Ace Your Next Coding Interview

Interview preparation advice tends to swing between “grind five hundred puzzles” and “just be yourself”. Both waste your time. Interviews are a skill with a small surface area, and a few weeks of deliberate practice covers most of it.

Know what is actually being evaluated

A coding interview measures three things: whether you can decompose an unfamiliar problem, whether you can turn a plan into working code, and whether working with you for an hour is pleasant. Raw puzzle recall is a poor proxy for all three — which is good news, because the first and third can be practiced directly.

Practice out loud, or it does not count

Solving problems silently trains the wrong muscle. In the room you will be narrating: restating the problem, proposing an approach, weighing a trade-off. Rehearse exactly that — set a timer, pick a problem, and talk through it to an empty chair or a friend. Awkward at first, decisive in the interview.

Build a small pattern vocabulary

Most interview problems are variations on a dozen shapes: two pointers, sliding windows, frequency maps, traversals, binary search on the answer. Learn to recognize the shape before writing anything. When you identify the pattern out loud, you demonstrate the decomposition skill interviewers actually score.

When you are stuck, get stuck well

Nobody solves everything. What separates candidates is behavior at the wall: state what you know, propose the brute force, quantify why it is too slow, and probe which constraint could be exploited. Interviewers routinely pass people who did not finish but navigated the wall methodically.

The week before

Stop learning new patterns. Re-solve a handful of problems you already understand, sleep normally, and prepare two good questions to ask them — an interview is also you evaluating the team. Walk in rested, narrate clearly, and let the practiced habits carry the hour.