Senior Ruby on Rails Developer - Freelance
Offer summary

(Summary generated by AI based on the full job description)

Project targets the luxury travel & hospitality domain and focuses on migration from a legacy system. Tech stack includes Ruby on Rails, PostgreSQL, AWS and Next.js with trunk-based repo and CI/CD. Responsibilities include developing back-office features in Rails, modeling and normalizing the database, migrating data and business logic from MS SQL Server, building integrations with external systems and maintaining code quality and security when handling customer data.

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Senior Ruby on Rails Developer - Freelance

Company: Monterail Sp. z o.o.

from: 18 September 2026
to: 18 October 2026
120 - 140net (+ VAT)/ hr.B2B contract (full-time, part time)
Offer parameters
level:senior
working mode:remote • hybrid
location:Wrocław, Lower Silesia
Wrocław, Lower Silesia

Requirements

Expected technologies

Ruby on Rails
PostgreSQL

Optional technologies

Pundit
Inertia.js
C#
.NET

Our requirements

  • Solid commercial experience with Ruby on Rails
  • Skills in relational database design (normalization, data integrity)
  • Basic React familiarity
  • Awareness of working in a CI/CD and containerized environment infrastructure
  • Understanding of secure application design principles

Optional

  • Experience with data/system migrations, Pundit, Inertia.js, feature flags
  • Knowledge of C#/.NET
  • Experience in the travel/hospitality industry or in projects with a strong customer-care focus

Your responsibilities

  • Developing back-office features in Rails
  • Modeling and designing the PostgreSQL database with a strong focus on security and normalization (premium customer data)
  • Migrating data and business logic from the legacy system (MS SQL Server) — analyzing existing structures and porting them thoughtfully and securely
  • Building integrations with external systems (CRM, payment gateway)
  • Working with PM/PO to reconstruct domain logic from the old system
  • Maintaining code quality and security in the context of sensitive customer and billing data

About the project

We are currently looking for a Senior Ruby on Rails Developer to join one of our clients - a company operating in the luxury travel & hospitality space, managing an exclusive collection of premium properties across the Mediterranean.
Project Description
Our client's engineering team builds and maintains the internal tools that power the client-matching, sales, and operations workflows behind their business. The stack is Ruby on Rails + PostgreSQL (hosted on AWS) alongside Next.js, with a trunk-based repo, CI/CD, and multiple deploys per day. This role is focused on a migration project.
Role is based in Wrocław, Poland. 90% remote work with occasional office visits but Wrocław is important from a stategic perspective.

This is how we organize our work

This is how we work

in houseagilescrum

Team members

backend developerfrontend developerproduct ownerscrum master

This is how we work on a project

  • functional tests
  • integration tests
  • performance tests
  • test automation
  • unit tests
  • manual tests
Company

Benefits

  • remote work opportunities
  • flexible working time
  • no dress code
  • Freelance

Monterail Sp. z o.o.

We are Monterail - a team of ~ 130 experts working together to create meaningful software.
As a software agency, we collaborate with multiple clients.
We specialise in 4 main industries Fintech, MedTech, HRtech & E-commerce.
We work onsite and remotely!

This is how we work

Senior Ruby on Rails Developer - Freelance
120–140 zł / hr. (B2B)
I apply to:
Monterail Sp. z o.o.
Wrocław, Lower Silesia
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