This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Sr. Software Engineer (C# .NET) based in United States . This is an opportunity to build and evolve high-value, cloud-native software components that support a large-scale digital marketplace.You’ll work primarily with .NET Core to design scalable APIs and contribute to reliable, high-performance applications.The role combines hands-on engineering with technical leadership, architecture discussions, testing, and continuous improvement.You’ll collaborate with cross-functional teams while helping shape core technology used across critical business capabilities.The environment emphasizes engineering quality, observability, performance, knowledge sharing, and modern cloud practices.You’ll have opportunities to work with AWS, Kubernetes, OpenTelemetry, PostgreSQL, and other contemporary technologies.This role is ideal for a technically strong engineer who enjoys solving complex problems, mentoring peers, and continuously improving how software is built.