Senior Full-Stack Engineer

SUMMARY 💰 130 - 150 PLN/h (B2B) 💰 15 500 – 18 000 PLN brutto (UOP) 📍 Kraków (Hybrid - 3 days office / 2 days remote) 💼 Senior Project We are looking for a Senior Full-Stack Developer to build end-to-end web applications and supporting backend services. You will work across both frontend and backend layers, developing user-facing applications, internal portals, administrative consoles and backend-for-frontend services. The role combines modern React/TypeScript development with Java and Spring Boot backend engineering. You will collaborate across UX, integration and implementation, with a focus on building maintainable, performant and reusable solutions. You will Develop responsive web applications using React and TypeScriptBuild backend services and Backend-for-Frontend (BFF) APIs using Java and Spring BootCreate dashboards, admin consoles and workflow-oriented interfacesDesign reusable UI components and consistent interaction patternsIntegrate frontend applications with REST APIs, authentication flows and operational data sourcesContribute to automated testing across frontend and backend layersWork across UX, integration and implementation aspects of the applicationsBuild maintainable and performant solutions for platform users, administrators and internal teams Must have Strong experience building modern web applications with React and TypeScriptGood backend development experience with Java and Spring BootExperience designing and consuming REST APIsGood understanding of frontend state management and component architectureExperience with test automation across frontend and/or backendAbility to work across frontend, backend, UX and integration topicsStrong problem-solving skills and ability to work independently in a full-stack environmentGood English and fluent Polish Nice to have Experience building internal portals, operational dashboards or developer-facing toolsFamiliarity with design systems and accessibilityExperience with data visualization librariesExposure to WebSockets or Server-Sent Events (SSE)Experience with Material UI (MUI) Our offer Relocation package (4500 PLN total value), paid in three installments (1500 PLN per month) in case your permanent presence in the office is mandatory, and you need to relocate from another cityBenefits: Extended medical care (over 2000 medical facilities in Poland, 80 in Kraków) for you and your family; Multisport Benefit card; life insurance