Senior Product Engineer (Typescirpt)

ABOUT US We are Playbook, a leading creator platform for fitness, health, and wellness. Our mission is to help fitness creators build sustainable businesses, while enabling hundreds of thousands of users to live healthier lives. We are a fast-growing company in the fitness tech space, operating as a remote-first, product-driven team that values ownership, direct communication, and a strong growth mindset. We believe in "drivers, not passengers" — everyone is encouraged to take responsibility, think proactively, and act like an owner. ROLE OVERVIEW We're looking for a Senior Product Engineer (TypeScript) to join our remote engineering team. You'll work on meaningful, user-facing product features across the stack — building reliable backend services and polished web and mobile experiences. Our product spans three surfaces sharing one language: a ReactJS web app, a Node.js backend (GraphQL), and a React Native mobile app — TypeScript everywhere. We don't expect you to be a deep expert in all three. We're looking for a T-shaped engineer: deep senior expertise in one of these areas, working proficiency in the others, and genuine willingness to ship across the whole stack. Whether your strongest suit is frontend, backend, or mobile matters less than the profile itself: deep in one area, capable across all three. You'll collaborate closely with Product and Design to deliver solutions aligned with real customer needs. This role is best suited for a senior individual contributor who enjoys hands-on development, understands that good architecture starts with clear contracts, and thrives on solving complex problems in a fast-moving startup environment. RESPONSIBILITIES Design and implement new features across the stack (Node.js, ReactJS, and React Native), with a strong focus on usability, clarity, and real user value, shaping APIs and GraphQL contracts as part of the feature design process. Spend the majority of your time in your area of deep expertise, while regularly contri