SDE-1 @PeopleStrong | Round1 | Java Backend Developer

I was asked to explain the key differences between Monolithic and Microservices architectural styles, outlining their respective advantages and disadvantages.

The interviewer asked for an explanation of the CAP Theorem, requiring me to define Consistency, Availability, and Partition Tolerance, and discuss its implications in distributed systems.

I had to describe the ACID properties (Atomicity, Consistency, Isolation, Durability) as they apply to database transactions.

I was asked to discuss various strategies and techniques to reduce API latency, including topics like caching, database optimization, asynchronous processing, Content Delivery Networks (CDNs), and load balancing.

The question involved explaining the working of the Circuit Breaker Pattern, specifically in the context of Resilience4j, and discussing its practical use cases in distributed systems.

I needed to explain different types of SQL indexes (Clustered, Non-Clustered, Covering, Composite), their advantages and disadvantages, and the underlying data structure used (B+ Tree).

I was asked to explain the differences between a Primary Key and a Foreign Key in relational databases.

I had to explain the difference between the final keyword and the finally block in Java.

The interviewer asked what a JSON Web Token (JWT) is, how it works, and its role in authentication and authorization processes.

I was asked to explain the key differences between authentication and authorization in the context of security.

I had to explain the differences between the @RestController and @Controller annotations in the Spring Framework.

Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', I had to determine if the input string is valid. An input string is valid if: open brackets must be closed by the same type of brackets; open brackets must be closed in the correct order; every close bracket has a corresponding open bracket of the same type. I was required to dry run the solution with inputs provided by the interviewer, covering multiple test cases and edge cases.