Top 3 Feature flags Interview Questions
Browse 3 real-world technical and behavioral interview questions about Feature flags. Review scenarios, edge cases, and architectural best practices.
Design an experimentation and feature-flag platform: assignment, exposure logging and a kill switch.
Evaluate feature flags in an SDK from a cached ruleset, assign users by hashing a per-experiment salt with the user id so assignment is sticky, log exposure where the arms first diverge, gate readouts on an automated SRM check, and make the kill switch a top-precedence rule that works with the control plane down.
How would you design a deployment pipeline that can be rolled back safely?
Build one immutable artefact, promote that same artefact through environments behind ordered quality gates, and deploy so traffic can be shifted back instantly. Rollback only stays possible if schema changes are backward-compatible expand-contract steps decoupled from the code deploy.
Your pipeline gates every code change. What else reaches production without passing through it?
Configuration, feature flags, content and reference data, schema migrations, infrastructure definitions and dependency updates all change production behaviour, and most organisations ship them through channels that were designed to be faster than the release pipeline.