Ruby Developer Interview Questions

joseph cole

Updated on March 2, 2023

Ruby Developer Position Overview

Ruby on Rails is one of the most popular frameworks for web application development. The main objective of this framework is to reduce the time and efforts required to build web applications. Top companies like Twitter, Hulu, eBay and Scribd have already capitalized on this lucrative framework. Even small and medium-sized companies are now joining the long list of RoR fans. The success stories of Ruby on Rails has created a huge demand for Ruby Developers in the market.

A Ruby Developer writes server-side web applications in Ruby, around the Rails framework. He builds back-end components; connects the application with other web services; and also supports the front-end developers by integrating their work with the application.

Due to the convention-over-configuration nature of this framework, you need to hire a Ruby Developer with complete knowledge and skills to work on Rails framework.

Qualification to look for:

  • Bachelor’s Degree in Computer Science/Engineering from a reputed institute

Technical skills to look for:

  • Excellent knowledge of Ruby & Ruby on Rails
  • Great OO skills
  • Database schema design, and SQL
  • Knowledge of HTML5, CSS3, and JavaScript
  • Knowledge of Unix

Non-technical skills to look for:

  • Excellent communication skills
  • Ability to work in team
  • Willingness to learn

You first need to analyze their fundamental arithmetic knowledge and figure out how would they find/think/sort logic.  Test their understanding of databases and analyze their approach to modelling. Other things that you should ask include:

  • How do you stay updated with the latest developments in your field?
  • What are your favourite technical books and blogs?
  • Are you active on Github?
  • Have you worked on any open source software?
  • Do you participate in Hackathons?

These questions will help you figure out their intellectual interest in Ruby on Rails framework.

In short, you have to figure out the strength of their intellectual interest in the related field. All these Ruby developer interview questions will lead your way to the committed and inquisitive candidate.

Computer Science Interview Questions

  • What is the difference between an object and a class?
  • What is polymorphism?
  • Reverse a string iteratively and recursively using pseudo-code.

Role-specific Interview Questions

  • How does Rails implement AJAX?
  • What is the difference between Active Support’s “HashWithIndifferentAccess” and Ruby’s “Hash”?
  • What are the benefits of using Ruby on Rails?
  • Explain the three levels of method access control for classes and modules.
  • What is RubyGems? How does it work?
  • Explain the use of load and require in Ruby.
  • Explain the difference between Page, Fragment, Action, Low-Level, SQL caching techniques.
  • Define duck typing? Explain a use case. How will you differentiate block from Proc?
  • What do “==” and”===” mean?
  • Explain the difference between Render and Redirect_to?
  • What is Request.xhr?

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