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Backend Developer

The Flex
Department:Backend Developer
Type:REMOTE
Region:EU
Location:Slovakia
Experience:Mid-Senior level
Estimated Salary:€45,000 - €70,000
Skills:
NODE.JSPYTHONFASTAPIAWSSERVERLESSAPIDATABASESSYNCHRONIZATIONDISTRIBUTED SYSTEMSAUTOMATIONPROPTECHMICROSERVICESEVENT-DRIVEN SYSTEMSDATA PIPELINESAI
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Job Description

Posted on: November 14, 2025

Rebuild the backbone of modern renting. At The Flex, we believe renting a home should be instant, intelligent, and seamless — as easy as tapping a button. Our ambition is bold: create a world where anyone can live anywhere without friction. Powered by Base360.ai, our automation and intelligence platform, we’re building the operating system for global stays — syncing property data, orchestrating operations, and powering the infrastructure behind every effortless guest experience. We’re hiring a Backend Engineer who loves building automation, scaling systems, and solving real-world problems with clean, resilient software. 💡 What You’ll Build As a Backend Engineer, you’ll architect the foundations of The Flex: the systems, APIs, and automation layers that coordinate global inventory, sync bookings in real time, and enable properties to operate autonomously. Your work will blend digital automation with real-world logistics — enabling thousands of stays to run smoothly without manual intervention. ⚙️ Your Mission Build the Core — Design and scale robust APIs and backend services that manage bookings, payments, availability, and property intelligence. Automate the Workflows — Develop serverless functions and microservices that eliminate repetitive tasks and streamline operations across cities and continents. Connect the Ecosystem — Implement integrations between Base360.ai and major platforms such as Airbnb, Stripe, Twilio, and Hostaway. Engineer for Scale — Architect event-driven systems and data pipelines capable of handling millions of events and transactions reliably. Power Intelligence — Work with AI and data teams to embed smart automation and predictive logic into operational flows. Collaborate Closely — Partner with product, front-end, and operations teams to translate messy real-world challenges into simple, scalable backend solutions. 🧠 You’ll Excel in This Role If You Have

  • Expertise with Node.js, Python/FastAPI, and AWS serverless.
  • Strong experience building and scaling API-first products.
  • A deep understanding of databases, synchronization logic, and distributed systems.
  • A passion for automation, intelligent operations, and emerging PropTech.
  • A systems-level mindset — you think in terms of resilience, reliability, and flow.
  • A strong bias toward execution and ownership.

🌍 Why You’ll Love Working Here Meaningful Impact — Your systems will become the automation engine of thousands of stays across multiple countries. High Ownership — Small team, no bureaucracy, and the opportunity to influence core architectural decisions. Speed & Autonomy — Move fast, ship often, and help define the future of our technical ecosystem. Performance-Based Rewards — Competitive salary + meaningful equity opportunities for top performers. Fully Remote — Work from anywhere. What matters is excellence, not timesheets. 🚫 This Role Is Not for You If

  • You want slow, predictable routines.
  • You prefer planning meetings over shipping code.
  • You’re content writing average software.
  • You’re not committed to becoming world-class in your craft.
Originally posted on LinkedIn

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