Software Engineer II – C++ & SIP

About the role

Our Global Voice Team is looking for a committed, experienced Software Engineer II who is passionate about building high‑performing, scalable, and resilient mission‑critical services that power Five9’s next‑generation contact‑center platform. You will combine your expertise in C++ and real‑time communications with new learnings in AI and cloud technologies.

Key responsibilities

• Participate in an Agile Scrum team that practices DevOps.
• Write clean, well‑documented code and corresponding tests.
• Deliver 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 profile

• 3+ years of professional software development experience, including C and/or C++.
• Hands‑on experience with real‑time communications signaling and media protocols such as SIP and RTP.
• Ability to methodically troubleshoot complex systems.
• Strong communication, organizational skills, and a sense of ownership.

Required skills

• Modern C++ (C++17+).
• RTP/SIP, audio codecs, SIP/SDP.
• ASR/TTS integration.
• AI APIs and Large Language Model (LLM) integration.
• Cloud platforms (AWS, Azure, GCP).
• CI/CD pipelines.
• Containers.
• Site Reliability Engineering (SRE) principles.