Available for new challenges

Lucas Linhares

Senior Front-End Engineer | React Specialist.
I build fast, scalable e-commerce and web applications, and measure the outcome in load time and conversion.

View my work Download CV

2012
The year I started working on the web
−35%
Page load time on Studio Z's e-commerce
+15%
Mobile conversion at Studio Z
−25%
Checkout errors at Studio Z

// My Journey

Professional Experience

Main Stack

React.js
TypeScript
Next.js
Vue.js
Three.js / HTML5 Canvas
Tailwind CSS
Redux Toolkit
Node.js
Performance
Core Web Vitals

Studio Z

Senior Front-End Engineer

01/2020 - Present

Front-end technical lead for a major footwear retailer (100+ stores), responsible for the scalability, performance and architecture of its high-traffic e-commerce platform.

Architecture & migration: I designed and built critical features with React.js and Liquid, and led the migration of legacy jQuery components to a modern React.js architecture, reducing technical debt.
Performance: I optimized the application around Core Web Vitals (LCP, CLS) with lazy loading, image optimization and code splitting, resulting in a 35% reduction in page load times.
Conversion & integration: I contributed to a 15% increase in mobile conversion through UI/UX improvements. I designed and managed API integrations (payment gateways, ERPs) in the Linx/VTEX ecosystem, reducing checkout errors by 25%.
Leadership & mentoring: I mentored junior developers through code reviews and pair programming, applying quality standards (ESLint, Prettier) and automated testing workflows.

React.js
Next.js
Liquid
TypeScript
Tailwind
VTEX
Linx Commerce

Hogarth Worldwide

Front-End Developer

10/2017 - 09/2019

Built digital assets for Fortune 500 technology clients at a global production agency.

High-fidelity UI: I developed landing pages and web applications with Vue.js, React.js and GSAP, following global brand guidelines and accessibility standards.
Automation & DCO: I created reusable code libraries and automation templates for Dynamic Creative Optimization (DCO), reducing development time for localized campaigns by 40%.
Global collaboration: I worked with international teams across time zones, using Jira and Bitbucket to manage the backlog and meet tight deadlines.
QA: I implemented cross-browser compatibility testing to ensure a consistent experience across platforms.

Vue.js
React.js
GSAP
HTML5/CSS3
Jira / Bitbucket

Competence Comunicação

Full Stack Developer (Tech Lead)

08/2015 - 10/2017

I ran the web development department, overseeing the full software development lifecycle (SDLC) of 10+ simultaneous client projects.

Full stack engineering: I built custom web applications with Laravel (PHP) and JavaScript, including authentication, MySQL databases and responsive interfaces.
Process modernization: I moved the team to Git version control and introduced agile project management (Trello), improving collaboration and delivery speed.

Laravel
PHP
JavaScript
MySQL
Git
Agile

GAD'

IT Support & Web Developer

05/2012 - 08/2015

I maintained and optimized internal web applications and servers with PHP and JavaScript, ensuring the availability of the agency's infrastructure and operations.

PHP
JavaScript
IT Support
Servers

// What I Built

Featured Projects

Marni Web Composer

Creator & Front-End Developer

2026

Marni Web Composer is an open-source, responsive web tool for music composition, built to write and edit scores for the game Black Desert Online.

The application includes a full Piano Roll, MIDI file import and an audio engine using real instrument samples. Its standout feature is exporting compositions directly to the game's native binary format, with options for velocity compression and transposition.

Technical highlights: a mobile-optimized interface with touch controls for editing notes, a side navigation drawer, and real-time global audio effects in the browser, such as Reverb, Delay and Chorus.

React
TypeScript
Web Audio API
Tailwind CSS

xtart

Full Stack Developer

2026

The xtart platform combines a portfolio and media kit, built from scratch for a filmmaker and content creator. The goal was a visually striking showcase with a cinematic identity that the client can maintain on their own.

Its standout feature is a custom admin panel (CMS) for managing the bilingual site's translations, navigation links, product curation, partner brands and a portfolio with layouts adapted to horizontal (16:9) and vertical (9:16) videos.

Technical highlights: Instagram Graph API integration to update media kit metrics, with server-side caching, automatic image conversion to WebP in PHP, email sending and a custom Design System.

React
Tailwind CSS
PHP
MySQL
Instagram Graph API

Darkviper Studio

Full Stack Developer

2025 / 2026

Darkviper Studio is an e-commerce web platform with its own admin panel. I built the project's full stack architecture, with an admin area for managing products, orders, quotes, shipping and users, plus the public storefront.

The panel handles listings, media upload and processing (compression and conversion), reports, shipping quotes and permission management. The Node/Express REST API has JWT-authenticated endpoints, validation, input sanitization and centralized error handling. The system also sends email with Nodemailer and integrates payments through Mercado Pago.

Technical highlights: Node.js and Express backend, image optimization with sharp, lightweight queues for media processing, MySQL database, file uploads with multer, API documented with Swagger, and an admin panel in React + Vite with Tailwind CSS.

React
Vite
Tailwind CSS
Node.js
Express
MySQL
Sharp
Nodemailer
Mercado Pago

Feminipsum

Front-End Developer

2021

Feminipsum is a text generator, similar to the classic Lorem Ipsum, with the social purpose of raising awareness about sexism against women.

The tool provides creative, impactful placeholder text for designers and developers to use in their mockups.

Credits: the original idea and layout of this project were conceived by Luiza and Vitória.

React.js
Bootstrap 5
Node.js

Shall we work together?

Have a front-end role or project? Tell me what you need and I'll reply by email.