We’re specifically looking for a Principal Software Developer (Ruby on Rails & React) - Freelancer
What We’re Looking For- 8+ years of experience in software development, with deep, senior-level expertise in Ruby on Rails and React
- A proven senior profile, someone who doesn’t just execute, but defines direction, shapes systems, and confidently makes architectural and product decisions
- Strong sense of end-to-end ownership: you are comfortable setting the roadmap, identifying gaps, and continuously building on top of existing systems without needing close guidance
- A senior-level commitment to quality, with extensive experience designing and maintaining robust test suites; testing is a core part of how you build, not an afterthought
- Clear and demonstrated focus on admin panels and internal tooling, with the maturity to design for usability, maintainability, and long-term evolution (not user-facing products)
- Experience working closely with internal stakeholders, with the communication skills and seniority to translate needs into well-structured solutions across varying levels of complexity
- Background in smaller-scale environments (e.g., internal tools, limited user bases), where pragmatic decision-making and thoughtful trade-offs are more important than hyper-scale concerns
- A self-directed, senior mindset, you bring structure to ambiguity, operate independently, and take responsibility for both the technical direction and its outcomes
Read more at Monterail Tech Network
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What We Do
Monterail is a full-service software development company with 130+ experts on board delivering meaningful software for the fintech, proptech, wellness, and eCommerce sectors. For over 13 years now, we use Ruby on Rails and Flutter to build beautiful web and mobile applications. We have delivered 390+ successful projects for over 235 clients from different parts of the world. In 2016 & 2017 we were recognized by Deloitte as one of the fastest-growing tech companies in Central Europe as well as listed in the Financial Times 1000 rank two times in a row, in 2018 and 2019.
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