Senior Fullstack Developer .NET React @ Link Group

Link Group; Warszawa; On-site; PLN 180,000 - 240,000; Full time

Job summary

Link Group is seeking a Fullstack .NET Developer to work on business applications in an Agile environment. You will focus on backend development in C#/.NET and frontend implementation in React 18+, while improving existing code, including legacy components.

The role suits someone who enjoys collaborating with delivery teams, values code quality, and contributes to solution design and architecture.

Qualifications

• Minimum 5 years of experience developing applications in .NET.
• Minimum 3 years of experience developing applications in React.
• Very good knowledge of C# and the .NET ecosystem: .NET Framework, .NET Standard, .NET Core, .NET.
• Experience with React 18+.
• Strong debugging, profiling, and performance analysis skills.
• Knowledge of DDD, Clean Code, and SOLID principles.
• Understanding of architectural patterns and asynchronous communication.
• Good knowledge of T-SQL and SQL Server Management Studio.
• Experience working with Visual Studio.
• English at B2 level or higher.
• Fluent Polish.

Responsibilities

• Develop software in C#/.NET based on technical and functional documentation.
• Implement frontend features in React.
• Analyse, maintain, and extend existing code, including legacy code.
• Contribute to solution architecture and technical design.
• Debug, profile, and analyse application performance.
• Collaborate closely with the delivery team: Testers, Analysts, and Product Owner.
• Work in Agile methodologies, especially Scrum.
• Ensure code quality, maintainability, and alignment with development best practices.

Skills

C#

React

.NET Framework

.NET Standard

.NET Core

T-SQL

SQL Server Management Studio

Visual Studio

DDD

Clean Code

SOLID

Asynchronous programming

English (B2+)

Polish (Fluent)

Tools

Postman

Playwright

WCAG

Job description

• Minimum 5 years of experience developing applications in .NET.
• Minimum 3 years of experience developing applications in React.
• Very good knowledge of C# and the .NET ecosystem:
  • .NET Framework,
  • .NET Standard,
  • .NET Core,
  • .NET.
• Experience with React 18+.
• Strong debugging, profiling, and performance analysis skills.
• Knowledge of DDD, Clean Code, and SOLID principles.
• Understanding of architectural patterns and asynchronous communication.
• Good knowledge of T-SQL and SQL Server Management Studio.
• Experience working with Visual Studio.
• English at B2 level or higher.
• Fluent Polish.

Nice to have

• Experience building views for mobile applications.
• Experience developing applications for the financial sector.
• Test automation experience, e.g. Postman, Playwright.
• Knowledge of WCAG accessibility standards.

We are looking for a Fullstack .NET Developer to work on the development of business applications in an Agile environment. The role combines backend development in C#/.NET, frontend implementation in React 18+, and analysis/improvement of existing code, including legacy components.

This position is a good fit for someone who enjoys working closely with a delivery team, cares about code quality, and can contribute not only to implementation but also to solution design.

Responsibilities

• Develop software in C#/.NET based on technical and functional documentation.
• Implement frontend features in React.
• Analyse, maintain, and extend existing code, including legacy code.
• Contribute to solution architecture and technical design.
• Debug, profile, and analyse application performance.
• Collaborate closely with the delivery team: Testers, Analysts, and Product Owner.
• Work in Agile methodologies, especially Scrum.
• Ensure code quality, maintainability, and alignment with development best practices.

Requirements: .NET, React, C#, .NET Framework, .NET Standard, .NET CORE, Debugging, DDD, Clean Code, SOLID, T-SQL, SQL Server Management Studio, Visual Studio, Mobile application, Financial sector, Postman, Playwright, WCAG