Part 9 of 10 of Building Instagram's Authentication Backend . If you're just joining, the repo is here and you can catch the earlier parts on the YouTube playlist . Eight parts of code, zero runs By the end of part 8, every layer of this backend existed: DTOs, exceptions, entities, repositories, five services, a security filter chain and a controller. And I had never started the application. Not once. Everything so far was code I'd reasoned through and believed would work. This part is where that belief gets tested. We containerize the app, put Postgres, Redis and a fake mail server next to it, and bring all four up with one command. It did not work the first time, so this post is the real debugging session, with each bug, its symptom and its fix. If you're containerizing your own Spring Boot app, there's a good chance you'll hit at least one of these. In this post: A multi-stage Dockerfile for Spring Boot, line by line A docker-compose.yml ...
B.Tech CS/IT Roadmap 2026: A Clear 4-Year Plan From Someone Who's Still in the Game Career Guide · Opinion · ~14 min read · Updated for 2026 I'm going to skip the usual motivational opener. No "you're not late," no "believe in yourself" — you've heard that a hundred times and it hasn't helped. Instead, let me tell you what actually happened to me. I did my B.Tech, got a job as a Java developer, and spent years building backend systems in production — Spring Boot, Oracle, microservices, the whole stack. I eventually became a Tech Lead. And then, years into my career, I went back to school. I'm currently doing an M.Tech from BITS Pilani (WILP programme), studying mathematical foundations, data structures, and computer organisation — while working full-time and running a YouTube channel . Why am I telling you this? Because the roadmap I'm about to give you isn't based on what I read online. It's...
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