Fullstack Developer (.NET / React)

Quick Facts

• Role: Fullstack Developer (.NET / React) — B2B
• Work mode: Hybrid (office visits in Katowice or Warsaw)
• Rate: 100–120 PLN/hour net + VAT (B2B)
• Project start: December 2026

Description

Join a project building and evolving modern applications supporting banking processes. The solution is developed in a microservices architecture using .NET, React, GraphQL, RabbitMQ, MassTransit, and a mix of relational and NoSQL databases. You will implement software and actively take part in technical architecture design, project decisions, and promoting engineering best practices.

Responsibilities

• Design technical architecture and participate in project decisions
• Develop backend applications in .NET 6+
• Create frontend applications with React, TypeScript, and JavaScript
• Develop microservices architecture and Micro Frontend (MFE) solutions
• Design and implement GraphQL APIs using Apollo Client and React Relay
• Implement asynchronous communication with RabbitMQ and MassTransit
• Design data models and work with Microsoft SQL Server, Elasticsearch, MongoDB, and CosmosDB
• Write unit tests with xUnit, NUnit, and Jest
• Build and maintain CI/CD pipelines in GitLab
• Apply design patterns and software best practices
• Prepare technical documentation
• Collaborate with architects, analysts, testers, and business stakeholders
• Use AI tools supporting the software development process
• Participate in code reviews and provide technical support to the team

Requirements

• Minimum 7 years of commercial .NET development experience
• Minimum 5 years of React web application development experience
• Minimum 2 years of GraphQL experience
• Minimum 1 year with MassTransit and/or Microsoft Orleans
• Experience independently designing technical architecture
• Practical knowledge of microservices architecture and greenfield projects
• Experience implementing asynchronous communication with RabbitMQ and MassTransit
• Experience working with relational and NoSQL databases
• Knowledge of CI/CD processes and experience maintaining them
• Experience working in Agile teams
• Experience conducting code reviews
• Ability to apply design patterns and software engineering best practices

Benefits

• Hybrid work with office visits in Katowice or Warsaw
• B2B contract with 100–120 PLN/hour net + VAT
• Greenfield and Micro Frontend work in a microservices ecosystem
• Use of AI tools supporting the development process