Gameplay Programmer with over 7 years of experience in Source

Hi everyone,

I’m a professional game engineer based in Germany with over 9 years of experience, which comes mainly from modding Valve games like CS:GO, Team Fortress 2, and Left 4 Dead 2.

I’m self-employed and offer addon development, including custom gamemodes, gameplay systems, and even C++ binary modules for more advanced features. I also offer consultation for developers who are looking for technical guidance or a second opinion.

You can find examples of my work and past projects here:

* Website: justin-chellah.com

* GitHub: github.com/justin-chellah

* YouTube: youtube.com/@Justin_Chellah

I’ve laid out my workflow, services, and pricing structure in detail on my website if you want a clear breakdown of how I work (fixed-price model, no hourly billing), my process, and answers to common questions.

I’m especially on the lookout for big, complex projects that most developers shy away from, since those are my specialty. That said, I always welcome serious project inquiries, especially when you’re as committed to the idea as I am.

I also work with a custom set of General Terms & Conditions (GTC) that acts as the contract. It goes over each side’s obligations, covers common risks and liabilities specific to mod development like game/engine updates or unexpected tech issues, to set clear expectations and make sure everything stays fair and transparent for both of us. It also protects you, and under German law this type of agreement is considered a 'work service contract', which means I’m legally obligated to deliver a successful result.

If you’re interested now or in the future, feel free to add me on Discord at justin_chellah and share a bit about yourself and your project.

Cheers