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Senior Full Stack Developer (.NET + React)

Madiffgroup — Poland · Posted ~21 hours ago

Senior

Skills

C# .NET React T-SQL Microservices DDD Clean Code SOLID Relational databases Software architecture Performance analysis Scrum .NET Core

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Summary ✨ AI‑Generated

A senior Full Stack Developer opportunity with an approximately 70/30 backend-to-frontend split. You will work with C#/.NET, React, T-SQL, microservices, domain-driven design, Clean Code, and SOLID principles while developing new functionality and improving existing systems. The role also includes solution architecture, debugging, profiling, performance analysis, and collaboration with a multidisciplinary Scrum team.

Highlights

Senior full-stack role with a backend-heavy focus, combining modern .NET and React development with solution architecture, microservices, domain-driven design, performance optimization, and Scrum collaboration. The position offers meaningful involvement in both new functionality and existing systems.

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 • Development in C# / .NET • Frontend development in React • Analysis and development of existing and legacy code • Solution architecture • 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 • Strong C# • .NET Framework / .NET Standard / .NET Core / modern .NET • React 18+ • TSQL • Debugging and profiling • Performance analysis • DDD • Clean Code • SOLID • Architectural patterns • Asynchronous communication • SQL Management Studio • Visual Studio • Fluent Polish • English minimum B2 Nice to have • Financial services / banking experience • Mobile application views • Automated testing • Postman • Playwright • WCAG Benefits • Flexible hybrid work model (1 day/week on-site in Warsaw/Gdańsk) • Solid, competitive salary • Work in a multinational environment on international projects • Comprehensive healthcare • Long-term B2B contract with a stable project pipeline