A practice prompt we wrote. No company or candidate report names it, so it carries no company tag.
How to answer
By two employers’ published definitions, this project failed. As of September 2026, OpenAI’s San Francisco posting says FDEs measure success through production adoption, measurable workflow impact and eval-driven feedback. Source 1Forward Deployed Engineer (FDE) - SF | OpenAIPublisherOpenAISource typecompany job posting A Palantir blog post from April 2019 says its Deltas, engineers on a team that directly supports one customer, measure success by impact on the customer’s goal. Source 2Dev versus Delta: Demystifying engineering roles at PalantirPublisherPalantir BlogSource typecompany blog A system that works and goes unused scores badly on both, and a strong answer starts from that.
- The technical success, in one sentence with its proof. “It met the accuracy target in a two-week shadow run.” The question grants this, so don’t dwell on it.
- The organizational failure, as an outcome. Switched off, overridden, unfunded, left without an owner. Say when it happened and who decided.
- The failure mode, named. One of a short list: the sponsor wasn’t the user; the users were measured on something the system ignored; it changed someone’s job without their say; nobody owned it after handover. Naming the mode is what shows you learned something that transfers.
- The early signal you missed, with a date. A user who stopped coming to demos in week three, a comment you logged as a feature request, a pilot metric that measured the system rather than its use. This is the heart of the answer.
- What you do differently now. A check at a point in the project, and a later time it caught something.
The sentence to say out loud is the signal: “In week two a claims supervisor asked whether the new queue would still let her hand the hard ones to Marcus. I logged it as a feature request. It was telling me the tool took away the one lever she had.”
The trap is blaming the customer’s culture or readiness. If the failure was theirs alone, you have nothing to do differently, and the question’s second half goes unanswered.
Follow-ups
What the interviewer may ask next, once your first answer is on the table.
- Who could have told you earlier, and did you ask them?
- Once you saw the signal, could the project still have been saved?
- How do you check for this in the first two weeks of a project now?
Where answers go wrong
- Blames the customer’s culture or readiness, which leaves nothing the speaker would change.
- Spends most of the answer on the build the question already granted, and names the missed signal only when asked.
Answer this in two minutes
Write the answer you would say out loud. The clock starts with your first word.
Illustrative answer about a fictional project
I built a route-scheduling tool for a home-health agency. It planned each nurse’s daily visits across about 900 patients, and in a two-week shadow run its routes cut planned drive time by 18% while keeping every visit inside its time window.