Founding Software Engineer

At The Flex, we believe renting a home should be as effortless as booking a ride.Our mission is ambitious: 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 fragmented systems, and creating seamless experiences for guests, landlords, and operators across the world.We’re looking for a Founding Software Engineer to help architect and build the technology that powers the future of The Flex.This is not a typical engineering role.You’ll work directly with the founder, influence product strategy, make architectural decisions, and build systems that become the foundation of a global business.You’ll have extraordinary ownership, responsibility, and impact from day one.What You’ll BuildAs a Founding Software Engineer, you’ll help create and scale Base360.ai-the technology platform that powers every aspect of The Flex.From AI-powered workflows and booking systems to operational automation and intelligent decision-making, you’ll build products that directly impact revenue, efficiency, and customer experience.You won’t just ship features.You’ll create systems that replace manual work, unlock scale, and become a competitive advantage for the company.Your MissionBuild Core ProductsDesign, build, and launch the software that powers bookings, pricing, payments, operations, communications, and guest experiences.Architect the PlatformMake key technical decisions and help define the long-term architecture of Base360.ai.Create Automation at ScaleDevelop workflows and systems that automate operational processes across multiple countries and thousands of stays.Leverage AIBuild AI-powered tools, agents, and workflows that improve productivity, decision-making, and customer experience.Integrate the EcosystemDevelop and maintain integrations with platforms including Airbnb, Hostaway, Stripe, Twilio, Google, OpenAI, and other strategic partners.Move FastOperate with urgency and ownership, turning ideas into production-ready solutions quickly and effectively.Solve Real ProblemsWork On Challenges Such AsReservation synchronizationDynamic pricingSmart access managementGuest communication automationOperational forecastingMaintenance and cleaning automationAI-powered alerts and monitoringRevenue optimizationHelp Build the CompanyAs one of the first engineers, your influence will extend beyond code. You’ll help shape processes, culture, product direction, and the future engineering team.Tech StackOur Current Stack IncludesPythonFastAPIReactTypeScriptSupabasePostgreSQLAWSOpenAI APIsStripeTwilioDockerGitHub ActionsWe care more about your ability to learn and build than your experience with any specific technology.What We’re Looking ForMust HaveStrong software engineering fundamentalsExperience building production-grade applicationsStrong understanding of APIs, databases, and system designProduct mindset and customer obsessionAbility to work independently with minimal supervisionStrong problem-solving abilityHigh level of ownership and accountabilityBonus PointsStartup experienceExperience with AI products or LLM integrationsExperience building SaaS productsExperience with FastAPI, React, AWS, or SupabaseMarketplace, travel, or PropTech experienceWhat Success Looks LikeWithin Your First YearCritical company operations are automated through systems you’ve builtBase360.ai becomes a core competitive advantageNew products are shipped rapidly and reliablyEngineering velocity increases significantlyAI-powered workflows are embedded across the businessThe platform is ready to scale internationallyWhy Join The FlexMassive ImpactYour work will directly shape how thousands of people live, travel, and experience cities.Founding-Level OwnershipYou’ll have significant influence over product, technology, and company direction.Build Alongside the FounderWork closely with leadership and help define the future of the business.Learn FasterGain exposure to engineering, AI, product, operations, growth, and company-building.Performance-Based RewardsCompetitive compensation with meaningful upside for exceptional contributors.Remote-FirstWork from anywhere. We care about results, not hours.This Role Is Not For You IfYou’re looking for a predictable corporate environmentYou prefer maintaining systems rather than building themYou need constant direction and supervisionYou avoid ownership outside your immediate responsibilitiesYou are uncomfortable with change, ambiguity, and rapid executionIf you’re excited by building products, solving hard problems, leveraging AI, and helping create the operating system for modern renting, we’d love to hear from you.#J-*****-Ljbffr

We care more about your ability to learn and build than your experience with any specific technology. What We’re Looking For Must Have Strong software engineering fundamentals Experience building production-grade applications Strong understanding of APIs, databases, and system design Product mindset and customer obsession Ability to work independently with minimal supervision Strong problem-solving ability High level of ownership and accountability Bonus Points Startup experience Experience with AI products or LLM integrations Experience building SaaS products Experience with FastAPI, React, AWS, or Supabase Marketplace, travel, or PropTech experience

Within Your First Year Critical company operations are automated through systems you’ve built Base360.ai becomes a core competitive advantage New products are shipped rapidly and reliably Engineering velocity increases significantly AI-powered workflows are embedded across the business The platform is ready to scale internationally Why Join The Flex Massive Impact Your work will directly shape how thousands of people live, travel, and experience cities. Founding-Level Ownership You’ll have significant influence over product, technology, and company direction. Build Alongside the Founder Work closely with leadership and help define the future of the business. Learn Faster Gain exposure to engineering, AI, product, operations, growth, and company-building. Performance-Based Rewards Competitive compensation with meaningful upside for exceptional contributors. Remote-First Work from anywhere. We care about results, not hours. This Role Is Not For You If You’re looking for a predictable corporate environment You prefer maintaining systems rather than building them You need constant direction and supervision You avoid ownership outside your immediate responsibilities You are uncomfortable with change, ambiguity, and rapid execution If you’re excited by building products, solving hard problems, leveraging AI, and helping create the operating system for modern renting, we’d love to hear from you. #J-*****-Ljbffr

Badajoz, España

At The Flex, we believe renting a home should be as effortless as booking a ride. Our mission is ambitious: 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 fragmented systems, and creating seamless experiences for guests, landlords, and operators across the world. We’re looking for a Founding Software Engineer to help architect and build the technology that powers the future of The Flex. This is not a typical engineering role. You’ll work directly with the founder, influence product strategy, make architectural decisions, and build systems that become the foundation of a global business. You’ll have extraordinary ownership, responsibility, and impact from day one. What You’ll Build