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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Bialystok, Poland

80 - 110 PLN

🏢 Summary: The role involves developing and maintaining scalable full-stack web applications using .NET and modern frontend frameworks. You will design robust Web APIs, optimize databases, and implement clean, testable code within CI/CD-driven environments. The position requires active participation in the full software development lifecycle for international projects. 🗂️ Requirements: Minimum 3 years commercial experience with .NET (C#, Web API, Entity Framework), Proficiency in Angular or React, Strong knowledge of JavaScript, HTML, CSS, Experience with SQL Server or PostgreSQL, Understanding of Unit Testing, Experience with Git, Experience with CI/CD pipelines, Knowledge of design patterns, Knowledge of software development best practices, Fluent English (min. B2), Availability for hybrid work mode 📃 Skills: .NET, C#, WebAPI, EntityFramework, Angular, React, JavaScript, HTML, CSS, SQL, SQLServer, PostgreSQL, UnitTesting, Git, CI/CD 🏢 Description: As a member of our development team, you will be responsible for building scalable web applications, designing robust APIs, and creating intuitive user interfaces. We value clean code, analytical thinking, and a proactive approach to technology. Our expectations: Minimum 3 years of commercial experience in .NET (C#, Web API, Entity Framework). Proficiency in Angular or React, along with JavaScript, HTML, CSS, and modern frontend libraries. Strong experience with relational databases such as SQL Server or PostgreSQL. Solid understanding of Unit Testing, Git, and CI/CD pipelines. Practical knowledge of design patterns and software development best practices. A collaborative mindset and the ability to explain complex technical issues clearly. Strong analytical skills and a "get it done" attitude. Fluent English (min. B2) for smooth collaboration with international partners. Open to work in hybrid mode. Main responsibilities: You will design, develop, and maintain scalable full-stack applications using .NET and modern frontend frameworks (Angular/React) for diverse client projects. You will be responsible for writing clean, testable code and implementing unit tests to ensure the highest software performance and reliability. You will work closely with cross-functional teams to architect robust Web APIs and optimize database schemas while following industry best practices and design patterns. You will actively participate in the full software development life cycle, including CI/CD processes and version control management, to ensure seamless project delivery.