Ruby on Rails Developer

About the Role

Senior Ruby on Rails Developer

What You’ll Be Doing

• Design, build, and maintain

  scalable Ruby on Rails applications

• Own features end-to-end: design → development → deployment → optimization
• Work with

  PostgreSQL

  and relational data modeling
• Deploy and manage applications on

  Heroku

• Build and consume

  RESTful APIs

• Write clean, testable, and well-documented code
• Collaborate with product, frontend, and architecture teams
• Debug production issues and improve performance & reliability
• Participate in technical decision-making and architecture discussions

Required Skills & Experience

• 6+ years of professional Ruby on Rails experience

• Strong understanding of

  Rails internals

  , MVC, ActiveRecord, background jobs
• Hands-on experience with

  Heroku

  (deployments, dynos, add-ons, logs, pipelines)
• Solid experience with

  PostgreSQL

• Experience building and maintaining

  REST APIs

• Strong Git workflow experience
• Ability to work independently in a remote, contract environment
• Excellent communication and ownership mindset

Nice to Have

• Experience with

  Redis

• Experience with

  RSpec / testing frameworks

• Exposure to

  AWS services

• Frontend familiarity (React / Hotwire / Stimulus)
• Experience working in consulting or product-led environments

Why Work With Cumulativ?

• Long-term contract stability

• Work on meaningful, real-world systems (not throwaway projects)
• Senior-level ownership and autonomy
• Clean engineering culture — quality over chaos
• Fully remote, async-friendly team
• Opportunity to extend contract and grow with us