Founding Engineer - Legal Tech (Juryo.ai)

Department: Portfolio Companies

Location: Barcelona Office

Employment Type: FullTime

🌍 About Antai Ventures
Antai 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 2012 we have co-founded +30 companies including Glovo, Wallapop, PlatanoMelon, and Piper. Our ventures have raised more than $1.5B in funding, have generated more than $3B in shareholders value and currently employ more than 3000 people.

🚀 Join the team building the AI Operating System for Law Firms

Juryo is the next-generation AI operating system built specifically for high-volume, B2C law firms. We are tackling one of the toughest challenges in the legal industry: replacing scattered tools, manual bottlenecks, and overloaded staff with a seamless, intelligent platform.

We provide law firms with an autonomous workforce and the software in which it runs. Juryo deploys a specialized team of AI agents to run the firm's core operations 24/7. Our intelligent agents seamlessly handle the entire client lifecycle across multiple channels

We are a fast-growing startup making waves in the industry. In just our first few months, we are already working with the biggest law firms in Spain, have raised money from tier-1 VCs and angels and validated our vision in one of the most demanding professional markets. We are now building the talented team that will scale Juryo into a global platform.

🎯 The Role

You will work directly with the founding team, taking ownership of key feature verticals and scaling our existing production systems. This is a role for a "builder" who loves high-bandwidth, in-person collaboration and wants to see their code impact users immediately.

🛠️ What you’ll do:

• Execute the Roadmap: Translate product requirements into high-quality code across the entire stack, from database schemas to polished React components.

• Build the software layer: Our agents need software to operate on. You will build it.

• Scale our AI Infrastructure: Help refine our RAG pipelines and agentic workflows to ensure reliability for legal professionals.

• Maintain High Standards: Work within our Turborepo setup to ensure our codebase remains modular, tested, and easy to navigate.

• Ship Daily: We value agency. You’ll be expected to push to production frequently and iterate based on real-time feedback.

⚙️ Our Tech Stack

• Frontend: TypeScript, React, Tailwind CSS, Next.js.

• Backend: Node.js, Supabase/Postgres (RLS, Migrations, Triggers).

• AI/Data: LangChain/LangGraph, AI SDKs, Vector Databases, OCR processing.

• Infrastructure: Serverless functions, Turborepo.

🔍 What We’re Looking For

• Hard worker: Does 9-9-6 excites or scares you? If it scares you, you’re not the right fit. If not, you’ll fit right in. We are a bunch of hard-charging people that want to make a dent in the world and will spare no energy to do so

• Claude master: You have figured out how to use agentic coding agents to maximize your output. You’re not stuck writing lines of code yourself, but rather mostly supervising/giving direction to Claude (or similar).

• 3+ Years of Production Experience: You know how to build for real users, not just "hello world" projects.

• Full-Stack Fluency: You are equally comfortable debugging a complex SQL query as you are centering a div.

• The "Generalist" Edge: You understand multi-tenant SaaS architecture, security scoping, and how to build for scale.

• In Barcelona or Willing to relocate: This is a 100% on-site role. We believe the best early-stage products are built in the same room.

🌟 Preferred Experience

• Experience with Supabase/Postgres (specifically RLS and migrations).

• A degree in Computer Science or related study.

• Familiarity with Monorepo tooling (Turborepo).

• A background in (or a deep hunger for) AI Agent orchestration and RAG pipelines.

• Understanding of durable workflows and human-in-the-loop systems.

🤝 What we offer

• The ride of a lifetime. There are very few companies with this level of ambition and speed of execution in the world, let alone in Spain…

• Working alongside fellow ambitious, high-performing and fun group of people.

• The steepest learning curve you can imagine. We are riding at the cusp of a massive technology transformation, maybe the biggest yet. We offer the chance to shape it.

• Independence to shape the way you work and make fast decisions.

• Above-market compensation. We believe people should be compensated fairly (above Spanish rates), and that you should be focused on building and not worried about your finances.

• Meaningful equity potential. We expect you to “think like an owner”, but that’s because you’ll also be one.