Coding interview preparation is its own skill, genuinely distinct from day-to-day software engineering — treating it as a separate, deliberate practice (rather than assuming general competence transfers automatically) makes the process far less painful.
What Actually Gets Tested
- Pattern recognition — most problems are variations on a small set of recurring patterns (two pointers, sliding window, BFS/DFS, dynamic programming)
- Communication — narrating your thought process out loud matters as much as the final working code
- Handling edge cases without being explicitly prompted for them
A Practical Preparation Structure
- Learn the core patterns first, deeply, rather than grinding hundreds of unrelated problems — recognizing “this is a sliding window problem” is worth more than memorizing one specific solution
- Practice explaining your approach before writing any code — silently coding for ten minutes reads poorly in a live interview
- Time yourself under realistic constraints — most interview problems expect a working solution in 20-30 minutes, including discussion
- Review, don’t just accumulate — revisiting problems you struggled with weeks later cements the pattern far better than solving 100 new problems once each
The honest reality: this format tests a specific, narrow skill that correlates only loosely with actual day-to-day engineering ability — worth taking seriously as a gatekeeping hurdle regardless of that mismatch, since it remains the industry-standard filter at most companies.