Backend Interview Questions (With Answers)

5,626 Questions asked

May 2026 First seen

Jun 2026 Last seen

5626 Unique questions

🥧 Difficulty mix

How hard are these questions?

Easy 786 (14%)Medium 4010 (71%)Hard 830 (15%)

📊 Question type

Breakdown by interview phase

🔥 12-week activity

When candidates are asked these

Last 12 weeks →

🏷️ Top topics

Where these questions cluster

Backend Apis 1054

System Design 790

Php 766

Java 548

Python 471

Databases Nosql 416

Databases Sql 416

Go 416

👤 Experience level mix

What seniority these are asked at

Fresher (0-1yr) 786Mid (3-6yr) 4010Senior (6+yr) 830

📝 Recent questions

Latest 10 asked by candidates

🟢 Easy ✅

What is the difference between Java threads and Java synchronized, and when would you use each?

Java

Conceptual · Asked 1× · Jun 2026

🟡 Medium ✅

How would you troubleshoot a problem involving Java garbage collection?

Java

Debugging · Asked 1× · Jun 2026

🟢 Easy ✅

What is Java class loading, and what problem does it solve?

Java

Conceptual · Asked 1× · Jun 2026

🔴 Hard ✅

How would you compare Java class loading and Java serialization for a production system?

Java

Conceptual · Asked 1× · Jun 2026

🔴 Hard ✅

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🥧 Difficulty mix

📊 Question type

🔥 12-week activity

🏷️ Top topics

👤 Experience level mix

📝 Recent questions

What is the difference between Java threads and Java synchronized, and when would you use each?

How would you troubleshoot a problem involving Java garbage collection?

What is Java class loading, and what problem does it solve?

How would you compare Java class loading and Java serialization for a production system?

When would you choose Spring Security in a real project?

How can you improve the performance of a system that uses Spring MVC?

How does Spring Cloud work at a high level?

How does JUnit work at a high level?

How would you troubleshoot a problem involving Python metaclasses?

How can you improve the performance of a system that uses Python pathlib?

🎤 Want these answered in real-time during your interview?