Graph databases find connections. Vector databases find similarities. When to use which, real benchmarks, and why PostgreSQL might replace both.
In 2005, "software engineer" meant one thing. In 2026, there are 20+ titles. Which splits are real and which are hype?
RAG tutorials teach the easy 20%. Here are the five production problems they skip — and how to actually solve them.
One writes SQL at 2 AM. The other rewrites the requirements doc at 2 AM. Both make $90K+. Here is how to pick.
The real difference between correlated and non-correlated subqueries, with benchmarks, optimizer behavior, and the NOT IN NULL trap.
iOS job postings dropped 60% but median pay hit $188K. Here's the practical roadmap that accounts for how hiring actually works.
Redis is not just a cache. Sorted sets, streams, pub/sub, and HyperLogLog changed how I architect everything.
Docker has 200+ commands. You need about 15. The commands, Compose setup, and Dockerfile patterns that cover 99% of solo dev work.
I replaced GPT-4 with 7B models in production. Same quality, 95% cheaper. Here is why small language models are winning.
How I killed a 2,400-line Python ETL pipeline and replaced it with 300 lines of SQL using CTEs, materialized views, and pg_cron.