PinnedInLet’s Code FuturebyArchitecture Unfiltered·Dec 28, 2025Microservices Killed Our Startup. Monoliths Would’ve Saved UsThe architecture decision that looked brilliant on whiteboards and destroyed us in productionA response icon7A response icon7
Architecture Unfiltered·6h ago66 Advanced Software Engineering Problems You Should Know Before Your Next InterviewAn engineering field guide to production failures, distributed systems, Java, Spring Boot, PostgreSQL, Kubernetes, AI infrastructure, and…
InEngineering Under PressurebyArchitecture Unfiltered·1d agoWe Switched to Java 21 Virtual Threads. Our p99 Latency Got 4 Times WorseThe load test showed more requests per second, so we shipped it. Two days later, our Spring Boot API had twice as many timeouts and a…
InEngineering Under PressurebyArchitecture Unfiltered·3d agoA Principal Java Engineer Removed Every Lock. His Code Passed 10 Million Tests and Still Lost DataHe knew the Java Memory Model, CAS, VarHandles, and CPU cache coherence. Then an interviewer gave him a lock-free queue that worked for…
InEngineering Under PressurebyArchitecture Unfiltered·3d agoHe Built a Database That Never Lost a Write. Then a Snapshot Deleted Six Hours of HistoryOur Principal Engineer candidate knew RocksDB, LSM trees, WAL recovery, and compaction. He had spent twelve years building storage systems…
InEngineering Under PressurebyArchitecture Unfiltered·3d agoWe Gave a Principal Engineer 800 TB of Data and Told Her to Change Its Primary KeyNo maintenance window. No customer downtime. No lost writes. Six years of production data, 140 microservices, and a database schema that…
InEngineering Under PressurebyArchitecture Unfiltered·3d agoWe Asked a Principal Engineer to Move $50 Million. He Couldn’t Prove Where It WentHis architecture had Kafka, PostgreSQL, a transaction coordinator, and five independent services. Everything looked production-ready until…
InEngineering Under PressurebyArchitecture Unfiltered·3d agoHe Designed a Multi-Region Database in 45 Minutes. Then We Asked Which Write SurvivedThe candidate had spent fifteen years building distributed systems. He understood Raft, consensus, replication, and failure detection. His…
InEngineering Under PressurebyArchitecture Unfiltered·3d agoA Staff Engineer Candidate Designed a Perfect Rate Limiter. One Clock Skew Question Broke ItHe had built API gateways, managed billions of requests, and could explain every Redis data structure. Then an interviewer moved one server…
InEngineering Under PressurebyArchitecture Unfiltered·3d agoRedis Cache Stampede: Why Your Database Crashes When the Cache ExpiresYour Redis cluster is healthy. Your PostgreSQL database is healthy. One expired cache key takes down both applications.
