Senior Backend & AI Integration Engineer

Senior software engineer and independent consultant with over 15 years of experience, specializing in backend development using Python (Django, FastAPI, Flask) and PHP (Laravel, Drupal). Expertise includes API development, data pipeline work, and AI integration features (RAG, LangChain, LangGraph, vector DBs). Possesses strong infrastructure and operations skills (Docker, CI/CD, Kubernetes, Linux) and is comfortable owning projects end-to-end and mentoring. Based in Valencia, Spain (CET), seeking remote-only work with a reliable 4-hour daily overlap with US business hours. Handles invoicing and tax administration. Holds work authorization in US (SS/EIN) and Spain (NIE). Spanish availability is limited due to DNV limitations of no more than 20% revenue sourced from Spanish companies.