Interview Prep
Software engineer interview questions that aren't just Leetcode.
Yes, you still need to reverse a linked list. But here's everything else they'll ask — and the part that actually decides who gets the offer.
May 2026 · 9 min read
You've been grinding Leetcode for 3 weeks. Great. That gets you through round 1. Rounds 2 through 5? That's system design, behavioral, and the dreaded "tell me about a technical challenge you faced" — where most engineers either freeze or ramble for 12 minutes about database migrations.
System Design
System Design
Design a URL shortener that handles 100M requests per day.
What they're really asking: Can you reason about scale without immediately reaching for 'just throw Kafka at it'?
System Design
Walk me through how you'd design the notification system for a chat app.
What they're really asking: Do you ask about requirements before drawing boxes? Real engineers clarify scope first.
System Design
How would you design a rate limiter for a public API?
What they're really asking: They want to see trade-offs — token bucket vs. sliding window — not a memorized answer.
Technical Deep Dive
Technical Deep Dive
Tell me about the most technically challenging project you've worked on.
What they're really asking: Can you go 5 levels deep without hand-waving? Vague answers signal vague work.
Technical Deep Dive
Walk me through a bug that took you days to fix. What made it hard?
What they're really asking: Debugging stories reveal how you think under pressure, not just what you know.
Technical Deep Dive
What would you change about the architecture at your current company if you could start over?
What they're really asking: They're testing whether you have opinions — and whether you can defend them without trashing your old team.
Behavioral & Collaboration
The round that trips up engineers who think 'soft skills' is a slur.
Behavioral & Collaboration
Tell me about a time you disagreed with a teammate on a technical decision.
What they're really asking: How do you push back without being a jerk? They're hiring a collaborator, not a contrarian.
Behavioral & Collaboration
Describe a time you had to give difficult feedback to a peer.
What they're really asking: Can you have hard conversations? Senior engineers do this every week.
Behavioral & Collaboration
Tell me about a project that failed. What did you learn?
What they're really asking: If you can't name a failure, they assume you've never owned anything important.
About You
About You
Tell me about yourself.
What they're really asking: Skip the chronological resume read. Lead with what you build and why you care.
About You
Why are you leaving your current job?
What they're really asking: Don't trash the last place. Frame it as moving toward something, not running from something.
Frequently asked questions
What questions are asked in a software engineer interview?
Most SWE loops include a coding round (data structures and algorithms), one or two system design rounds for mid-level and above, a technical deep-dive on a past project, and behavioral rounds covering collaboration, conflict, and impact.
How do I prepare for a software engineer interview?
Balance your prep across three areas: coding fundamentals (arrays, hash maps, trees, graphs, dynamic programming), system design (start with classics like a URL shortener and a chat system), and 3–4 deep project stories you can discuss in detail. Don't skip behavioral prep — it decides offers at senior levels.
Is Leetcode still important in 2026?
Yes for the coding round, but it's table stakes — passing Leetcode-style questions only gets you to the next round. System design, project deep-dives, and behavioral interviews are where offers are actually won or lost, especially at mid-level and above.
How long should I prepare for a software engineering interview?
Most candidates need 6–10 weeks of consistent prep: 3–4 weeks of coding patterns, 2–3 weeks of system design, and the rest on mock interviews and behavioral practice. If you're already employed and rusty, plan for the longer end.
The coding round is pass/fail. The behavioral and system design rounds are where offers are won.
Want answers that actually sound like you?
Bar Raiser drafts your interview answers from your real resume and experience — so they come out in your voice, not a template.