This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Software Architect (.Net+React) based in Brazil. We are looking for an experienced Software Architect to help design and evolve scalable, secure, and high-performing web applications. You will work across backend and frontend technologies, with a strong focus on .NET Core, JavaScript, and React. The role combines hands-on architecture, software engineering, security, performance optimization, and technical leadership. You will also leverage AI tools and agentic development practices to improve code quality, accelerate delivery, and modernize engineering workflows. The environment is collaborative and highly focused on continuous learning, innovation, and technological adaptability. This is an opportunity to influence architectural decisions while mentoring developers and contributing to solutions with meaningful business impact.