Cracking Meta's Software Engineer Interview: Debugging Transformers & RAG System Design

Meta | Software Engineer | Interview Experience

Interview Date: November 2025
Result: Not specified
Difficulty: Not specified

Interview Process

The interview consisted of two rounds: a coding round and an AI design round. The coding round involved debugging a transformer model, with five specific areas indicated in the comments for review. Familiarity with Nano GPT was helpful, and a follow-up question focused on key-value (KV) caching. The AI design round required designing a retrieval-augmented generation (RAG) system, where each component was discussed, and the candidate was asked how to evaluate each step.

Technical Questions

  1. Debug Transformer (Debugging, Transformers)
  2. Design a RAG System (System Design, AI)

Tips & Insights

Familiarity with the relevant technologies and components is crucial for success in both coding and design interviews.