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Cássio Nascimento


Cássio Gomes do Nascimento

FrontEnd Developer

Email: xpcassio@gmail.com

LinkedIn: https://www.linkedin.com/in/xpcassio/?locale=en_US

Github: github.com/xpcassio

Location: Brazil

Website: xpcassio.com

Cellphone: +55 91 98833-2043


About Me

Senior Frontend / FullStack Developer with over 14 years of experience building scalable, robust, and high-performance web applications. Strong background in custom solution engineering with a technology-agnostic approach, enabling work without limitations of knowledge or technology according to business and product needs. Proven experience in legacy system modernization, frontend architecture, and the development of reusable components and design systems, with a strong focus on code quality, performance optimization, and user experience (UX). Experienced in agile teams, actively contributing to technical decision-making, code reviews, the definition of software engineering best practices, and the implementation of automated testing.


Main Stacks

React React, TypeScript TypeScript, JavaScript JavaScript, Jest Jest, CSS CSS, HTML5 HTML5, PHP PHP, Drupal Drupal, Next.js Next.js, Jquery Jquery

Knowledge

Astro Astro, TailwindCSS TailwindCSS, XState XState, Node.js Node.js, Prisma Prisma, Vitest Vitest, Playwright Playwright, Cypress Cypress, GitHub Copilot GitHub Copilot, Google Cloud Google Cloud, PostgreSQL PostgreSQL, MongoDB MongoDB, Mysql Mysql, Git Git, Linux Linux, Sass Sass, Material Design Material Design, Bootstrap Bootstrap, Laravel Laravel, Jekyll Jekyll, AngularJS AngularJS, Scriptcase Scriptcase, GraphQL GraphQL, Express Express, claude claude, PHPunit PHPunit

Professional Experiences

06/2025 - 12/2025
AFYA Senior Front-End Engineer - Contract

Senior Front-End Engineer responsible for modernizing the Afya - Iclinic portal, leading the refactoring of legacy systems to improve performance, scalability, and maintainability.

Competências: Legacy systems, Architecture (microfrontends, reusable components), Integration (RESTful APIs, GraphQL), Code quality (clean code, SOLID, code review), Agile methodologies (scrum, kanban, lean), Design system, UI/UX, CI/CD pipelines, Testing (unit, integration, and E2E), Error and performance monitoring, State management, Innovation and AI

06/2021 - 05/2025
CI&T Senior Front-End Engineer - Full-Time

Senior Front-End Engineer working across multiple enterprise-scale projects, including an integrated portal for Planet, including an integrated portal for Janssen (Johnson & Johnson’s pharmaceutical division), an institutional website for PicPay, and an integrated ordering system for Domino's Pizza.

Competências: Legacy systems, Architecture (microfrontends, reusable components), Integration (RESTful APIs, GraphQL), Code quality (clean code, SOLID, code review), Agile methodologies (scrum, kanban, lean), Acquia tools, Design system, UI/UX, CI/CD pipelines, Testing (unit, integration, and E2E), Error and performance monitoring, State management, Innovation and AI

04/2020 - 04/2021
Secretary of Finance – State of Pará Front-End Engineer - Contract

Front-End Engineer with a strong focus on user experience and software engineering, contributing to administrative web applications for the state government finance portal.

Competências: Legacy systems, Agile methodologies (scrum, kanban, lean), Architecture (microfrontends, reusable components), Code quality (clean code, SOLID, code review), UI/UX, Error and performance monitoring

05/2018 - 12/2019
BRFlor Full-Stack Engineer - Full-Time

Full-Stack Engineer responsible for building and maintaining administrative systems for the wood extraction and processing industry at BRFlor.

Competências: Relational databases, UI/UX, Error and performance monitoring

01/2017 - 01/2018
UFPA – Software Engineering Laboratory (LABES) Junior Front-End Engineer - Contract

Junior Front-End Engineer focused on usability and user experience, developing websites and internal systems at the Federal University of Pará’s Software Engineering Laboratory.

Competências: Relational databases, UI/UX, Error and performance monitoring

03/2012 - 04/2018
Metaweb Internet Ltd. Junior Full-Stack Engineer - Full-Time

Junior Full-Stack Engineer developing administrative dashboards and websites for a hosting services company. Also provided technical support related to application code and databases.

Competências: Legacy systems, Relational databases, UI/UX, Error and performance monitoring


Certifications

Scrum Foundation Professional Certificate SDPC Completed Concluído

Idioms

English – Advanced / Fluent (reading, writing, and speaking) ILAC • International Language Academy of Canada
English – Advanced / Fluent (reading, writing, and speaking) Voxy Proficiency Achievement Certificate

Education

Web and Mobile Development IFsulMG • Instituto Federal de Educação, Ciência e Tecnologia do Sudeste de MG In progress In progress
Web Management Specialization IESAM • Instituto de Ensino Superiores da Amazônia Completed Completed
Bachelor of Computer Science CESUPA • Centro Universitário do Estado do Pará Completed Completed