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

11
Videos
57 min
Watch time
4 / 7
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

5 videos · 35 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.

04 / 05 · 7:49

API Authentication - Keys, JWTs, and OAuth

This video walks through the four authentication mechanisms that matter for APIs: Basic auth, API keys, JSON Web Tokens, and OAuth 2.0. We start with the distinction between authentication vs authorization - then discuss each mechanism, its tradeoffs, and when to use it.

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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

Coming soon

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

FP

Frontend Performance

Coming soon

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

AU

Auth & Identity

Coming soon

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

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