Hamza Saleem

Summary

What I did

• Built a system for all exercise types (cardio, strength, timed) with zero data loss during migration.
• Users now log any exercise in one workflow instead of three separate ones.
• Surfaced recent workout data during logging to reduce friction.
• Tested the feature and rolled out after validating impact.
• Designed version management and user prompts across iOS and Android, enabling smooth updates with version-aware messaging.
• Replaced rigid legacy system with full edit/delete support, giving users control over their history.
• Fixed crashes across the app-including timing issues and edge cases-improving reliability.
• Resolved duplicate overlaps in the onboarding flow, preventing user confusion during signup.
• Separated authentication concerns, removed hundreds of lines of deprecated code, and improved planner performance.
• Overhauled the workout logging system and refactored the authentication module.
• Identified and resolved potential scalability issues in the exercise log feature related to unique unit types.

Results

• Overhauled the exercise log system to ensure scalability for future exercise types with unique units.
• Implemented universal entries and a scalable front-end architecture to allow the team to add new unit types easily.
• Maintained a 4.6★ iOS rating for an app with 60K+ users.
• Achieved zero data loss during a major exercise system migration.
• Achieved a 20-25% reduction of crash reports.
• Reduced loading times by 15%.