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Luma AI interview notes, page 2 of 2

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Screna has 12 Luma AI interview write-ups. The most reported round is the technical phone screen (12).

12 interview notes · updated Jul 2026

Luma AI·Machine Learning Engineer·Technical Phone Screen

Jun 2026
Interviewed for an ML Engineer role at Luma AI and got hit with a pretty hands-on signal processing question. Short session, not a lot of back-and-forth, just code it up.
  • Implement a Gaussian image filter from scratch.

“I knew the theory well enough but actually coding it cleanly under pressure is a different thing.”

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Luma AI·Machine Learning Engineer·Technical Phone Screen

Jul 2026
Interviewed for an ML Engineer role at Luma AI and got hit with a pretty deep computer vision / data pipeline question that honestly felt more like a take-home prompt than something you'd answer live. The scope was wide and I wasn't fully prepared for how much implementation detail they expected on the spot.
  • Walk through how you'd implement around 10 image augmentations for grayscale digit images in a denoising training pipeline, including things like random resize, crop, rotation, flips, brightness/contrast jitter, Gaussian noise, elastic distortion, and cutout. Cover in-place operations, before/after visualizations, autograd safety, and how you'd seed the pipeline for reproducibility.

“This was a lot to unpack in one question.”

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