I'm currently applying for jobs as a software developer. In my current position, I co-developed one of our "prime" applications of our company. The application itself is niche, but there are plenty of screenshots and informational material (and even a free version) on the companies website available .
Several of the companies I want to apply would like to see code (which I have in some personal projects on GitHub) and work references. Can I somehow use this as a sample of my work (without revealing any sensitive internal information or code of course)? I thought of including it as a short paragraph in the cover letter, broadly explaning some of the patterns and technologies we used.