CDW India Software Developer Interview: Rounds, Questions and Preparation

What the job involves

A Software Developer in Indian IT services works on client projects, typically in a services or product engineering team. Day to day you write, test, and debug code, often in Java, .NET, or JavaScript, and coordinate with senior developers and QA. At fast-growing employers like CDW India, you may also support internal tools, integrations, or cloud-based solutions for enterprise clients.

Role and technical knowledge

1. 1

   Explain the difference between an array and a linked list, and when you would use each.

   Cover memory layout, access time, insertion and deletion costs, and give a real example like a fixed-size buffer versus a dynamic queue.

2. 2

   What are the four pillars of OOP? Give a small example of each.

   Name encapsulation, abstraction, inheritance, and polymorphism. Use a simple class like BankAccount to show each concept.

3. 3

   Write a SQL query to find the second highest salary from an Employee table.

   Show a subquery with MAX or use LIMIT with OFFSET. Mention handling ties or nulls if the interviewer asks.

4. 4

   What happens when you type a URL in a browser and press Enter?

   Walk through DNS lookup, TCP handshake, HTTP request, server response, and browser rendering. Keep it high level but accurate.

Practical scenarios

1. 5

   You are asked to fix a bug in a production application that you have never seen before. How do you approach it?

   Describe reproducing the issue, checking logs, using git blame or recent commits, writing a failing test, and then fixing and verifying.

2. 6

   Your code works on your machine but fails on the client's server. What could be different and how do you debug it?

   Mention environment variables, dependency versions, database connections, file paths, and using logs or remote debugging.

3. 7

   You need to add a new feature to an existing module with no documentation. What steps do you take?

   Talk about reading the code, asking senior developers, writing a small proof of concept, and adding tests before changing anything.

4. 8

   How would you design a simple to-do list application for a web client?

   Cover basic front end, a REST API, a database table, and CRUD operations. Mention authentication only if asked.

Behavioural and teamwork

1. 9

   Tell me about a time you had to learn a new technology quickly for a project or hackathon.

   Use STAR format. Highlight the steps you took, the resources you used, and the outcome or what you would do differently.

2. 10

   Describe a situation where you disagreed with a teammate's technical approach. How did you handle it?

   Show that you listened, presented data or trade-offs, and either reached consensus or escalated respectfully. Focus on the team goal.

3. 11

   Give an example of a time you missed a deadline or made a mistake in code. What did you do?

   Be honest, take ownership, explain how you communicated early, and what process you put in place to avoid repeating it.

HR and company fit

1. 12

   Why do you want to work as a software developer in an IT services company rather than a product company?

   Mention exposure to multiple domains, client-facing work, structured training, and the chance to learn different technologies quickly.

2. 13

   Are you willing to relocate or work in different shifts if a project requires it?

   Be honest but flexible. If you have constraints, state them clearly and show willingness to adapt where possible.

3. 14

   Where do you see yourself in three years?

   Focus on growing into a reliable developer, mastering one or two technologies, and taking on more ownership or mentoring juniors.

4. 15

   What do you know about our company and why does it interest you?

   Research the company's services, recent news, or values. Connect them to your skills and long-term goals without overclaiming.