This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior .NET Legacy Modernisation based in Brazil. This role offers the opportunity to contribute to a large-scale enterprise application modernisation programme in a complex legacy environment.You will design, enhance, maintain, and modernise business-critical applications across established and modern .NET technologies.The position combines hands-on development with application analysis, systems integration, troubleshooting, and technical decision-making.You will work extensively with C#, .NET Framework, WinForms, WebForms, REST APIs, SOAP, and XML.The role is particularly suited to an engineer who enjoys understanding complex codebases and progressively evolving them into maintainable solutions.You will collaborate with developers, consultants, and technical specialists within an Agile, international engineering environment.It is an opportunity to take ownership of challenging technical work while contributing to a broader digital transformation programme.