Senior Full-Stack Developer Needed to Build AI Vehicle Search & Alert Platform (Web + Mobile)

I am looking for an experienced Senior Full-Stack Developer to build a modern SaaS platform for monitoring vehicle listings across multiple online sources. Users will be able to create custom searches, receive real-time notifications, manage saved searches, analyze listings with AI, and subscribe to premium plans. The platform includes: User authentication Subscription billing Dashboard Vehicle search filters Real-time notifications AI analysis Mobile applications Admin panel Looking for someone with experience building scalable SaaS platforms using React, Next.js, FastAPI, PostgreSQL, AWS, Docker and modern cloud architecture.