The complete guide to every type of technical interview: coding, system design, take-home, and pair programming. Know what to expect and how to ace it.
You solve 1-2 algorithm and data structure problems in 45-60 minutes. Used by Google, Amazon, Meta, Apple, and most top tech companies.
You design a large-scale distributed system from scratch. Tests your ability to think about scalability, reliability, and trade-offs.
Build a small project over 3-7 days and submit it for review. Common at startups and mid-size companies.
You code alongside a company engineer on a real or simulated problem. Tests collaboration, communication, and coding style.
80% of coding interview questions follow one of these six patterns. Master them and you can solve most problems you'll encounter.
Use two indices moving through a data structure. Often replaces O(n²) brute force with O(n).
Maintain a window of elements as you move through an array or string. Great for substring and subarray problems.
Breadth-first and depth-first search for trees and graphs. BFS for shortest paths, DFS for connectivity and cycles.
Divide and conquer on sorted data. O(log n) time. Goes beyond simple search — applies to rotated arrays, search spaces.
Break problems into subproblems and cache results. Optimal for optimization and counting problems.
Efficiently find min/max elements. Use for top-K problems, merge sorted lists, and scheduling.
Follow this in every live coding interview. It demonstrates structured thinking, which is what interviewers actually evaluate.
Ask 2-3 clarifying questions before writing any code. Confirm input format, edge cases, and constraints. Shows you think before you act.
Narrate your thought process. Say what approaches you're considering and why. Interviewers grade your thinking, not just your output.
Propose a brute force solution first and state its time complexity. Then ask if you should optimize. Shows you can solve the problem first.
Identify which pattern applies: sliding window, two pointers, BFS/DFS, etc. Explain why this optimization works.
Walk through 2-3 test cases manually after writing your solution. Include an edge case. Fix bugs out loud.
The biggest mistake. Interviewers want to see how you think. Spend 5 minutes clarifying and planning before writing a single line.
Silent coding is unreadable to interviewers. They can't help you if they don't know where you're stuck. Narrate everything.
Empty arrays, null inputs, integer overflow. Mention edge cases even if you don't handle them all. It shows thoroughness.
You will be asked about time and space complexity for every solution. Practice calculating and explaining Big-O until it's automatic.
If you're stuck, say so and ask for a hint. Most interviewers will give you one. Getting unstuck gracefully is better than freezing.
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