Open to opportunities

Jesús User

@jessuser10

Message

Senior Frontend Engineer focused on UX, AI-driven solutions, and continuous delivery.

Spain

Message

What I'm looking for

I seek frontend roles that emphasize UX, fast delivery, AI-driven features, strong testing, and opportunities to shape design systems and conversion optimization.

I am a Senior Frontend Engineer driven by user experience and continuous learning, with hands-on experience improving conversion rates, stabilizing production, and building AI-assisted features for customer-facing platforms. I have led CRO initiatives, implemented comprehensive testing (Cypress, React Testing Library, Datadog Synthetic), and contributed to a multi-year design system migration using Storybook and a dedicated UI repository.

I build and ship features rapidly in one-week sprint environments and have developed tools ranging from 3D ad-placement managers to responsive SVG systems and mobile-adapted apps with Capacitor. I am currently developing an AI-powered social cooking platform and actively work on integrating training models to provide chat assistance for booking and support flows.

Experience

Work history, roles, and key accomplishments

Current

Senior Frontend Engineer

Current

Exoticca

Dec 2021 - Present (4 years 3 months)

Led frontend efforts including Sentry backlog reduction, A/B testing that improved conversion by 3%, and migration to a new design system while building an agents training model for chat assistance.

React TypeScript Storybook Cypress A B Testing Design Systems Sentry

Mid Frontend Engineer

La Liga Tech

Feb 2021 - Dec 2021 (10 months)

Built tooling for 3D ad placement on players’ equipment and assessed candidate technical tests to support engineering hiring and product development.

React JavaScript Tooling TypeScript UI UX Testing

Frontend Engineer

May 2019 - Feb 2021 (1 year 9 months)

Developed a campus management app for the US market and built a responsive SVG operation platform using React, Redux and TypeScript; adapted the app for mobile with Capacitor.