HeyJaredHands-on System Design with Java Spring Boot
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
- Indexed issues, last 90 days
- 17
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- Sep 30, 2026
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- Aug 19, 2026
Latest issues
Week 10: Management, Security & Testing (Days 46–50) (opens the original)
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Build a Secure Scheduler Control PlaneA timer is not an operations product. The moment several teams depend on scheduled work, people need to answer four questions safely: what is configured, what ran, who may change it, and what happens when coordination breaks? This lesson turns those questions into one integrated control plane.You will build a Spring Boot service with a persisted task registry, ad-hoc triggering, searchable execution history, a professional web console, role-based access, dat
Day 74: Region Selection - Geography Gets You Close, Measurement Gets You Right (opens the original)
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The Spring Boot TrapThe naive version of this feature is a lookup table. Resolve the user’s IP to a country or city with a GeoIP database, match it against a static map of region -> nearest voice datacenter, done. It’s fast, it’s simple, and it’s exactly the kind of thing that looks finished in a demo with three users in the same city as the engineer who built it.It falls apart the moment real geography and real network topology disagree, which is often. Singapore and Jakarta are close on a map
Day 73: DTLS/SRTP - Encrypting Voice Without Trusting a Certificate Authority (opens the original)
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The Spring Boot TrapThe framework instinct here is to reach for SSLContext.getDefault(), wrap a socket, and call it done — the same TLS you’d use for an HTTPS endpoint, because “it’s just encryption, right?” It isn’t. TLS runs over TCP; RTP runs over UDP, and voice can’t tolerate TCP’s retransmission-and-reorder guarantees — a retransmitted audio packet arriving 200ms late is worse than a dropped one. And the part almost everyone gets wrong on the first pass: WebRTC’s DTLS-SRTP model doesn’t use
Week 9: Observability & Monitoring (Days 41–45) (opens the original)
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Build an Observable Task SchedulerA scheduler that runs jobs but cannot explain itself is not production-ready. This project adds an evidence plane beside the execution plane: every run produces a durable state change, a structured event, and a metric. Those signals answer different questions. The database answers “what happened to execution 8af2…?” Metrics answer “is the failure rate rising?” Logs answer “what context explains this failure?”What you will buildYou will build one Spring Boot serv
Day 72: Video Simulcast - Three Qualities, One Encode Cost (opens the original)
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The Spring Boot TrapThe instinct here comes from HTTP video streaming, where adaptive bitrate (HLS, DASH) genuinely does involve a server generating multiple renditions of the same content. So the junior move for live video looks the same: receive one high-quality stream from the publisher, and for any subscriber whose connection can’t handle it, decode the incoming VP8/H.264 frames, scale the image down, re-encode at a lower bitrate, and forward that. It’s the same mental model as ffmpeg transc
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