At The Flex, we believe renting a home should be as simple as booking a ride. ai, our proprietary technology platform, we are building the operating system for modern renting—automating operations, connecting systems, and creating seamless experiences for guests, landlords, and operators worldwide. We're looking for a Full‐Stack Product Engineer who thrives at the intersection of product, engineering, and execution.

Build Products

End‐to‐End — Take ideas from concept to production by designing, building, testing, and launching features that create measurable business impact.

Own Customer

Problems — Work directly with founders and operational teams to understand challenges and transform them into elegant software solutions.

Connect External

Systems — Build integrations with platforms such as Airbnb, Stripe, Hostaway, Twilio,



Google, and OpenAI.

Python

FastAPI React TypeScript PostgreSQL AWS Stripe Twilio GitHub Actions Strong full‐stack development experience Experience building production‐grade web applications Strong understanding of APIs and databases Experience with FastAPI Experience with React and TypeScript ai has become a stronger competitive advantage for The Flex Why Join The Flex Learn at Startup Speed — You'll work closely with founders and gain exposure to engineering, product, operations, AI, and business. Remote‐First — Work from anywhere. You avoid ownership outside your immediate responsibilities

📌 Full-Stack Product Engineer (Madrid)
🏢 The Flex
📍 Madrid