iOS Engineer II (Connectivity)

At WHOOP, we’re on a mission to unlock human performance and healthspan. WHOOP empowers people to perform at a higher level through a deeper understanding of their bodies and daily lives. We handle massive amounts of data continuously streaming to the cloud from people improving their health and wellness to the world’s greatest sports teams and athletes, requiring a fault-tolerant and highly available product.

The Connectivity Software Team builds the critical link between WHOOP hardware, the iOS app, and the cloud. As an iOS Software Engineer II on this team, you’ll help build and maintain the software that enables WHOOP’s wearable sensors to communicate seamlessly with the mobile platform. You’ll contribute to connectivity experiences that are reliable, efficient, and largely invisible to the member — ensuring dependable data flow across our ecosystem.

RESPONSIBILITIES:

• Build and maintain iOS application components that interface with WHOOP hardware over Bluetooth Low Energy (BLE), Wi-Fi, and related communication protocols.

• Contribute to background and system-level iOS services responsible for device connectivity, synchronization, and data transfer.

• Write clean, maintainable Swift code using modern iOS patterns and frameworks such as Combine and Swift concurrency.

• Collaborate closely with firmware, mobile, and cloud engineers to investigate and resolve issues across distributed systems.

• Improve the reliability, performance, and efficiency of the WHOOP connectivity experience.

• Contribute to scalable, testable, and maintainable software architecture within the Connectivity team.

• Participate in code reviews, technical discussions, testing, and release processes for the iOS application.

• Document features, implementation details, and operational knowledge using tools such as Jira, Confluence, and GitHub.

QUALIFICATIONS:

• BS or MS in Computer Science, Computer Engineering, or a related technical field, or equivalent practical experience.

• 2+ years of professional iOS software engineering experience.

• Proficiency in Swift and familiarity with iOS system APIs, concurrency, and memory management.

• Experience building and maintaining production-quality mobile applications.

• Familiarity with asynchronous and reactive programming concepts (e.g., async/await, Combine, or similar).

• Ability to debug and troubleshoot technical issues across mobile applications and connected systems.

• Strong collaboration and communication skills with a willingness to learn from and work across disciplines.

• Curiosity, ownership, and a growth mindset when approaching new technical challenges.

Nice to Have:

• Experience working with Bluetooth Low Energy (BLE), Core Bluetooth, or other device connectivity technologies.

• Familiarity with networking concepts such as Wi-Fi, background transfers, or low-level communication protocols.

• Experience working with hardware-integrated mobile applications or IoT systems.

• Exposure to performance optimization, battery efficiency, or reliability improvements in mobile apps.

• Interest in leveraging AI-assisted development tools to improve engineering productivity.

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 $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.

Learn more about WHOOP.