Cape Forward Deployed Engineer interview questions

Every deployment has a skeptic, and 'I showed them data and they came around' is the answer everyone gives. The scored version starts with why they were right to be skeptical.

Every queue, webhook, and retry loop you'll ever deploy at a customer hides this distinction. Interviewers use it to separate people who've shipped from people who've read about shipping.

The single most common FDE behavioral question, and the 'week one' follow-up is where most candidates collapse. Here's the structure that signals you can be dropped into chaos and produce order.

This is a flight-risk filter, not small talk, FDE teams lose hires back to pure SWE roles constantly. The answer that passes is built on evidence, not enthusiasm. Here's what it sounds like.

A staple at OpenAI and Anthropic in both coding and design rounds. Most candidates can name the algorithms; few can say which one lets 2x your limit through, and that's the part that gets scored.

The NVIDIA warm-up that exposes whether you've written a kernel or just called .cuda(). The mapping from software hierarchy to silicon explains every GPU performance conversation that follows.

The signature FDE debugging genre: a moving fault, an opaque client, and a customer who's sure it's your fault. The winning method splits the problem at the boundary, and knows the four classic culprits hiding on their side.

A Fermi estimate with a paycheck attached. The interviewers' favorite filter: candidates who jump to a dollar figure miss the two numbers that actually break deployments, peak QPS and tokens-per-minute limits.

The two access-pattern killers behind most 'my kernel is 10x slower than cuBLAS' mysteries. The matrix transpose walks straight into both, which is why NVIDIA loves asking about it.

OWASP's LLM01 is the opening question of nearly every AI security screen. Most candidates can define direct injection; the ones who get hired explain why indirect injection is the one that ruins enterprise deployments.

Averages lie, and interviewers know most candidates quote them anyway. The fastest way to sound production-grade in any latency discussion is to reason about percentiles correctly, including the one trap almost everyone falls into.

The round is conversational discovery plus live Excalidraw diagramming, and it's graded on sequence: candidates who draw before asking fail. The discovery battery, the voice-pipeline boxes worth drawing, and the latency budget that anchors the whole design.

Kernel optimization is mostly the art of feeding 100+ TFLOPs from the small fast end of this hierarchy. Know the rough latencies and bandwidths, interviewers listen for the numbers.

A reported DeepMind research-engineer question. The winning answer opens with a memory budget in bytes, not a list of parallelism buzzwords, here's the full arithmetic and the layout it forces.

Candidates use these terms interchangeably and security interviewers notice immediately. The distinction, whose policy is being violated, drives completely different defenses, and that's the actual question.

A signature FDE triage question with a hidden rubric: interviewers score the *order* of your moves, not just the list. There's a reason 'what changed?' beats 'check the dashboards', and a reason mitigation beats diagnosis.