Key takeaways
- Week 1: map the loop and refresh fundamentals. Week 2: patterns, not random problems.
- Week 3: system design with a repeatable framework. Week 4: mocks and story polish.
- Prepare 6–8 STAR stories that can answer most behavioral questions.
- Debrief after every round — write down what went well and what to fix.
Week 1 — Map the loop and refresh fundamentals
Ask your recruiter for the exact interview format: number of rounds, coding language, whether there's system design, take-home or behavioral. Then refresh core data structures (arrays, hash maps, trees, graphs, heaps) and complexity analysis.
Week 2 — Practice patterns, not random problems
Group practice by pattern: two pointers, sliding window, BFS/DFS, binary search, dynamic programming, intervals, heaps. For every problem, say your approach out loud before coding, then test with edge cases. Interviewers grade communication as much as correctness.
Week 3 — System design with a framework
Use the same structure every time:
- Clarify requirements and constraints (users, scale, latency, consistency).
- Define APIs and data model.
- Draw a high-level design.
- Deep-dive the bottleneck: storage, caching, queues, sharding.
- Discuss trade-offs, failure modes and what you'd monitor.
Practice on classics: URL shortener, chat, news feed, rate limiter, notification system.
Behavioral: build a story bank
Prepare 6–8 stories in the STAR format (Situation, Task, Action, Result) that cover: a conflict, a failure, a project you led, a tough decision, influencing without authority, mentoring and a time you went beyond scope. Most behavioral questions can be answered by adapting one of them.
"Tell me about a time you disagreed with a teammate." → Situation, your specific actions, the measurable result, what you learned.
Week 4 — Mocks and polish
Do at least 3 timed mock interviews with a peer or an AI coach. After each, write a short debrief: what you'd say differently, which story landed, which concept was shaky. Fix those before the real loop.
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FAQ
How many coding problems should I solve?
Coverage of patterns matters more than volume. Being able to recognize and explain each common pattern beats grinding hundreds of random problems.
How do I prepare for behavioral interviews?
Write 6–8 STAR stories from your real experience, quantify results and practice telling each in about two minutes.
What if I fail a round?
Ask for feedback, write your own debrief and adjust your plan. Many strong engineers fail loops before passing.