Senior Full-Stack Developer (.NET + React)

Quick Facts

• Role: Senior Full-Stack Developer (.NET + React)

• Focus: Banking-sector software development using microservices and Micro Frontend architecture

• Compensation: 140 PLN/h + VAT (B2B)

Description

You will design technical architecture and build modern solutions for the banking sector, including greenfield initiatives, microservices, and Micro Frontend (MFE) setups. The work includes backend development in C# and .NET 6+, frontend development with React/TypeScript/JavaScript, GraphQL API design, and asynchronous messaging with RabbitMQ/MassTransit. You will also contribute to quality, performance, scalability, testing, documentation, and CI/CD in an Agile environment.

Responsibilities

• Design technical architecture and develop greenfield and microservices solutions, including Micro Frontend (MFE)

• Implement backend services in C#/.NET 6+ and frontend features in React with TypeScript/JavaScript

• Design GraphQL APIs (Apollo Client, React Relay) and implement async communication using RabbitMQ and MassTransit

• Work with Microsoft SQL Server and NoSQL databases: Elasticsearch, MongoDB, CosmosDB

• Create and maintain unit tests using xUnit/NUnit/Jest

• Build and maintain CI/CD pipelines in GitLab

• Ensure code quality, performance, scalability; apply SOLID and Clean Code; run Code Reviews and prepare technical documentation

• Collaborate with architects, analysts, testers, and business stakeholders in Agile

• Work in a hybrid model

Requirements

• Minimum 7 years of commercial experience with .NET (C#, .NET 6+)

• Minimum 5 years of commercial experience building React web applications (TypeScript, JavaScript)

• Minimum 2 years with GraphQL (Apollo Client, React Relay) and at least 1 year with MassTransit and/or Microsoft Orleans

• Experience designing architecture independently, including greenfield work and microservices/MFE solutions

• Knowledge of Microsoft SQL Server, Elasticsearch/MongoDB/CosmosDB, and RabbitMQ async communication

• Practical unit testing knowledge (xUnit, NUnit, Jest) and GitLab CI/CD

• Very good knowledge of SOLID, Clean Code, design patterns, and UI/UX principles

• Experience working in Agile, conducting Code Reviews, and making independent technical decisions

Benefits

• Hybrid work model

• B2B rate: 140 PLN/h + VAT