Roman – iOS, Swift, REST API

The ultimate solution for seamless door access right from your smartphone. Experience the convenience of effortlessly locking and unlocking your door with just a tap on your phone. Simply present your phone to the lock, and voilà, your door is open.

• developed project from scratch
• created custom animation layout for card transition
• release management
• 3rd party SDKs integration

Fintech department of one of the largest Ukrainian banks (since 1991, 1.8M clients): IOS app ~ 250k active users, 4.8 scores on App Store, crash-free rate: ~99.7%.​

Responsibilities included, but were not limited to:

• Interview and new members onboarding;
• Assessment and individual development plans for chapter members;
• App scalability and stability;
• Project roadmap and tech dept strategy;
• Rules and standards of development, technological stack;
• Evaluation and implementation of business tasks.

Among Roman's achievements:

• Scaled team size from 3 to 17 members;
• Moved from a monolith to a modular architecture and a feature team;
• Moved to Trunk-based Development + firebase remote config;
• Fixed memory management problems and improved app stability (from 98.4 to 99.7 %);
• Reduced time-to-market time through system design development (at least 15%);
• Optimized CI/CD workflow and improved release process;
• Reduced build time of the project by more than 20%;
• Developed craft and skills matrix for IOS Chapter;
• Increased the level of cybersecurity of the mobile application.

German startup in the fashion industry to measure foot size with Augmented Reality

• Developed custom solution for feature points detection in front camera frames (based on - Harris corner detection algorithm);
• Developed own score system (based on feature points, contrast value, light condition, etc.) to detect the best camera in real-time (works really fast);
• Improved ARKit behavior in lousy light conditions – drifting and Depth Map problems;
• Fixed memory management problems and created a crash catcher layer that stored the last Stack Trace.

App for truck drivers. USA product company specializing in fleet-management services and (ELD) electronic logging devices in USA and Canada. The app was rated 4.4 out of 5 stars on the overall user experience.

• Rewrote connection logic for ELD - it was unstable before, and many users complained about connection issues. Connection workflow consists of many stages and depends on user type. Roman developed new logic based on NSOperation and NSOperationQueue + smart error handling logic;
• Developed several dozens of new screens with custom UI components;
• Created layer (based on Lua programming language + swizzling) that helped to resolve different types of mistakes or bugs on the client side;
• Developed an algorithm for finding points along the route (within a certain radius);
• Communicated with app customers via the Support channel and helped them solve problems;
• Worked on an Android project and wrote new functionality for the app on both platforms.

Worked on apps for one of the biggest German television news channels, “n-tv.” Support existing apps (IOS, iPadOS, watchOS, tvOS) and develop new features + the CarPlay app.​

• Developed apps for Apple ecosystem like CarPlay, tvOS, and watchOS;
• Solved architecture and performance problems;
• Converted Objective-C code to Swift.