The thing is, I'm not really into making (only)games, I'm more into the low level subsystems that come together to make that game.. so what should I build for my portfolio which would show off my engine programming skills? Are tech-demos okay? Or should I do something else? If yes, what should it be?
In my signature link you will find a game called Ghost Toast which you can download and play for free. It is a FPS dungeon crawler that I created using C++ and OpenGL. You can find all the code and tutorials to make this game on my website. Enjoy!
Once you create your game, make sure you add it to your LinkedIn profile and also post YouTube videos of it so that you can get people to see your work.