Mid leveltech

Full Stack Developer
Interview Questions

Covering Full Stack Developer interview questions — frontend, backend, databases, and deployment.. Free, no signup required.

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Technical Questions
Q1
Describe the architecture of a recent full stack application you built. How did you decide between monolithic vs. microservices architecture, and what trade-offs did you consider?
Why they ask this:* They want to assess your ability to design scalable systems, understand architectural patterns, and make informed technical decisions at a mid-level scope.
Q2
Walk us through how you optimized a slow database query or API endpoint in production. What tools did you use to identify the bottleneck, and what was the result?
Why they ask this:* They're evaluating your debugging skills, performance optimization knowledge, and practical experience troubleshooting real-world issues under pressure.
Q3
Explain the difference between SQL and NoSQL databases. When would you choose one over the other, and have you migrated data between them?
Why they ask this:* This tests your understanding of data persistence layers—a critical full stack skill—and whether you can justify technology choices based on project requirements.
Q4
How do you handle authentication and authorization in a full stack application? Describe your approach to securing API endpoints and managing user sessions.
Behavioral Questions
Q5
Tell us about a time when you had to debug a complex issue that spanned both frontend and backend. What was the situation, what steps did you take to isolate the problem, and how did you resolve it?
Q6
Describe a situation where you had to learn a new technology or framework quickly to meet a project deadline. How did you approach the learning process, and what was the outcome?
Q7
Tell us about a time you received critical code review feedback. What was the feedback, how did you respond, and what did you learn from it?
Situational Questions
Q8
What would you do if you discovered a critical security vulnerability in production code that you deployed two weeks ago? Walk us through your decision-making process and immediate actions.
Q9
How would you handle a situation where the backend API you're depending on is constantly changing its contract, breaking your frontend integration? What's your strategy to unblock yourself and the team?
Q10
Imagine you're tasked with reducing the bundle size of a frontend application that has grown to 5MB. What would be your approach, and what trade-offs might you consider?
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