Senior Software Engineer (Backend, Growth)

Design and build scalable and reliable backend services to support growth experiments, e-commerce flows, and member engagement initiatives. Collaborate closely with Product, Design, and cross-functional Engineering teams to define and deliver impactful features. Maintain and optimize APIs and infrastructure using Java, Kafka, Postgres, and AWS technologies. Take ownership of end-to-end development, from breaking down requirements to implementation, testing, deployment, and monitoring. Mentor junior engineers and contribute to the growth of engineering best practices across the team. Professional experience developing large-scale backend systems in a production environment. Deep proficiency in building and maintaining RESTful APIs and working with relational databases (e.g., Postgres). Experience with event-driven architectures and tools like Kafka or SQS. Strong testing practices and clear documentation habits. Ability to thrive in a fast-paced, iterative environment focused on growth and experimentation. Proven collaboration skills across engineering, product, and data teams. A growth mindset and excitement for tackling ambiguous challenges. Bonus: Experience building A/B testing infrastructure or growth-focused engineering features. Learn more about our Software Org and how to be successful in your engineering career at WHOOP via our Career Framework . This role is based in the WHOOP office located in Boston, MA. The successful candidate must be prepared to relocate if necessary to work out of the Boston, MA office. Interested in the role, but don’t meet every qualification? We encourage you to still apply! At WHOOP, we believe there is much more to a candidate than what is written on paper, and we value character as much as experience. As we continue to build a diverse and inclusive environment, we encourage anyone who is interested in this role to apply. WHOOP is an Equal Opportunity Employer and participates in E-verify to determine employment eligibility. It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability. The WHOOP compensation philosophy is designed to attract, motivate, and retain exceptional talent by offering competitive base salaries, meaningful equity, and consistent pay practices that reflect our mission and core values. At WHOOP, we view total compensation as the combination of base salary, equity, and benefits, with equity serving as a key differentiator that aligns our employees with the long-term success of the company and allows every member of our corporate team to own part of WHOOP and share in the company’s long-term growth and success. The U.S. base salary range for this full-time position is $150,000 - $215,000. Salary ranges are determined by role, level, and location. Within each range, individual pay is based on factors such as job-related skills, experience, performance, and relevant education or training. In addition to the base salary, the successful candidate will also receive benefits and a generous equity package. These ranges may be modified in the future to reflect evolving market conditions and organizational needs. While most offers will typically fall toward the starting point of the range, total compensation will depend on the candidate’s specific qualifications, expertise, and alignment with the role’s requirements.