Interesting interview questions

(𝐀𝐧𝐠𝐮𝐥𝐚𝐫 + .𝐍𝐄𝐓 + 𝐀𝐳𝐮𝐫𝐞 + 𝐃𝐞𝐯𝐎𝐩𝐬) -

𝟏. 𝐀𝐧𝐠𝐮𝐥𝐚𝐫 / 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝

• How do you prevent memory leaks with Observables?
• Template-driven vs Reactive forms — when to use which?
• Why use trackBy in *ngFor and what happens if you skip it?
• What are Subjects vs BehaviorSubjects vs ReplaySubjects?
• How do you optimize Angular for performance in production?

𝟐. .𝐍𝐄𝐓 / 𝐂#

• Async/await pitfalls — what happens if you call .Result inside async code?
• Dependency Injection lifetimes (Singleton vs Scoped vs Transient) — how can the wrong choice break your app?
• How do you avoid N+1 queries in EF Core?
• Middleware ordering in ASP.NET Core — why does it matter?
• How would you set up global exception handling for Web API?

𝟑. 𝐀𝐳𝐮𝐫𝐞 / 𝐂𝐥𝐨𝐮𝐝

• How do you store secrets securely (Key Vault vs Managed Identity)?
• Why does your Angular app fail to call APIs from Azure — what do you check first?
• How do you scale App Service under heavy load?
• Application Insights — why is it critical for production apps?

𝟒. 𝐃𝐞𝐯𝐎𝐩𝐬 / 𝐂𝐈-𝐂𝐃

• Handling secrets in pipelines securely.
• Debugging broken pipeline YAMLs.
• Difference between build vs release pipeline.
• Rolling back a failed deployment.
• Managing environment-specific configs in Docker.

𝟓. 𝐑𝐞𝐚𝐥-𝐖𝐨𝐫𝐥𝐝 𝐒𝐜𝐞𝐧𝐚𝐫𝐢𝐨𝐬

• Angular works locally but not after Azure deployment — where do you start debugging?
• API works in Postman but not from Angular — what’s your checklist?
• App slows down with more users — what do you check first?
• How do you connect logging and monitoring across Angular + .NET + Azure?