Principal Software Developer (Ruby on Rails & React) - Freelancer
MonterailWarsaw, Masovian Voivodeship, Poland
Posted March 23, 2026
Contract / Temporary
About the Company
Monterail delivers custom software development for sectors like fintech and eCommerce with a skilled team.
Job Description
We're looking for a Principal Software Developer with 8+ years of experience in Ruby on Rails and React, and a strong sense of end-to-end ownership, with expertise in designing and maintaining robust test suites.
Requirements
- 8+ years of experience in software development
- Deep expertise in Ruby on Rails and React
- Senior-level commitment to quality
- Experience working closely with internal stakeholders
- Background in smaller-scale environments
- Self-directed, senior mindset