Build Discord from Scratch: WebSockets, Distributed Systems & Real-Time Architecture at Scale .
Are you stuck in tutorial hell — building chat apps that break at 10 users? This hands-on system design course teaches you to engineer the real-time, distributed platform powering Discord, Slack, and Telegram from the ground up. Over 90 days you'll build "Flux" — a production-grade, sharded chat and voice platform — covering the exact architecture patterns top engineers use at scale: persistent WebSockets, consistent hashing rings, Pub/Sub fan-out with Redis Streams, wide-column database modeling in ScyllaDB, Snowflake ID generation, WebRTC voice signaling via SFU, distributed rate limiting with Redis Lua scripts, and the Thundering Herd problem. Whether you're a software engineer preparing for a system design interview at FAANG, a backend developer aiming to transition into distributed systems, or a computer science grad tired of toy apps, this course closes the gap between "I watched the video" and "I built it in production." Every lesson is hands-on Java code — no slides, no theory dumps — so by Day 90 you don't just know what consistent hashing is, you've implemented it under load. If you're searching for the best system design course, scalable backend architecture tutorials, microservices design patterns, or real-time systems engineering, this is where tutorial hell ends and production engineering begins.
📌 Course link: https://systemdrd.com/courses/hands-o... | 🌐 systemdrd.com
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system design interview, distributed systems tutorial, backend engineering course, WebSocket at scale, real-time system architecture