Bug fixing, bug reporting, implementing new features, testing and many more. You can check full list of my contributions.

OpenWrt

Added support for router ZyXEL Keenetic Start, here is pull request with all details.

TSMOD.NET

Developed patcher dynamic library for game client to fix several problems, such as periodic crashes and broken UTF-8 support in HUD-text. Along with that, it adds new features: on-screen speedometer, hiding of spectator panel, fix for Barrett "silent shoot".

Technically, patcher generating proper executable code in runtime using AsmJit library, and then generated code injected in specific places of game client library to change behavior in the desired way.