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 game engineering services focused on gameplay systems and AI development, which is my core expertise across any engine, whether it’s Unreal Engine, Unity, or others. 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 occasionally post to see if any interesting projects come up — ideally from individuals or small studios who are serious about what they’re building. I’m especially interested in working with people or teams who have a clear vision, some funding, and a solid plan in place — whether that’s an individual developer or a startup.
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 game development like 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, feel free to reach out to me via email here.
Cheers