This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Arquiteto de Software (.NET) based in Brazil. This is a senior technical leadership opportunity supporting the modernization of a mission-critical technology platform within the banking sector. You will own and evolve the architecture behind foundational capabilities spanning infrastructure, data, and observability. The role combines strategic architecture with hands-on engineering, giving you direct influence over technology choices, technical standards, and delivery quality. You will work with distributed systems, cloud-native technologies, microservices, and high-volume transactional workloads. Collaboration with engineering squads and business stakeholders will be essential to translating complex requirements into scalable and resilient solutions. This is an environment where architectural thinking, technical depth, innovation, and continuous improvement are highly valued.