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 Sr. Full Stack Engineer (Product) 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!