iOS App Developer - Fitness Tracking Application

Fitness app helping users track workouts, nutrition, and progress needs experienced iOS developer who can build features users actually want while keeping app performance smooth. We are past MVP stage with paying customers but need developer taking ownership of iOS codebase as we scale.

Development responsibilities

Build new features based on user feedback and product roadmap including workout tracking variations, social features, and premium functionality. Optimize app performance ensuring smooth scrolling, fast load times, and battery efficiency during workout sessions. Integrate HealthKit pulling data from Apple Watch and iPhone sensors for accurate tracking. Implement in-app purchases and subscription management handling payment flows correctly. Fix bugs reported by users prioritizing crashes and issues blocking core functionality. Write maintainable Swift code following best practices so future developers can work with your code. Collaborate with backend team ensuring API integrations work reliably. Test across different iPhone models and iOS versions catching compatibility issues. Submit app updates to App Store managing review process and addressing Apple feedback.

Technical requirements

5+ years building iOS applications with multiple apps published in App Store proving you ship products. Expert Swift knowledge writing clean modern code not legacy Objective-C patterns. Deep UIKit experience building custom interfaces that feel native not web-wrapped. HealthKit integration experience pulling fitness data from Apple ecosystem correctly. Understanding of Core Data or Realm managing local storage for offline functionality. Familiarity with common iOS architectures like MVVM keeping code organized. Experience with push notifications engaging users at right moments. Knowledge of App Store submission process navigating reviews and compliance requirements. Portfolio showing fitness, health, or similar consumer apps demonstrating relevant experience.

What separates strong candidates

You have shipped consumer apps people actually use not just internal business tools. Understanding of fitness and health tracking knowing what data matters to users. Performance optimization skills making apps feel fast even with complex features. User-focused mindset caring about experience not just checking off technical requirements. Communication ability explaining technical decisions to non-technical team members. Proactive approach suggesting improvements rather than just executing assigned tasks.