Design systems that survive real traffic.
Move from requirements to trade-offs: APIs, data models, storage, queues, caching, observability and failure recovery.
Open AlgoGalaxy Software Architecture
URL Shortener
Start with an interview-sized system and reason through ID generation, redirects, storage, cache-aside and reliability.
Open on AlgoGalaxyStudy modules
Use these substantive subjects as a preparation track, then return to CodeRush to make the ideas executable.
Chat Application
Model presence, real-time delivery, ordering and scale-out for a WhatsApp or Slack-style system.
YouTube Design
Work through uploads, transcode pipelines, CDN delivery and recommendation-oriented reads.
Instagram Design
Practice feed fan-out, media processing, engagement models and privacy-aware delivery.
Uber Design
Think through geo-indexing, matching, trip state and location updates under load.
Netflix Design
Explore global video delivery, catalog reads, reliability and personalized discovery.
System Design Core
Build a reusable vocabulary for load balancing, databases, caching and distributed trade-offs.
One deep loop, not scattered tabs.
Clarify the users, scale and non-functional requirements.
Sketch the API, data path and failure boundaries before choosing infrastructure.
Defend the trade-offs: latency, cost, consistency and operability.