Experience with Ruby on Rails, along with other common libraries such as RSpec and Resque

Good understanding of the syntax of Ruby and its nuances

Solid understanding of object-oriented programming

Good understanding of server-side templating languages {{such as Liquid, Slim, etc depending on your technology stack}}

Good understanding of server-side CSS preprocessors {{such as Sass, based on project requirements}}

Basic understanding of front-end technologies, such as JavaScript, HTML5, and CSS3

Familiarity with concepts of MVC, Mocking, ORM, and RESTful

A knack for writing clean, readable Ruby code

Ability to integrate multiple data sources and databases into one system

Understanding of fundamental design principles behind a scalable application

Able to create database schemas that represent and support business processes

Able to implement automated testing platforms and unit tests

Proficient understanding of code versioning tools {{e.g. Git, Mercurial or SVN}}

Familiarity with development aiding tools {{such as Bower, Bundler, Rake, etc}}.

Familiarity with continuous integration