Senior Software Engineer, Billie AI team

Key responsibilities What you'll do Build and improve AI voice and chat agents that handle thousands of patient conversations every day. Work on real-time systems where low latency, high concurrency, and reliability are critical. Develop AI-powered cost estimation algorithms using LLMs and statistical analysis of historical data. Analyze production data, identify patterns, form hypotheses, test hypotheses, improve accuracy. Design backend systems that handle high traffic, external integrations, and complex workflows. Own features end to end. From understanding the business problem to implementation, production monitoring, and measuring results. Build metrics and dashboards to understand how our products perform and where they need improvement. Make pragmatic engineering decisions. Know when to move fast and when correctness and reliability cannot be compromised. Challenge product ideas, propose better solutions, and defend your decisions with data and business reasoning. Required qualifications What we're looking for Strong Python and PostgreSQL experience. Solid system design skills. Ability to make and explain architectural decisions. Experience with data analysis, SQL, and building metrics to support decisions. Experience using AI coding tools in your daily workflow. Strong product and business thinking -- Ability to understand business requirements, evaluate trade-offs, and make decisions based on customer and business impact. End-to-end ownership -- Experience taking projects from initial requirements through design, implementation, deployment, and measuring results. Nice to have Experience writing and evaluating prompts for production AI systems. Experience building AI-powered products.