Stay up to date with practical insights on backend engineering, system design, and building reliable software.
Most Ruby developers know symbols are "faster" than strings, but few can explain exactly why or when the difference is worth caring about. Here's where it genuinely matters at scale.
Read moreRate limiting protects APIs from abuse, enforces fair usage, and prevents accidental runaway clients from taking down infrastructure. Here is how to implement per-user, per-IP, and per-endpoint rate limiting in Spring Boot with Bucket4j and Redis.
Read moreYou offered SEK 70K a month and got ghosted. You offered SEK 75K and got a maybe. Meanwhile, Klarna and Spotify aren't even flinching at those numbers.
Read moreRequest specs in Rails test the full stack efficiently, but most teams either over-test at the wrong layer or under-test the cases that matter. Here is the structure that finds real bugs without slowing the suite down.
Read moreH2 in-memory databases don't catch PostgreSQL-specific bugs. Mocked message brokers don't verify producer and consumer integration. Testcontainers runs real infrastructure in Docker during tests, eliminating the gap between what passes locally and what breaks in production.
Read more