TF
Founding Engineer
full-time•Paris
About this role
Join the team redefining the future of global living — from the ground up.
At The Flex, we believe renting a home should feel instant, intelligent, and effortless — as seamless as booking a ride.
Our ambition is bold: enabling anyone to live anywhere, anytime, without friction.
Powered by Base360.ai, our proprietary automation engine, we’re building the operating system for modern renting — connecting property data, orchestrating operations, and enabling seamless stays across continents.
This is not a job where you “pick up tickets.”
This is a chance to build a company’s technical foundation and define how a global platform operates at scale.
💡 What You’ll Build
As a Founding Engineer, you will help design, build, and scale the core technology that The Flex is built on — from first principles.
You’ll work across product, engineering, and operations, owning systems end-to-end: web apps, APIs, automation pipelines, integrations, and cloud infrastructure.
You’ll make architectural decisions early — the kind that matter for years — and move fast to turn ideas into production systems used in the real world.
If you enjoy ambiguity, ownership, and building things that actually ship, this role is for you.
⚙️ Your Mission
Build from Zero to One
Design and implement the initial architecture powering bookings, payments, availability, and guest experience.
Own the Stack
Build across frontend, backend, APIs, and cloud infrastructure — choosing tools and patterns that scale.
Automate the Business
Replace manual processes with event-driven workflows and intelligent automation from day one.
Integrate the Ecosystem
Build deep integrations with platforms such as Airbnb, Stripe, Hostaway, and Twilio.
Ship Relentlessly
Deploy, monitor, and iterate on production systems with speed, reliability, and pragmatism.
Solve Real-World Problems
Tackle real-time booking sync, pricing intelligence, keyless access logic, AI-powered alerts, and operational dashboards.
Set the Technical DNA
Establish engineering standards, best practices, and a culture of quality, ownership, and execution.
🧠 You’re a Great Fit If You Have
Strong experience building production systems (full-stack or backend-heavy)
Comfort working across web apps, APIs, and cloud infrastructure
Experience with Node.js, React, and AWS (or equivalent stacks)
Familiarity with Python / FastAPI for automation or data services (bonus)
A bias toward shipping over perfection
High tolerance for ambiguity and changing requirements
An ownership mindset — you treat the product like it’s yours
🌍 Why You’ll Love Working Here
Foundational Impact
Your work will define how the company operates for years to come.
Extreme Ownership
You won’t just influence decisions — you’ll make them.
Fast Feedback Loop
What you build goes live, gets used, and evolves quickly.
Meaningful Upside
Competitive compensation with strong upside aligned to long-term success.
Remote-First
Work from anywhere — autonomy and trust are core to how we operate.
🚫 This Role Is Not for You If
You want well-defined requirements and rigid processes
You avoid responsibility for production systems
You prefer specialization over ownership
You’re optimizing for comfort instead of impact
#LI-Remote
What you'll do
- As a Founding Engineer, the role involves designing, building, and scaling the core technology from first principles, owning systems end-to-end across product, engineering, and operations. Responsibilities include building initial architecture for bookings and payments, owning the full stack, automating business processes, and integrating external platforms.
About The Flex
At Flex Living, we believe renting a home should be as easy as buying an item from Amazon, that means ensuring our guests have an abundance of choice and flexibility to cancel if their plans change. We aim to help landlords stop paying excessive management fees and help renters live and work comfortably anywhere in the world.
Ready to join The Flex?
Take the next step in your career journey
Frequently Asked Questions
What does a Founding Engineer do at The Flex?
As a Founding Engineer at The Flex, you will: as a Founding Engineer, the role involves designing, building, and scaling the core technology from first principles, owning systems end-to-end across product, engineering, and operations. Responsibilities include building initial architecture for bookings and payments, owning the full stack, automating business processes, and integrating external platforms..
Is the Founding Engineer position at The Flex remote?
The Founding Engineer position at The Flex is based in Paris, Ile-de-France, France. Contact the company through Clera for specific work arrangement details.
How do I apply for the Founding Engineer position at The Flex?
You can apply for the Founding Engineer position at The Flexdirectly through Clera. Click the "Apply Now" button above to start your application. Clera's AI-powered platform will help match your profile with this opportunity and guide you through the application process.