Senior Python Backend Engineer, Financial Systems

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Python Backend Engineer, Financial Systems based in Brazil. This is a fully remote engineering role focused on building the financial infrastructure behind a modern, AI-powered SaaS platform.You will work on production-grade Python services, financial workflows, APIs, integrations, and multi-tenant systems where reliability and data accuracy are critical.The role combines backend engineering with hands-on development of AI agents, orchestration services, and MCP servers.You will help build systems for payments, billing, payouts, commissions, refunds, reconciliation, and settlement processes.You will also contribute to scalable rules engines and configuration systems that allow customers to launch new products without extensive custom development.The environment is highly autonomous, technically ambitious, and deeply focused on AI-assisted engineering and developer productivity.This is a long-term independent contractor opportunity for candidates located in Brazil or Argentina, with English required for the application.