Sr. Software Engineer (Backend)

About IXOPAY IXOPAY is the enterprise-grade global payment infrastructure platform built for the era of agentic commerce. We equip merchants and enterprises with AI-driven intelligence, payment orchestration, advanced tokenization, and the tools to optimize every stage of the payments journey. From intelligent routing and compliance to customizable modules and enterprise-scale orchestration, IXOPAY helps businesses integrate faster, improve payment performance, and expand globally with confidence. At IXOPAY , our people are our greatest strength. Our collaborative culture is built on shared values that guide how we work, innovate, and support our customers. About the Role We're looking for a Senior Software Engineer to join our Engineering team and help build the backend foundation of IXOPAY 's next-generation, AI-first payment orchestration platform. In this hands-on role, you'll design and build the services that power intelligent payment routing, connector management, token intelligence, and platform configuration. You'll work on complex, high-scale systems that enable merchants to optimize payment performance while building secure, extensible infrastructure for the future of payments. You'll collaborate closely with Product, AI, and Engineering teams, mentor junior engineers, and play a key role in shaping the architecture of a platform used by global enterprise customers. What You'll Do Design, build, and maintain scalable backend services using C# and .NET. Develop the core infrastructure that powers payment routing, connector management, and platform configuration. Design secure, extensible APIs that support both customer-facing applications and AI-powered workflows. Build reliable, observable services that process high-volume payment transactions with performance and resilience in mind. Collaborate with Product and AI teams to translate business requirements into scalable technical solutions. Contribute to platform architecture, engineering standards, and te