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Manuel UserMU
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Manuel User

@manueluser12

Full-Stack and AI Engineer building a production WhatsApp booking agent that handles appointments, deposits, and gift cards.

Uruguay
Message

I built and run a production booking agent for Japanese Head Spa Marbella that handles customer conversations, availability, appointments, deposits, and gift cards on WhatsApp and Instagram. Its 14 function-calling tools use schema validation and business rules, with 234 multi-turn scenarios and 799 intent-classification cases in its evaluation suite.

At DSpot, I cut First Contentful Paint by 40% on Fusion, the Sky Ecosystem’s public transparency dashboard, and designed a TypeScript and Tailwind design system that increased team development velocity by 30%. Earlier, I reduced API payload size by 50% at Fulltime and integrated Prebid.js header bidding at E-planning.

Experience

Work history, roles, and key accomplishments

JM
Current

AI Booking Agent & Sales Sync

Japanese Head Spa Marbella

Jan 2026 - Present (10 months)

Built and run a production conversational agent on WhatsApp and Instagram that handles bookings, availability, deposits, and gift cards end to end. Designed the agent around 14 function-calling tools with schema validation and deterministic business rules.

DS

Senior Full Stack Engineer

DSpot

Dec 2021 - Oct 2026 (4 years 10 months)

Cut First Contentful Paint by 40% on Fusion, the public transparency dashboard of the Sky Ecosystem, by owning the frontend architecture and server/client rendering split in Next.js. Increased team development velocity by 30% by designing and maintaining the Powerhouse Design System.

FU

Software Developer

Fulltime

Nov 2019 - Sep 2021 (1 year 10 months)

Reduced API payload size by 50% by designing and optimizing GraphQL schemas and resolvers in Node.js. Shipped production React Native apps for industrial clients with real-time inventory management, logistics tracking, and offline-capable data flows.

EP

AdTech Developer

E-planning

Aug 2018 - Nov 2019 (1 year 3 months)

Integrated Prebid.js header bidding to make ad auctions more competitive on live inventory, increasing client ad revenue.

Education

Degrees, certifications, and relevant coursework

CV

Central University "Marta Abreu" of Las Villas

B.Sc., Computer Science

2010 - 2014

B.Sc. in Computer Science from Central University "Marta Abreu" of Las Villas, Cuba, from 2010 to 2014.

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