Ruby Full-Stack Engineer

Softjourn is looking for a Middle or Senior Ruby Full-Stack Engineer to join their internal talent pool. The engineer may work on fintech, ticketing, or legacy Rails projects. The role involves developing features, maintaining systems, and using AI tools.

• drive technical design decisions, lead modernization and refactoring efforts, mentor Mid engineers, and take part in code audit projects.
• help define how AI tools are used on the project (guidelines, review rules, where AI output is and isn’t acceptable) and help PM identify AI-feature opportunities for clients.
• Develop new features and extend existing functionality in Ruby on Rails applications, from backend logic to UI.
• Maintain and support production systems: investigate and fix bugs, and release fixes.
• Refactor and optimize code for performance, maintainability, and security, and find bottlenecks.
• Build and maintain integrations with third-party services and APIs.
• Write and maintain automated tests (unit and integration) and keep code quality high through code reviews.
• Analyse and clarify requirements, and estimate tasks together with the PM, SA, BA, and the rest of the team.
• Communicate with team members and client stakeholders, and take part in Agile ceremonies (daily stand-ups, planning, demos).
• Use AI tools to speed up delivery (features, tests, documentation, onboarding into legacy code) while keeping code quality and security standards.
• Follow the project’s AI usage policy and flag any risks around data exposure or licensing.

• 3+ years of commercial experience with Ruby on Rails (5+ years for Senior), including Ruby 3.x and Rails 6/7+.
• Strong knowledge of PostgreSQL and/or MySQL, including data modeling, migrations, indexing, and query optimization.
• Experience with background jobs (e.g. Sidekiq) and caching (Redis).
• Experience building RESTful APIs and integrating third-party services and APIs.
• Solid JavaScript, HTML, and CSS skills. Experience with React, Hotwire (Turbo/Stimulus), or server-rendered templates (ERB/Slim/HAML).
• Hands-on experience with RSpec (plus FactoryBot and Capybara) and a habit of keeping test coverage meaningful.
• Practical use of AI-assisted development tools (GitHub Copilot, Claude Code, Cursor) or building AI-powered features via APIs.
• Proactive, responsible, and comfortable with ambiguity.
• English level: B2+.
• Nice to have: Applied knowledge of OOP, SOLID, MVC and design patterns.
• Nice to have: Experience with linters (RuboCop) and code reviews.
• Nice to have: Experience in payments or fintech, such as payment gateway integration (Stripe or similar), merchant processing, or Ticketing domain experience.
• Nice to have: AWS-hosted environments and CI/CD pipelines.
• Nice to have: Experience with code audits: static analysis tools, dependency vulnerability scanning, and producing a technical debt assessment and remediation plan.