CTO & Co-Founder - Agentic AI (LegalTech)

Antaiventures; Madrid; Híbrido; EUR 125.000 - 150.000; Jornada completa

Descripción de la vacante

A leading AI startup in Madrid seeks a Co‑Founder & CTO to spearhead technological innovation in the legal industry. You will have full autonomy to shape the product vision and lead a high-performing engineering team while ensuring rapid delivery of customer solutions. Significant equity is offered, alongside the opportunity to work remotely or from hubs in Barcelona and Mexico City.

Servicios

Significant equity

Full-stack operator support

Workspace flexibility

Formación

• 5+ years of experience as a Software Engineer.
• You prototype quickly and turn ideas into working features in days.
• You’ve built with modern LLM tools and know what works in production.

Responsabilidades

• Lead product and technology strategy and development from day one.
• Architect applied AI agents that automate workflows in legal services.
• Recruit, coach, and scale a top engineering team.

Conocimientos

Hands-on builder

Practical AI experience

User-value focus

Ownership mindset

Bias for shipping

Team builder

Clear communicator

Herramientas

Modern LLM tools

Dynamic RAG pipelines

Multi-agent workflows

Descripción del empleo

The Opportunity

We are launching an ambitious new venture in the Agentic AI space, and we're looking for a Co‑Founder & CTO to lead product & technology strategy and development from day one. Our vision is to make the legal industry 10× more efficient through AI.

This is a unique opportunity to build a company with us from the ground up, backed by the resources, expertise, and network of Antai.

As a co‑founder, you’ll be in the drivers seat—shaping the vision, setting the pace, and taking ownership. In return, we’ll back you with capital and provide hands‑on support across Product, Tech, Design, GTM, Legal, Talent, Finance, and Fundraising to accelerate your journey from 0 to 1.

The legal industry is primed for AI‑driven disruption.

Pain points are validated — we already have paid pilots running with top international law firms.

Lead the build: architect state‑of‑the‑art applied AI agents that automate workflows and roles across the legal services lifecycle.

Set the product & tech strategy and move fast with full autonomy.

Own the upside: significant co‑founder equity.

Co‑craft the technical North Star with the founding team and convert vision into an aggressive, value‑obsessed roadmap.

Build hands‑on and ship code daily, leveraging the latest AI orchestration techniques (multi‑agent workflows, toolformer, dynamic RAG pipelines) and rock‑solid engineering practices (DDD, SOLID, ruthless automation) to deliver customer value at record speed.

Recruit, coach, and scale a top‑1 % engineering guild spanning backend, frontend, data, and DevOps—shipping product that customers actually use every single week.

Design high‑throughput data pipelines to improve our agents while guaranteeing security and compliance.

Drive a culture of excellence through continuous delivery, rapid experimentation, and metrics‑driven improvement.

Move fast, obsess over customer impact, and work tirelessly to turn an ambitious vision in reality.

5+ years of experience as a Software Engineer

Hands‑on builder. You prototype quickly and turn ideas into working features in days.

Practical AI experience. You’ve built with modern LLM tools—agent orchestration, RAG, embeddings—and know what works in production.

Curious and smart. You track new research and apply what’s useful.

User‑value focus. You measure success by customer impact and time saved, not vanity metrics.

Ownership mindset. You take responsibility for outcomes and think long‑term about product and company value.

Bias for shipping. You pick simple solutions, automate routine tasks, and release early and often.

Team builder. You attract and develop strong engineers and foster a supportive, high‑standards culture.

Clear communicator. You explain technical trade‑offs to both engineers and non‑technical stakeholders.

What We Offer

Day‑1 founding seat. Jump into an ambitious startup from the ground up, with a validated concept and live pilots.

De‑risked upside. Build as a co‑founder on a path charted by Antai’s successful venture‑studio model—capital, playbooks, and network included.

Full‑stack operator support. Access Antai’s expert teams in Product, Engineering, Design, GTM, Legal, Talent, and Fundraising whenever you need them.

Significant equity. Own a sizable stake in this venture and optional carry in other Antai portfolio startups.

Founder community & investors. Join a tight network of serial entrepreneurs and top‑tier backers who’ve scaled category leaders.

Workspace flexibility. Work from our hubs in Barcelona, Madrid, or Mexico City—or stay remote and sync on frequent on‑sites.