Pennylane (France) interview questions

The interview process is well-structured and straightforward: a screening call with HR, a take-home assignment, a technical debrief where the engineering team challenges your architecture, and finally a cultural fit interview. Each step is well-organized and the architectural discussion was genuinely substantive. My one reservation is the honesty of the final outcome. My take-home was described as one of the best they had seen in a while, and I cleared the technical debrief without issue. Therefore it was rejected at the cultural fit stage on grounds vague enough that I couldn't identify what actually disqualified me. I'd rather receive a clear 'no' with real reasons than feedback that feels manufactured. Candidates investing significant time in a take-home deserve transparency at the exit.

Process spanned over two months. The recruiter was friendly and helpful, as well as the senior engineer I met for the technical debrief. However, that debrief was focused around UX, very little concerns were expressed for backend architecture. Using vector search for similarity over natural language was considered overkill. Overall, I felt the discussion and concessions made during that exchange didn't go into considerations at all, and that the decision was kind of made up already. If you give it a try, prepare yourself as a product engineer with data analyst skills, not just a senior backend. Assignment is more about "showreel" rather than systems design.