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. 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;