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Leonardo
Senior Frontend Engineer

I build complex product interfaces.

Senior frontend engineer working across React, Next.js, TypeScript, real-time UI, design systems, performance, and responsive product experiences shaped across sports tech, marketplaces, and B2B platforms.

7+ years across React, Next.js, TypeScript, WebSockets, GraphQL, design systems, and performance-focused delivery.

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Featured work

Production projects across sports tech, marketplaces, and B2B web platforms.

Sports techReal-time UIAdmin toolsMobile-adjacent

LaneTalk

Product UI for live scoring, stats, admin tools, and cross-platform bowling data.

LaneTalk is a bowling product ecosystem connecting bowlers and centers through mobile apps, live scoring, leaderboards, tickets, admin tools, and public product surfaces.

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LaneTalk stats interface across mobile screens
LaneTalk stats interface across mobile screensMobile stats surfaces showing score history, radar data, and bowler-facing performance views.
MarketplaceClassifiedsE-commerce patternsAdmin UI

Revolico

Frontend and product UI for a high-traffic classifieds marketplace.

Revolico is a classifieds marketplace for Cuba with e-commerce-like flows: categories, search, listing detail, publishing, promoted ads, mobile app assets, and admin tooling.

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Revolico mobile search results
Revolico mobile search resultsMobile marketplace results with search, active filters, promoted listings, and view controls.
B2BLead developmentResponsive websiteGraphQL

OpsTalent

Lead frontend development for a responsive B2B website with GraphQL content and polished UI.

A responsive B2B website for an outsourcing and technology company, focused on clear service communication, content-driven structure, and polished production interactions.

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OpsTalent responsive website overview
OpsTalent responsive website overviewResponsive B2B pages presented across device mockups with service and content modules.

Impact

Selected outcomes from shipped frontend work.

35%

average load-time reduction

38%

faster product delivery

40%

faster legacy-app loading after migration

25%

TTFB reduction

88+

Lighthouse scores achieved consistently

Craft

The frontend work behind the interface: real-time UI, responsive layouts, component systems, performance, and interaction details.

Real-time interfaces

Live scoring and state-heavy product surfaces where readability depends on timing, hierarchy, and trust.

Dense responsive layouts

Data-heavy views that need to stay usable across phones, tablets, public screens, and admin contexts.

Design systems and reuse

Component patterns, handoff, and UI consistency across product surfaces without slowing delivery.

Figma-to-code workflow

Bridging design intent and production behavior through close attention to states, constraints, and edge cases.

Performance and Web Vitals

Shipping production interfaces with attention to load times, SSR/SSG, caching, and Lighthouse outcomes.

Motion and interaction polish

Small motion and interaction decisions that make complex UI feel clearer without becoming decorative noise.

About

I work across frontend implementation and product UI, especially where dense workflows need to become clear, fast, and usable.

About LeonardoView archive

Contact

Frontend roles for complex product interfaces.

Email, LinkedIn, and CV are included for hiring context.

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