Join an elite founding team building the next generation of enterprise AI agents. You will own the full-stack development of human-in-the-loop interfaces that capture operational signals to fine-tune proprietary world models. This role offers the chance to define how large-scale enterprises automate complex workflows while maintaining complete data ownership.
Full-Stack Software Engineer at VC-backed enterprise AI startup
Join an elite founding team building the future of enterprise automation. This VC-backed AI startup is looking for a Full-Stack Engineer to own the interface layer where human intelligence meets agentic workflows. With co-founder level equity and a proven track record in massive enterprises, you'll build the systems that turn operational feedback into autonomous capability. Perfect for an ex-founder or early engineer who wants to ship daily and define a new category of enterprise software.
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Location
Barcelona, Spain or Remote
Compensation
£80k-£140k + Equity
Company
Confidential company
Role overview
About the company
VC-backed enterprise AI startup
What you will do
- Architect and build the review surfaces where human operators interact with and correct AI-driven actions.
- Develop end-to-end features using a modern stack focused on real-time event-sourced systems and high-performance interfaces.
- Design the data signal layer that transforms user interactions into training data for autonomous learning loops.
Who this is a fit for
- Extensive experience in TypeScript and React, with a strong background in building production-grade full-stack systems.
- Previous experience as an ex-founder or founding engineer, capable of owning features from design to deployment.
- Pragmatic, shipping-focused mindset with a deep interest in LLM-in-the-loop product design and agentic UX.
Why this role is remarkable
- Opportunity to join a high-talent density team as one of the first few hires with co-founder level equity.
- Proven product-market fit with successful deployments in massive enterprises, achieving significant operational autonomy.
- Work at the intersection of agentic workflows and fine-tuning loops where the interface directly improves model performance.
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.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.
I recruit from Jack’s network and make the intro when I spot a great match.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.
Jack gets to know what you're great at and what you want next, then searches 15 million jobs daily and helps you discover roles at companies like this.
Meet Jack
What happens next?
Jack’s an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack’s network.
If your profile’s a match and Confidential company wants to meet, Jill will make the intro. In the meantime, Jack will send you excellent alternatives.