Available for freelance work

Hi, I'm Kacper Kostka

Freelance programmer from Poland. I build games, engines, and software tools with passion. Core member of Cube Software.

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About Me

I'm a self-taught programmer from Poland with a deep passion for game development, low-level programming, and creative software projects. I work primarily in C++, JavaScript, and Python, but I'm comfortable picking up whatever the project needs.

Outside of code I'm into electronics, skateboarding, physics, and chemistry — and I've built Tesla coils, coil guns, and other hardware projects in my spare time.

Core member of the indie dev group Cube Software.

See Hardware Projects →

Languages

C++ JavaScript Python C# GDScript Lua HTML / CSS

Tools & Engines

Godot Unity OpenGL Git Linux Arduino

Interests

Game Dev Electronics Skateboarding Physics & Chem

Projects

A selection of games, engines, and tools I've built.

In Dev

stupgam

Multiplayer open world 3D game with a procedurally generated city. Built in Godot. Not public yet — stay tuned.

GodotGDScriptMultiplayer
Ongoing

PolyGun

Multiplayer voxel engine written in C++. Started by me and collaborators, now continued mostly by mrkubax10.

C++OpenGLNetworking
Released

SussyCraft

Funny Android game based on the Minetest engine. Reached 10 000+ downloads on Google Play.

MinetestLuaAndroid
Archived

Fractal Engine

3D OpenGL game engine written in C++. An old but nearly finished personal engine project with a basic rendering pipeline.

C++OpenGL
Archived

Farmers League

2D platformer sandbox game built in Unity (C#). Published on Google Play.

C#UnityAndroid
Hardware

Hardware Projects

Tesla coils, coil guns, DIY Atari 2600 controllers, badUSB devices and more. Where electronics meets software.

ElectronicsArduinoRaspberry Pi Pico

Work With Me

Looking for a reliable programmer for your next project? I'm available for freelance work.

Freelance Profile
★★★★★ 5.0

Hire me for your project

Game development, CLI tools, automation, web apps and embedded systems — let's build something great together.

  • Game Development (Godot / Unity / C++)
  • CLI Tools & Automation (Python / JS)
  • Web Development (HTML / CSS / JS)
  • Hardware & Embedded Systems
View Fiverr Profile →

Direct Contact

Prefer to talk directly? Reach out by email or find my work on these platforms.

Contact