Senior Full Stack Software Engineer

The Flex; Paris; À distance; EUR 70 000 - 90 000; Plein temps

Résumé du poste

A modern rental solutions provider based in Paris is seeking a Senior Software Engineer to architect scalable systems for their platform. This role focuses on building impactful services, automating operations, and integrating with key partners. Ideal candidates will have 5+ years in software engineering, strong skills in Node.js and Python, and a passion for AI and automation. The company offers a competitive compensation package and a remote-first work environment.

Prestations

Competitive compensation

Meaningful equity upside

Remote-first environment

Qualifications

• 5+ years of experience in software engineering (backend or full stack).
• Strong skills in Node.js, Python (FastAPI), and AWS serverless architectures.
• Experience designing API-first systems and event-driven pipelines.
• Deep knowledge of distributed systems, databases, and high-scale automation.
• Curiosity for AI, property technology, and real-world operational systems.
• A bias for action — you build fast, think clearly, and deliver reliably.

Responsabilités

• Architect and deliver scalable services that power bookings and payments.
• Develop intelligent microservices and serverless workflows.
• Design systems capable of handling large volumes of transactions.
• Build and maintain integrations with key partners like Airbnb and Stripe.
• Work with AI engineers to apply predictive logic into core systems.
• Mentor teammates, drive engineering standards and code reviews.

Connaissances

Node.js

Python (FastAPI)

AWS serverless architectures

API-first systems

Distributed systems

Event-driven pipelines

Automation

Description du poste

Help build the future of global living.

At The Flex, we believe renting should be instant, intelligent, and effortless — as simple as tapping a button.

Our mission is ambitious: to make living anywhere in the world frictionless.

Powered by Base360.ai, our automation-first platform, we’re creating the operating system for modern rentals — unifying property data, streamlining operations, and powering intelligent systems behind every stay, in every city.

We’re searching for a Senior Software Engineer who loves designing scalable systems, solving complex problems, and building products with real-world impact.

If you’re motivated by architecture, automation, and global-scale engineering challenges, this is your opportunity to reshape how millions move and live.

What You’ll Build

You’ll engineer the foundations of The Flex platform — the services, APIs, and automation engines that keep our global rental network running smoothly.

From backend systems and data pipelines to cloud infrastructure and integration layers, your work will ensure our platform is fast, resilient, and intelligent.

You’ll partner with product, operations, and data to engineer clarity in an industry known for complexity — transforming messy real-world logistics into clean, automated workflows.

Your Mission

• Build the Backbone — Architect and deliver scalable services that power bookings, payments, availability, and end-to-end operations.
• Engineer Automation — Develop intelligent microservices and serverless workflows that eliminate manual processes across teams and cities.
• Scale Globally — Design systems capable of handling large volumes of transactions, events, and real-time updates with reliability.
• Connect the Ecosystem — Build and maintain integrations between Base360.ai and key partners like Airbnb, Stripe, Twilio, and Hostaway.
• Enhance Machine Intelligence — Work closely with AI engineers to apply predictive logic, automation, and adaptability into core systems.
• Lead Through Craft — Mentor teammates, drive engineering standards, and raise the technical bar with thoughtful code reviews and guidance.

You’re a Great Fit If You Have

• 5+ years of experience in software engineering (backend or full stack).
• Strong skills in Node.js, Python (FastAPI), and AWS serverless architectures.
• Experience designing API-first systems and event-driven pipelines.
• Deep knowledge of distributed systems, databases, and high-scale automation.
• Curiosity for AI, property technology, and real-world operational systems.
• A bias for action — you build fast, think clearly, and deliver reliably.

Why You’ll Love It Here

• Huge Real-World Impact — Your systems will automate the operations behind thousands of stays across multiple countries.
• A Global Mission, a Fast Team — Minimal bureaucracy, maximum autonomy, and a team of high-caliber builders.
• Ownership From Day One — You’ll own major parts of the stack and influence our architectural roadmap.
• Merit-Based Rewards — Competitive compensation and meaningful equity upside for exceptional contributors.
• Remote-First Environment — Work from anywhere. What counts is excellence, not hours logged.

This Role Is Not for You If

• You prefer slow, predictable environments.
• You need constant meetings instead of constant building.
• You’re happy shipping average code.
• You’re not aiming to become elite in your craft.

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