Who is this guide for?
In short: everyone.
The same principles helped me advance from junior to senior as well as from lead to VP. They will help you, too, no matter if you are:
A fresh coding bootcamp graduate, not sure how to kickstart your career.
A junior, looking to build a solid foundation and "level up" for the first time.
A mid-level or early senior, with ambitions to become a well-rounded expert.
A seasoned senior, ready to take your career even further, to the staff or management level.
A staff or principal-level veteran, struggling to keep your skills fresh, stay relevant, and avoid a plateau.
...or just curious where you stand and how complete is your skillset.
No matter what's your next step, this guide will help you get there faster.