Oleh Tolstoi

Outstaff contract for PeerPlay (Merge Cruise: Mystery Puzzle). - Designed and built an ads mediation system that selects the best-performing loaded ad (Rewarded / Interstitial) by eCPM, with LiveOps-configurable rules (AppLovin MAX, Singular). - New LiveOps features, a full game reskin and performance optimization. - Built agentic AI workflows - shared Claude Code skills adopted by the team - for Sentry crash analysis and user-data analysis.

Minion Rush. - Gameplay mechanics with .NET + gRPC backend services and custom online game tools. - Code review, mentoring, sprint planning, feature decomposition and risk management in Scrum. - Third-party SDK integration; proposed improvements to the internal SDK team that improved stability across studio projects. - Anti-cheat hardening, performance analysis and debugging with QA, VFX and Animation teams.

Idle Siege. - Designed and built Game Pass and Battle Pass (client + backend) and server-configured LiveOps events. - Modular character customization: equipped items, animations and cosmetic content. - Integrated Wwise and implemented the game's audio system (events, banks, mixing states) with SFX artists. - Performance optimization and profiling with Unity Profiler and Frame Debugger. R&D. - Multiplayer gameplay on Photon Quantum (deterministic rollback): quick-time events that increased player engagement

- Led development of the open-world PC game I Am Jesus Christ (Steam) as gameplay engineer. - Mentored a team of 3 middle/junior developers. - Ran an internship for 3 trainees: designed their development course and mentored them on live projects. - Prototyped games for Chess.com; built multiplayer games with Photon. - R&D and rapid prototyping; wrote technical tasks for Art teams.

Formerly 4FriendGames (Playrix studio). - Storykeepers (Big Fish Games): match-2/3 features, boosters system, meta-game integration and optimization. - Worked with a custom C++ engine; prototyped an isometric meta game. - Mentored 2 junior developers.

Chess Adventure for Kids for Chess.com: led prototyping, gameplay and tech pipeline.

- Multi-platform 2D/3D app for playing user-created interactive stories, with social platform integration. - Built a node-based editor for creating interactive games. - Back and front end for publishing stories and downloading them into the game.

- VR, AR, MR and WebGL projects: applications for Microsoft HoloLens, Google VR and Vuforia AR. - Built a HoloLens showcase application with server interaction. - Prototyped a Vuforia AR application.