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Interview

FDE interview questions

Forward Deployed Engineer loops test whether you can ship under customer constraints — not only whether you can invert a binary tree.

Typical loop shape

  1. Recruiter / hiring manager screen — travel tolerance, background, why FDE
  2. Coding — Python/TS, data wrangling, API integration; often Medium LeetCode depth plus practical tasks
  3. System design (enterprise) — identity, integrations, RAG/agents, failure modes
  4. Case / decomposition — ambiguous customer problem → scoped plan
  5. Behavioral — pushback, ownership, ambiguity

Palantir-style processes made “decomp” famous; AI labs remix the same idea around agents, evals, and enterprise rollout.

Coding questions (examples)

  • Transform a messy nested JSON/CSV into a clean schema with validation
  • Implement retry with backoff and idempotency for a flaky webhook consumer
  • Write a small service that scores RAG answers against a rubric
  • Debug why an OAuth callback fails across environments

Practice production taste: clear interfaces, tests for edge cases, and explanation of tradeoffs. Prep note: system design.

System design prompts (examples)

  • Design an enterprise RAG assistant with SSO, document ACL inheritance, and audit logs
  • Deploy an agent that can call internal tools without leaking data across tenants
  • Support an air-gapped or VPC-only model deployment with update strategy
  • Build ingestion for dirty CRM data with human-in-the-loop correction

Case / decomp questions (examples)

  • A hospital wants an “AI assistant next month.” Their EHR access is unclear and data quality is poor. What do you do in week one?
  • A customer insists on fine-tuning; you suspect prompting + retrieval is enough. How do you decide and communicate?
  • Production accuracy looks fine in evals but users abandon the tool. Diagnose.

Framework: clarify success metrics → list constraints → propose a thin vertical slice → name risks → define instrumentation. Deep dive: case study / decomp.

Behavioral questions (examples)

  • Tell me about pushing back on an unrealistic executive timeline
  • Describe a time you delivered with incomplete requirements
  • When did a production issue become a customer-trust issue?
  • How did field work change what the core product team built next?

More: behavioral question guide.

Company-specific next steps

Two-week prep plan

  1. Days 1–3: rewrite 6 STAR stories mapped to FDE behaviors
  2. Days 4–7: one enterprise design + one coding practical per day
  3. Days 8–10: three timed decomp drills (45–60 minutes)
  4. Days 11–14: company-specific research + mock loop

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