This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Staff Backend Engineer based in Brazil. This is a high-impact backend engineering role focused on building the core systems behind an AI-native financial platform.You will design and ship reliable backend services and APIs that power business-critical accounting workflows.The role combines technical depth with end-to-end ownership across architecture, development, deployment, and observability.You’ll work extensively with complex business logic, financial data, integrations, and production systems where correctness and reliability matter.As a senior technical contributor, you’ll have significant influence over engineering decisions and product direction.You’ll join a fast-moving, high-trust environment where pragmatic solutions, initiative, and rapid iteration are highly valued.The position offers substantial ownership and the opportunity to help shape foundational technology at an early-stage, high-growth company.