Founding Enginner

About Antai Ventures Antai Ventures is a leading venture studio headquartered in Barcelona, with a strong presence across Southern Europe and Latin America. We team up with exceptional entrepreneurs to build disruptive, scalable companies from scratch. Since 2012, we've co-founded 30+ ventures, including Glovo, Wallapop, PlatanoMelon, and PiperAI. Collectively, our startups have raised over $1.5B in funding, generated $3B+ in shareholder value, and created 5,000+ jobs. About Juryo Juryo is building the agentic AI platform for small and mid-sized law firms, starting with high-volume B2C practices (extranjería, LSO, laboral, deudas, civil). Our voice and WhatsApp agents already qualify clients, generate documents, manage cases, and handle billing workflows, delivering over 2× improvement in lead conversion for our customers. We've gone from idea to revenue in months: Multiple paying law firms onboarded Six-digit ARR Daily usage (+200 calls/WhatsApps) by real customers Clear PMF in a massive, fragmented €5B+ market (in Spain alone) Now we're hiring our Founding Engineer. Someone relentless, hands-on, and hungry to build fast. Why this role is special Founding seat in a high-velocity applied-AI startup Direct ownership of systems used daily by customers Greenfield architecture and freedom to shape the tech DNA Extreme autonomy, zero bureaucracy, and daily shipping Your work impacts revenue and customer experience immediately Opportunity to transform one of Europe's most underserved industries If you want to build, not maintain, this is that kind of role. What you'll do: Build Architect and ship agentic workflows across voice, WhatsApp, and email Build RAG pipelines, automated document systems, and high-throughput data flows Ship full-stack features end-to-end Scale Improve latency, reliability, and performance across the platform Harden infrastructure to support thousands of daily agent interactions Set up observability, monitoring, and deployment workflows Own Work directly with legal teams and real users Turn ambiguous problems into shipped product in days Drive engineering culture, best practices, and early hiring principles Take full responsibility from idea → design → code → deployment What we're looking for: Relentless executor You move fast, unblock yourself, and thrive in high-ownership environments You value speed and impact over perfect abstractions Hands-on, end-to-end builder Strong engineering fundamentals across backend, APIs, and product integration Experience with LLMs, agents, or eagerness to learn extremely fast High-agency and independent You don't wait for instructions, you find problems and fix them You act like an owner, not an employee Product-driven You think in terms of user value, not features You enjoy deep immersion in real customer workflows You iterate based on data, calls, and real transcripts Ambitious and mission-aligned You want your work to matter You want meaningful equity You want to help build a company from the ground up What we offer: Competitive salary Meaningful equity with real upside A chance to build the AI backbone for legal services High-trust, high-autonomy environment Based in Barcelona, in-office culture with high collaboration Work on problems that touch thousands of people every week