Gainwell Technologies Software Developer Interview Questions and Answers

Q1. Basic Java Question
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Q2. Spring Boot related questions
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Q1. Design a rest API and code it.
Ans. 
Design and code a REST API for a software developer interview.
• Define the endpoints and HTTP methods for the API (e.g. GET /users, POST /users)

• Implement authentication and authorization mechanisms (e.g. JWT tokens)

• Use proper status codes for responses (e.g. 200 OK, 401 Unauthorized)

• Include error handling and validation for input data

• Document the API using tools like Swagger or OpenAPI
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Q2. Questions related to JPA HIBERNATE SQL
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Q1. Discussion related to Last company Project and architecture level questions
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Q2. Write code to calculate frequency of a word using Stream API and lambda expressions
Ans. 
Calculate word frequency using Stream API and lambda expressions
• Use Stream API to convert array of strings to stream

• Use Collectors.groupingBy to group words by their frequency

• Use Collectors.counting to count the occurrences of each word
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DSA questions and programming concepts

Q1. Reverse string and optimize it
Ans. 
Reverse array of strings efficiently
• Use two pointers approach to swap characters from start and end of each string

• Optimize by using in-place reversal instead of creating new strings

• Consider edge cases like empty strings or strings with only one character
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Q2. Reverse binary tree
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Q1. Salary expectations
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Q2. Joining location
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Q1. What is Concrete class ?
Ans. 
A concrete class is a class that can be instantiated, meaning it can be used to create objects.
• Cannot be abstract

• Can be instantiated

• Can have concrete methods and properties

• Example: class Car {}
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Hackerrank coding round.

Q1. Questions and coding testing your OOPS knowledge
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Q1. Every tech stack, SQL, OOPS, JAVA
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How to reverse linked list.

Q1. What selection sort.
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Q2. What is dynamic memory allocation.
Ans. 
Dynamic memory allocation is the process of allocating memory during program execution.
• Allows programs to request memory at runtime

• Helps in efficient memory management

• Commonly used in languages like C and C++

• Example: using malloc() function in C to allocate memory for an array
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Q1. Question are about interview
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Q2. Answers about interview
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Q1. Kubernetes internals
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Q2. Spring boot internals
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Q1. OOP, SQL, Collection, algorithms, threads
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