Full-Stack Java & React Developer

Quick Facts

• Hybrid role with 2–3 days onsite in Kraków
• Focus: full-stack development using Java (backend) and React.js (frontend)

Description

You will design, develop, and maintain scalable, high-performance web applications across backend services and rich frontend interfaces. The role covers RESTful APIs and microservices on the backend, and component-driven, responsive UI development in React on the frontend.

Responsibilities

• Architect, implement, and maintain backend services using Java and Spring Boot
• Build modular, maintainable React.js applications with component-driven design
• Design and implement RESTful APIs and microservices with performance, security, and scalability in mind
• Collaborate with cross-functional teams on technical requirements, system architecture, and feature implementation
• Apply unit, integration, and end-to-end testing best practices
• Participate in code reviews and promote clean code, SOLID, and design patterns
• Troubleshoot and optimize application performance and resolve production issues
• Manage CI/CD pipelines, automate deployments, and support DevOps practices

Requirements

• Strong experience with Java and Spring Boot
• Solid experience with React.js and Redux/state management libraries
• Experience designing and consuming RESTful APIs and microservices architecture
• Proficient in JavaScript, HTML5, CSS3, and modern frontend tooling (Webpack, Babel, ESLint)
• Experience with relational databases (MySQL, PostgreSQL) and/or NoSQL databases
• Familiarity with Git, version control workflows, and Agile/Scrum methodologies
• Understanding of unit testing, integration testing, and TDD (JUnit, Mockito, Jest, React Testing Library)
• Good problem-solving and communication skills in English

Benefits

• Hybrid working model (2–3 days per week onsite in Kraków)
• Opportunity to work on scalable, high-performance applications using modern full-stack technologies