Microsoft·Software Engineer·Onsite - System Design / Architecture
Jul 2026
Microsoft system design round, one big question about building a RAG pipeline end to end. Pretty dense for a single session but they clearly wanted to see if you could reason through the whole stack, not just recite buzzwords.
- Design a Retrieval-Augmented Generation pipeline that takes a user query, retrieves relevant passages from a large corpus, ranks them, and returns the top K results to inject into an LLM prompt. Walk through ingestion, retrieval, ranking, and the trade-offs involved.
“This one sprawls fast if you're not careful.” The rest of the author's notes on Software Engineer interview at Microsoft, Onsite - System Design / Architecture round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.
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