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Spacex interview questions

5 practice questions in the style of Spacex's interviews, covering Software Engineering Fundamentals, Machine Learning, Coding & Algorithms.

Questions5

2 easy3 medium0 hard

Your progress0/5

Spacex interview questions by the numbers

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Katkat has 5 Spacex interview questions. The largest topics are Machine Learning (40%), Software Engineering Fundamentals (40%) and Coding & Algorithms (20%). By difficulty: 40% easy and 60% medium. The most common round is Technical Screen (100%). Frequent concepts include Benchmarking, concurrency, Data Engineering and debugging.

Topics

Difficulty

  • Easy40% · 2
  • Medium60% · 3

Interview rounds

  • Technical Screen100% · 5

Roles

  • Software Engineer60% · 3
  • Machine Learning Engineer20% · 1
  • Research Scientist20% · 1

Frequent concepts

  • Benchmarking20% · 1
  • concurrency20% · 1
  • Data Engineering20% · 1
  • debugging20% · 1
  • io20% · 1
  • KV Cache20% · 1

Showing 1–5 of 5 results

  • Align Telemetry Streams and Publish Versioned CorrectionsEasy

    Define telemetry subtraction semantics, handle missing or repeated timestamps, and reconcile late events with versioned, idempotent corrections.

    SpacexSoftware EngineerSoftware Engineering FundamentalsTechnical Screen
  • Debug Missing Output from a Python Multiprocessing PoolEasy

    Diagnose and fix issues in a Python multiprocessing script where asynchronous workers fail to produce output, addressing pool lifecycle management, exception propagation, and centralized file I/O.

    SpacexSoftware EngineerSoftware Engineering FundamentalsTechnical Screen
  • Diagnose a Production Classifier and Defend Its Systems DesignMedium

    This problem tests the ability to diagnose training-serving skew in machine learning models and the architectural considerations required to maintain consistency between offline evaluation and online production environments.

    SpacexMachine Learning EngineerMachine LearningTechnical Screen
  • Dynamic Island CountsMedium

    Report the exact island count after each land addition by tracking only activated cells and merging distinct neighboring components efficiently.

    SpacexSoftware EngineerCoding & AlgorithmsTechnical Screen
  • Implement and Benchmark Speculative DecodingMedium

    Implement autoregressive and speculative decoding algorithms with key-value cache management, along with a benchmarking harness to measure acceptance rates, latency, and throughput.

    SpacexResearch ScientistMachine LearningTechnical Screen

Spacex interview experiences

All 9 →
  • Speculative Decoding in a 60-Minute ML Coding RoundSpaceX · Research Scientist · New Grad · Technical Screen · Sep 2026

    There were two 60-minute interviews: an ML coding round and a research chat. The ML coding round asked me to implement speculative decoding. I needed to write one normal decoding function and one speculative decoding function. The speculative function had the following interface in the prompt: The test case required the speculative-decoding implementation to produce its output faster than the nor…

  • Software Engineer interview at Spacex: interview experienceSpacex · Software Engineer · Jul 2026

    I got far enough to face technically intense screens that seemed built to test end-to-end understanding. Even when a question was posed as a hypothetical, it did not feel like a formula-memory exercise. It felt as though they wanted hands-on reasoning and confidence with fundamentals across the chain. The hardest part was a run of very pointed hypotheticals that seemed only loosely connected to m…

  • Spacex QA Engineer interview: recruiter support and onsite feedbackSpacex · QA Engineer · HR Screen · Jul 2026

    After a recruiter call, I went through a series of phone interviews that felt more structured than anything I had done before. There was another round with an engineer, followed by a hiring-manager call that ran about half an hour longer than I expected. That conversation stayed pretty chill, though they kept asking me to connect my background to their work. Soon after that, I was invited onsite…

  • Spacex Software Engineer interview experienceSpacex · Software Engineer · HR Screen · Jul 2026

    The recruiter-to-technical flow was fairly standard, but it became a full evaluation cycle. It started with HR or cultural fit, followed by technical conversations with team members. In one technical discussion, I spoke directly about prior jobs while several people listened and occasionally joined in. Later rounds demanded deeper understanding and clearer communication. The hiring manager was in…

  • Spacex Software Engineer interview: a surprise half-day panelSpacex · Software Engineer · HR Screen · Jul 2026

    I started with HR, then met a hiring manager and a technical team member before what was described as an onsite. By the time I reached the panel, the process had grown into a full half-day onsite interview. What caught me off guard was the framing. It had been sold as a simple, quick chat, but it was really a technical interview. After I answered, they pushed back with follow-up questions that se…

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