> Markdown version of [/jobs/ext/2776913-cto-co-founder-proptech](https://www.wearedevelopers.com/jobs/ext/2776913-cto-co-founder-proptech). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Cto & Co-Founder - Proptech - **Company:** Antai Ventures - **Location:** Laza, Spain - **Contract:** Permanent contract - **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, Continuous Delivery, Large Language Models, Multi-Agent Systems - **Published:** September 7, 2026 - **Apply:** https://www.buscojobs.com.es/cto-co-founder-proptech-en-laza-ID-369821675 ## About the Role Proven track record as a hands-on engineer, tech lead, or CTO in an early-stage environment. Hands-on builder. You prototype fast and turn ideas into working features in days, not weeks. Practical AI experience. You have built production systems with LLMs - agent orchestration, multi-agent workflows, conversational AI - and know what actually works outside a demo. Architectural thinking. You design systems that are simple enough to ship fast today and solid enough to scale tomorrow. Ownership mindset. You take responsibility for outcomes and think long-term about product and company value. Clear communicator. You can explain technical trade-offs to engineers and non-technical co-founders alike. Fluency in Spanish and English. ## Description ? About Antai VenturesAntai Ventures is a Barcelona-based venture studio with presence across Southern Europe and LatAm. We partner-up and invest in the best co-founders to build global companies willing to disrupt multi-billion dollar industries. Since **** we have co-founded +30 companies includingGlovo, Wallapop, PlatanoMelon,andPiper. Our ventures have raised more than$1.5Bin funding, have generated more than$3Bin shareholders value and currently employ more than****people.?About the ventureWe are building an AI-native platform for the real estate sector in Spain - one of the most fragmented, relationship-driven, and underdigitised industries in Southern Europe.We have a validated product thesis, a clear go-to-market, and we're now looking for a co-founder & CTO to build it.? What you'll doBuild, launch and scale a disruptive product from scratch.Own the technical architecture - define the stack, set the engineering standards, and make the hard trade-offs between speed and scalability from day one.Design and implement a multi-agent orchestration layer - persistent state management, agent-to-agent handoffs, tool-calling pipelines, and context windows that don't collapse under real usage.Build and maintain LLM-powered workflows in production.Integrate third-party infrastructure (voice providers, CRMs, payment and signing APIs, document verification) into a coherent, maintainable system.Ship code daily - from prototype to production, you are hands-on throughout.Drive a culture of excellence through continuous delivery, rapid experimentation, and customer-obsessed iteration.? What We're Looking ForProven track recordas a hands-on engineer, tech lead, or CTO in an early-stage environment.Hands-on builder.You prototype fast and turn ideas into working features in days, not weeks.Practical AI experience.You have built production systems with LLMs - agent orchestration, multi-agent workflows, conversational AI - and know what actually works outside a demo.Architectural thinking.You design systems that are simple enough to ship fast today and solid enough to scale tomorrow.Ownership mindset.You take responsibility for outcomes and think long-term about product and company value.Clear communicator.You can explain technical trade-offs to engineers and non-technical co-founders alike.Fluency in Spanish and English.? What We OfferDay-1 founding seat. Join an ambitious venture from the ground up, with a validated concept and Antai's full backing.Significant equity. Own a meaningful stake in the venture, plus optional carry in other Antai portfolio companies.Full-stack operator support. Access Antai's expert teams in Product, Engineering, Design, GTM, Legal, Talent, and Fundraising whenever you need them.Founder community and investors. Join a tight network of serial entrepreneurs and top-tier backers who have scaled category leaders.Based in Barcelona, hybrid. ## Related Videos - [Bringing the power of AI to your application.](https://www.wearedevelopers.com/videos/1010-bringing-the-power-of-ai-to-your-application) - [From DevOps to Scaled DevOps: How We’re Rebuilding Continuous Delivery as a Platform](https://www.wearedevelopers.com/videos/100018-from-devops-to-scaled-devops-how-we-re-rebuilding-continuous-delivery-as-a-platform) - [Designing and Deploying Distributed Multimodal Multi-Agent Systems with Google's AI Stac](https://www.wearedevelopers.com/videos/1976-designing-and-deploying-distributed-multimodal-multi-agent-systems-with-google-s-ai-stac) - [Creating Industry ready solutions with LLM Models](https://www.wearedevelopers.com/videos/899-creating-industry-ready-solutions-with-llm-models) - [Agentic employees in world's most downloaded FinTech app](https://www.wearedevelopers.com/videos/100123-agentic-employees-in-world-s-most-downloaded-fintech-app) - [Implementing continuous delivery in a data processing pipeline](https://www.wearedevelopers.com/videos/73-implementing-continuous-delivery-in-a-data-processing-pipeline) ## Related Articles - [Navigating the AI Shift](https://www.wearedevelopers.com/magazine/629-navigating-the-ai-shift) - [Never delegate the understanding](https://www.wearedevelopers.com/magazine/749-never-delegate-the-understanding) - [Coffee with Developers - Maria Apazoglou - Making AI understandable for all in production](https://www.wearedevelopers.com/magazine/475-coffee-with-developers-maria-apazoglou-making-ai-understandable-for-all-in-production) - [What is Agentic Programming and Why Should Developers Care?](https://www.wearedevelopers.com/magazine/625-what-is-agentic-programming-and-why-should-developers-care) - [MLOps – What’s the deal behind it?](https://www.wearedevelopers.com/magazine/125-mlops-what-s-the-deal-behind-it) - [MLOps And AI Driven Development](https://www.wearedevelopers.com/magazine/82-mlops-and-ai-driven-development)