I work with a small (12) group of developers for a certain startup. I'm been the longest at the company, so i supposed you can call me lead. The title rotates from project to project. Gives everyone the change to lead the team. Some of them are Senior developers, some are fresh out college or just recently bootcamps. Things that have had significant results in the wisdom and effort throughput are responsibility, teamwork and repetition. I'll expand.
Responsibility - Often times entry-level jobs start out by slowly intruding material until a certain level of knowledge is gain. Not with us. You're going to hit the ground running. Day one you will clone the repo and start hacking at it. You will be expected to complete a set of amount of features/bugs or whatever. How? Google it. This is not left without supervision and guidance of course. All work is peer-reviewed and collaborated on. We even share tips on how to be a stack overflow power user. Countless times a junior dev has left Seniors saying, "Damn, I should have thought of that". I truly believe that stress is a great potion for extra XP. Heck, some of my best work has been done under a deadline induced panic.
Teamwork - I find it extremely valuable to handle business critical jobs as if it was a tag team wrestling. I was skeptical when I first heard this. Thinking that a single developer would be more efficient if he focus on one thing and did it right. But boy was I ignorant of the alternative. Here is an example. Feature B has to done by certain day, size and complexity of the feature is arbitrary. Rather than assign to a single dev, its broken up into chunks, and spread out. This allows for fantastic teamwork, albeit a lot of technical fights about the best methodologies and such, but this is as healthy as it gets.
Repetition - This important. No matter the material it will not be learned first or second time around. Its only through countless trials and errors that I and the team really understand something. Example. Laravel, a fantastic PHP framework. When we began using it, we built 6 mock applications, 4 of which where the same thing just built differently before everyone felt hella comfortable using it. And like magic, the thing we were actually supposed to build with Laravel was done 40% faster than projected. and a lot better too.
