Apple·Software Engineer·Onsite - System Design / Architecture
- Design an Applicant Tracking System (ATS).
“I jumped straight into the data model which was probably the wrong call.”
FAANG / Big Tech
Most of these Apple write-ups come from Software Engineers (212), then Machine Learning Engineers (85) and Data Scientists (32). The most reported rounds are the technical phone screen (217), the system design round (48), the product sense round (29) and the behavioral / leadership round (22).
372 interview notes · updated Oct 2026
“I jumped straight into the data model which was probably the wrong call.”
“Started with the obvious stuff, CNNs, anchor boxes, two-stage vs single-stage detectors.”
“Classic Apple product question and I still fumbled the opening.”
“I picked a sales funnel dashboard I'd built a while back, which in hindsight was probably too old to speak to confidently.”
“I got the prefix sum approach pretty quickly and coded it up with a hash map to hit O(n).”
“I knew the surface answer but fumbled a bit when they pushed on trade-offs.”
“Classic binary search on the answer.”
“I knew the general shape of this: DOM, CSSOM, render tree, layout, paint.”
“I went with a preorder traversal using null markers for missing nodes, which worked, but I spent way too long debating BFS vs DFS in my head before committing.”
“I froze for a second because my first instinct was to think about the steel frame, but then I realized I had no idea how to anchor that number.”