Senior Backend Engineer (Python)NOTE: This is an engineering position. You will be writing code, a lot of it and it will be a lot of work... if you're looking for a cushy corporate job where nothing get done, I recommend checking out some of our competitors. If you're looking to be a part of a winning team and to make a real difference read on.
This role is in office 5 days a week in San Francisco.Your day to day:- Build and maintain Python-based state systems that drive what the voice AI says and does across complex, real-time conversations.
- Integrate and orchestrate multiple LLM providers, including prompt design, tool/function calling, routing, and fallbacks.
- Write clean, maintainable, high-performance Python code, leveraging asyncio, OOP, and best practices.
- Write automated tests and validation suites to ensure correctness, resilience, and safe iteration of agent logic and state transitions.
- Monitor production systems, debug agent behavior, and continuously improve reliability and conversation quality.
- Implement comprehensive metrics, logging, and alerting to validate correctness, detect failures early, and maintain extremely high availability.
- Desgin database schemas, optimize queries, and operate both SQL and NoSQL databases in production.
- Build and operate authentication and authorization mechanisms with strong security guarantees.
- Design and build microservices-based architectures.
Qualifications:- 5+ years writing python, experience writing async web apps using fast api, testing frameworks
- Understanding of LLMs, APIs, Cloud, CI/CD pipelines
- Comfortable with understanding technical specifications,
- Understanding of good architecture, security practices
- Strong technical and communication skills
- Experience with AWS & Kubernetes
Our Software Stack:- Backend: Python, microservices, async programming
- Cloud & Infrastructure: AWS, GCP, Kubernetes, Redis
- Databases: Firebase, Supabase
- Frontend: Next.js
- Observability & Monitoring: Datadog, logging, metrics, tracing
- Telephony & Voice AI: SIP, voice APIs, real-time call handling
- Other tools & practices: CI/CD, automated testing, resilient architecture
