Sample Answer
In my last role, I owned auth for a B2B SaaS platform with about 80k monthly active users. We moved from legacy session-based auth to a stateless JWT + OAuth2 model. Public APIs used OAuth2 client credentials, while the web app used short-lived access tokens (15 minutes) plus refresh tokens stored in HttpOnly, Secure cookies. To handle expiry and refresh, I implemented a refresh endpoint with rotation: every refresh returns a new refresh token and invalidates the old one in Redis, which let us support “log out from all devices” and immediate revocation for compromised accounts. We also added a token blacklist with a 24-hour TTL for edge cases. For sensitive endpoints (payments, exporting data), I required additional checks: recent password re-entry or WebAuthn, IP and device fingerprint checks, and strict role/permission checks at the service layer. We also enforced least-privilege scopes on OAuth clients and added rate limiting per token to reduce abuse.
Keywords
Based on your hydrology and irrigation engineering background, explain how you would estimate the irrigation water requirement for a kharif crop in a semi-arid region of Gujarat. Walk me through each step: from reference evapotranspiration estimation, crop coefficient selection, effective rainfall calculation, to arriving at canal discharge for a given command area.
In your civil engineering studies, what specific design coursework or project work did you complete related to irrigation channels or canals (e.g., design of lined/unlined canals, distributaries, minors)? Describe one such design in detail, including how you determined discharge, permissible velocity, section dimensions, and lining choice for Gujarat-type soil and climate conditions.
Walk me through a recent multi-channel digital marketing campaign you managed end-to-end. How did you set objectives, choose channels, allocate budget, and measure success?
In your resume you note improving or optimizing [a process, KPI, or metric]. What specific baseline metrics did you start from, what steps did you personally take, and how did you verify that the improvement was due to your changes rather than external factors?
On your resume you mention working on a cross-functional project (e.g., involving multiple teams or stakeholders). Describe a situation from that project where priorities conflicted—how did you navigate the trade-offs and what was the final outcome?