Wrocław, Lower Silesian Voivodeship, Poland Remote (Global)

Monterail is hiring a Principal Software Developer (Ruby on Rails & React) - Freelancer

Lead the technical vision for internal platforms by designing and refining system architecture in Ruby on Rails and React. As a Principal Software Developer, you'll operate independently to translate business needs into sustainable, well-structured applications, with a particular focus on admin interfaces and internal tooling used across small to mid-sized teams.

What You'll Do

  • Define and drive the technical roadmap, making strategic decisions that balance immediate needs with long-term scalability
  • Architect and evolve backend and frontend systems with an emphasis on clarity, maintainability, and usability
  • Design and implement comprehensive test suites as a foundational part of development
  • Collaborate with stakeholders to understand requirements and deliver effective, well-scoped technical solutions
  • Identify gaps in current systems and propose practical improvements with clear trade-off analysis
  • Take full ownership of technical outcomes, from concept through implementation and beyond

What We're Looking For

  • At least 8 years of hands-on software development experience
  • Deep proficiency in Ruby on Rails and React, with a track record of leading technical direction
  • Proven ability to work autonomously and bring structure to complex, ambiguous problems
  • Experience building internal tools and admin panels for limited user bases
  • Strong commitment to code quality, testing, and long-term system health
  • Clear communication skills and the maturity to engage with stakeholders at all levels
  • A pragmatic mindset focused on sustainable, thoughtful engineering decisions
Required Skills
Ruby on RailsReact.jsSoftware ArchitectureProblem Solving
Freelancing without stability?

Get steady projects, keep your freedom

Iglu connects you with international clients and handles contracts, payments, and admin. You get consistent work and flexibility — no more chasing invoices or worrying about gaps.

Consistent client projects
Contract & payment management
Flexible work schedule
Revenue-sharing compensation
See open positions
Work from anywhere
About company
Monterail
A team of over 130+ experts working together to create meaningful software.
All jobs at Monterail Visit website
Job Details
Category fullstack
Posted 3 months ago