Palantir MLE Interview Questions (2026)

Questions reported from Palantir machine learning engineer interviews. This bank tracks 11 questions asked at Palantir (5 with free model answers). Practice them live with DeepOffer's AI voice interviewer.

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#6 How Do L1 and L2 Penalties Shape a Model Differently? ★
#219 Design permission-aware retrieval so users never see content they cannot access in the source system. ★
#228 Explain why plain RAG gets "how many open orders are blocked on a supplier issue?" wrong, and name the right architecture.
#240 Design human-in-the-loop approval for an agent that takes consequential actions. ★
#284 Design a document-intelligence pipeline: scanned PDFs in, structured fields out, at 10M documents.
#285 Design a Text-to-SQL system over a warehouse with thousands of tables. ★
#288 Design an LLM gateway with routing across providers, failover, caching, budgets, and rate limits. ★
#352 Debug a program that models infection spread across a social graph.
#356 Find and fix a double-counting bug in a function that tallies values in a HashMap.
#386 Explain why Palantir and why this team; describe a time you pushed back on a customer request.
#387 Discuss how you think about Palantir's defense and intelligence work and what you would do if asked to build something you are uncomfortable with.