IntermediateBEHAVIORAL
Tell me about a time you mentored a junior developer on a full‑stack feature (from UI through API to database). What specific guidance did you give, how did you ensure they learned rather than just followed instructions, and what was the outcome?
Full Stack Developer
General

Sample Answer

On my last team, I mentored a junior dev on a small but real feature: adding a “saved filters” panel to our analytics dashboard used by about 4,000 monthly users. Instead of handing him a solution, we whiteboarded the flow together: React UI changes, a new REST endpoint, and a small Postgres table for storing filters per user. I had him draft the API contract first, then we reviewed it live, talking through versioning, validation, and error shapes. On the front end, I paired with him for the first component, then asked him to implement the rest and come back with questions. For the database, I asked him to propose the schema and indexes and justify them. We shipped the feature in one sprint, and it cut common filter setup time by ~30%. More importantly, his next feature required half as much guidance, and he started doing his own end‑to‑end designs that passed review with minimal comments.

Keywords

Mentored junior on an end-to-end feature with real user impactGuided through API design, UI, and database schema instead of giving answersUsed whiteboarding, live reviews, and independent work to reinforce learningResulted in shipped feature plus clear growth in junior’s autonomy
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