Software Engineer II (Full Stack, Platform)

At WHOOP, we're on a mission to unlock human performance and healthspan. WHOOP empowers members to perform at a higher level and live longer through a deeper understanding of their bodies and daily lives. Protecting our members’ data and ensuring our systems scale securely and reliably is core to this mission.We are looking for a Software Engineer II (Full Stack Web) to join our Client Platform team, focused on Design Systems and Translations. In this role, you’ll design and build shared frontend and backend systems that enable WHOOP to deliver consistent, high-quality, and globally accessible experiences across web and mobile surfaces. You’ll work across the stack — from frontend component libraries to backend localization services — while also contributing to the infrastructure and tooling that power design systems and internationalization at scale.This role is a great fit for an engineer who enjoys working across web technologies while also tackling platform challenges like design system consistency, localization workflows, and right-to-left (RTL) support. You will play a key role in enabling global expansion by making it easy for teams to build localized, accessible, and visually consistent experiences.RESPONSIBILITIES: Design, build, and maintain full stack systems that power WHOOP’s design system and translation infrastructureDevelop and maintain reusable frontend components and shared libraries using modern frameworks (React/TypeScript)Implement and improve internationalization (i18n) support, including right-to-left (RTL) layouts and bidirectional text handlingPartner with Design to build and scale a unified design system across web and mobile platformsBuild and maintain backend services and APIs that support translation workflows, content delivery, and localization pipelinesEnsure UI components are flexible, accessible, and adaptable to different languages, screen sizes, and regionsImprove and maintain build and CI/CD systems (CircleCI, GitHub Actions) to support fast and reliable deliveryCollaborate cross-functionally with Product, Design, Platform, and Localization teams to deliver scalable solutionsParticipate in code reviews and contribute to best practices around frontend architecture, localization, and design systemsQUALIFICATIONS:2–4 years of professional software engineering experienceProficiency in web development using JavaScript/TypeScript, React, and Node.jsExperience building and integrating RESTful APIsFamiliarity with frontend architecture and building reusable UI components or design systemsExperience with design implementation, taking mockups in tools like Figma and making them realityUnderstanding of internationalization (i18n) and localization best practicesFamiliarity with CSS, responsive design, and modern layout techniquesExperience with relational databases such as PostgreSQL or MySQLExperience working with build systems and CI/CD tools (CircleCI, GitHub Actions)Strong communication skills and ability to collaborate with technical and non-technical stakeholdersExperience implementing RTL support using CSS logical properties and direction-based stylingFamiliarity with bidirectional (BiDi) text handling and localization edge casesExperience with design system tooling (e.g., Storybook) or cross-platform component librariesExposure to translation platforms or localization pipelinesExposure to design tokens, managing tokens for color modes and multiple themesBackend experience in languages like Java, Python, or C#Familiarity with cloud delivery platforms (Cloudflare, Vercel, CloudFront)Experience with accessibility standards (WCAG) and inclusive designLearn 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 $125,000 - $175,000. 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.