Summaries of an interview format the employer published itself. The format is documented; the exact prompts you get will differ. Answer aloud and state your assumptions before you open the guide; guides are editorial suggestions, not official answer keys.
Q07, Sierra engineering, Product & build
Define a product in a domain you know, build it using your chosen AI tools, then demonstrate and defend it.
Sierra describes a plan/build/review onsite with a two-hour build. This is a published format, not a fixed question; the current recruiting process may differ.
Choose a narrow user problem, show the main flow, explain scope cuts, inspect generated code, and describe what must change before production.
Follow-up to expect: Which model-generated change did you reject, and what evidence led you there?
Q08, Sierra engineering, Debugging
Review and improve a draft change that introduces a cross-cutting feature in an existing codebase.
Sierra describes this as a debugging-interview pilot, not a confirmed universal stage. No original codebase is provided.
Reproduce the behavior, trace affected boundaries, find the smallest responsible fix, and check regressions. Explain both the code change and its user impact.
Follow-up to expect: What would you inspect before trusting an AI-generated patch?