System Architect

At The Flex, we believe renting a home should be as effortless 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 fragmented systems, and creating seamless experiences for guests, landlords, and operators across the world. We're looking for a Full-Stack Engineering Lead to help scale both our technology and our engineering culture. This is a hands-on leadership role. You'll spend the majority of your time building products, solving technical challenges, and architecting systems while also helping guide engineering standards, mentoring team members, and shaping the future of the platform. If you're excited about ownership, rapid execution, AI, automation, and building products that have real-world impact, we'd love to meet you. WHAT YOU'LL BUILD As a Full-Stack Engineering Lead, you'll lead the development of Base360.ai, the technology platform powering every aspect of The Flex. You'll work across product, engineering, AI, and operations to create scalable systems that automate processes, improve decision-making, and accelerate company growth. You'll be responsible not only for what gets built, but how it's built. YOUR MISSION LEAD PRODUCT DEVELOPMENT Design, build, and launch high-impact products that improve guest experience, operational efficiency, and business performance. ARCHITECT SCALABLE SYSTEMS Make key technical decisions that ensure the platform remains scalable, reliable, and maintainable as the company grows internationally. DRIVE ENGINEERING EXCELLENCE Establish engineering best practices, code quality standards, development workflows, and technical documentation. MENTOR AND SUPPORT ENGINEERS Provide technical guidance, conduct code reviews, and help create a high-performance engineering culture focused on continuous improvement. BUILD AUTOMATION AT SCALE Develop systems that eliminate manual work and allow operations to scale efficiently across multiple markets. INTEGRATE CRITICAL PLATFORMS Build and maintain integrations with platforms including Airbnb, Hostaway, Stripe, Twilio, Google, OpenAI, and other strategic partners. LEVERAGE AI Implement AI-powered workflows, tools, and agents that improve productivity and decision-making across the business. COLLABORATE ACROSS TEAMS Work closely with product, operations, revenue, and leadership teams to translate business challenges into scalable technical solutions. TECH STACK Our current stack includes: * Python * FastAPI * React * TypeScript * Supabase * PostgreSQL * AWS * OpenAI APIs * Stripe * Twilio * Docker * GitHub Actions You don't need experience with every technology listed, but you should be comfortable learning quickly and leading technical decisions. WHAT WE'RE LOOKING FOR MUST HAVE * Strong full-stack software engineering experience * Experience designing and scaling production systems * Strong understanding of APIs, databases, cloud infrastructure, and system architecture * Experience leading technical projects from concept to deployment * Excellent problem-solving and communication skills * Ability to balance speed with engineering quality * Strong ownership mentality and bias toward execution BONUS POINTS * Experience leading engineers or technical teams * Startup or scale-up experience * Experience with AI products or LLM integrations * Experience with SaaS, marketplace, travel, or PropTech businesses * Experience with FastAPI, React, AWS, or Supabase WHAT SUCCESS LOOKS LIKE Within your first year: * Core systems become more scalable, reliable, and automated * Engineering velocity increases significantly * Technical debt is reduced without slowing innovation * AI-powered workflows are deployed across the business * New products are launched rapidly and effectively * Base360.ai becomes a major competitive advantage for The Flex WHY JOIN THE FLEX REAL OWNERSHIP You'll have direct influence over technology strategy, architecture, and product direction. BUILD AT SCALE Your work will power thousands of stays across multiple countries. LEAD BY BUILDING This is a hands-on role where you'll spend your time creating solutions, not sitting in meetings. SMALL TEAM, MASSIVE OPPORTUNITY Work closely with founders and help shape the future of both the platform and the engineering organization. PERFORMANCE-BASED REWARDS Competitive compensation with meaningful upside for exceptional performers. REMOTE-FIRST Work from anywhere. We care about impact, not hours worked. THIS ROLE IS NOT FOR YOU IF * You prefer large corporate environments with rigid processes * You enjoy managing more than building * You are uncomfortable making decisions with incomplete information * You require detailed instructions for every task * You are unwilling to take ownership beyond your immediate responsibilities If you're excited about leading by example, building world-class software, and helping create the operating system for modern renting, we'd love to hear from you. #LI-Remote

About Teads Teads is a leading omnichannel advertising platform focused on driving outcomes for brand and performance advertisers across screens. With a focus on meaningful business outcomes for branding and performance objectives, Teads drives value by leveraging predictive AI technology to connect quality media, beautiful brand creative, and context-driven addressability and measurement. Teads is directly partnered with more than 10,000 publishers and 20,000 advertisers globally. The company is headquartered in New York, New York with a global team of around 1,700 people in 30+ countries. For more information, visit www.teads.com. [https://www.teads.com] OUR MAIN ENGINEERING CHALLENGES AT TEADS * Build efficient and easy-to-use web products used by thousands of users working for the world’s most premium publishers, advertisers, and agencies. * Rich and diverse tech stack and system architecture to optimize for performance, scalability, resiliency, and cost efficiency. We use mostly Scala and TypeScript, among others. * Working in a very high-traffic environment (2.2 billion users per month, 100 billion events per day) with low latency and high availability constraints (2 million requests per second, responses in less than 150 milliseconds). * Management of large datasets with milliseconds order of magnitude access time, to compute in a near real-time complex auction resolution algorithm (18 million predictions per second). * A fast-changing environment where we continuously collaborate with Product teams and constantly adapt our Cloud infrastructure for new features and Products. * Bring a wide diversity of profiles to the same level of quality and knowledge * Work in an international environment with offices located in Israel, Slovenia and France. ABOUT THE OPPORTUNITY  We are looking for a Data Scientist to join a team of applied research. The AI department currently consists of 50 people who are a mix of data scientists, machine learning and backend engineers. The department provides technologies that power outcomes of campaigns with a total yearly turn over of $1.7B.  Runs large scale prediction and control systems for ad delivery, dealing with millions of live ads, doing more than a billion predictions per second based on large on-line trained models being updated every 5 minutes. WHAT WILL YOU DO? As a Data Scientist, your mission will be to: * Innovate at Scale: Stay at the forefront of AdTech research, focusing on CTR prediction, online learning regimes, and high-dimensional embeddings. * Bridge Research & Engineering: Collaborate with cross-functional teams to identify research gaps and translate them into production-ready features. * Own the Lifecycle: Lead the end-to-end process—from reading the latest ArXiv papers to A/B testing and monitoring model performance in a live environment. * Experiment Freely: Dedicate time to "deep-work" sessions, testing unconventional hypotheses and new algorithmic approaches. WHAT WILL YOU BRING TO THE TEAM? * The Foundation: An advanced degree (MSc/PhD) in a quantitative field or equivalent "in-the-trenches" industry experience. * The Toolkit: 4–5 years of experience in applied research, specifically deploying ML algorithms into high-throughput online environments. * The Hybrid Edge: Strong software engineering fundamentals; you don’t just design models, you understand how they fit into the code stack. * Critical Thinking: The ability to dismantle a scientific paper, critique its methodology, and implement its core findings effectively. * Communication: A knack for making the complex simple. You can explain a transformer-based ranking system to a peer or a product manager with equal clarity. Please submit your CV in English. WE CARE ABOUT YOU  * Career Development: Continuous investment in our employees’ skills: in-house and external training, internal mobility … * Life Balance: A well-balanced work-life for our employees is one of our top priorities: 22 days off per year, hybrid work (3 days per week in the office) * Wellness: Prioritizing employee well-being through premium work equipment, enjoyable work environment (work-life balance, team building events, summits), remote work subsidy, promoting Diversity & Inclusion with internal & external initiatives, etc.  #LI-Hybrid Life at Teads At Teads, we don’t just offer new roles - we blend creativity, technology, and data to shape the future of media. You’ll work with smart humans, meaningful brands, and cool tools, all while helping redefine how advertising works in a world that demands more transparency, better insights, and smarter strategies. As a Teadster, you’ll play a critical role in shaping our future success in the region. Here’s why Teads stands out: * We've merged two open internet category leaders—Outbrain and Teads—to create the ‘new’ Teads, a unified omnichannel platform that drives results from branding to performance across all screens, including CTV, mobile, and web. * As part of our team, you’ll thrive in a collaborative and forward-thinking environment that fosters innovation, creative problem-solving, and continuous learning. * Teads is committed to your success, offering the support, tools, and development opportunities you need to excel in your role. Our company culture is welcoming, dynamic, diverse, global, and built on top performance. Teads is an equal employment opportunity employer and committed to diversity and inclusion at all stages of recruitment and employment. Our team is made up of individuals who are approachable, resourceful, passionate, and proactive. We foster a sense of belonging through our Employee Resource Groups – employee-led groups in which we debate topics and drive change: environmental, women empowerment, charitable initiatives to diversity, equity, and inclusion, you’ll be able to share your passions with likeminded people.