30-Day Tech Interview Prep Plan
Thirty days is a tight but workable timeline for a focused candidate. This plan prioritizes high-return topics and builds toward full mock interviews in the final week.
Week 1: Foundations
Day 1-7: Arrays, strings, hash maps, and two pointers. Solve 3-4 problems per day (mix of easy and medium). Focus on pattern recognition, not memorizing solutions. For each problem: understand why the pattern works, not just that it works.
Behavioral prep: draft STAR stories for 5 core themes (leadership, conflict, failure, success, ambiguity). Do not memorize word-for-word; memorize the structure and key metrics.
Week 2: Core Algorithms
Day 8-14: Binary search, linked lists, trees (DFS/BFS), and graphs. These four topics cover roughly 50% of interview questions. Prioritize trees and graphs if time is limited.
System design: start with one system design per day. Use FAANG interview prep resources to understand the standard framework (requirements, capacity, API, data model, key components). Do not skip this even if the role is less senior.
Week 3: Advanced Topics
Day 15-21: Dynamic programming, heaps, backtracking, and sliding window. DP is high-value but high-effort. Focus on pattern identification: 0/1 knapsack, unbounded knapsack, LCS, LIS, and grid DP.
Mock interviews: schedule at least 3 mock interviews this week with a partner or on Pramp/interviewing.io. Real-time pressure reveals gaps that solo practice does not.
Week 4: Polish and Simulate
Day 22-30: Simulate full interview days. Two coding problems back-to-back. One system design. Behavioral prep. Review weak areas identified in mocks.
Company-specific prep: read recent reports from your target company on LeakCode. Know their stack. Prepare questions to ask the interviewer. Research the team you are interviewing with.
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Practice with real questions from your target companies.
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