Where it comes from

How to answer

One candidate interviewing for a Databricks role reported, in September 2026, that the hiring manager round had open-ended questions to check technical depth, such as a time they solved a difficult technical problem. Source 1FDE interview at Databricks (post by u/LongjumpingBit6900)PublisherReddit r/leetcodeSource typecandidate report on RedditSource 2FDE interview at Databricks (comment by u/LongjumpingBit6900)PublisherReddit r/leetcodeSource typecandidate report on Reddit The poster did not say how answers were judged. Prepare it as a test of whether you can go down several levels on your own, and whether you know why the problem was hard.

Pick for difficulty, not size. A good story has a symptom that misled people, an obvious fix that did not work, and a mechanism you can explain on a whiteboard. Intermittent bugs, correctness under concurrency, and problems that crossed into a system you did not control make good material. A migration that was merely long does not.

Then take it down, level by level, without waiting to be asked.

  1. The symptom and its stakes, in two sentences, with a number: what was wrong, who noticed, what it cost.
  2. Why it was hard. Name the property: it didn’t reproduce, the evidence pointed the wrong way, or the correct fix sat in someone else’s system.
  3. What you ruled out, and how. Two hypotheses and the check that killed each one. This is where depth shows.
  4. The mechanism. The actual cause, stated so an engineer could reproduce it.
  5. The options for the fix, and the trade-off that decided it, including the one you rejected and when it would be right.
  6. Proof it worked, and what you check now so it can’t return.

Say “I” for the steps you took. The trap is stopping at the label (“a race condition”) and waiting. Go one level past where you think the interviewer will stop, then offer to go further.

GlossaryForward deployed engineerA software engineer who builds and ships production systems inside a customer’s problem and environment, accountable to that customer’s outcome.More on Forward deployed engineer

Follow-ups

What the interviewer may ask next, once your first answer is on the table.

  • What did you try first that didn’t work, and what did it tell you?
  • Why couldn’t you just use the obvious fix?
  • What would have made this easy, and why didn’t you have it?

Where answers go wrong

  • Picking the biggest project instead of the hardest problem, so the answer is a tour of scale with no moment where the obvious approach failed.
  • Stopping at the first level (“it was a race condition”) and waiting to be asked, so the interviewer has to dig for the mechanism and your part in finding it.

Answer this in two minutes

Write the answer you would say out loud. The clock starts with your first word.

Two minutes

Illustrative answer about a fictional project

“The hardest was a sync that silently lost rows. I was the deployed engineer for a regional hospital network, pulling updates from their Postgres scheduling database into our capacity planning product.

Learn this in Module 12: Take-homes and presentations, part of the curriculum.