Full Stack AI Engineer

Factor Law is hiring a Full Stack AI Engineer to build production-grade AI products for complex legal workflows. This hands-on role spans backend and frontend delivery, from document ingestion to user experience, and from prototype to production. You will develop production services using Python, FastAPI and Pydantic models, create APIs and backend workflows for AI-enabled document and contract intelligence, and work with PostgreSQL, SQLAlchemy and Alembic. You’ll build and maintain asynchronous job systems with Redis for caching and coordination, create React and TypeScript interfaces, and leverage TanStack Query for server state. The role includes supporting document-heavy workflows, ensuring enterprise security (authentication, authorization, secure data handling, auditability), and operating within Azure environments. You’ll instrument production systems with observability tooling, use AI coding tools to accelerate implementation while maintaining code quality, and move fluidly between infrastructure and product delivery. The position requires the ability to work in a high-autonomy product and engineering environment, shipping production software and demonstrating ownership across edge cases, tests, and user impact. The company emphasizes a diverse, inclusive culture and operates across Europe and North America with a focus on legal-tech delivery.