Software Engineer II (Backend, Growth) at Whoop (Boston, MA)
Whoop· Boston, MA·
Role details
Whoop at a glance
A screen-free 24/7 wearable and subscription platform that tracks sleep, strain, and recovery and coaches members on health and performance.
WHOOP makes a screen-free wrist wearable with always-on sensors and a subscription app that continuously tracks sleep, strain, recovery, heart rate, and HRV, then turns that data into a daily recovery score and personalized coaching. Newer features extend into clinical health, including blood pressure insights, ECG heart screening, and women's hormonal tracking.
~$900M raised · latest: Series G · $575M · March 2026 · backed by Collaborative Fund, SoftBank Vision Fund 2, Mubadala Investment Company, Qatar Investment Authority
Summary
Collaborate with cross-functional teams to build and optimize scalable backend services, APIs, and infrastructure supporting growth experiments and e-commerce experiences. Write maintainable code using Java, Kafka, and AWS while contributing to architecture and high-availability systems.
Job description
At WHOOP, we're on a mission to unlock and inspire performance for life. WHOOP empowers members to perform at a higher level through a deeper understanding of their bodies and daily lives.
The Growth team is responsible for accelerating member acquisition, activation, engagement, and retention through rapid experimentation and thoughtful product development. As a Software Engineer II (Backend), you’ll contribute directly to building and optimizing backend systems that power WHOOP’s growth initiatives. You’ll deliver high-impact features that directly influence member and business outcomes. You’ll work closely with Product, Design, and fellow engineers in a fast-paced, experiment-driven environment where iteration, measurement, and continuous improvement are core to how we build.
RESPONSIBILITIES
- Collaborate closely with product managers, designers, and fellow engineers to develop scalable and reliable backend services.
- Build, maintain, and optimize APIs and infrastructure supporting our acquisition funnels, e-commerce experiences, and membership growth experiments.
- Write well-tested, maintainable code using technologies such as Java, Kafka, Postgres, and AWS.
- Break down feature requirements into actionable tasks, prioritize work, and consistently deliver on sprint commitments.
- Contribute to backend architecture discussions and implementation of scalable, high-availability services that support millions of users.
- Work with data scientists and analytics engineers to support experimentation and measure performance.
- Participate in code reviews and collaborate on best practices with your engineering peers.
QUALIFICATIONS
- Professional backend engineering experience in a production environment.
- Proficiency in building APIs and working with relational databases (e.g., RESTful APIs, Postgres).
- Experience with event-driven systems and asynchronous processing tools such as Kafka or SQS.
- Skilled in writing comprehensive tests and clear documentation.
- Demonstrated ability to work cross-functionally and communicate clearly with technical and non-technical stakeholders.
- A growth mindset and eagerness to learn from feedback and new challenges.
- Bonus: Experience with A/B testing frameworks or growth-focused engineering initiatives.
Why work at Whoop
- Hybrid workspace – employees are on-site 4 days a week in Boston’s “best office” whoop.com - Careers
- Benefits – flexible time off, above-market compensation, paid parental leave, health support whoop.com - Careers
- Employee Resource Groups – ADAPT (disability inclusion), BLACK@WHOOP, LGBTQ+ (WHOOP GOOP), Veterans and Military Personnel, Women of WHOOP, Women in Science and Engineering, WHOOP Parents whoop.com - Careers
- High selectivity – only 0.13% of applicants are hired, reflecting a rigorous, standards-driven culture whoop.com - Careers
- Equal Opportunity Employer – committed to diversity and inclusion in all employment decisions whoop.com - Careers