Sr. Full Stack Engineer (Product)

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, 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!