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Senior Full Stack Engineer Faria Education GroupAs a . Senior Full-Stack Engineer. , you’ll be a key player in a cross-functional Squad, owning end-to-end delivery of product features with a focus on AI. You'll contribute across the stack while helping drive product decisions, mentoring teammates, and influencing architecture and engineering standards.. Key Responsibilities:. . Own the design and implementation of robust, scalable full-stack features using Ruby on Rails and modern web technologies.. . Act as a product partner—collaborate with Product, Design, and stakeholders to shape features from problem to production.. . Drive technical decisions within the team and contribute to system architecture and long-term planning.. . Own large code areas and drive technical roadmaps, ensuring quality, performance, and maintainability.. . Identify and resolve performance bottlenecks, architectural risks, and complex bugs.. . Review code with an eye toward maintainability and long-term impact; promote engineering best practices.. . Mentor and guide engineers through technical challenges, design discussions, and code reviews.. . Improve development workflows, testing strategies, CI/CD pipelines, and observability.. . Proactively surface technical debt and propose solutions.. . . 5+ years of hands-on development experience with a focus on Ruby on Rails.. . Deep expertise in backend development, performance optimization, and scalable service design.. . Strong front-end development skills in JavaScript (ES6+), HTML5, CSS3, Bootstrap.. . Experience with MySQL, Redis, Memcached, and modern caching strategies.. . Strong with Background processing (DelayedJob, Sidekiq). . Experience with ActionCable (Anycable) and SSE.. . Experience with AWS services, S3 in particular.. . Strong grasp of Git, GitHub workflows, and GitHub Actions for CI/CD.. . Proven experience writing reliable tests using RSpec, Capybara, and Jest.. . Experience using and enforcing static and security analysis tools (Rubocop, Brakeman).. . Familiarity with Haml, ViewComponent, and optionally StimulusJS.. . Monitoring tools like Airbrake, NewRelic, Sentry.. . Bonus: Exposure to AI/ML features or tools.. Company Location: Poland.