Lead Fullstack Developer (React, Java) w Poland, Katowice

Responsibilities Design, develop, and maintain applications using Java, TypeScript, and modern web technologies. Build responsive and user-friendly interfaces using React and Material UI. Implement and maintain frontend components using JSX/TSX, Function Components, Hooks, and Custom Hooks. Develop and integrate backend services following object-oriented design principles. Collaborate with team members to design technical solutions and deliver new product features. Write clean, maintainable, and well-tested code, ensuring high quality and reliability. Participate in code reviews and contribute to improving development standards and best practices. Troubleshoot, debug, and optimize application performance across the full technology stack. Take ownership of the product and the solutions you build, from implementation to production support. Proactively contribute ideas and technical improvements to create innovative solutions. Work in an agile environment using Agile practices. Meet with your team in our Katowice office at least once a month to plan work, collaborate, and discuss progress. Benefits Motivizer Benefits Platform to choose and manage all your benefits in one place. You receive a budget (550 PLN monthly). You can choose medical care package, meal tickets, sports cards (we have Multisport and on preferential terms, we have membership cards to one of the most popular Gyms), cinema tickets, shop vouchers, discounts and many more. Language Courses – you'll have access to a multi-language learning platform enabling you to practice you language skills and learn new ones! Regular and systematic further training opportunities - both internally and from external providers. We support your ongoing learning and development. Cooperation within an internal community is our everyday reality. We have networking events, coding challenges, and company parties for different occasions. Qualifications At least 7 years of experience working as a Frontend Developer or Fullstack Developer. Experience with object-oriented software development in Java. Knowledge of web development technologies, including HTML, CSS, and TypeScript. Basic understanding of the React framework, Material UI and concepts such as JSX/TSX, Function Components, Hooks, Custom Hooks, and State Management. Experience using AI-assisted development tools (e.g., GitHub Copilot, ChatGPT, Claude, Cursor, or similar) to improve productivity, code quality, and development efficiency. Strong understanding of software architecture, design patterns, and scalable application design. Ability to identify risks, proactively address challenges, and support the team in achieving project goals. Strong stakeholder management and communication skills, with the ability to explain technical concepts to non-technical audiences. Ability to mentor, coach, and support developers at different experience levels. Good communication skills in English and Polish and the ability to work effectively within a team. Communication skills in German is a plus. Successful completion of higher education as a qualified IT specialist or university degree in computer science. Develop yourself and the digital future – at Reply! Reply specialises in designing and implementing solutions based on new communication channels and digital media. Structured as a network of highly specialised companies, Reply supports leading European industrial groups in sectors such as Telco & Media, Industry and Services, Banking and Insurance, and Public Administration, helping define and develop business models enabled by new paradigms such as AI, Cloud Computing, Digital Media, and the Internet of Things. Reply’s services include Consulting, System Integration, and Digital Services.