This course provides an in-depth, hands-on journey into designing and implementing ultra-scalable task schedulers using Java Spring Boot. You will learn every core system design concept, explore diverse use cases, and gain practical experience
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Day 73: DTLS/SRTP - Encrypting Voice Without Trusting a Certificate Authority
Every voice packet this course has built so far has traveled in the clear. Anyone on the same Wi-Fi, the same ISP link, the same compromised router, could read the RTP payload of every lesson from Day
The Spring Boot Trap
Week 9: Observability & Monitoring (Days 41–45)
Build an Observable Task Scheduler
Build an Observable Task Scheduler
Day 72: Video Simulcast - Three Qualities, One Encode Cost
A 720p video stream at 30fps costs somewhere around 1,500 kbps. Now imagine a viewer on a train with 400 kbps of real bandwidth trying to watch it. Something has to give, and the naive answer — have t
The Spring Boot Trap
Day 71: Opcode 5 (Speaking) - Broadcasting a Green Ring Without Melting the Gateway
A 30-person voice channel with 10 people talking generates 500 audio packets a second. If you broadcast a “speaking” event for every one of those packets to every one of the 30 listeners, you’ve just
The Spring Boot Trap
Day 70: Speaking Indicators — Parsing RTP Header Extensions Without Touching Audio
The Spring Boot Trap
Here’s the naive plan, and I’ve watched three different junior engineers propose some version of it. RTP packets arrive at your SFU — 50 bytes of header, 160 bytes of Opus-encoded audio, 50 times a second, per par...
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