Comprehensive pytest skill for async Python testing with proper mocking, fixtures, and patterns from production-ready test suites. Use when writing or improving async tests for Python applications, especially FastAPI backends with database interactions.
Implement Brazilian financial system integrations including Boleto generation, PIX payments, parcelamento (installments), CPF/CNPJ validation, and Banco do Brasil API integration. Use this skill when building fintech applications, payment processing systems, or any system requiring Brazilian banking compliance.
Build FastAPI applications using Clean Architecture principles with proper layer separation (Domain, Infrastructure, API), dependency injection, repository pattern, and comprehensive testing. Use this skill when designing or implementing Python backend services that require maintainability, testability, and scalability.
Implement enterprise Single Sign-On (SSO) authentication supporting multiple identity providers with JWT RS256 tokens, backwards verification, session management, and cross-system permission mapping. Use this skill when building authentication systems that integrate with multiple enterprise SSO providers or when implementing secure token validation with session verification.