Growth Frontend Engineer: Next.js, Experiments

WHOOP; Boston (MA); On-site; USD 150,000 - 215,000; Full time

Benefits offered by this job

Generous equity package

Relocation assistance

Competitive base salary

Job summary

WHOOP in Boston, MA, is seeking a Senior Software Engineer for the Growth team to own the web experiences—join flow, checkout, and shop—driving conversion and member engagement. You will write TS/React/Next.js, work with Stripe and CommerceTools, mentor peers, and run experiments while shaping scalable web architecture with a focus on performance and accessibility.

The role requires 5+ years of frontend experience, Next.js expertise, observability tooling, and strong cross‑functional

Qualifications

• 5+ years of frontend software engineering experience with TypeScript, React and Next.js.
• Own and deliver complex cross-functional web projects from design to production rollout.
• Strong understanding of web performance optimization and edge computing at scale.
• Experience integrating frontend with Stripe, RESTful APIs and third-party platforms.
• Ability to design and run meaningful A/B tests and make data-informed decisions.
• Experience with observability tools (Datadog, Sentry, Amplitude) to resolve issues.
• Proven ability to mentor engineers and lead technical discussions across team.
• Excellent written and verbal communication; comfortable in async, cross-functional environment.
• Bonus: Experience with CommerceTools, feature flags or subscription models.

Responsibilities

• Own the architecture and technical direction of WHOOP's web experiences, including Next.js join flow, Cloudflare Workers edge, and Stripe-powered checkout.
• Lead cross-functional projects end-to-end from planning through rollout with Product, Design, and Analytics.
• Design and execute experiments (A/B tests) with rigorous instrumentation and analysis tied to North Star metrics.
• Drive frontend performance, accessibility, and reliability across devices and browsers.
• Write clean, well-tested TypeScript/React/Next.js code and integrate with backend services and ecommerce platforms.
• Mentor engineers through code reviews and technical guidance, raising quality and velocity.
• Participate in on-call rotations and postmortems to drive improvements.
• Contribute to Growth's engineering culture with documentation and process improvements.

Skills

TypeScript

React

Next.js

Frontend development

Web performance

Cross-functional collaboration

Tools

Stripe integration

Cloudflare Workers

CommerceTools

Datadog

Sentry

Job description

WHOOP in Boston, MA, is seeking a Senior Software Engineer for the Growth team to own the web experiences—join flow, checkout, and shop—driving conversion and member engagement. You will write TS/React/Next.js, work with Stripe and CommerceTools, mentor peers, and run experiments while shaping scalable web architecture with a focus on performance and accessibility.

The role requires 5+ years of frontend experience, Next.js expertise, observability tooling, and strong cross‑functional