# Senior Software Engineer (Frontend, Growth)

**Company:** [WHOOP](https://hotfix.jobs/companies/whoop)
**Location:** Boston, MA
**Role:** Frontend Engineering
**Experience:** 5+ years
**Skills:** TypeScript, React, Next.js, Stripe, Cloudflare Workers, Commercetools, Datadog, Sentry, Amplitude, A/B Testing
**Posted:** 2026-04-15

> Senior Frontend Engineer on Growth team owns web experiences like join flow, checkout, and shop using Next.js, React, and TypeScript. Leads cross-functional projects, A/B experiments, performance optimization, and mentors engineers; requires 5+ years frontend experience.

## Job Description

## Responsibilities
- 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 with long-term maintainability
- Mentor and develop other engineers through code review, pairing, and technical guidance, raising the bar for quality and velocity across the web surface
- Participate in on-call rotations and incident response; lead postmortems and drive improvements that prevent recurrence
- Contribute to Growth's engineering culture through documentation, process improvements, and knowledge sharing

## Qualifications
- **5+ years** of professional experience in frontend software engineering, with deep expertise in **TypeScript**, **React**, and modern web frameworks (**Next.js** strongly preferred)
- Track record of owning and delivering complex, cross-functional web projects from technical design through production rollout
- Strong understanding of web performance optimization, edge computing (e.g., **Cloudflare Workers**), and responsive design at scale
- Experience integrating frontend applications with payment systems (**Stripe** preferred), RESTful APIs, and third-party platforms
- Demonstrated ability to design and run meaningful A/B tests and make data-informed decisions in a growth or product engineering context
- Experience with observability and monitoring tools (e.g., **Datadog**, **Sentry**, **Amplitude**) to proactively identify and resolve production issues
- Proven ability to mentor engineers, lead technical discussions, and influence engineering practices across a team
- Excellent written and verbal communication skills; comfortable operating in an async-first, cross-functional environment

**Bonus**: Experience with ecommerce platforms (**CommerceTools**), feature flag / experimentation infrastructure, or subscription/membership business models

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