97% Of Redis EXPLAINED In 10 Minutes | Ex- Google, Amazon
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Most developers think Redis is just a cache but that barely scratches the surface of what it can do.
In real production systems, Redis is used to store user sessions, build live leaderboards, limit API requests, coordinate distributed jobs, power real-time messaging, and protect databases during sudden traffic spikes.
In this video, I break down how Redis works, why its single-threaded architecture makes it surprisingly fast, the most important patterns developers build with it, and the trade-offs you need to understand for system design interviews and real-world engineering.
💡 Here’s what you’ll learn:
✅ Redis fundamentals — why it is a data structure server, not merely a cache
✅ In-memory performance — how Redis achieves sub-millisecond response times
✅ Single-threaded architecture — why sequential command execution can improve speed and atomicity
✅ Caching — how cache-aside, TTLs, eviction policies, and cache stampedes work
✅ Rate limiting — how atomic counters control API request volume
✅ Leaderboards — how sorted sets maintain live rankings efficiently
✅ Session storage — how shared sessions work across multiple application servers
✅ Distributed locks — how Redis coordinates workers and prevents duplicate jobs
✅ Real-time messaging — when to use Pub/Sub versus Redis Streams
✅ Persistence — the differences between RDB snapshots and AOF
✅ Scaling — how replicas, sharding, Redis Cluster, and hot keys affect architecture
👋 about me
I’m Maddy, a senior software engineer (prev. at Google), with prior internships at Amazon, IBM, and Microsoft. Sharing my journey here—thanks for watching 🤍
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📖 Timestamps
0:00 Redis Is More Than a Cache
1:41 Why Redis Is So Fast
3:59 Reasons why Redis Is Fast
5:33 Pattern 1
6:21 Pattern 2
6:38 Pattern 3
7:03 Pattern 4
7:27 Pattern 5
8:05 Pattern 6
8:33 Redis Persistence: RDB vs AOF
9:31 Scaling Redis
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*Disclaimer: Views are entirely my own and do not represent any current or past employer(s).
@GensparkProduct for sponsoring this part of the video.
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