BlackRock·Software Engineer·Technical Phone Screen
- Given an array of intervals, merge all overlapping ones and return the resulting non-overlapping intervals.
“I knew this problem but blanked on the sorting step for a second.”
Large Enterprises
Most of these BlackRock write-ups come from Software Engineers (16), then Data Scientists (3) and Product Managers (1). The most reported rounds are the technical phone screen (15), the behavioral / leadership round (2), the online assessment (1) and the system design round (1).
20 interview notes · updated Jul 2026
“I knew this problem but blanked on the sorting step for a second.”
“I started with the class hierarchy which felt natural, vehicle types mapping to spot sizes and all that.”
“I knew prefix sums going in, so the core answer came out fine.”
“This question is basically five questions stitched together and they expect you to hold the thread across all of them.”
“The fill part was fine, BFS/DFS flood fill is pretty standard.”
“This one sprawled in every direction and I let it.”
“This was the meat of the whole thing and I probably over-engineered my answer.”
“Tripped up on statement 3 for a second.”
“I fumbled this the first time I practiced it because I kept defaulting to 'scale and impact' which sounds like I googled the company for five minutes.”
“I went with merge sort because I could at least explain stability confidently.”