Learning Paths
Not sure where to start? A path is a hand-ordered track of subjects — learn, practise, and prove it with a quiz, one step at a time.
Backend Fundamentals
Start here. A hand-picked path through the core ideas every backend engineer needs — how large systems scale, how databases stay fast, and how programs do many things at once. Free to start, designed to give you a real win.
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System Design Interview
The exact sequence to prepare for a system design interview: fundamentals first, then the building blocks interviewers expect you to reason about — load balancing, consistent hashing, the CAP theorem, and database indexing.
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