● Developed the entire iOS client for a real-time live trivia game (100k+ concurrent players) from scratch. ● Participated in the design of client-server protocols for real-time gameplay events. ● Implemented synchronization mechanisms for multiple real-time data streams (video, gameplay events, group chat). ● Ensured stable client performance under high concurrency and low latency constraints. ● Developed iOS features for Citifox AR City Guide — interactive city exploration with augmented reality navigation. ● Implemented AR functionality allowing users to identify nearby landmarks through the camera view. ● Implemented the entire iOS client for Word Masters — a multiplayer word puzzle game reaching #1 top-grossing in Russia. ● Designed and maintained cross-platform core gameplay logic in C (iOS, Android, and HTML clients). ● Led architecture migration from MVC to VIPER and language transition from Objective-C to Swift. ● Designed and implemented an animation system supporting scripted, frame, and Lottie animations. ● Implemented an internal A/B experimentation framework for rapid testing of gameplay and product hypotheses. ● Led full iOS development lifecycle for Infome — business social platform with recommendation-driven discovery. ● Contributed to product decisions that improved user engagement and monetization metrics.

● Conducted UX research and prototyped interaction concepts for mobile navigation. ● Developed MVP implementations to validate UX hypotheses for a 3D mobile mapping service. ● Contributed to performance optimization of the rendering engine.