Senior Full-Stack Engineer (Ruby on Rails)

We are looking for a Senior Ruby on Rails Developer to join a product engineering team working on a mature, high-traffic platform with a large and well-established domain model.

Working Hours:
During the initial months, this role follows the US Eastern Time (EST) schedule, with working hours until approximately 00:00–01:00 Kyiv time. After a few months, the schedule shifts to partial overlap with the US team, working until approximately 20:00–21:00 Kyiv time.
 

Project: A long-running digital platform in the travel, hospitality, and marketplace domain. The product manages complex workflows around properties, reservations, deposits and exchanges, billing, and member onboarding. You'll work on a large Ruby on Rails application, contributing to new features, performance improvements, integrations, and the continuous evolution of the platform.
This is a backend-focused Rails role. You'll work primarily with Ruby on Rails, databases, background processing, APIs, and third-party integrations while contributing to a large and established codebase.
 

Tech Stack: Ruby, Ruby on Rails 7.x, Rails Engines, MySQL, Redis, Memcached, Solr, Sidekiq, Clockwork, ActionCable, ActiveAdmin.
Authentication & Security: JWT, CanCan, bcrypt, role-based authorization.
Integrations: Stripe, AWS S3/CloudFront/SNS, Twilio, transactional email, product analytics, feature flags, geolocation.
Testing: Minitest, RSpec, FactoryBot, VCR/WebMock, Capybara/Selenium.
 

     Responsibilities:

• Develop and deliver backend features using Ruby on Rails;
• Work effectively with a large, established Rails codebase and make well-tested, maintainable changes;
• Design and implement database changes, models, service objects, APIs, and business logic;
• Develop and maintain background jobs and scheduled processes using Sidekiq and related tools;
• Build and maintain integrations with third-party services such as Stripe, AWS, and Twilio;
• Write and maintain automated tests, including unit, integration, and API tests;
• Analyze and optimize application performance across the database, search, caching, and background processing layers;
• Contribute to improving system reliability, code quality, and maintainability;

• Participate in code reviews and collaborate closely with other engineers and product teams.

   

  Requirements:

• 4+ years of professional experience with Ruby on Rails, including production experience with large, established applications;
• Strong experience with Ruby on Rails 7.x;
• Solid knowledge of MySQL and/or PostgreSQL, including schema design, migrations, indexing, and query optimization;
• Strong experience with Sidekiq or similar background job processing tools;
• Experience building and maintaining RESTful APIs;
• Experience integrating third-party services and APIs;
• Strong testing experience with Minitest/RSpec and related testing tools;
• Experience with Git and pull-request workflows;
• Comfortable working with and improving a large, long-lived codebase;

• Good written English and clear communication skills.
   

  Nice to Have:

• Experience with JavaScript, Vue, Stimulus, or Hotwire;
• Experience with HTML, CSS, and Sass;
• Experience with Solr, Elasticsearch, or other full-text search technologies;
• Experience with Stripe or other payment and billing integrations;
• Experience with ActiveAdmin or similar admin frameworks;
• Familiarity with Docker and Kubernetes;
• Familiarity with CI/CD, including CircleCI or GitHub Actions;
• Familiarity with AWS, particularly S3, CloudFront, or SNS;
• Experience with monitoring and observability tools such as Prometheus or APM solutions;
• Experience with Playwright or other browser E2E automation tools;
• Experience maintaining Rails Engines or modularizing a monolith;
• Experience in travel, hospitality, or marketplace products.