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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.
- 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
- 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
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 & ImpactLead architecture for mission-critical systems
Mentor engineers and influence platform-wide decisions
Balance latency, quality, cost, and reliability trade-offs
Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills. The more inclusive we are, the better we are. Five9 is an equal opportunity employer.
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Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.
Skills Required
- 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
- Modern C++ (C++17+)
- RTP/SIP and SIP/SDP expertise
- Knowledge of audio codecs
- ASR and TTS integration experience
- Familiarity with AI APIs and inference integration
- Experience with cloud platforms (AWS/Azure/GCP)
- CI/CD and container experience
- Understanding and application of SRE principles
Five9 Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Five9 and has not been reviewed or approved by Five9.
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Healthcare Strength — Employer-paid employee premiums, multiple plan options, and broad coverage across medical, dental, vision, disability, FSAs, and EAP are emphasized as core elements of the package. These features position healthcare as a standout component of total rewards.
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Equity Value & Accessibility — Equity grants and an ESPP are highlighted as meaningful parts of total compensation. Feedback suggests these stock components can materially enhance overall pay when company performance is favorable.
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Fair & Transparent Compensation — Public job postings include salary ranges and company materials describe formal peer benchmarking of pay. These practices indicate structure and visibility around compensation decisions.
Five9 Insights
What We Do
Five9 is an industry-leading provider of cloud contact center solutions, bringing the power of cloud innovation to more than 2,000 customers worldwide and facilitating billions of customer engagements annually. The Five9 Intelligent Cloud Contact Center provides digital engagement, analytics, workflow automation, workforce optimization, and practical AI to help customers reimagine their customer experience. Designed to be reliable, secure, compliant, and scalable, the Five9 platform helps increase agent and supervisor productivity, connects the contact center to the business, and ultimately deliver tangible business results including increased revenue and enhanced customer trust and loyalty
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