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Meta·Machine Learning Engineer·Technical Phone Screen·Senior

SeniorPrefer not to say
May 2026Remote

Summary

Remote ML Engineer interview at Meta where I got so locked into coding that I skipped testing my own solution, only to realize after hanging up that there was a bug sitting right in the middle of it.

Questions Asked (1)

Q1

You skipped a dry run during a remote coding interview and found a bug in your solution afterward. How would you have caught it earlier, how do you handle communication with the interviewer in the moment and after, and what do you actually change going forward?

Algorithms & Data StructuresAdaptability & Ambiguity
Author's notes

The bug was embarrassingly catchable.

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AI HintsAI Generated

Suggested Approach

Acknowledge the mistake directly, then walk through a structured retrospective: how you would have caught the bug earlier (e.g., dry run, edge cases), how you communicated in the moment and after (transparency, ownership), and what concrete process changes you'll adopt. Emphasize that you treat the interview as a collaborative problem-solving session, not a solo performance.

Pro tip: Frame the dry run as a communication tool, not just a debugging step—narrate your trace so the interviewer can follow and catch issues with you. After the interview, send a brief thank-you note that includes the corrected solution and your reflection, turning a mistake into a demonstration of growth.

1. Own the mistake and set context

Briefly acknowledge that skipping the dry run was a missed opportunity, and explain why it happened (e.g., time pressure, overconfidence). Show self-awareness without making excuses.

2. Explain how you would have caught it earlier

Describe specific techniques: manually tracing code with a small example, checking edge cases, or using a systematic dry-run checklist. Tie this to the bug you found.

3. Detail in-the-moment communication

Explain how you would have handled it during the interview: if you noticed the bug, calmly point it out and propose a fix; if not, ask the interviewer for a moment to verify. Emphasize transparency and collaboration.

4. Describe post-interview follow-up

Mention sending a concise thank-you email that includes the corrected solution, a brief explanation of the bug, and what you learned. This shows accountability and initiative.

5. Outline concrete process changes

List specific habits you'll adopt: always allocate time for a dry run, use a checklist, practice under timed conditions, and narrate your thought process. Connect these to ML engineering (e.g., testing hypotheses, validating models).

Key Points to Mention

  • Importance of dry runs and manual tracing in coding interviews
  • Systematic edge-case testing (empty inputs, single element, large inputs)
  • Transparent communication with the interviewer during the interview
  • Post-interview follow-up etiquette and turning mistakes into learning opportunities
  • Concrete process improvements (checklists, time management, practice)
  • Relevance to ML engineering: iterative testing, debugging models, and communicating uncertainty

AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.