Addon & Gamemode Dev (StarWarsRP, CWRP, Zombie Survival & more) | Lua / C++ Dev

Hi,

I’m a professional game developer based in Germany with over 10 years of experience, which comes mainly from modding Valve games like CS:GO, Team Fortress 2, Left 4 Dead 2, but also Garry’s Mod since December 2023.

I’ve worked on many projects during this time and even ran my own Left 4 Dead 2 community called Unity Gaming Network from 2016 to 2021. Because of this, I’m very familiar with the internals of the Source engine and therefore Garry’s Mod.

I’m self-employed and offer addon development, including custom gamemodes, gameplay systems, and even C++ binary modules (which enables you to do far more than is possible with Lua). I also offer consultation for developers who need help with their projects, whether it’s guidance, support, or a second opinion. I offer fixed-price milestones for larger projects, as well as shorter workshops and coding sessions if you want guidance, support, or a smaller scope.

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

* Portfolio: justin-chellah.com

* GitHub: github.com/justin-chellah

* YouTube: youtube.com/@Justin_Chellah

People usually hire me for complex projects, such as custom gamemodes or creating a custom NextBot base from scratch, but I’m also open to smaller projects. I prefer working with clients over the long term, helping communities build stable, high-quality servers that stand out from their competition. After all, players prefer smooth, bug-free servers that run well and provide a great experience. A lot of server owners have run into performance issues, buggy addons, unresponsive developers, or servers breaking down years later due to bad code. That’s where I come in to help, which has always made them happy :)

You can find all the details about my workflow, offering, and pricing on my service page – including how I work (fixed-price, no hourly billing), my process, and answers to some common questions.

If this sounds exciting to you, feel free to add me on Discord at justin_chellah or send me an email, if you prefer that.

Cheers!