KocharTech Backend Developer Interview Questions and Answers

Flatten and remove duplicates from an array of strings

• Use the flat() method to flatten the array

• Use the Set object to remove duplicates

• Convert the Set back to an array using the spread operator

Developed a web application for online shopping with microservices architecture using Node.js, Express, MongoDB, and React.

• Implemented microservices architecture to improve scalability and maintainability

• Used Node.js and Express for backend development

• Utilized MongoDB for database management

• Implemented React for frontend development

• Implemented business logic for user authentication, product management, and order proces...read more

Creating a RESTful API for a task management system using Node.js and Express, adhering to coding standards and SOLID principles.

• Use Express.js for routing: Example - app.get('/tasks', getTasks);

• Implement controllers to handle business logic: Example - const getTasks = (req, res) => { /* logic */ };

• Follow SOLID principles: Single Responsibility - each module should have one reason to change.

• Use middleware for error ...read more

I have used the Singleton, Factory, and Observer design patterns in my projects.

• Singleton pattern: Used to ensure a class has only one instance and provides a global point of access to it. For example, I implemented a Logger class as a Singleton to manage logging throughout the application.

• Factory pattern: Used to create objects without specifying the exact class of object that will be created. For instance, I used a F...read more

Use LINQ queries to retrieve order id and list of products based on latest project.

• Use OrderByDescending to get the latest project first

• Join Order and Product tables on OrderId

• Select OrderId and list of Products

Use SQL query with ORDER BY and LIMIT to get 2nd largest salary.

• Use SELECT statement to retrieve salary column

• Use ORDER BY clause to sort salaries in descending order

• Use LIMIT 1,1 to get the second row

The image reflects teamwork and innovation, aligning with our core values of collaboration and continuous improvement.

• Teamwork: The image showcases a diverse group working together, emphasizing our value of collaboration.

• Innovation: It highlights creative problem-solving, which is essential for our commitment to continuous improvement.

• Customer Focus: If the image depicts a service interaction, it reinforces our dedicat...read more

I would remain calm, listen actively, and address the situation professionally to resolve any issues.

• Stay calm and composed to avoid escalating the situation.

• Listen actively to understand the concerns being raised.

• Acknowledge the senior's feelings and express willingness to improve.

• Seek clarification on specific issues to address them effectively.

• Follow up after the incident to ensure the relationship remains positive.