Having worked in 2 startups, almost all I've learned I did myself. Finding people more talented/experienced than you is hard in startups, and there's this real

Having worked in 2 startups, almost all I've learned I did myself. Finding people more talented/experienced than you is hard in startups, and there's this really bad tendency to build everything as a prototype, while very rarely you get to convert something to a stable product. So while you get to practice on possibly a broad array of topics, you rarely get to get beyond the beginner level / learn the best practices for it. In the long run, this can be really disruptive for your career if you don't take the time to practice on your own.