31 Common Back-End Developer Interview Questions
The following are some of the most common questions asked to back-end developers during interviews:
- How would you describe yourself as a developer?
- Tell me about a project that you have worked on recently. What was the goal, and how did you accomplish it?
- What is an object model?
- How would you implement a simple user authentication system?
- What is the difference between polymorphism and inheritance?
- What is the difference between serialization and deserialization?
- What is the difference between concurrency and parallelism, and what are some examples of both?
- Explain how to cache a database query, and when it makes sense to do so.
- What is a database?
- What are the main functions of a database?
- How do you create a database in SQL?
- What is the difference between MySQL and PostgreSQL?
- How do you connect to a database from PHP?
- What are some of the tools you use for back-end development?
- What are your favorite technologies?
- What is your opinion on the coding style?
- How do you feel about code reuse?
- How do you handle errors in your code?
- What's the best way to handle a bug report?
- What is your favorite programming language? Why?
- What is your favorite feature of your favorite programming language?
- What are some pros and cons of your favorite programming language?
- How would you design an API for an e-commerce website if it had to support both mobile and desktop applications written in Javascript, HTML5, and CSS3?
- What do you know about our product?
- What would you say is the most challenging part of this job?
- What's the biggest mistake you've made in the past, and how did you handle it?
- How does a project get from idea to finished product?
- What's your favorite thing about working for [company name]?
- What is your biggest weakness?
- What are the most important skills that a back-end developer should have?
- Why should we hire you instead of someone else?