Senior Ruby Developer

Ready to find your next innovative Senior Ruby Developer? These sample interview questions will help you find the right candidates for your team.

Senior 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 Senior Ruby Developer has extensive experience developing back-end components, connecting the application to other third-party web services, and supporting the front-end developers by integrating their work with the Ruby application.

Keep an eye out for candidates who have:

  • Excellent communication skills
  • A 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 Senior 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.

Role-specific interview questions

  • When is the best time to set up its test infrastructure in a project’s lifecycle?
  • What are you looking for in a regression test suite?
  • Explain whether arguments in Ruby get passed by reference or by value.
  • Describe the tools and processes you use for linting, debugging and profiling.
  • If Ruby MRI uses a Global Interpreter Lock. Does this mean it uses real threads?
  • Using pseudo-code, reverse a String iteratively and recursively
  • Is it possible to have a producer thread reading from the network and a consumer thread writing to a file, really work in parallel? What about the GIL?
  • Describe how the generational garbage collection introduced in Ruby 2.1 works. How was it an improvement over the last version? 
  • Write a single line of Ruby code that prints the Fibonacci sequence of any length as an array.
  • Describe what makes a good unit test. What makes a functional one?
  • What are the core principles of a REST API and RPC?
  • Explain in simple terms Lambda expression forms a closure.
  • Explain the difference between a block different and a Proc.

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