May 30, 2026
Fullstack Developer (React / TypeScript / .NET)
Mid • Hybrid
9,000 - 19,000 PLN
Katowice, Poland
Responsibilities
We are looking for a Full Stack Developer with a strong frontend focus who wants to work on modern web applications in an international environment.
You will design and develop scalable business applications, primarily using React and TypeScript, while also contributing to backend services and integrations. You collaborate closely with product owners, architects, and engineering teams to deliver end-to-end features across the full stack.
Your key responsibilities include:
Design, develop, and maintain modern web applications using React and TypeScript.
Implement responsive, user-friendly and high-performance frontend solutions.
Collaborate with backend engineers and architects to deliver end-to-end features.
Develop and maintain backend services and APIs using .NET technologies.
Troubleshoot, debug, and optimize application performance across frontend and backend layers.
Work in an agile environment with cross-functional and international teams.
Support application deployment, maintenance, and continuous improvement of systems.
Contribute to technical discussions and help ensure code quality and maintainability.
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 your 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
Completed university degree in Computer Science or a comparable technical field.
Strong experience with React and TypeScript in production environments.
Solid understanding of modern frontend architecture, performance, and best practices.
Experience building scalable and maintainable web applications.
Good understanding of REST APIs and backend integration concepts.
Experience with C# and .NET development.
Familiarity with agile methodologies and software development lifecycle.
Fluent English and Polish communication skills and ability to work in international teams.
Nice to have:
Experience with MongoDB or other NoSQL databases.
Knowledge of GraphQL and advanced API patterns.
Exposure to Microsoft Azure and cloud-native architectures.
Understanding of DevOps practices and CI/CD pipelines.
Experience working in enterprise-scale or distributed systems environments.
About Cluster Reply
Cluster Reply is the Reply Group company specializing in consulting and system integration of Microsoft technologies. As a Microsoft partner, Cluster Reply is active in Germany, Austria and Switzerland and works within the Reply network with sister companies in Brazil, Great Britain, Italy as well as the USA. The company focuses on innovation and supports customers in their digital transformation. The solutions range from on-premises to cloud applications in the areas of modern workplace and security, business applications, applications and infrastructure as well as data and artificial intelligence.
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