Senior .NET Legacy Modernisation

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.

Accountabilities

• Enterprise Application Development: Design, develop, enhance, and maintain enterprise-grade .NET applications supporting critical business operations.
• Legacy Modernisation: Work across legacy and hybrid application environments, helping evolve established systems into maintainable and sustainable .NET solutions.
• .NET Development: Build and maintain applications using C#, .NET Framework, WinForms, and WebForms, working effectively across both established and modern codebases.
• Systems Integration: Develop and maintain integrations using REST APIs, SOAP web services, and XML, ensuring reliable communication between enterprise applications and services.
• Legacy Analysis: Analyze existing applications, dependencies, integrations, and business logic to understand how systems operate and identify opportunities for modernization.
• Troubleshooting: Investigate and resolve complex technical issues across both legacy and modernized applications, minimizing disruption to business-critical services.
• Mixed Technology Environments: Work confidently within codebases containing combinations of C#, VB.NET, and other legacy technologies.
• Technical Collaboration: Partner with consultants, developers, and other technical specialists to deliver solutions within the wider modernization programme.
• Engineering Standards: Contribute to technical decisions, development standards, coding practices, and maintainable engineering approaches.
• Agile Delivery: Participate actively in an Agile, cross-functional team, taking ownership of technical tasks and contributing to continuous improvement.

Requirements

• Senior .NET Experience: Strong commercial experience as a Senior .NET Developer working with enterprise-grade or business-critical applications.
• C# & .NET: Deep hands-on expertise with C# and .NET Framework.
• Desktop & Web Technologies: Strong practical experience with WinForms and/or WebForms.
• Integration Technologies: Proven production experience consuming and integrating REST APIs, SOAP web services, and XML.
• Legacy Environments: Strong understanding of established and complex codebases, with the ability to navigate legacy systems, dependencies, and business logic.
• Modernisation Experience: Experience maintaining, enhancing, migrating, or modernising established enterprise applications.
• Problem Solving: Excellent debugging, troubleshooting, analytical, and problem-solving abilities.
• Ownership: Ability to work independently, take responsibility for complex technical tasks, and drive issues through to resolution.
• Agile Experience: Previous experience working within Agile and cross-functional software development teams.
• Communication: Strong written and verbal English communication skills.
• Remote Collaboration: Comfortable working remotely as part of an international engineering team.

Nice to have:

• Commercial experience with VB.NET, particularly in applications combining VB.NET and C#.
• Previous involvement in application modernisation or legacy transformation programmes.
• Experience working in complex, regulated, or large-scale enterprise environments.
• Knowledge of CA Gen / Cool.
• Experience with applications or components generated by, integrated with, or being migrated away from CA Gen.
• Broader exposure to legacy enterprise or mainframe environments.

Benefits

• Remote work from Brazil or Portugal.
• Collaborative environment where responsibility and authority are shared across the team.
• Culture focused on learning from challenges and mistakes rather than assigning blame.
• Agile working environment where team members are encouraged to contribute ideas.
• Opportunities to work on different projects and broaden technical experience.
• Ongoing training and mentoring.
• Opportunities for professional and technical growth.
• Potential opportunities for business travel and international project exposure.

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