Founding Enginner - Agentic AI (LegalTech)

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.

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.

• 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.

• 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

• Improve latency, reliability, and performance across the platform

• Harden infrastructure to support thousands of daily agent interactions

• Set up observability, monitoring, and deployment workflows

• 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

• You move fast, unblock yourself, and thrive in high-ownership environments

• You value speed and impact over perfect abstractions

• Strong engineering fundamentals across backend, APIs, and product integration

• Experience with LLMs, agents, or eagerness to learn extremely fast

• You don’t wait for instructions, you find problems and fix them

• You act like an owner, not an employee

• 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

• You want your work to matter

• You want meaningful equity

• You want to help build a company from the ground up

• 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