Full-Stack Developer (.NET + React)

Quick Facts

• Contract: B2B
• Work model: Hybrid (1 day/week in the office in Katowice or Warsaw)
• Start date: 2026-12-01
• Duration: 12 months

Description

You will build and evolve modern banking applications in a microservices architecture using .NET, React, and GraphQL. The project includes both greenfield development and enhancements of existing solutions, with an emphasis on scalability, code quality, and modern architecture.

Responsibilities

• Design technical architecture and make architecture/design decisions
• Develop backend applications in .NET 6+ and frontend in React with TypeScript
• Design and implement microservices and GraphQL APIs
• Implement asynchronous communication with RabbitMQ and MassTransit
• Build greenfield solutions and evolve Micro Frontend architecture
• Work with SQL and NoSQL databases
• Write unit tests, improve GitLab CI/CD processes, run code reviews, and follow Clean Code and SOLID standards

Requirements

• Experience building backend applications with .NET Core and C#
• Experience building frontend applications with React
• Experience designing and implementing GraphQL APIs
• Experience implementing asynchronous communication with MassTransit and RabbitMQ
• Experience with Microsoft SQL Server and MongoDB
• Experience with Elasticsearch and CosmosDB
• Experience in banking-sector projects