Incedo Inc India Java Developer Interview: Rounds, Questions and Preparation

What the job involves

As a Java Developer at Indian IT services firms like Incedo Inc India, you will build, test, and maintain Java-based applications for clients across domains such as BFSI, healthcare, and telecom. Day to day, you will write clean code, fix bugs, participate in agile ceremonies, and collaborate with senior developers and QA teams. Freshers typically start with training on Java, Spring, and SQL before moving to project work.

Role and Technical Knowledge

1. 1

   Explain the difference between JDK, JRE, and JVM.

   A strong answer defines each term clearly and explains how they relate: JVM runs bytecode, JRE includes JVM plus libraries, JDK includes JRE plus development tools.

2. 2

   What are the main principles of OOP in Java? Give a short example of each.

   Cover encapsulation, inheritance, polymorphism, and abstraction with a one-line Java example for each, such as using private fields with getters for encapsulation.

3. 3

   How does a HashMap work internally in Java?

   Mention hashing, buckets, equals and hashCode contracts, and how collisions are handled with linked lists or trees in Java 8 and later.

4. 4

   What is the difference between an interface and an abstract class in Java?

   Explain that interfaces support multiple inheritance of type and abstract classes can hold state and constructors. Give a scenario where you would choose one over the other.

Practical Scenarios and Coding

1. 5

   Write a Java program to reverse a string without using StringBuilder or StringBuffer.

   Show a loop that builds a new string or uses a character array. Explain time and space complexity and mention edge cases like null or empty input.

2. 6

   How would you find the second largest number in an array?

   Describe a single-pass approach with two variables, handle duplicates and arrays with fewer than two elements, and state the O(n) time complexity.

3. 7

   You need to connect a Java application to a MySQL database. What steps and classes would you use?

   Mention loading the driver, using DriverManager or a connection pool, creating Statement or PreparedStatement, executing queries, and closing resources in finally or try-with-resources.

4. 8

   Given a table of employees, write a SQL query to find the second highest salary.

   Use a subquery with MAX and a condition, or use LIMIT with OFFSET. Explain how you would handle ties and null values.

Project and Internship Experience

1. 9

   Walk me through a Java project you built during college or an internship.

   Use the STAR format: describe the problem, your role, the technologies used, and the outcome. Highlight one technical challenge you solved.

2. 10

   How did you test your code in that project?

   Mention unit testing with JUnit, manual testing with sample inputs, and any debugging tools you used. If you did not test formally, say what you would do differently now.

3. 11

   What was the most difficult bug you faced and how did you fix it?

   Pick a real bug, explain how you isolated it, what tools or logs you used, and what you learned to prevent similar issues.

4. 12

   If your project used a database, how did you design the tables and relationships?

   Talk about normalization, primary and foreign keys, and why you chose a particular schema. Keep it simple and honest if it was a small project.

Behavioural and HR Questions

1. 13

   Why do you want to join a services company like Incedo Inc India rather than a product company?

   Focus on exposure to multiple domains, client-facing work, structured training, and learning opportunities. Avoid saying it is only a backup option.

2. 14

   Are you comfortable relocating to a different city or working in rotational shifts?

   Be honest but positive. If you are flexible, say so and give a reason. If you have constraints, state them politely and show willingness to adapt.

3. 15

   Tell me about a time you worked in a team to meet a deadline.

   Use a college project or hackathon example. Describe your specific contribution, how you coordinated, and the result. Keep it concise.

4. 16

   Where do you see yourself in three years?

   Show a realistic path: strong developer, learning new technologies, taking ownership of modules, and possibly mentoring juniors. Align it with the company's growth.