Ruby Developer Interview Questions

Ready to find your next A-game Ruby Developer? These sample interview questions will help you find the right candidates during the interview process.

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Ruby Developer qualifications to look for

A Ruby developer builds anything from the backend of a web application to command line utilities using Ruby language.

Your top Ruby developer can develop backend components, connect the application to other third-party web services, and support the front-end developers by integrating their work with the Ruby application.

Keep an eye out for candidates who have:

  • Excellent communication skills
  • Team-playing attitude
  • The drive to constantly learn 
  • An understanding of basic algorithmic concepts
  • A wide understanding of databases

Though a degree seems attractive, this position is more about how voracious a learner your Ruby Developer is. 

Your best candidates will participate in hackathons, be active in tech forums, and have a strong interest in learning the latest technologies. 

Top tip: Hire candidates willing to grow by making sure their personal career goals align with your company's mission.

Ruby Developer interview questions

  • Explain whether arguments in Ruby get passed by reference or by value.
  • Explain if Ruby is a statically or dynamically typed language. 
  • Using a pseudo-code, reverse a String iteratively and recursively.
  • Describe what makes a good unit test. What makes a functional one?
  • What is the difference between polymorphism, inheritance, and encapsulation?
  • Describe the tools and processes you use for linting, debugging and profiling.
  • What are three levels of method access control for classes and modules? What do they imply about the method?
  • Explain in simple terms Lambda expression forms a closure.
  • Explain the use of load and require in Ruby. 
  • Write a module Foo that when included, adds an instance method :bar and a class method qux.
  • Describe a use case for duck typing.
  • Explain the difference between a block different and a Proc.

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