iOS Engineer II (Client Platform)

Whoop • Boston, MA

2d • $125,000 - $175,000 • Onsite

About The Position

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.
The Client Platform team is responsible for building the foundational mobile and web systems that power WHOOP’s member experience globally. As an iOS Engineer II on this team, you will develop shared frameworks, design system components, and internationalization capabilities that enable teams to deliver consistent, high-quality experiences across regions and languages.
In this role, you will focus on advancing WHOOP’s global readiness by supporting internationalization (i18n), including right-to-left (RTL) language support, while also contributing to a scalable and robust design system. You’ll work closely with backend, design, and product teams to ensure the app is flexible, accessible, and performant across diverse user needs.

Requirements

• 2–4 years of professional iOS development experience.
• Proficiency with Swift and iOS frameworks such as SwiftUI and UIKit.
• Strong knowledge of iOS app structure, lifecycle, concurrency, and memory management.
• Experience integrating with RESTful APIs and backend services.
• Experience working with atomic design principles and reusable component design
• Familiarity with modern mobile architecture and design patterns (e.g., MVVM, modular design).
• Experience with version control (Git) and productivity tools (Jira, Confluence, GitHub).
• Product-minded engineer with empathy for the member experience.

Nice To Haves

• Prior experience working on shared libraries, SDKs, or mobile platform tooling that enable other teams.
• Knowledge of and experience working with mobile Design Systems on shared mobile infrastructure teams
• Exposure to design tokens, managing tokens for color modes and multiple themes
• Experience with infrastructure concepts such as CI/CD pipelines, mobile build systems (Fastlane, Firebase), or dependency managers (SPM, CocoaPods).
• Familiarity with distributed backend systems and mobile developer enablement tooling.

Responsibilities

• Design, build, and maintain scalable iOS features that integrate with WHOOP’s platform services and APIs.
• Collaborate with backend, infrastructure, and product teams to ensure seamless integration between mobile apps and core platform systems.
• Implement mobile architecture patterns (e.g., MVVM) and best practices to ensure reliability, maintainability, and scalability.
• Contribute to developer enablement by improving shared libraries, frameworks, and tooling for the iOS codebase.
• Monitor app performance, diagnose issues, and optimize for responsiveness and efficiency.
• Write well-tested, secure code and participate in code reviews to uphold high engineering standards.
• Document technical decisions, features, and architecture to support knowledge sharing and team growth.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Education Level: No Education Listed