Senior Fullstack Developer .NET + React

Madiff; Warszawa; Hybrid; PLN 180,000 - 260,000; Full time

Benefits offered by this job

On-site 1 day/week

Warsaw/Gdańsk on-site availability

Healthcare

Job summary

Madiff is seeking a Senior Fullstack Developer to join a new project delivering modern financial services solutions. The role targets ~70% backend with C#/.NET and 30% frontend with React 18+, using T-SQL, microservices, DDD, Clean Code and SOLID guidelines.

You will develop new functionalities, work with legacy code, contribute to solution architecture and collaborate with Developers, Testers, Analysts and the Product Owner in a Scrum environment.

Qualifications

• Minimum 5 years of commercial .NET development.
• Minimum 3 years of commercial React development.
• Experience in debugging and profiling.
• Experience in performance analysis.

Responsibilities

• Frontend development in React
• Analysis and development of existing and legacy code
• Debugging, profiling and performance analysis
• Development of new functionality
• Work with TSQL and relational databases
• Cooperation with Developers, Testers, Analysts and Product Owner
• Work within Scrum

Skills

Backend development

Frontend development

Scrum experience

Tools

React.js

.NET

T-SQL

Microservices

DDD

Clean Code

SOLID

Job description

We are looking for a Senior Fullstack Developer (.NET + React) to join a new project focused on developing modern solutions for the financial services sector. The role is approximately 70% backend and 30% frontend, involving C#/.NET, React 18+, T-SQL, microservices, DDD, Clean Code and SOLID. You will develop new functionalities, work with existing and legacy code, contribute to solution architecture, and collaborate with Developers, Testers, Analysts and the Product Owner in a Scrum environment.

Responsibilities

• Frontend development in React


• Analysis and development of existing and legacy code


• Debugging, profiling and performance analysis


• Development of new functionality


• Work with TSQL and relational databases


• Cooperation with Developers, Testers, Analysts and Product Owner


• Work within Scrum

Requirements

• Minimum 5 years commercial .NET development


• Minimum 3 years commercial React development


• Debugging and profiling


• Performance analysis

Nice to have

• Financial services / banking experience


• Automated testing


• Flexible hybrid work model (1 day/week on-site in Warsaw/Gdańsk)


• Work in a multinational environment on international projects


• Comprehensive healthcare


• Long-term B2B contract with a stable project pipeline