# Learning Real-World Performance Skills from SQL & PostgreSQL Interview Experiences

I recently completed a series of interviews for engineering roles, and one key theme stood out: **SQL and PostgreSQL aren’t just about writing queries — they’re about knowing how data systems work under pressure.**

On my main blog, I broke down:

* The exact SQL problems I was asked (recursive queries, windowing, multi-level filtering)
    
* Advanced PostgreSQL internals, like execution plans, sharding design, and logical replication
    
* Real discussions around performance bottlenecks, indexing decisions, and CDC strategies
    

🎯 Whether you’re prepping for a systems-heavy role or improving your Postgres stack, this walkthrough will help.

[👉 Read the full post here](https://kiransabne.dev/cracking-the-sql-interview-real-questions-and-postgresql-internals-you-should-know)