technical
PostgreSQL deep-dive interviews — far beyond generic SQL. MVCC, vacuum, index types (B-tree, GIN, GiST, BRIN), query plans, and the production-tuning knobs that matter when your tables grow into the billions.
Sample questions
These are the kinds of questions you'll drill. Real mock rounds will generate many more — tailored to the exact JD you paste in.
Explain MVCC and why long-running transactions can bloat your tables.
When would you reach for a GIN index over a B-tree, and what's the trade-off?
A query is fast in dev but slow in prod — walk me through your diagnosis with EXPLAIN ANALYZE.
How does Postgres handle replication, and what's the difference between physical and logical replication?
Walk me through a strategy for online schema changes on a 500M-row table without downtime.
Reading PostgreSQL questions isn't the same as answering them live. You need the rep — the pause, the clarifying question, the moment where you realize you forgot the framework. We put you in that exact spot, then show you what a strong answer would have looked like.
Related topics
React
Hooks, rendering, and real-world patterns.
System Design
Scale, trade-offs, and clear reasoning.
SQL
Joins, indexes, and query plans.
Data Structures & Algorithms
Arrays, graphs, trees, and the classics.
Behavioural
STAR answers that actually land.
Leadership
Influence without authority, grown-up feedback.
Paste the JD, pick your topics, and go. Full session, full feedback, no fluff.
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