Apexon Node JS Developer Interview Questions and Answers

Logical reasoning, grammar, and coding: two basic level questions.

Q1. Question on core Java
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Q2. Question on SQL and PLSQL
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Q3. Resume based question and on project
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Q1. Resume and project based question
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Q2. What do you like about your current company, and why do you want to join our organization?
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I appreciate the collaborative team environment and innovative projects at my current company, and I am excited about the opportunities for growth and learning at your organization.
• Collaborative team environment fosters creativity and productivity

• Innovative projects challenge me to learn and grow

• Excited about the opportunities for growth and learning at your organization
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Q1. Context api, js related qstns, simple programming qstn,
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Q2. Remove duplicates without using set.
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Remove duplicates from array of strings without using set.
• Iterate through the array and compare each element with all other elements to find duplicates.

• Create a new array and add elements only if they are not already present in the new array.
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Q1. Basic questions on Java concepts like OOPS, multi threading, stream. MySQL join queries
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Q2. Questions on Spring Boot and REST API
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Q1. Questions on currently working project?.
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Q2. Your contribution to the project and what challenges you faced?
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I contributed by developing new features and fixing bugs. Faced challenges with integrating third-party APIs.
• Developed new features such as user authentication and data visualization

• Fixed bugs related to database queries and UI responsiveness

• Challenges faced with integrating third-party APIs like payment gateways and social media platforms
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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.
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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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Q1. How annotation works?
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Annotations in Java provide metadata about a program that can be used by the compiler or at runtime.
• Annotations start with the @ symbol.

• Annotations can be used to provide information to the compiler or to runtime environments.

• Annotations can be used to define custom metadata for classes, methods, fields, etc.

• Annotations can also be used for code generation, documentation, and validation.

• Examples of annotations in Java ...read more
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Q2. CondurentSkipListMap, how does it work
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ConcurrentSkipListMap is a concurrent, sorted map implementation in Java.
• ConcurrentSkipListMap is a concurrent version of SkipListMap, which is a sorted map implementation based on skip list data structure.

• It allows multiple threads to access and modify the map concurrently.

• It provides logarithmic time complexity for most operations, making it efficient for concurrent access.

• Example: ConcurrentSkipListMap
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Q1. Dependency injection
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Q2. Check all oop questions
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Q3. Array related dsa
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Q1. Basic of java to advanced
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Q2. Array related questions
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Q1. Architecture related
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Q2. Management roles
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1 Assignment which you need to solve in front of the interviewer

Q1. Questions on Java Streams
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Q2. Questions on springboot
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