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Interview Preparation

Prepare for coding, design, debugging, and behavioral interviews at different levels.

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Coding fundamentalsFrontend interviewsBackend interviewsMobile interviewsSystem designDatabase designDebugging interviewsBehavioral interviewsSenior leadership questionsQuestions to ask employers

Featured guides

Practical starting points for the highest-value topics.

Coding interview method

Make reasoning, correctness, and collaboration visible.

  1. Restate the problem and clarify inputs, constraints, and edge cases.
  2. Work through a small example before selecting a solution.
  3. Explain complexity and trade-offs before coding.
  4. Implement in small steps with clear names.
  5. Test normal, boundary, empty, and failure cases aloud.

Key idea: A correct solution nobody can follow is weaker than clear collaborative problem solving.

Senior system-design interview

Show judgment and prioritization rather than listing technologies.

  1. Clarify business and reliability requirements.
  2. Estimate the dimensions that affect design.
  3. Start with the simplest end-to-end architecture.
  4. Explore the most important bottleneck and failure modes.
  5. Discuss security, observability, migration, cost, and team ownership.

Key idea: Strong candidates explain why a component earns its complexity.

Behavioral stories

Prepare evidence of ownership, conflict, failure, and growth.

  1. Use context, responsibility, action, result, and learning.
  2. Be precise about your contribution and the team's contribution.
  3. Include trade-offs and what made the situation difficult.
  4. Use measured outcomes when available.
  5. Explain what you would change with what you know now.

Key idea: Reflection and judgment matter as much as the outcome.