Senior .NET Developer with React

Location: 100% remote work Salary: 130-142 PLN net/h (B2B via Experis)Responsibilities:• Design, develop, and deliver production-ready solutions from design through production.• Work across APIs, business logic, integrations, data access, and asynchronous processing.• Contribute to React and TypeScript frontend development when features require end-to-end ownership.• Collaborate within an established architecture and assess end-to-end impact across multiple application layers.• Build and operate HTTP APIs, integrations, and asynchronous or queue-based processing.• Contribute to technical decisions and design discussions.• Raise the quality bar through code reviews.• Support less experienced engineers.Requirements:Must Have:• Strong current .NET / C# backend experience in production enterprise systems.• Solid experience with SQL Server or another comparable relational database.• Experience building and operating HTTP APIs, integrations, and asynchronous or queue-based processing in production.• Working experience with Azure-hosted applications.• Ability to contribute across backend and React / TypeScript frontend when a feature requires end-to-end ownership.• Track record of owning features through delivery, production support, and code review.• Strong technical communication and ability to contribute to design discussions.Nice to Have:• Experience with MongoDB, Redis, SignalR, Ocelot, or comparable platform components.• Exposure to regulated, finance, tax, or compliance-heavy products.• Experience mentoring engineers or leading technical design within a squad.• Indirect tax, VAT, or broader tax technology exposure.Our offer:• MultiSport Plus• Group insurance• Medicover Premium