Senior Backend Engineer

Responsibilities

• 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.
• Design 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 FastAPI, 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.

Software Stack

• Backend: Python, microservices, async programming.
• Cloud & Infrastructure: AWS, GCP, Kubernetes, Redis.
• Databases: Firebase, Supabase.
• 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.