Every question ordered easy → hard into a journey per topic. Written by engineers who sat the loops at the labs hiring right now. Browse the full set of Forward Deployed Engineer interview questions by topic and company.
Updated · 69 questions added or revised in the last 30 days
Prefer to browse? Follow the map instead: the four stages of preparation, and where to join them given what you already know.
17 scenarios from real loops. Find the gap costing you most, and get a plan wired to real questions and lessons.
Which role are you actually going for?
30 missions on simulated customer boxes: a support agent that follows instructions hidden in a ticket, a webhook that invoices twice, a model that changed under the same name. Read the traces, watch the metrics move, edit the config, restart the service, and prove the fix from the system’s own state. Nothing to install.
3 free · 3 with a free account · 24 Premium · 20–45 minutes each
THE FDE VIDEO LIBRARY
Follow a course lesson by lesson, watch a concept take shape, or work through an interview answer. Every video sits beside its written explanation.
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9:27Course series · 30 videos
Start with lesson 1
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9:50Course series · 30 videos
Start with lesson 1
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3:21Concept explainer
Watch the explanation, then work through the page
Watch this lessonFree samples and Premium lessons. Videos follow the access requirements of their written pages.
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Browse FDE jobsGrounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.
ACCURACY YOU CAN AUDITEvery code sample, SQL query and worked number here is executed and checked before it ships, then re-audited. Find an error we can verify and we add a day of full access to your account.How we check, and what counts →Resist the urge to touch the prompt. A data refresh changes retrieval, not generation — so measure retrieval before you theorize.
# golden set recall, before touching anything hits = retriever.search(q, k=20) print(recall_at_k(hits, gold)) # 0.31 — was 0.86
Recall cratered. The refresh re-ran ingestion but skipped re-embedding, so the index points at stale vectors.
408 multiple-choice scenarios across all 11 topics, easy to staff-level. Every answer explains itself and links into the worked material, and the questions rotate so a retake is a fresh test.
A RAG answer is wrong. Which single question splits the failure into its two bug classes?
If the passage never came back, no prompt work will help: fix retrieval. One log lookup separates the two bug classes…
Rate your recall after each answer. Your topic mastery updates as you study, and your next session starts with a suggestion based on the areas that need more practice.
Trace an LLM request from tokenization to the generated response. Each stage names the mechanism, with annotations that connect the explanation to the numbers. 162 answers, concepts and lessons now carry one.
4 courses and 124 lessons take you from your first discovery call to deployments behind an air gap. Work through the customer decisions alongside the engineering.
Each work sample is a small broken thing from a real deployment, handed to you the way a customer hands it over: three symptoms in one ticket, no list of causes. You get the fixtures, a hostile server or a seeded database, and a grader you run locally. Nothing to install, no API key, no account on anything, and every dataset is synthetic and written for the exercise.
The tests going green is the smaller half. Each pack ends with the questions an interviewer asks next, and a reference solution that explains what was being scored rather than only showing the answer. This is the closest thing on the site to the job itself.
The FDE reading room
177 pages · 32 diagrams · PDF + reference code
Design agents that act for one person inside an organization: delegated identity, a deterministic gatekeeper, exact-action approvals, memory and recall, voice and messaging surfaces, decision models, and a tested reference build on Google ADK.
66 pages · 20 figures · PDF + calculation companion
Understand vectors, probability, evaluation, gradients, capacity and data visualisation through small worked examples. Includes exercise solutions and runnable calculators.
108 pages · 21 diagrams · PDF + operating toolkit
Establish the mandate, hire and develop the team, govern customer engagements and reconcile the economics. Four worked cases and 24 editable operating forms.
Not the role in general. The loop: the decomposition round, the practical builds, the applied LLM work, and the customer rounds that decide more offers than anyone admits. Free for premium members on release.
What is inside the book →Every answer, concept and course, all published video lessons, hands-on FDE Lab missions, Premium PDF guides and companion files, the full practice-test bank and work-sample downloads. Referral Premium excludes guide PDFs and their companion files.
6 months · One payment · No auto-renewal
Study alongside free video lessons.
launch price · regularly ₹4,000 / $50
