lrnitFor software engineers

Learn system design in a course built only for you — and actually retain it.

The structured approach to system design interviews: requirements, capacity estimation, component trade-offs, and narrating your reasoning like a senior engineer.

Free to start · no account needed

Built around your goal — not a catalog

What your course could open with

lrnit interviews you first — what you know, why you’re learning, how you think — then generates every lesson for that. Sample lessons from a course like yours:

01The interview algorithm: requirements → estimates → design → deep-dive
02Back-of-envelope math: QPS, storage, and bandwidth in 90 seconds
03Caching, sharding, queues: the trade-off vocabulary of every design round
04Mock round: design a URL shortener, then defend every box you drew
…and the rest is generated for you: your gaps, your pace, your job.

Measured, not watched

By the end, you’ll be able to

Run a structured 45-minute design discussion under pressure
Do capacity estimation quickly and credibly
Defend architectural trade-offs instead of name-dropping components

Every lesson ends in assessment. Mastery is tracked per concept with spaced review, and the course adapts to what you actually retain — finishing means a timed final exam and a verifiable certificate, not a completion badge.

“It felt like the course already knew what I did for a living.”

Early lrnit learner

Your version of this course doesn’t exist yet.

Free to start · no account needed