Senior Software Engineer (.NET/C#/Azure)

This position is listed on behalf of a partner company, which manages all applications and next steps. Our partner is looking for a Senior Software Engineer (.NET/C#/Azure) based in the United States. We are seeking an experienced Senior Software Engineer to help modernize a large-scale digital auction platform for a wholesale marketplace. In this fully remote contract role, you will build a new, independent backend designed to replace legacy auction management capabilities and support a digital-first experience. You will contribute to core platform features spanning inventory management, financial transactions, and customer management. Working across multiple teams, you will translate business requirements into scalable, maintainable solutions using C#, .NET Core, Microsoft Azure, and Azure DevOps. The role combines hands-on software development with technical collaboration, architectural best practices, and continuous delivery. This is an opportunity to make a meaningful impact on a complex modernization initiative while working in an agile, technology-driven environment that embraces AI-assisted development.