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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.

03 / 03 · 9:09

HTTP Status Codes Your API Actually Needs

This video walks through the common HTTP status codes that do most of the work in API design, explains the pairs developers constantly mix up (401 vs 403, 400 vs 422), shows how to structure error bodies that actually help someone debug, and names the two anti-patterns that can s

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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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