Serhii Doryba

Senior Full-Stack Software Engineer with 12+ years of experience building scalable web applications, SaaS products, and high-load systems for startups and established companies. My core expertise includes Ruby on Rails, React.js, JavaScript/TypeScript, Node.js, GraphQL, PostgreSQL, MySQL, Redis, Sidekiq, and cloud-based architectures. Throughout my career, I have been involved in the full software development lifecycle, from product discovery and architecture design to implementation, deployment, optimization, and long-term maintenance. I have worked closely with founders, product managers, designers, and distributed engineering teams to deliver reliable and user-focused solutions. Key areas of expertise: • Designing and developing scalable Ruby on Rails applications • Building modern React.js frontends and complex user interfaces • API development using REST and GraphQL • Performance optimization and database tuning • Background processing with Sidekiq and Redis • Real-time applications using WebSockets and ActionCable • Cloud infrastructure, CI/CD, and application monitoring • Technical leadership, mentoring, and code reviews I am passionate about solving complex technical challenges, improving product quality, and delivering business value through clean, maintainable, and efficient software solutions. Open to remote opportunities with product-focused teams where I can contribute both technically and strategically.