Role: Senior Java Developer | SDE2
College: Not Specified
Interview Date: April 11, 2024
Interview Type: Full-Time
Result: Not Specified (Candidate successfully navigated the round)
Difficulty: Medium (Based on LeetCode problem and theoretical questions)
Rounds: At least 1 round mentioned
Topics Asked: Java (Spring Boot starters, transaction management, isolation levels, ACID properties, propagation levels), SQL (inner joins), LeetCode problem.
Experience:
The candidate interviewed for an SDE2 position focusing on Java/Microservices. The first round was conducted by a third-party interview agency (InterviewVector).
Interview Round 1:
- Discussion on current project and tech stack.
- LeetCode Question: "Find and Replace Pattern" (https://leetcode.com/problems/find-and-replace-pattern/).
- Java Questions:
- What is the purpose of Spring Boot starters, and how do they simplify dependency management?
- What is Spring Boot Actuator and what are they used for?
- Explain the significance of transaction management in Spring Boot applications, focusing on the @Transactional annotation.
- Elaborate on the various isolation levels supported by transaction management and discuss scenarios where each isolation level is most appropriate.
- Define the four standard isolation levels in Java transactions (READ_UNCOMMITTED, READ_COMMITTED, REPEATABLE_READ, SERIALIZABLE). Explain briefly.
- Define transactions using the ACID properties (Atomicity, Consistency, Isolation, Durability). Explain the importance of transactions in maintaining data integrity in multi-user environments.
- Define the seven propagation levels in Java transactions (REQUIRED, SUPPORTS, MANDATORY, NESTED, NEVER, REQUIRES_NEW, NOT_SUPPORTED). Explain the implications of each level briefly.
- SQL Questions: Some questions related to basic SQL were also asked (inner joins, etc.).