Sr. Product Engineer

ABOUT WILLOW Willow is a telehealth company focused on personalized, responsible GLP-1-based weight loss care. We combine medical expertise with a supportive, patient-centered approach to help people feel more confident and comfortable in their bodies. Our goal is to make high-quality care accessible, thoughtful, and designed to fit real lives. ABOUT THE ROLE We're hiring a Senior Product Engineer to own meaningful pieces of the product end-to-end. You will work across our patient, provider, and admin applications, our core API, and the underlying AWS infrastructure. We are looking for an engineer who views code as a tool to solve user problems and thrives in a high-ownership environment. You should be comfortable picking up a problem that spans frontend, backend, and vendor integrations, defining the right technical shape, shipping it, and iterating based on real-world usage. WHAT YOU’LL DO - Build and optimize complex, state-machine-driven intake flows using React and Next.js to manage clinical eligibility and patient state. - Manage the scaling of our NestJS "majestic monolith" and help determine when and how to extract focused services as our domain models grow. - Ship strictly-typed TypeScript features across a Turborepo monorepo, ensuring high performance for our patient, doctor, and admin interfaces. - Design and maintain Postgres schemas and handle asynchronous job queuing (retries, idempotency) via pg-boss. - Connect and scale third-party integrations, including Stripe, Authorize.Net http://Authorize.Net, Vouched, and Customer.io http://Customer.io, to power clinical and business workflows. - Own deployments and infrastructure health within AWS, utilizing Datadog for observability and incident response. - Participate in (and lead) thoughtful code reviews to maintain high standards for readability, maintainability, and test coverage across the team. - Document architectural decisions and API contracts to ensure the team can scale and new members can onboard quickly. - Proactively identify bottlenecks in the patient onboarding funnel or backend services and implement optimizations to maintain a "snappy" user experience. - Ensure that all features are built with security best practices in mind, particularly regarding the handling of sensitive patient data. WHAT WE'RE LOOKING FOR - 8+ years shipping full-stack TypeScript, with real ownership of features in production. - Strong on React / Next.js on the frontend and a modern Node backend (NestJS, Express, or similar). - Comfortable in Postgres, schema design, modern ORMs, and a sense for the cost of a bad query. - Experience with event-driven systems: queues, retries, idempotency, distributed gotchas. - Real AWS fluency, you can read a container deployment spec and trace an incident without hand-holding. - Solid instinct for product: you care whether a feature actually works for users, not only whether it ships. NICE TO HAVE - State-machine-first codebases. - Healthcare, HIPAA, or regulated-domain experience. - Integrating payments such as Stripe. - Shipping LLM-powered features in production. - Background in high-conversion onboarding / funnel work. - Minesweeper skills WHAT'S IN IT FOR YOU? As a full-time member of our team, you’ll enjoy: - Flexible working hours - Work wherever you choose. - Fun and casual work environment. - We are a diverse, global team!