Phonely
Senior Backend Engineer
$200K–$350K
San Francisco, California · On-site · Senior · Full-time · Posted Apr 9, 2026
- Experience
- 5+ years writing Python.
About the job
Build and operate Python backend systems that power real-time voice AI agents and support reliable, secure conversations in production.
What you'll do
- Build and maintain conversation state systems, integrate and orchestrate LLM providers, and develop microservices.
- Write and test Python code; monitor production behavior and improve reliability, conversation quality, and availability.
- Design and operate databases, authentication and authorization, and production metrics, logging, and alerting.
What they ask for
- 5+ years writing Python, with experience building async web apps using FastAPI and testing frameworks.
- Understanding of LLMs, APIs, cloud, and CI/CD pipelines.
- Experience with AWS and Kubernetes.
- Understanding of software architecture and security practices.
Pay
$200K – $350K (base salary)
Tools
Python, FastAPI, asyncio, AWS, GCP, Kubernetes, Redis, Firebase
AI focus
Develop voice AI agent systems, including conversation state, LLM provider orchestration, prompt design, tool/function calling, routing, fallbacks, and agent behavior validation.
Model-written summary · the original posting is authoritative