We are a product team within Leadtech's AI-LAB. Our job is to research, prototype, develop, launch and scale challenging AI products across the Leadtech portfolio.
We're looking for a Senior AI Frontend Engineer who can launch a product and scale it: someone with experience in UX/UI design, A/B testing and product metrics, and who incorporates AI-native tools by default.
This is a frontend-first role with full-stack reach.
What You Will Do
Take new products from zero to launch and beyond. You'll be involved from ideation and research through prototyping, build, release and scale, owning features end-to-end.
Prototype fast. Turn a concept into something users can click within days, put it in front of them, and double down or discard it based on what you learn.
Scale what works. Once a product finds traction, you'll grow it: hardening the codebase for a larger user base, keeping performance and quality high as scope expands, and evolving features based on how real users behave.
Own the frontend: architecture, component library, design system, and the UX that make a great product.




Design and build high-converting landing pages, checkout flows and paywalls. You'll work on the surfaces where revenue happens, achieving the best conversion will be part of your job.
Bring AI into the development process itself. You'll design and integrate LLM-powered features into our products as well as create skills, automations and internal tooling that make the team faster.
Ship to learn. Proactively instrument features, run experiments, read the funnel data, and iterate based on what you discover. You treat metrics as a compass.
What You Will Bring
5+ years of frontend engineering, with deep TypeScript and React proficiency (Hooks, Context API, state management, Vite, Tailwind, Shadcn UI) and a track record of owning significant surface area.
You have taste. You can distinguish between good and bad UX, articulate why, and share examples from your own work to demonstrate it. You're comf

📌 Senior AI Full Stack Engineer (España)
🏢 Leadtech
📍 España