Fullstack Developer (React + Ruby on Rails

📍 Location: Wrocław, Poland (Hybrid)📅 Employment Type: Full-time, B2B (up to 18.000PLN net monthly)/CoE (up to 14.000PLN gross monthly)🏢 We are hiring for our client (life sciences / SaaS R&D domain)About the ProjectWe are currently looking for an experienced Full Stack Developer (Ruby on Rails) on behalf of our client — an innovative company operating in the life sciences sector.You will join an R&D team working on a cutting-edge platform used by scientists and research organizations worldwide. The platform focuses on laboratory data management, workflow automation, and AI-powered tools that support research and production processes.ResponsibilitiesDesign and implement new features across the full stackDevelop and maintain platform APIs with a strong focus on scalability, reliability, and performanceWrite clean, well-tested, and maintainable code following TDD and iterative practicesCollaborate closely with product and business teams to translate requirements into technical solutionsContribute to building scalable solutions deployed as:multi-tenant SaaSsingle-tenant SaaSon-premise systemsEnsure application security, performance optimization, and system scalabilityLeverage AI-assisted tools to accelerate development, testing, and code qualityActively contribute to team collaboration and a positive engineering cultureRequirements✅ Must-haveAt least 3 years of frontend development experience in large-scale web applicationsStrong proficiency with:ReactJavaScriptHTML / CSSPractical familiarity with Ruby on Rails (ability to read and contribute to existing codebases)Degree in Computer Science or equivalent experience✅ Nice to haveExperience with:Redux Toolkit / LitAWS / CI/CD pipelinesDockerMySQLElasticSearchExperience using AI tools in development (e.g., coding assistants, automated testing, code review)Exposure to integrating AI workflows into the SDLCCandidate ProfileStrong team player with excellent communication skills (technical and non-technical)Comfortable working in a fast-paced, agile environmentOpinionated about code quality and technology usage, while remaining pragmaticPassionate about building meaningful productsOpen to adopting AI tools as part of daily development workflowsHays Poland sp. z o.o. jest agencją zatrudnienia zarejestrowaną w rejestrze prowadzonym przez Marszałka Województwa Mazowieckiego pod numerem 361.