How do I prepare for a coding interview in 4 weeks?
TL;DR: Four weeks is enough for a focused sprint: week 1 rebuilds data-structure fundamentals, weeks 2-3 drill the highest-frequency patterns (two pointers, sliding window, BFS/DFS, dynamic programming basics), week 4 runs timed mocks and behavioral prep. Pattern fluency beats problem count.
The core principle: interviewers test a surprisingly small set of recurring patterns. Grinding 300 random problems is slower than mastering ~15 patterns across ~100 well-chosen problems — this is the logic behind every serious prep curriculum, and it fits a 4-week window.
The 4-week plan
| Week | Focus | Output |
|---|---|---|
| 1 | Arrays, strings, hash maps, linked lists, big-O fluency | 20-25 easy/medium problems; no timer |
| 2 | Trees, graphs (BFS/DFS), binary search, two pointers, sliding window | 25-30 mediums; start explaining aloud |
| 3 | Heaps, intervals, backtracking, DP fundamentals; company-tagged problems | 25-30 mediums, a few hards; 35-min timer |
| 4 | Full timed mocks, weak-pattern review, behavioral stories | 4-6 mock interviews under realistic conditions |
Step-by-step
- Pick one language and stay in it. Fluency in one beats familiarity in three. Know its idioms: sorting with comparators, hash-map patterns, string building.
- Train the narration from week 2. Interviews grade communication: restate the problem, state the brute force, improve it aloud, analyze complexity. Silent solving is a failing habit that feels productive.
- Use spaced review. Redo every failed problem 2-3 days later. A problem solved once with hints is not learned.
- Simulate real conditions in week 4. Timer, no autocomplete run-and-check loops, thinking out loud. InterviewBoost.ai's coding interview assist plus AI mock interviews cover both halves — timed technical practice and the behavioral rounds that candidates skip and then fail.
- Prepare the behavioral loop too. Most software loops include one; have 5-6 STAR stories ready (hard bug, conflict, deadline, failure). Losing an offer on behavioral after four weeks of algorithms is the classic own-goal.
- Day before: stop. Light review of your pattern notes, sleep. Cramming new DP variants at midnight subtracts points.
If interviews arrive mid-preparation: take them. Real interviews are the highest-fidelity practice available, and early ones calibrate your remaining weeks. For live support during real calls, InterviewBoost.ai's Live Interview Assist suggests structure in 0.3 seconds on Zoom, Teams, and Meet — use it as a safety net, never a substitute for the drilling above.
FAQ
How many problems total should I solve in 4 weeks? Roughly 80-100 with genuine understanding and spaced repeats. Pattern coverage matters more than the count.
Should I do easy, medium, or hard problems? Mostly mediums — they dominate real screens. Easies to warm up fundamentals in week 1; hards only for pattern extension in week 3+.
What if I blank during the real interview? Verbalize: restate the problem, walk a small example by hand, state the brute force. Interviewers score recovery and reasoning, and partial credit is real.
Is 4 weeks enough for FAANG-level loops? Enough for a competitive attempt if your fundamentals exist; if you're relearning CS from zero, 8-12 weeks is more realistic. Book the interview at the far end of your honest window.
By Pinal Dave Last updated: 2026-07-23