Interview Prep

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

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C# / .NET

Mid-level

Tell me about a time you significantly improved the performance of a system
Behavioural Very frequent C# performance profiling

Python

Mid-level

Tell me about a time you optimised a slow Python service in production
Behavioural Very frequent Python performance profiling

Go

Mid-level

Tell me about a time you improved the reliability or performance of a production system
Behavioural Frequent Go performance profiling

SQL

Mid-level

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