To complement our rapid growth, we are actively sourcing for an experienced Senior Telecom Engineer to join our cloud operations organization on a full-time basis. The ideal candidate is someone who has worked in a 24/7 production support environment and has a strong working knowledge of VoIP, SIP, and RTP.
This position is based anywhere in the UK.

Key Responsibilities

• Interface directly with customer’s telecom engineers and IT teams to deploy customized solutions and trouble shoot issues;
• Assist int the day-to-day operational support of the Telecommunications network, analyzing problems affecting network availability and customer quality reports;
• Escalation point of contact for the Network Operations Center to resolve critical alerts generated by the SBC’s Analyze history of telecommunication related incidents and perform preventive measures;
• Assist in the day-to-day operation of the telecommunications network, where necessary analyzing problems affecting network availability and customer/vendor service quality;
• Provide root-cause analyses on service outages;
• Respond to Telecom alerts and alarms and provide corrective actions in coordination with the Network Operations Center;
• Create technical documentation and call flow drawings as needed Manage Telecommunications Service Provider & Vendors Implement hardware and software deployments on the telephony network as required;
• Deploy new services including interop testing with telecom carriers and customers;
• Provide emergency assistance and technical recovery in the event of an emergency situation affecting the availability and/or service quality of the network;
• Participate in on-call emergency rotation.

Requirements

• 3-5 years of telecom engineer experience with VoIP/SIP voice applications.
• Must have a detailed, working and theoretical knowledge of voice and data communications, including traditional switching, signaling and routing systems to include SIP, TCP/IP, MPLS etc.
• Experience with ribbon SBCs and PSX.
• Working knowledge of VoIP principles, protocols and CODECs such as H.248, SIP, G.711, G.729, WebRTC, MPLS, VPN, UDP, RTP, MTP etc.
• Knowledge of SIP call routing, Least Cost Routing, Security Controls (TLS, IPSEC, ACLs) with Session Border Controllers.
• Knowledge of telecom principals and terminology including DIDs, Toll Free numbers, LATA OCN and NPA-NXX etc.
• Experience with International Routing including ITFS, iDID’s and local termination policies Ability to build, interop and maintain direct connect SIP Trunks to customers and carriers.
• Review, Assess, Critique and Implement Telecom Architecture design changes in Lab and Production environments.
• Excellent organizational and follow-through skill sets are essential.
• Ability to document, troubleshoot and resolve a multifaceted and complex Global voice network.
• Maintain the telephony environment to assure delivery of Cloud applications, voice and customer connectivity and availability to target 99.99% SLA.
• Experience with Softswitch, Session Border Controllers (preferably Sonus/Ribbon, Audio Codes), SIP proxies, Media Servers (preferably AudioCodes IPM-6310 and FreeSWITCH).
• In depth knowledge of Wireshark, Empirix or other network protocol analyzers Ability to capture and analyze RTP streams as related to voice quality traditional KPI’s such as MOS, Jitter, Latency, Packets Loss.
• Ability to execute and use intermediate level Linux/Unix system administrator commands.
• Excellent working knowledge of telecommunications, maintenance processes and systems.
• Proven ability to resolve complex issues in an efficient and timely manner and provide clients with consultative explanations and advice.
• Self-starter with excellent troubleshooting skills and ability to prioritize tasks and organize workflow accordingly.
• Excellent verbal and written communication skills are required Excellent documentation skills are required.

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

Key Responsibilities:

• Develop and implement governance strategies, policies, frameworks, and procedures in a multi-cloud environment (GCP, AWS, Azure) to standardize business operations and ensure compliance with regulatory requirements and regulations (SOC 2, HIPAA, GDPR, FedRAMP)

• Work with security teams to effectively enforce Identity and Access Management (IAM) policies and network security best practices across the organization

• Develop and maintain dashboards that would track cloud governance metrics such as security posture, timely key rotation, and compliance

• Collaborate with diverse stakeholders to identify service level objectives (SLOs), key performance indicators (KPIs), and metrics for measuring operational efficiency and compliance

• Work closely with IT, Finance, Security, DevOps, Cloud Architects, and Product Engineering development teams to maintain consistent governance controls across all environments

* This position is based out of one of the offices of our affiliate Acqueon Technologies in India, and will adopt the hybrid work arrangements of that location. You will be a member of the Acqueon team with responsibilities supporting Five9 products, collaborating with global teammates based primarily in the United States.

Requirements:

• 3+ years of working in cloud environment (experience with GCP is highly preferred)

• 3+ years of working with modern public cloud services such as EC2, VPC, S3/GCS, IAM, and AWS/GCP CLI

• Hands-on experience with cloud security controls, identity and access management (IAM), network security, encryption, and data protection tools such as GCP Organization Policy, AWS Config, or Azure Policy

• Proficiency in CI/CD programming, scripting (e.g., Python, PowerShell) and automation tools (e.g., Ansible) for cloud governance and infrastructure management

• Knowledge of automation principles and Infrastructure-as-Code (IaC) tools such as Terraform, AWS CloudFormation, or Azure Resource Manager (ARM)

• Experience establishing and maintaining strong working relationships with a wide variety of business groups (Development, Product, Network Engineering, Voice Engineer, Security, etc.) and being able to translate technical information into business-friendly language

Preferred Qualifications:

• Bachelor’s degree in Computer Science, Engineering, or other relevant technical field

• Knowledge of Kubernetes best practices

• Experience with Microsoft Active Directory Federation Services (ADFS)

• Experience with Okta integration

• Result orientated, self-starter

• AWS certified

• GCP certified

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

Join us in bringing joy to customer experience. Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide.

Living our values every day results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves.

Our Global Voice Team is looking for a committed, experienced Software Engineer II who is passionate about creating high-performing, scalable, and resilient mission-critical services that form the foundation of Five9’s next-generation contact center platform. You will have the opportunity to combine your existing expertise with new learnings, crafting bespoke solutions that serve our customers and partners.

Responsibilities:

• Participate in an Agile Scrum team that practices DevOps.
• Write clean, well-documented code and corresponding 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 of professional experience in software development, including experience in C and/or C++.
• Hands-on experience developing software for real-time communications signaling and media protocols (e.g., SIP, RTP).
• Ability to methodically troubleshoot complex systems.
• Excellent communication and organizational skills, with a strong 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
• Site Reliability Engineering (SRE) principles
• AI/ML and Large Language Models (LLMs)

Join us in bringing joy to customer experience. Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide.

Living our values every day results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves.

Our Global Voice Team is looking for a committed, experienced Software Engineer II who is passionate about creating high-performing, scalable, and resilient mission-critical services that form the foundation of Five9’s next-generation contact center platform. You will have the opportunity to combine your existing expertise with new learnings, crafting bespoke solutions that serve our customers and partners.

Responsibilities:

• Participate in an Agile Scrum team that practices DevOps.
• Write clean, well-documented code and corresponding 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 of professional experience in software development, including experience in C and/or C++.
• Hands-on experience developing software for real-time communications signaling and media protocols (e.g., SIP, RTP).
• Ability to methodically troubleshoot complex systems.
• Excellent communication and organizational skills, with a strong 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
• Site Reliability Engineering (SRE) principles
• AI/ML and Large Language Models (LLMs)

Join us in bringing joy to customer experience. Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide.

Living our values every day results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves.

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.

Key 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 of 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 organizational skills, along with a strong 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
• AI/ML, LLMs

Join us in bringing joy to customer experience. Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide.

Living our values every day results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves.

Our Global Voice Team is looking for a committed, experienced Software Engineer II who is passionate about creating high-performing, scalable, and resilient mission-critical services that form the foundation of Five9’s next-generation contact center platform. You will have the opportunity to combine your existing expertise with new learnings, crafting bespoke solutions that serve our customers and partners.

Responsibilities:

• Participate in an Agile Scrum team that practices DevOps.
• Write clean, well-documented code and corresponding 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 of professional experience in software development, including experience in C and/or C++.
• Hands-on experience developing software for real-time communications signaling and media protocols (e.g., SIP, RTP).
• Ability to methodically troubleshoot complex systems.
• Excellent communication and organizational skills, with a strong 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
• Site Reliability Engineering (SRE) principles
• AI/ML and Large Language Models (LLMs)

Traffic Management Specialist

Five9 is a leading provider of cloud software for the enterprise contact center market, bringing the power of the cloud to thousands of customers and facilitating more than three billion customer interactions annually. Since 2001, Five9 has led the cloud revolution in contact centers, helping organizations transition from legacy premise-based solutions to the cloud. Five9 provides businesses with cloud contact center software that is reliable, secure, compliant and scalable, which is designed to create exceptional customer experiences, increase agent productivity and deliver tangible business results.

We are actively seeking a Traffic Management Specialist to join our Carrier Relations team. This person’s responsibilities are centered around traffic management for voice traffic traversing the Five9 network such as monitoring, reporting, augmenting and maintaining carrier call traffic to ensure high levels of quality and reliability coupled with efficient cost margins.

Key Responsibilities:

• Ensures traffic is meeting expected routes through reporting and troubleshooting, takes corrective actions when necessary
• Provide carrier traffic forecasts with regular cadence
• Provide target rate profiles with an established reoccurring cadence to drive competitive pricing
• Process and load updated rate decks for optimal routing
• Monitors and reports on carrier traffic capacity and performance metrics
• Works with vendors on escalation of problems, status updates or performance issues found in monitoring and reporting
• Participates in carrier routing issues such as the removal of a carrier due to network trouble, calculating the cost and impact associated to the event, facilitating the process while mitigating the risk of restoring the carrier to routes
• Works with business partners to understand problem impact, as well as, support project and work requests
• Works with internal groups such as operations, capacity, provisioning to align projects, work- flow processes and metrics report validation

Requirements:

• 3+ years of telecom experience
• Excellent knowledge of telecom principals and terminology including DIDs, Toll Free numbers, LATA OCN and NPA-NXX etc.
• Knowledge of SIP call routing, Least Cost Routing with Session Border Controllers
• Experience with International Routing including ITFS and iDID’s
• Ability understand capacity requirements as it relates to carriers
• Troubleshoot and resolve persistent problems and escalated issues
• Respond to alerts and alarms troubleshooting and correcting problems coordinating issues with the Network Operations Center
• Self-starter with excellent troubleshooting skills and ability to prioritize tasks and organize workflow accordingly
• Excellent documentation, verbal and written communication skills are required
  
  

Company Benefits

• Company stocks
• Annual merit increase based on performance
• 15% night shift differential pay
• Paid Leave with Cash Conversion
• HMO with free dependents
• Retirement Plan
• Life Insurance
• While on work from home setup: Internet and meal allowance are provided
• Employee Assistance Program for mental and social well-being
• Government-mandated Benefits (SSS, PhilHealth, PagIBIG, 13^th month pay, Solo parent leave, Special leave for women)

We are expanding our engineering team in India (Bangalore) and are seeking a Staff Software Engineer to help design, implement, and scale Five9’s next-generation cloud-native services. This role is ideal for engineers who thrive on hands-on coding, technical depth, and building complex distributed systems.

Role Overview

As a Staff Engineer at Five9, you will work on core backend services that power our global cloud contact center platform. You’ll have the opportunity to tackle hard engineering problems 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 along the way.

Key Responsibilities

• 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

Qualifications & Skills

• Strong debugging and problem-solving skills, with an 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 or Spring Boot
• Proven ability to build and operate distributed, cloud-native microservices at scale
• Strong experience with GCP services (e.g., 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 Archietecture

Preferred Skills (Nice to have)

• Exposure to voice and telephony systems (SIP, RTP, IVR, call routing) or real-time communication platforms
• Experience in latency-sensitive, high-throughput systems
• Familiarity with Looker, analytics pipelines, and large-scale reporting systems
• Familiarity with Agile, Jira, Confluence, E2E test, etc

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
• Hardware: Apple MacBook options available

• 7+ years in infrastructure, platform, or SRE engineering roles.
• Certified Kubernetes Administrator (CKA)
• Hands-on mastery of both OpenStack and Rancher Kubernetes in production, with focus on automation, lifecycle management, and high availability.
• Proficiency with Terraform, Ansible, Helm, Argo CD, and scripting in Python/Go/Bash.
• Deep understanding of Linux internals and system performance.
• Proven application of SRE practices in high-stakes, always-on environments.
• Strong experience with observability platforms (Prometheus, Grafana, Loki/ELK/EFK).

We are seeking a highly motivated technical leader to guide the Network Engineering and Operations team in delivering scalable, automated, and cloud-ready networking solutions while fostering a culture of continuous improvement. 

Key Responsibilities:

• Partner with cross-functional stakeholders to design and deliver next-generation data center fabric architectures, leveraging technologies such as VXLAN, Cisco Nexus Dashboard, Kubernetes, and AI/ML-enabled networking.
• Provide technical leadership and mentorship to a team of engineers, strengthening troubleshooting capabilities, operational rigor, and adoption of network engineering best practices.
• Drive automation strategy and execution using Ansible, Terraform, and CI/CD pipelines, including the design, deployment, and continuous improvement of automation for high-impact operational and reliability use cases.
• Own and support all operational aspects of network security infrastructure, including operating system maintenance, vulnerability management, capacity planning, lifecycle management, and certificate administration.
• Track and manage projects, processes, and technology initiatives across the team, ensuring alignment, visibility, and timely execution.
• Analyze historical network incidents to identify systemic issues, perform root cause analysis, and implement automated remediation to prevent recurrence.
• Lead the review, analysis, and execution of network change requests within the data center fabric domain, ensuring adherence to change management and risk mitigation standards.
• Develop and report operational and performance metrics using observability platforms such as Prometheus, Grafana, and ELK to drive data-informed decisions.
• Manage and operate data center fabric services across hybrid and multi-cloud environments, including on-premises infrastructure, Google Cloud Platform (GCP), and Amazon Web Services (AWS).
• Participate in incident response activities, providing technical leadership during outages and leading post-incident root cause analysis and corrective action planning.
• Foster a culture of continuous improvement by enabling team members to proactively enhance processes, tooling, and operational maturity.
• Lead the introduction of new processes and automation capabilities that improve scalability, reliability, and operational efficiency.
• Maintain strong operational focus on data center fabric technologies while coordinating cross-team efforts with network security and load balancing functions to ensure end-to-end service reliability.

Requirements:

• Bachelor's degree in computer science or a related technical field preferred, or equivalent practical experience.
• Proven technical expertise in fast-paced, dynamic, production environments supporting mission-critical infrastructure.
• Extensive hands-on experience and advanced troubleshooting capabilities with data center fabric and software-defined networking (SDN) technologies, including VXLAN, NX-OS, OpenStack Neutron, Calico (Kubernetes), and enterprise routing and switching.
• 8+ years of experience in technology roles, including 3+ years serving as a technical subject matter expert.
• Strong understanding of, with hands-on experience with dynamic routing protocols, particularly BGP.
• Demonstrated experience developing root cause analyses and implementing error prevention and corrective action procedures.
• Experience defining, measuring, and reporting site reliability using SLI/SLO metrics.
• Proven experience designing, implementing, or operating large-scale data centers and complex infrastructure environments.
• Hands-on knowledge and operational experience with Cisco Nexus, F5, and Palo Alto platforms.
• Experience managing and operating public cloud networking environments; Google Cloud Platform (GCP) and AWS experience preferred.
• Strong experience with incident response, change management, and operational governance practices.
• Demonstrated project management skills with the ability to manage multiple initiatives in parallel.
• Excellent communication skills, with the ability to clearly represent technical domains and team outcomes to senior leadership.
• Proven experience automating infrastructure processes and deployments.
• Demonstrated ability to drive and scale a culture of automation across engineering and operations teams.

We are seeking a highly experienced Senior Cloud Infrastructure Engineer to design, implement, and support Software Defined Storage (SDS) and Kubernetes platforms in a private cloud environment. This role focuses on scalability, resilience, automation, and performance using Infrastructure-as-Code and GitOps practices.

This is a deeply technical role requiring expert-level understanding of Software Defined Storage, Kubernetes and extensive working knowledge on Linux Operating systems. You will also collaborate with platform and SRE teams to maintain secure, performant, and multi-tenant-isolated services that serve high-throughput, mission-critical applications. 

Key Responsibilities:

• Design, implement, and operate large-scale Software Defined Storage architectures across private and public cloud regions.
• Deploy and support enterprise storage platforms (Pure Storage, HPE, NetApp) and SDS solutions (Ceph, Longhorn).
• Build and operate multi-tenant Kubernetes clusters on bare metal using SDS-backed storage.
• Develop Infrastructure-as-Code using Ansible, Terraform or Pulumi, with Python/Bash automation.
• Implement CI/CD pipelines for infrastructure updates, patching, upgrades, testing, and rollback.
• Build observability, alerting, and auto-remediation using GitOps and tools such as Prometheus, Loki, and Grafana.
• Architect and maintain high availability, disaster recovery, and scale-out infrastructure.
• Perform deep troubleshooting across storage, Kubernetes, hypervisors, networking, and Linux systems.
• Participate in on-call rotations, incident response, and root cause analysis.
• Collaborate globally on change management, documentation, and operational best practices.

Requirements:

• 6+ years of experience managing enterprise storage and Kubernetes platforms on Linux.
• Strong hands-on experience with SDS solutions (Ceph, Longhorn) and storage migrations from legacy systems.
• Experience with block, file, and object storage, including Fibre Channel and IP-based protocols.
• Expert knowledge of Kubernetes and Linux systems (Ubuntu, RHEL/CentOS).
• Proficiency with Infrastructure-as-Code (Ansible, Terraform, or Pulumi).
• Strong scripting skills in Python, Bash, or Go.
• Deep experience with enterprise DNS (Infoblox DDI, BIND, cloud DNS platforms).
• Experience operating 24x7 mission-critical production environments.
• Hands-on experience with hypervisors (vSphere and/or KVM).
• Strong written and verbal communication skills.
• Proficiency with Git, CI/CD pipelines, and automated testing frameworks
• Ability to write technical documentation and contribute to community wikis or knowledge bases. 
• Bachelor’s degree in computer science or equivalent professional experience.

Preferred Qualifications 

• Good understanding of overall Enterprise Common Infrastructure service implementations with a focus on SDS & Kubernetes. 
• Understanding of security best practices for system patching and security compliance (e.g., CIS, NIST). 
• Background in telco, edge cloud, or large enterprise infrastructure environments. 
• Bachelor’s degree in computer science, IT, Engineering, or a related field preferred; equivalent experience and relevant industry certifications will also be considered. 

What You’ll Get 

• A collaborative team that’s deeply invested in infrastructure excellence. 
• Complex technical challenges that require creative, scalable solutions. 
• The opportunity to shape a next-generation private cloud platform-built reliability. 
• Access to the latest tools, frameworks, and upstream project developments. 

Skills and Attributes: 

• Analytical Thinking & Problem Solving: Demonstrated ability to translate complex, cross-domain requirements into scalable and resilient cloud infrastructure and automation solutions. 
• Collaboration & Teamwork: Strong interpersonal and communication skills with a proven track record of effective collaboration across multidisciplinary teams, including developers, operations, security, and product stakeholders. 
• Mentorship & Leadership: Passionate about knowledge-sharing and mentorship, with experience guiding junior engineers and fostering a team culture of continuous learning, innovation, and technical excellence in cloud engineering and DevOps practices. 

Team

The Devops Engineer would be an active member within the Voice Application Services team, responsible for providing automation and test support for the SW releases of Five9.

Key Responsibilities

• Design, implement, and maintain infrastructure as code using tools like Ansible and Terraform
• Build and manage scalable cloud infrastructure on AWS and GCP
• Develop and maintain CI/CD pipelines using platforms such as GitLab CI/CD, or similar
• Automate deployment, monitoring, and operational workflows across distributed systems
• Collaborate with Development, QA, and Operations teams to ensure seamless delivery and high system reliability
• Monitor system performance, troubleshoot issues, and implement solutions to improve availability and scalability
• Develop and maintain reusable automation modules and frameworks
• Identify inefficiencies in existing processes and drive improvements in automation and operational workflows
• Work with REST APIs and integrate services across systems and platforms
• Leverage AI-assisted coding tools such as Claude Code or GitHub Copilot to improve productivity and code quality
• Support and manage voice infrastructure components, including protocols such as SIP (Session Initiation Protocol) and RTP (Real-time Transport Protocol)

Qualifications & Skills

• 3+ years of experience in DevOps, SRE, or infrastructure engineering roles (preferably in telecom, SaaS, or service provider environments)
• Hands-on experience with Ansible and Terraform, including writing and maintaining reusable modules
• Strong experience with cloud platforms such as AWS and GCP
• Proficiency in Unix/Linux systems, including CLI-based administration and shell scripting
• Solid understanding of CI/CD pipelines (GitLab, or similar)
• Demonstrated understanding of AI-assisted development tools (e.g., Claude Code, GitHub Copilot)
• Familiarity with voice technologies and protocols such as SIP and RTP
• Strong troubleshooting, debugging, and problem-solving skills
• Excellent written and verbal communication skills in English
• Ability to work effectively in distributed, cross-functional teams

Team

The Devops Engineer would be an active member within the Voice Application Services team, responsible for providing automation and test support for the SW releases of Five9.

Key Responsibilities

• Design, implement, and maintain infrastructure as code using tools like Ansible and Terraform
• Build and manage scalable cloud infrastructure on AWS and GCP
• Develop and maintain CI/CD pipelines using platforms such as GitLab CI/CD, or similar
• Automate deployment, monitoring, and operational workflows across distributed systems
• Collaborate with Development, QA, and Operations teams to ensure seamless delivery and high system reliability
• Monitor system performance, troubleshoot issues, and implement solutions to improve availability and scalability
• Develop and maintain reusable automation modules and frameworks
• Identify inefficiencies in existing processes and drive improvements in automation and operational workflows
• Work with REST APIs and integrate services across systems and platforms
• Leverage AI-assisted coding tools such as Claude Code or GitHub Copilot to improve productivity and code quality
• Support and manage voice infrastructure components, including protocols such as SIP (Session Initiation Protocol) and RTP (Real-time Transport Protocol)

Qualifications & Skills

• 3+ years of experience in DevOps, SRE, or infrastructure engineering roles (preferably in telecom, SaaS, or service provider environments)
• Hands-on experience with Ansible and Terraform, including writing and maintaining reusable modules
• Strong experience with cloud platforms such as AWS and GCP
• Proficiency in Unix/Linux systems, including CLI-based administration and shell scripting
• Solid understanding of CI/CD pipelines (GitLab, or similar)
• Demonstrated understanding of AI-assisted development tools (e.g., Claude Code, GitHub Copilot)
• Familiarity with voice technologies and protocols such as SIP and RTP
• Strong troubleshooting, debugging, and problem-solving skills
• Excellent written and verbal communication skills in English
• Ability to work effectively in distributed, cross-functional teams

About the Role

We are looking for a Senior Staff Engineer, AI Voice Engineering, who will be responsible for the software architecture and software development of Five9’s AI Agent voice orchestration software platform. This platform handles real-time streaming voice, including RTP/SIP, integration with speech recognition engines, speech synthesis engines, end of turn model execution and interruption model inference.

As a senior individual contributor, you’ll not only be one of the most senior developers on the team, you’ll also mentor junior engineers and set technology direction for platform. You’ll work with other teams, collaborating cross-functionally to make sure complete solutions are delivered. You’ll make some of the most important technology decisions and be in the driver’s seat for the platform evolution. You’ll also get your hands dirty working direcdtly on the software, diagnosing issues, and helping uplevel the team to reach the highest levels of performance. Your responsibility extends through deployment and operations (we practice devops), and you will ensure the software platform is low latency, scalable, reliable, observable and maintainable by Five9.

What You’ll Do

• Lead architecture and development of real-time AI voice systems
• Design and optimize low-latency voice pipelines using RTP/SIP
• Integrate ASR, TTS, and AI inference services
• Mentor engineers and lead technical best practices
• Collaborate with Product, AI, Infrastructure, and SRE teams
• Own the full lifecycle: design, development, deployment, and operations
• Ensure scalability, reliability, and observability

Required Qualifications

• 10+ years of overall software development experience
• 5+ years building real-time voice systems in C++
• 1+ year experience with real-time GenAI voice platforms
• Bachelor’s or higher degree in Computer Science or related field

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

Leadership & Impact

Lead architecture for mission-critical systems
Mentor engineers and influence platform-wide decisions
Balance latency, quality, cost, and reliability trade-offs

The Telecom Engineer I is a specialized engineering professional responsible for building, testing, and maintaining the voice solutions that power the customer voice integrations and Five9 cloud contact center platform.

Key Responsibilities

A Five9 Telecom Engineer I focuses on the customer facing voice SIP trunk builds, architecture and operation of real-time communication systems, which includes: 

• Developing high-quality, reliable, and high-performing voice applications across various platforms (desktop, web).
• Working with key technologies such as SIP, MPLS and VPN.
• Designing and optimizing low-latency voice pipelines and handling real-time streaming voice (RTP/SIP).
• Troubleshooting and resolving complex issues within the global voice platform.
• Collaborating with cross-functional teams (Product Managers, Global Solution Architects and Connectivity PMs) to deliver a seamless customer experience.
• Ensuring the platform is scalable, reliable, observable, and maintainable, following DevOps practices.
• Mentoring and training junior team members. 

Required Skills and Qualifications

Typical requirements for a voice engineering role at Five9 include: 

• Experience: 5+ years of industry experience in software development and troubleshooting VoIP systems.
• Technical Expertise: Expert-level knowledge of SIP call flows, routing algorithms, and carrier interoperability. Strong hands-on experience with real-time voice systems in C++, Java, or JavaScript. Ribbon SBC (5k, 7k, SWe), GSX (9000)
• Networking Knowledge: Deep understanding of telecommunication protocols (SIP, RTP, WebRTC).
• Problem-Solving: Strong debugging skills and experience with audio media analysis and troubleshooting tools like SIPp.
• Methodology: Experience working within Agile/Scrum teams. 

Company Benefits

• Company stocks
• Annual merit increase based on performance
• 15% night shift differential pay
• Paid Leave with Cash Conversion
• HMO with free dependents
• Retirement Plan
• Life Insurance
• While on work from home setup: Internet and meal allowance are provided
• Employee Assistance Program for mental and social well-being
• Government-mandated Benefits (SSS, PhilHealth, PagIBIG, 13^th month pay, Solo parent leave, Special leave for women)

Five9 is a dynamic growing company is seeking to hire a Telecom Connectivity Project Manager. This role involves monitoring customer connectivity project plans, coordinating and scheduling calls with internal and customer resources, work hour budgets, and organizing and participating in stakeholder meetings, and ensuring that project deadlines are met in a timely manner.

To be successful as a Telecom Connectivity Project Manager, you will need to be able to work on tight deadlines, be competent in SIP trunking and SIP standards. The primary role is to assist customers in building SIP trunks and dedicated connections by coordinating with Five9 Voice Deliver and Network Architecture teams, opening Jira tickets for those teams and managing the life cycle of implementation from start to completion of successful calls to and from Five9. 

Primary Responsibilities

• Manage all day-to-day operational and tactical aspects of multiple Implementation projects.
• Creating Project Plans.
• Elicit and define project timelines working with Program Manager and customer for go-lives.
• Effectively communicate plans, progress and status/updates to both internal staff and customer stakeholders.
• Articulate the value of Five9’s Professional Services through open discussion with customers and internal teams.
• Continually seek opportunities to increase customer satisfaction and deepen client relationships by interacting effectively at all levels of the client organization.
• Develop materials in-line with the specific Sales and/or Services opportunity requirements.
• Documenting and following up on important actions and decisions from meetings.
• Preparing necessary presentation materials for customer meetings. Primarily guiding customers through a Five SIP and MPLS workbook to collect required information for implementation of services.
• Undertaking project tasks as required.
• Ensuring projects adhere to frameworks and all documentation is maintained appropriately for each project in PSA Tool and Salesforce.
• Assess project risks and issues and provide solutions where applicable.
• Ensure stakeholder views are managed towards the best solution.
• Coordinate and facilitate meetings, action items and assign tasks and accountability to project and internal resources as required.
• New project engagement on internal kickoff and gather project resources for the Program Manager as required.

Requirements

• Relevant experience of at least 3 years is preferred for consideration.
• Work history with SIP-based routing, including PBXs, SBCs, and call routing.
• Understanding of CCaaS networking and call routing.
• Project management using Salesforce and Jira.
• Customer facing communication skills.
• Job history in telephony and VoIP. DID provisioning and call routes.
• Strong verbal communications skills for customer facing and internal correspondence.