Remote (Brazil, Argentina) - Experienced Full-stack (React & Python) Contractor

Senior-level experience building SaaS applications end-to-end Strong proficiency in React Strong proficiency in Python Experience with API design and integration Experience with databases Experience with data pipelines Ability to work from clear PRDs, prototypes, and defined data models Comfortable using AI coding tools (Claude Code, Copilot, Cursor, ChatGPT) daily Able to direct AI with clear prompting, refine its output, and detect correctness/security issues Value AI as a productivity multiplier, not a crutch Fluent or professional level English communication Clear, organized, and assertive communication Ability to work a minimum of 4 hours overlapping with the US Eastern timezone Eager to learn, grow, and have fun

Build a production system based on an existing React prototype Implement interactive data visualizations Implement risk scoring and analysis logic Implement backend integrations and supporting pipelines Collaborate on evolving data models Build frontend interfaces for an automated Security Operations (SOC) platform Integrate with backend services Support systems designed for heavy background data processing Direct, review, and refine AI-generated implementations Critically evaluate AI output for correctness, edge cases, and maintainability