Senior Software Engineer (Frontend, Growth)

About this role

At WHOOP, we're on a mission to unlock human performance and healthspan. WHOOP empowers members to perform at a higher level through a deeper understanding of their bodies and daily lives. Our wearable technology and digital experiences translate complex physiological data into clear, personalized insights that help members improve their fitness, health, and recovery.

The Growth Team at WHOOP is a fast-paced, experimentation-driven group focused on driving user acquisition, activation, engagement, and retention. As a Senior Software Engineer on the Growth team, you will own and drive the technical direction of our web experiences, including our join flow, checkout, and shop that directly impact conversion, revenue, and member engagement. You will lead cross-functional initiatives from technical planning through rollout, mentor engineers across the team, and shape the architecture and practices that allow Growth to move quickly and confidently at scale.

### RESPONSIBILITES:

• Own the architecture and technical direction of WHOOP's web experiences, including our Next.js-based join flow, Cloudflare Workers edge infrastructure, and Stripe-powered checkout
• Lead cross-functional projects end-to-end from brainstorm and technical planning through implementation, QA, rollout, and post-launch analysis, partnering closely with Product, Design, and Analytics
• Design and execute experiments (A/B tests) with rigor, ensuring proper instrumentation, measurement, and iteration based on impact to North Star metrics
• Drive frontend performance, accessibility, and reliability across devices and browsers, establishing standards and monitoring that the team can build on
• Write clean, well-tested, production-quality code in TypeScript/React/Next.js and integrate deeply with backend services, payment systems (Stripe), and ecommerce platforms (CommerceTools)
• Author and review technical plans, identify architectural tradeoffs, and make sound judgment calls that balance speed wi...