Full-Stack Engineer (€45k-€60k + Equity) at Antai Ventures-backed AI legal-tech startup

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Job Title

Full-Stack Engineer

Salary

€45k-€60k + Equity

Company Description

Antai Ventures-backed legal-tech startup building an AI operating system for B2C law firms

Job Description

Join the founding team as the second engineer building the autonomous backbone for modern law firms. You will scale production systems featuring multi-agent pipelines and durable workflows. Working directly with founders, you’ll ship high-impact features across the full stack to automate client intake, qualification, and case management for major international firms.

Location

Barcelona, Spain

Why this role is remarkable

• Backed by the venture studio behind $1B+ unicorns like Glovo and Wallapop, offering unique access to a world-class startup ecosystem.
• Direct impact on a live, revenue-generating product already delivering 2x lead conversion improvements for top-tier legal clients.
• Founding-stage equity and ownership of technical direction in a high-bandwidth, in-person environment designed for maximum velocity.

• Design and execute the product roadmap from database schemas in Supabase to polished React components using Next.js.
• Build and refine the AI infrastructure layer, including RAG pipelines and agentic workflows using LangChain and LangGraph.
• Maintain high engineering standards within a Turborepo setup, pushing code to production daily to iterate based on real-time user feedback.

• 3+ years of production experience with TypeScript, React, and Node.js, showing the ability to ship complex, multi-tenant SaaS features.
• Expertise in maximizing output through AI coding agents like Claude or Cursor to manage high-velocity development cycles.
• Local to Barcelona with a hunger for a "9-9-6" hard-charging startup culture and experience in durable workflows or LLM orchestration.

Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.

And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.

Next steps

Step 1. Visit the job listing.

Step 2. Click 'Talk to Jack', or go straight there: https://www.jackandjill.ai/jobs/full-stack-engineer-45k-60k-equity-at-antai-ventures-backed-ai-legal-tech-startu-efc517d0-1b86-452d-94dc-99c9db70e55e?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_efc517d0-1b86-452d-94dc-99c9db70e55e

Step 3. Talk to Jack so he can understand your experience and ambitions.

Step 4. Jack will make sure Jill (the AI agent working for the company) considers you for this role.

Step 5. If Jill thinks you're a great fit and her client wants to meet you, they will make the introduction.

Step 6. If not, Jack will find you excellent alternatives. All for free.

We never post fake jobs

This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network.

Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description.

We appreciate this can make them look a bit suspect, but there isn't much we can do about it.

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