At The Flex, we believe renting a home should be as simple as booking a ride.Our mission is to enable anyone to live anywhere, anytime, without friction.Powered by Base360.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.This isn't a role where you'll simply implement tickets.You'll identify problems, design solutions, build products, automate workflows, and help shape the future of the platform.What You'll DoBuild 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.Move Fast— Ship quickly, gather feedback, iterate, and continuously improve products based on real‑world usage.Create Automation— Design systems that eliminate manual work and allow the company to scale efficiently.Build Internal Tools— Develop operational dashboards, workflow engines, management platforms, and AI‑powered tools used across the nnect External Systems— Build integrations with platforms such as Airbnb, Stripe, Hostaway, Twilio, Google, and Open AI.Leverage AI— Implement AI‑powered features and workflows that improve productivity, decision‑making, and customer experience.Scale the Platform— Ensure systems remain reliable, secure,



and scalable as the business grows internationally.Tech StackPythonFast APIReactType ScriptSupabasePostgre SQLAWSOpen AI APIsStripeTwilioGit Hub ActionsYou don't need experience with every technology listed above, but you should be capable of learning quickly and adapting.What We're Looking ForMust-HaveStrong full‑stack development experienceExperience building production‑grade web applicationsStrong understanding of APIs and databasesProduct mindset and user‑centric thinkingAbility to work independently and take ownershipStrong problem‑solving skillsExcellent written communicationNice‑to‑HaveExperience with Fast APIExperience with React and Type ScriptExperience with AI tools or LLM integrationsStartup experienceProp Tech, marketplace, or Saa S experienceWhat Success Looks LikeWithin Your First YearYou've launched multiple high‑impact featuresManual operational processes have been automatedProduct development cycles are significantly fasterAI‑powered workflows have been deployed across the businessBase360.Ai has become a stronger competitive advantage for The FlexWhy Join The FlexMassive Ownership — You'll have direct influence over product decisions, architecture, and company strategy.Build Real Products — Your work will impact thousands of users and properties across multiple countries.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.High Growth Environment — We're building quickly and looking for people who want to grow alongside the company.This Role Is Not For You IfYou prefer highly structured corporate environmentsYou only want to write code from predefined specificationsYou avoid ownership outside your immediate responsibilitiesYou are uncomfortable moving quickly and adapting to changeIf you love building products, solving real‑world problems, and creating systems that scale, we'd love to hear from you.

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