Sample Answer
(S) We had a legacy billing module written in a mix of old frameworks and raw SQL, responsible for ~40% of our revenue. It was hard to maintain and had frequent regressions. (T) I was asked to refactor key parts to improve reliability and test coverage without disrupting monthly billing. (A) I started by mapping critical flows and adding monitoring around them (error rates, processing times, and volume metrics). Then I introduced characterization tests around existing behavior, using real anonymized production data, which increased test coverage from ~8% to ~55%. I refactored in small steps: extracting pure functions, centralizing SQL queries into a repository layer, and adding feature flags to switch between old and new paths. Each change was deployed behind a flag and validated with canary releases, comparing metrics like failure rate and processing time. (R) Over three months, we reduced billing-related incidents by ~70%, improved average job processing time by ~30%, and cut hotfixes by half. The module became much easier to extend for new pricing plans.
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?
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.
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.
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?