About the Role
Cumulativ Consulting is looking for a Senior Ruby on Rails Developer to join us on a long-term contract basis for US based client . You’ll be working on production-grade applications used by real customers, collaborating with a lean, senior team that values clean architecture, scalability, and ownership.
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 experienceStrong understanding of Rails internals , MVC, ActiveRecord, background jobsHands-on experience with Heroku (deployments, dynos, add-ons, logs, pipelines)Solid experience with PostgreSQLExperience building and maintaining REST APIsStrong Git workflow experienceAbility to work independently in a remote, contract environmentExcellent communication and ownership mindsetNice to Have
Experience with RedisExperience with RSpec / testing frameworksExposure to AWS servicesFrontend familiarity (React / Hotwire / Stimulus)Experience working in consulting or product-led environmentsWhy Work With Cumulativ?
Long-term contract stabilityWork on meaningful, real-world systems (not throwaway projects)Senior-level ownership and autonomyClean engineering culture — quality over chaosFully remote, async-friendly teamOpportunity to extend contract and grow with us