A backend developer is responsible for the server-side of web development. They work on the code that runs on the server, connecting the web application to the database and ensuring that the front-end and back-end of the application work together seamlessly. Backend developers should have a strong understanding of programming languages such as Java, Python, Ruby, or PHP, as well as experience with databases and server-side frameworks.

Responsibilities:

• Design, develop, and maintain server-side code
• Create and implement RESTful APIs
• Connect the web application to the database
• Ensure the application is secure and scalable
• Write and maintain technical documentation
• Collaborate with front-end developers to ensure a seamless user experience
• Troubleshoot and debug server-side code
• Stay up-to-date with the latest technologies and industry trends

Requirements:

• Strong understanding of programming languages such as Java, Python, Ruby, or PHP
• Experience with databases (e.g. MySQL, MongoDB) and server-side frameworks (e.g. Express.js, Ruby on Rails)
• Experience with RESTful API design
• Familiarity with version control systems such as Git
• Strong problem-solving and debugging skills
• Strong written and verbal communication skills
• Bachelor’s degree in Computer Science or a related field

Interview Questions to Ask:

1. What programming languages are you proficient in?
2. Can you explain how you would design and implement a RESTful API?
3. How do you ensure that your server-side code is secure and scalable?
4. Can you walk me through a recent problem you solved and how you approached it?
5. Can you give an example of a time when you had to troubleshoot and debug server-side code?
6. How do you stay up-to-date with the latest technologies and industry trends?
7. Can you describe a time when you had to work with a difficult team member and how you handled it?
8. Can you give an example of a project you worked on that required a high level of collaboration with front-end developers?
9. Can you explain your experience with databases and server-side frameworks?
10. Can you explain how you handle testing and deployment of your server-side code?

Asking these questions can give you an idea of the candidate’s technical skills, problem-solving abilities, experience with industry tools and technologies, and communication and collaboration skills. It will help you to assess the candidate’s qualifications and fit for the role of a Backend Developer.