Interview Prep

Real questions for real interviews. C#, Python, Go, SQL. Junior → System Design.

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SQL

Junior

Tell me about a time you had to debug a slow or incorrect SQL query.
Behavioural Frequent SQL performance debugging

Mid-level

Describe a time you designed a database schema from scratch for a new feature.
Behavioural Frequent SQL schema design normalisation

Senior

Tell me about a time you significantly improved database performance in production.
Behavioural Frequent SQL performance PostgreSQL

System Design

Describe leading a database migration project with zero downtime.
Behavioural Frequent SQL database migration zero downtime