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Sr. Product Engineer at Willow Health. Remote Location: Costa Rica (Remote). 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. , Vouched, and . 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!