a focus on .NET. 
• .NET proficiency, including ASP.NET Core, Entity Framework Core, and the modern .NET runtime ecosystem. 
• Demonstrated experience modernizing legacy web applications — refactoring, re-architecting, or re-platforming from older monolithic web applications to modern platform fabrics. 
• Solid understanding of CI/CD pipelines, including pipeline design, automated test gating, artifact management, and deployment strategies (blue/green, canary, rolling). 
• Clear understanding of single-tenancy vs. multi-tenancy architecture patterns and the trade-offs in security, isolation, scalability, and cost. 
• Experience with test-driven development and a strong testing philosophy covering unit, integration, and end-to-end coverage. 
• Strong written and verbal communication skills; able to write clear technical documentation and lead design discussions. 

Preferred Qualifications 

• Claude code, Copilot, or the leverage of any AI platform to increase production output is a strong plus. 
• Experience with large-scale data warehousing solutions; Google BigQuery experience is a strong plus. 
• Frontend experience with Vue.js 3 — component architecture, Composition API, and state management patterns. 
• Familiarity with observability tooling such as OpenTelemetry, Prometheus, Datadog, or similar. 
• Experience working in a platform or multi-product engineering environment. 

Benefits:

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