Data Engineer interview at Facebook: unclear bookstore scenario

After a recruiter screen, I went into a technical conversation that felt tougher than the preparation materials. The difficulty was not only coding or SQL. A scenario resembling a bookstore checkout system was described too vaguely for me to know the intended behavior, and the interviewer did not help clarify it. Once I understood what to build, I worked through it, but the experience still felt…

Shared by a candidate · reported Jul 2026. Interview formats change; use it as a guide, not a script.