iOS Engineer

About the role

You will collaborate with cross-functional partners to ideate, plan, and iteratively deliver new capabilities that define the next generation of member experiences in the WHOOP app. You will own the foundations that power the iOS application, ensuring reliability, performance, and scalability for critical features like fitness, sleep, strain, recovery, and deep integrations. You will build and maintain native iOS features using Swift, while coordinating closely with backend services through RESTful APIs and authentication flows. You will contribute to technical planning by breaking down requirements, identifying risks and edge cases, and delivering solutions with guidance from senior engineers. You will partner with product management, design, data science, and performance science to shape polished, member-facing features that align with product goals. You will improve app quality through rigorous testing, debugging, code reviews, and performance monitoring to maintain a high standard of reliability. You will document features and technical decisions to support knowledge sharing and help maintain consistent engineering practices across the team.

Key facts

What you'll do

• Collaborate with the team and cross-functional partners through feature ideation, planning, and development to iteratively deliver new capabilities.
• Contribute to technical planning by breaking down requirements into clear tasks, identifying risks and edge cases, and delivering iteratively with support from senior engineers.
• Build and maintain native iOS features in Swift, communicating with RESTful backends to deliver reliable, high-quality member experiences.
• Improve app quality through testing, debugging, code reviews, and performance monitoring to ensure stability and a smooth user experience.
• Document features and technical decisions while learning shared engineering practices and contributing to team knowledge.
• Integrate mobile applications with RESTful APIs, including networking, data parsing, and authentication flows to support seamless member interactions.
• Leverage AI tools where appropriate while maintaining high standards for quality, engineering excellence, and best practices in code and design.
• Participate in the full feature lifecycle, from initial scoping and design discussions to implementation, validation, and post-launch monitoring.
• Support the enhancement of core WHOOP features such as fitness, sleep, strain, recovery, and integrations through performant and maintainable code.
• Work within an agile development process, translating requirements into technical tasks and delivering incremental value in each sprint.
• Partner with design and product management to translate member needs into intuitive and polished user interfaces using SwiftUI and UIKit.
• Optimize app performance, responsiveness, and reliability across a range of iOS devices and OS versions.
• Implement robust networking layers, error handling, and retry strategies to ensure resilience in real-world conditions.
• Apply mobile architecture patterns such as MVVM to structure code for clarity, testability, and long-term maintainability.
• Contribute to CI workflows, code reviews, and automated testing practices to streamline development and reduce regressions.

Requirements

• Demonstrated curiosity for building high-quality software and eagerness to learn in a collaborative engineering environment.
• Familiarity with Swift and modern iOS frameworks such as SwiftUI, UIKit, and XCTest.
• Familiarity with mobile architecture patterns such as MVVM.
• Experience integrating mobile applications with RESTful APIs, including networking and authentication flows.
• Familiarity with iOS development tools and workflows such as Xcode, Git, Swift Package Manager, and CI.
• Demonstrated ability to write maintainable, well-tested code and clear technical documentation.
• Enthusiasm in leveraging AI tools while maintaining high standards for quality and engineering excellence.
• Must be prepared to relocate to Boston, MA to work out of the WHOOP office.
• Must be authorized to work in the United States and not require work authorization sponsorship now or in the future.
• U.S. base salary range for this full-time position is $105,000-$145,000.

Nice to have

• Bonus: Exposure to backend development or cross-platform mobile development.

Practical notes

• 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.
• Employment is full-time.
• WHOOP is an Equal Opportunity Employer and participates in E-Verify.
• Compensation includes base salary, equity, and benefits, with specific ranges defined by role, level, and location.
• 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.
• Interested candidates who do not meet every qualification are encouraged to apply, as WHOOP values character as much as experience and continues to build a diverse and inclusive environment.
• Learn more about the Software Org and engineering career path at WHOOP via the Career Framework at https://engineering.prod.whoop.com/careerframework.
• Learn more about WHOOP at https://www.whoop.com/us/en/careers/?srsltid=AfmBOopKmph9d0DLBlogZu8mx6do0dzjNS8eJlfc4PQqQtdU6F8DGKBg.