How do you implement feature flags in .NET?
PICTURE THIS: OOP PILLARS
Simple meaning
Microsoft.FeatureManagement or LaunchDarkly-style services toggle code paths.
WHY — Architecture instead of guessing?
Why interviewers care about Architecture:
question about Architecture.
trade-offs, and what you would actually do on a .NET project - not buzzwords.
Name the idea, why it exists, then one short example.
End with when you use it and one common pitfall.
STEPS — What happens step by step?
Before you speak the answer, walk the interviewer through these steps:
- 1Microsoft.FeatureManagement or LaunchDarkly-style services
toggle code paths.
- 2Flags need cleanup after
full rollout.
- 3I keep flags out
of tight loops when possible.
- 4Give an example
One tiny concrete case you can say aloud.
- 5Common mistake
What juniors usually get wrong.
- 6Close
When you pick this over the alternative.
EXAMPLE — See it in action
Here's a short line you can speak, broken into clear beats:
Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.
Key takeaway
Microsoft.FeatureManagement or LaunchDarkly-style services toggle code paths. Flags need cleanup after full rollout.