Software Engineer Interview Questions
Common interview questions for software engineering roles, covering coding, system design, and behavioral aspects.
Behavioral Questions
These questions assess your past experiences and how you handle workplace situations.
Tell me about a challenging bug you fixed and how you approached it.
Tip: Use the STAR method and focus on your debugging process.
Describe a time you disagreed with a technical decision. How did you handle it?
Tip: Show collaboration and data-driven decision making.
Tell me about a project you are most proud of.
Tip: Quantify impact and explain your specific contributions.
How do you stay updated with new technologies?
Tip: Mention specific resources, communities, or side projects.
Technical Questions
These questions test your technical knowledge and problem-solving abilities.
How would you design a URL shortening service like bit.ly?
Tip: Discuss scalability, database choices, and handling collisions.
What happens when you type a URL into a browser?
Tip: Cover DNS, TCP/IP, HTTP, and rendering.
Explain the difference between SQL and NoSQL databases. When would you use each?
Tip: Give concrete examples and trade-offs.
How would you optimize a slow database query?
Tip: Discuss indexing, query plans, and denormalization.
Design a rate limiter for an API.
Tip: Consider sliding window, token bucket, and distributed scenarios.
Competency Questions
These questions evaluate your skills, knowledge, and abilities for the role.
How do you ensure code quality in your projects?
Tip: Mention testing, code reviews, CI/CD, and documentation.
Key Topics to Prepare
Preparation Tips
- Practice coding problems on LeetCode or HackerRank
- Review system design fundamentals
- Prepare 3-5 STAR format stories about past projects
- Research the company tech stack
- Be ready to write code on a whiteboard or shared editor
UK-Specific Considerations
- Right to work documentation may be discussed
- Notice period expectations (typically 1-3 months)
Software Engineer Interview Questions by Location
Related Resources
Questions are based on common patterns in UK Software Engineer interviews. Actual questions may vary by company.