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Monterail

Senior Ruby on Rails Developer - Freelance - Wrocław/Remote

Monterail Wrocław, Lower Silesian Voivodeship, Poland

Technology, Information and Internet · 51-200 employees

Sep 18
Remote rails Senior (5-10 yrs) Contractor Poland
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About the role

You will be responsible for developing back-office features and migrating business logic from a legacy MS SQL Server system to a modern Ruby on Rails and PostgreSQL stack. Additionally, you will build integrations with external systems and ensure high standards of code quality and data security.

What they look for

Ruby on Rails PostgreSQL AWS Next.js CI/CD Database design Data migration React Secure application design C# .NET Pundit Inertia.js Feature flags System integration

Requirements

The ideal candidate possesses solid commercial experience with Ruby on Rails and strong skills in relational database design and normalization. Familiarity with CI/CD environments, secure application design, and basic React knowledge is required.

Full description

Hi,

Hi! We are Monterail. A team of ~130 developers, designers, QAs and other technology professionals building innovative software everyday. We work with clients around the globe. We've helped businesses of all sizes develop outstanding digital products.

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.

Key ResponsibilitiesWhat you’ll be doing

  • 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

What we’re looking for

  • 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

Nice to have

  • 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

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