Dow·Software Engineer·Technical Phone Screen
May 2026
Research interview at Dow for a Research Engineer role that went deep into Grad-CAM, specifically how it extends beyond 2D images into 3D atomic and point-cloud spaces. The questions were more physics-meets-ML than anything I'd prepped for, and I felt the gap pretty quickly.
- What does the derivative of the penultimate-layer activation physically represent when you're working in 3D atomic or point-cloud space rather than a 2D image?
- How does gradient flow work in non-continuous or discrete spaces like atomic point clouds, where standard backprop assumptions break down?
- Walk through the chain rule as it applies to atomic environment descriptors like SOAP. Where exactly does the gradient propagate, and what is the physical meaning of each Jacobian factor?
“I started answering this the 2D image way out of habit, talking about pixel importance, and then had to backtrack mid-sentence.” The rest of the author's notes on Software Engineer interview at Dow, Technical Phone Screen round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.
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