LearnThatStack Ace your next interview
ALL All refreshers · Now live

Minutes, not hours. One concept.

The whole refresher library, back to back - System Design, API Design.

9
Videos
44 min
Total runtime
4 / 5
Free / Pro
SY

System Design

6 videos · 23 min

System design concepts that show up in every system design interview. From CAP to consistent hashing - what it is, when it bites, how to talk about it.

AP

API Design

3 videos · 21 min

API design topics covering most core concepts/topics like auth, versioning, idempotency, error contracts, rate limits and more - and the API ergonomics interviewers expect you to understand.

01 / 03 · 6:01

What REST Actually Is

REST is not "JSON over HTTP." It's a set of architectural constraints and most APIs people call REST don't actually satisfy all of them.

Watch all 9 with Pro · $10/mo
4 refreshers free for everyone. Subscribe to Pro, cancel anytime.
Try Pro
Coming next

More topics, on the way.

One waitlist for the whole roadmap - we'll ping you the day any new topic ships. No spam, no upsell.

DB

Database Design

Building now

Videos covering the core database concepts and topics that interviewers usually probe: indexes, query plans, isolation, replication, sharding and more

DS

Distributed Systems

Q4 2026

Quorums, Paxos/Raft intuitions, vector clocks, gossip - the building blocks behind every distributed system question.

FP

Frontend Performance

Q4 2026

Web vitals, render-blocking resources, hydration cost, image strategy - the levers that move real Lighthouse scores.

AU

Auth & Identity

Q3 2026

Session vs JWT tradeoffs, OAuth2/OIDC flows, refresh strategies, and the most common security footguns to talk about.

Done watching?

Test yourself with 6600+ questions.

Now that the concepts are fresh, drill the questions that interviewers actually ask. Free preview on every question; Pro unlocks the full library.