Senior Back-end Engineer (C#/.NET) - Software

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Back-end Engineer (C#/.NET) - Software based in Brazil. This is an opportunity for a senior backend engineer to build and scale enterprise-grade SaaS applications within a modern, AI-assisted engineering environment. You will solve complex business problems and translate them into clean, modular, and maintainable backend solutions. The role combines hands-on development with architectural ownership across APIs, microservices, databases, and distributed systems. You will work with C#, .NET, SQL Server, and modern engineering patterns including DDD and CQRS. You will also take responsibility for testing and quality throughout the development lifecycle, following a Shift Left approach. Working closely with product and engineering teams, you will help deliver reliable, customer-focused capabilities for a sophisticated cloud platform.