Interview Prep

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

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C# / .NET

Junior

Tell me about a time you worked through a difficult bug or exception
Behavioural Frequent debugging concurrency async
Tell me about a time you explained a technical decision to a non-technical stakeholder
Behavioural Frequent C# communication STAR method

Mid-level

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

Senior

Describe a significant architectural decision you made under uncertainty
Behavioural Occasional architecture microservices tech debt

System Design

Describe how you would approach a high-stakes technical decision with significant uncertainty
Behavioural Frequent C# architecture ADR

Python

Junior

Tell me about a bug that was hard to find and how you debugged it
Behavioural Frequent Python debugging Celery

Mid-level

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

Senior

Describe leading a major refactor in a Python codebase — how you managed risk and team buy-in
Behavioural Frequent Python refactoring mypy

System Design

Describe a time you drove a critical technical decision at the system architecture level
Behavioural Frequent Python ML serving Ray Serve

Go

Junior

Tell me about a time you had to quickly learn a new tool or language to deliver something
Behavioural Frequent Go learning STAR method

Mid-level

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

Senior

Tell me about a significant architectural trade-off you made in a Go service
Behavioural Frequent Go architecture performance

System Design

Describe a time you led a significant technical initiative — architecture, delivery, and trade-offs
Behavioural Frequent Go technical leadership migration