[smilesnd]

I would say pair programming with others and reading code as a group together is the best way to level up. While reading open source projects will fill in some knowledge gaps and teach you to write cleaner code. You may miss the subtle aspects that makes the code one step better then others. When I pair program with seniors I get to see how they come at a problem, make design decisions, and find out why they do something some way. Pairing with a less senior developer causes you to reflect on yourself. If you can't explain something to someone else in simple terms then you might need to revisit that idea. Also a good way to remind yourself how much you have grown as a developer, and how much farther you still need to go. Pair programming in a group is a great for a team to understand how each other thinks. It also confirms styling techniques for the code base and also allows people to fill in random knowledge gaps they may not know they have. Finally it has been proven over and over again the more a team communicates with one another the better they work as a team even though our codes and docs suppose to be the best way to convey our thoughts to other programmers. Spending some time every day talking and working together is the fastest path to bring entry level and junior level developers to a senior level.