At The Flex, we believe renting a home should feel as effortless as booking a ride.
ai , our proprietary automation platform, we are building the operating system for modern renting—connecting property data, orchestrating operations, automating workflows, and enabling seamless stays across continents.
What You'll Build As a Founding Software Engineer, you'll help architect and scale Base360.ai—the technology platform powering every aspect of The Flex.
Integrate the Ecosystem Build and maintain integrations with platforms including Airbnb, Hostaway, Stripe, Twilio, OpenAI, Google, and other strategic partners.
Scale Infrastructure Deploy and manage cloud-native infrastructure designed for reliability, performance, and general growth.
Move Fast Own projects end-to-end—from idea to deployment—and continuously improve the systems you build.
Python
FastAPI




React
TypeScript
PostgreSQL
AWS
Serverless Architecture
Twilio
Stripe
Docker
GitHub Actions
Strong experience building production-grade software systems
Experience with FastAPI, Python, React, or similar frameworks
Strong understanding of APIs, distributed systems, and cloud architecture
Experience designing scalable backend systems
AWS serverless infrastructure
ai becomes a competitive advantage that enables rapid global scaling
Why Join The Flex Build Something Meaningful
You'll solve real-world challenges across software, AI, automation, operations, and scale.
Performance-Based Rewards
Remote-First

📌 Software-ontwikkelaar (Madrid)
🏢 The Flex
📍 Madrid