Interview Preparation in 2025: What Actually Works

Interview prep in 2025 isn't the same as 2020. Remote interviews are standard. AI tools are everywhere. Companies are testing different things. What worked five years ago might not work now. Here's what does.

System design hasn't gone away

Despite the hype about AI changing everything, system design interviews are still core at most tech companies. The difference: interviewers care more about how you think than what you memorize.

They want to see:

• Can you clarify ambiguous problems?
• Can you reason about trade-offs?
• Can you communicate your design?
• Can you handle follow-up questions?

Practice by designing systems out loud. Use a whiteboard or Excalidraw. Time yourself. The muscle memory of "talk while you draw" matters. Reading about design isn't enough—you need to do it.

Coding: Fundamentals over tricks

LeetCode grinding has diminishing returns. Most interviews test:

• Can you translate a problem into code?
• Do you understand time and space complexity?
• Can you test your own solution?
• Can you handle a hint and adjust?

Focus on patterns, not problem counts. Sliding window, two pointers, DFS/BFS, dynamic programming—understand when to use each. One problem deeply understood beats ten problems half-solved.

And yes, practice without AI. Your interview won't have Copilot. If you can't write a for-loop or recursion from scratch, that's a gap.

Behavioral: Stories with structure

"Tell me about a time when..." hasn't changed. What has: interviewers want specific examples with measurable outcomes. "We improved performance" is weak. "We reduced p99 latency by 40% by adding a cache layer" is strong.

Prepare 5–7 stories that cover: conflict, failure, leadership, technical challenge, collaboration. Use STAR (Situation, Task, Action, Result). Practice telling them in under 2 minutes. The structure matters.

The AI question

You will be asked about AI. "How do you use AI in your work?" "What are the limitations?" "How would you design a system that uses LLMs?"

Have a genuine answer. Don't pretend you don't use it. Don't pretend it's magic. Talk about how you use it (code review, debugging, documentation) and its limitations (hallucinations, context limits, no reasoning about your codebase). Be honest.

Mock interviews matter

Reading and practicing alone isn't enough. You need feedback. Do mock interviews with friends, colleagues, or platforms like Pramp. Record yourself and watch it. Cringe at the "um"s and "like"s. Fix them.

The biggest gap I see: candidates who know the material but fall apart under pressure. Mock interviews simulate that pressure. Use them.

Timing and consistency

Cramming doesn't work. Two hours a day for six weeks beats ten hours a day for one week. Your brain needs time to consolidate. Spaced repetition works for system design concepts and coding patterns.

Start 4–6 weeks before your first interview. Mix system design, coding, and behavioral. Rotate so you don't burn out on one area.

What to skip

• Memorizing company-specific questions: They change. Focus on patterns.
• Chasing the latest interview format: Most companies still do coding + system design + behavioral. Master those.
• Over-preparing for one company: You'll interview at multiple places. General prep serves you better.

Interview prep in 2025 is about fundamentals, communication, and consistent practice. The tools change. The core doesn't.