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Networking and APIs · designlab

Dashboard Learn Handbook Labs Practice library Learning paths Review Insights Studios Mock interviews Notebook

Part 1 · Module 4

Networking and APIs

What happens between a click and your server, how to design APIs other people can rely on, and which protocol to pick for which job.

0 of 4 lessons25 min

4.1How a request travelsUp next7m
4.2REST APIs done well7m
4.3gRPC, GraphQL and choosing a style5m
4.4Polling, SSE and WebSockets6m
LabWhere's my lunch?Finish “Size Tiffin for a city” first30m

Practice what this module teaches

URL Shortener HLDTurn long URLs into short links. Keep redirects fast when a link goes viral.Foundation35 min API Gateway HLDRoute requests with authentication, quotas and bounded downstream failure handling.Intermediate45 min Webhook Delivery

HLD

Deliver signed events with retries, endpoint isolation and replayable delivery history.

Advanced50 min

Chat Service HLDDeliver ordered conversations across devices, reconnects and offline recipients.Intermediate45 min

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