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Lucas Pazzim

About

Lucas Pazzim

Lucas Pazzim

Senior Frontend Engineer based in São Paulo, Brazil, building scalable, high-performance web applications with React, Next.js and TypeScript.

I specialize in enterprise-grade interfaces aligned with frontend architecture, usability and business goals. My core expertise includes Web Performance, Technical SEO, Design Systems, Internationalization (i18n) and Accessibility (WCAG).

I have strong experience optimizing Core Web Vitals, reducing bundle size, implementing code splitting and lazy loading, and designing scalable frontend architectures. I have led initiatives that significantly improved performance and organic indexing through metadata best practices, canonical strategies and optimized rendering approaches (SSR, SSG, ISR).

I also bring solid experience in advanced component design, REST/GraphQL integrations, CI/CD pipelines, automated testing (Jest, Vitest, Playwright) and monorepos, working closely with product, design and backend teams to deliver robust, scalable solutions.

Experience

  1. — PresentMaringá, BR

    Senior Frontend Software Engineer

    Treeunfe

    Frontend development and scaling of a complex invoice generation SaaS.

    • Collaborated on a critical core technology migration of a high-throughput invoice generation platform with near-zero downtime, modernizing the stack and improving maintainability.
    • Architected and implemented high-concurrency features supporting 1,000+ simultaneous users.
    • Configured and managed automated CI/CD pipelines and cloud deployments on AWS Amplify.
    • Built scalable web components, enforcing strict code standards, performance optimizations and robust state management.
    • Next.js
    • React
    • TypeScript
    • Tailwind CSS
    • Zustand
    • Zod
    • AWS Amplify

  2. — São Paulo, BR

    Senior Frontend Software Engineer

    UPX

    Scalable web applications with React, Next.js and TypeScript in enterprise environments.

    • Led frontend architecture decisions, including component design and design systems.
    • Optimized Web Performance and Core Web Vitals, improving Lighthouse metrics and load times.
    • Implemented technical SEO strategies, including dynamic metadata and canonical optimization.
    • Designed multi-language (i18n) architectures with dynamic routing.
    • Applied code splitting, lazy loading and bundle optimization techniques.
    • Developed automated tests with Jest, Vitest and Playwright, and managed deployments through CI/CD pipelines.
    • React
    • Next.js
    • TypeScript
    • REST
    • Jest
    • Vitest
    • Playwright

  3. —

    Senior Frontend Software Engineer

    Jestor

    Created and maintained complex components that let users build applications effortlessly in a no-code platform.

    • Continuously improved the application with optimizations, performance gains and new features.
    • Worked with DevOps on frontend integration using Docker, Vite (fast development and HMR) and pnpm.
    • Implemented and enforced coding standards and best practices with Prettier.
    • Built reusable UI components with styled-components.
    • React
    • TypeScript
    • styled-components
    • Docker
    • Vite
    • pnpm
    • Prettier

  4. — São Paulo, BR

    Senior Frontend Software Engineer

    Zends Soluções Tecnológicas

    Built a React application, from capturing business requirements to design, development and testing.

    • Analyzed system and functional requirements and documentation.
    • Designed, developed and tested with HTML5, CSS3, Bootstrap, JavaScript, jQuery and React to meet accessibility and web browser standards.
    • Designed CSS templates used across every page of the website.
    • React
    • TypeScript
    • JavaScript
    • SCSS
    • LESS
    • Bootstrap
    • GitLab

  5. — Santana de Parnaíba, BR

    Senior Frontend Software Engineer

    Embracon

    Built a React application, from capturing business requirements to design, development and testing.

    • Analyzed system and functional requirements and documentation.
    • Designed, developed and tested with HTML5, CSS3, Bootstrap, JavaScript, jQuery and React to meet accessibility and web browser standards.
    • Designed CSS templates used across every page of the website.
    • React
    • TypeScript
    • JavaScript
    • SCSS
    • LESS
    • Bootstrap
    • GitLab

  6. — São Paulo, BR

    Senior Frontend Software Engineer

    Webmotors

    Member of the tech financial team, maintaining and shipping features with a constant focus on performance, usability and presentation.

    • SEO was critical: the product needed to rank highly in Google searches.
    • Upheld quality standards with coding best practices, ESLint and Google Analytics.
    • React
    • Next.js
    • Redux
    • TypeScript
    • SCSS
    • Bitbucket

  7. — São Paulo, BR

    Frontend Software Engineer

    UnitedHealth Group

    Developed efficient, reusable and dependable frontend code.

    • Helped the team create a new product used by hundreds of doctors in their daily consultations.
    • React
    • Redux
    • TypeScript
    • SCSS
    • GitHub

  8. — São Paulo, BR

    Co-founder

    Class T

    Analyzed business requirements, then designed, developed and tested web applications.

    • Designed and developed UIs using HTML, CSS3, JavaScript and JSON.
    • Built responsive websites with JavaScript, jQuery, HTML5, CSS and Bootstrap components.
    • JavaScript
    • jQuery
    • HTML5
    • CSS3
    • Bootstrap

  9. — São Paulo, BR

    Co-founder

    Iunity

    Analyzed business requirements, then designed, developed and tested web applications.

    • Designed and developed UIs using HTML, CSS3, JavaScript and JSON.
    • Built responsive websites with JavaScript, jQuery, HTML5, CSS and Bootstrap components.
    • JavaScript
    • jQuery
    • HTML5
    • CSS3
    • Bootstrap

  10. — São Paulo, BR

    Developer

    Sol Automação Comercial

    Built and maintained a Delphi 7 application.

    • Analyzed system and functional requirements and documentation.
    • Delphi

  11. — São Paulo, BR

    Developer

    HTD Sistemas

    Built and maintained a Delphi 7 application.

    • Worked with backend engineers to optimize existing API calls by deprecating unneeded ones.
    • Delphi

Tech Stack

  • React
  • Next.js
  • TypeScript
  • JavaScript
  • Tailwind CSS
  • Zustand
  • Zod
  • Redux
  • styled-components
  • SCSS
  • Design Systems
  • i18n
  • Accessibility (WCAG)
  • Core Web Vitals
  • Technical SEO
  • REST / GraphQL
  • Jest
  • Vitest
  • Playwright
  • Vite
  • Docker
  • pnpm / Monorepos
  • CI/CD
  • AWS Amplify

Certifications

  • JavaScript Algorithms and Data Structures Masterclass
  • Curso de Inteligência Artificial para Devs
  • Testando JavaScript e React com Jest e Enzyme
  • Testes Automatizados na prática