Senior Product Engineer

• Own the AI Coach, including prompting, conversation state and progression, Pinecone retrieval, model selection and evaluation, and the safety/crisis layer
• Test the AI Coach against scripted clinical scenarios and build evaluation harnesses for automated scenario-suite testing
• Own the backend using Python 3.12, FastAPI, GraphQL, SQLAlchemy, PostgreSQL, and AWS
• Own mobile and web delivery with React Native for iOS and Android and React for web
• Manage App Store, Google Play, and Stripe subscriptions
• Own release engineering, including CI/CD, environments, signing credentials, monitoring, backups, and rollback
• Deliver fast, safe, frequent, reversible releases
• Apply product sensibility to mobile and web user experience
• Translate technical decisions into plain language for the founder and clinical team
• Plan work, obtain approval on direction, execute independently, and report outcomes
• Operate as the initial sole engineer with limited as-built documentation
• Build systems enforcing legally and clinically approved safety thresholds and crisis handling
• Report directly to the non-technical founder

• Proven experience shipping LLM-based products to production: prompt architecture, conversation state machines, RAG/retrieval, evals, moderation and safety handling
• Strong backend engineering with Python, FastAPI or similar, SQL/PostgreSQL, and AWS
• Comfortable owning infrastructure, CI/CD and production operations solo
• Solid React Native and React experience, including shipping and debugging on both iOS and Android
• Experience with in-app purchase flows on both mobile stores and Stripe on web
• Demonstrated AI-first development practice and daily use of agentic coding tools
• Judgement to review and own AI-generated code
• Product sensibility and a genuine eye for mobile and web UX
• Track record of owning a product or major system end-to-end with minimal technical oversight
• Excellent written communication for a non-technical founder
• Experience or demonstrable seriousness with privacy, security and access controls around personal/health data
• Experience in mental health, health tech or other regulated/safety-critical consumer products (nice to have)
• Experience taking over a codebase from an agency or departing team (nice to have)
• Mobile release operations experience (nice to have)
• Analytics and growth tooling experience (nice to have)
• Voice features, push notification strategy, and CRM/email platform integrations (nice to have)

• Flexibility in work hours and location, with a focus on managing energy rather than time
• Access to online learning platforms and a budget for professional development
• A collaborative, no-silos environment, encouraging learning and growth across teams
• A dynamic social culture with team lunches, social events, and opportunities for creative input
• Health insurance
• Leave Benefits