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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.

01 / 06 · 3:21

Design vs Architecture

Most developers vaguely think architecture = high-level, design = low-level. Is choosing a database architecture or design? What about a caching strategy? In this video, you'll learn the practical definition that actually helps you make decisions.

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.

02 / 03 · 6:02

HTTP Methods Are Not CRUD

You'll learn how HTTP classifies every method on two axes (safety and idempotency), what each method actually guarantees, why PUT and POST differ at a deeper level than most tutorials explain, and how idempotency keys solve the retry problem for POST.

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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.

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