The Minute-12 Rule: Coding Interview Time Management
I once watched a candidate produce the cleanest problem breakdown I'd seen all quarter. Constraints, two approaches with honest tradeoffs, complexity for both, a list of edge cases I hadn't thought of. It was minute 34 of a 45-minute slot. He had written zero lines of code. He didn't pass, and the note that sank him in the debrief wasn't "weak engineer." It was "no working solution." That's a…
A successful coding interview hinges on effective time management, not just raw coding ability. The 45-minute slot is effectively a 35-minute window after introductory and closing questions. To maximize your chances, follow the minute-12 rule: if you haven't written a working solution by minute 12, you're likely falling behind. Four predictable time sinks lead to interview failures: getting lost in thought, coding before an approach is agreed upon, debugging inefficiently, and panicking to rewrite code at the last minute.
Instead, treat the interview as a collaborative planning session with the interviewer as your co-planner. Budget your time wisely: spend minutes 0-3 introducing and clarifying the problem, minutes 8-12 devising an approach, minutes 12-33 coding, minutes 33-40 tracing and fixing bugs, and minutes 40-45 asking clarifying questions.
Writing a brute force solution by minute 20 is often better than an unfinished optimal one at the end. The key is to turn your plan into code before the clock runs out, as an unfinished solution is always better than no solution at all.
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