Q21. How do you implement safe rollbacks in a delivery pipeline?
Make rollback a first-class, automated, and tested operation. - Immutable artefacts: deploy versioned images or packages so you can redeploy the previous one exactly. - D...
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Job Interview Questions and Answers Directory
Search and filter frequently asked interview questions across technical, programming, and behavioral domains. Tailor your interview preparation by difficulty for freshers or experienced developers (34 available).
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Q22. How do you manage background processes and signals?
Bash can start, inspect and signal processes. Append `&` to run a job in the background and `$!` holds its PID. `wait` blocks until it finishes. ```bash sleep 30 & pid=$!...
Q23. How do you align engineering, design and business stakeholders?
I align people through a shared, visible goal and a clear decision making process, not through endless meetings. I start by understanding what each group cares about. Eng...
Q24. How do you handle a prospect who goes silent after a demo?
Silence usually means something changed, not that they dislike me. I do not flood their inbox. First I send a short, low pressure note that gives them an easy way to repl...
Q25. How does error handling work in GraphQL?
GraphQL usually returns HTTP 200 with a JSON body containing `data` and/or `errors`, because a single operation can partially succeed across fields. ```json { "data": { "...
Q26. What are the most common JWT security pitfalls?
- Accepting the `none` algorithm or trusting the token header for algorithm selection, which enables algorithm confusion attacks. Pin the expected algorithm server-side. ...
Q27. How do you build and analyse a JavaScript library bundle?
Library builds differ from app builds: you usually bundle to ESM and CommonJS, externalise peer dependencies such as React or Vue so consumers do not get duplicates, gene...
Q28. Explain register allocation in a compiler.
Register allocation assigns the many virtual registers produced by the compiler to the small, fixed set of physical CPU registers. It happens late, after instruction sele...
Q29. How do you tell a compelling data story to stakeholders?
Start with the decision the audience needs to make, then structure the narrative around it: situation, complication, question and answer. Lead with the recommendation and...
Q30. How do you model a one-to-many relationship in MongoDB?
The answer depends on the size of the "many" side and the access pattern. One-to-few: embed an array of subdocuments. A user with a handful of addresses embeds them, so o...