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Java Technical Lead Interview Questions

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511 java technical lead interview questions shared by candidates

They focused mainly on scalable Java backend architecture, microservices design, concurrency handling, performance optimization, system design decisions, and experience leading development teams in production environments.
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Lead Java Developer

Interviewed at Viber

4.4★
May 27, 2026

They focused mainly on scalable Java backend architecture, microservices design, concurrency handling, performance optimization, system design decisions, and experience leading development teams in production environments.

1. Solid principles 2. Singleton pattern, in case if we pass hashmap- map can be altered and it will destroy singleton, how to handle that 3. How to create threads 4. How to execute 10 threads at a time 5. How to create global exception class 6. When to use arraylist and linkedlist 7. Completable in java 8 8. What's changed in hashmap in java 8 9. Deep copying and shallow copying 10. Use of volatile keyword in java 11. Programming a. String ="I love programming" -we need to count the length and arrange it in desc but that should be return as string using stream api b. List in = Arrays.asList(1,3,7,0,6,7,8,0); need to sort this and put only 0 at first and let the remaining stay as it is using stream API
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Java Lead Developer

Interviewed at Hexaware Technologies

3.7★
May 23, 2025

1. Solid principles 2. Singleton pattern, in case if we pass hashmap- map can be altered and it will destroy singleton, how to handle that 3. How to create threads 4. How to execute 10 threads at a time 5. How to create global exception class 6. When to use arraylist and linkedlist 7. Completable in java 8 8. What's changed in hashmap in java 8 9. Deep copying and shallow copying 10. Use of volatile keyword in java 11. Programming a. String ="I love programming" -we need to count the length and arrange it in desc but that should be return as string using stream api b. List in = Arrays.asList(1,3,7,0,6,7,8,0); need to sort this and put only 0 at first and let the remaining stay as it is using stream API

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