Hello, my name is João Neris

Senior III
Frontend Developer

Illustration - JNeris
Profile - JNeris

About

Front-end Engineer with over 6 years of experience in developing scalable, high-performance, and results-oriented web applications. Specialist in React.js, Next.js, and JavaScript, with a strong track record in building applications from scratch to production, integrating with RESTful APIs, and optimizing performance based on metrics.

Experience in high-traffic projects and collaboration with design and product teams, ensuring efficient, reusable interfaces focused on user experience.

Experiences

Senior III Front-end Developer@Cashway

Fev 2025 - Nov 2025
  • Developed SPA applications using React.js and TypeScript for a white-label financial platform
  • Built reusable and component-based interfaces focused on scalability and maintainability
  • Integrated and consumed authenticated RESTful APIs
  • Organized data flow and managed state using Redux and Context API
  • Applied best development practices, responsive design, and Clean Code principles
  • Implemented and handled encrypted data in authentication flows and secure API communications

Mid-Level I Front-end Developer@Ateliê de Propaganda

Nov 2022 – Sep 2024
  • Developed scalable web applications using React.js, Next.js, TypeScript, and JavaScript ES6+
  • Created responsive, component-based, and mobile-first interfaces handling thousands of simultaneous accesses
  • Integrated RESTful APIs and aligned business rules with back-end teams
  • Participated in CI/CD workflows and automated build and deployment processes
  • Collaborated in alignment ceremonies with multidisciplinary teams in agile environments using Scrum/Kanban

Mid-Level II Front-end Developer@E-moving

Mar 2022 – Nov 2022
  • Improved internal systems focusing on usability and performance
  • Integrated RESTful APIs and optimized data flow
  • Developed digital solutions focused on lead generation
  • Directly contributed to a 62% increase in conversion rates compared to offline materials

Junior/Mid-Level I Front-end Developer@Defoco Design

Feb 2019 – Mar 2022
  • Development of institutional websites and web applications with a focus on performance
  • Implementation and optimization of interfaces based on Google Lighthouse metrics
  • Up to 86% reduction in loading time in specific projects
  • Customization of WordPress themes and system integration

Projects

Rafael Radesco - JNeris | Designer, Front-end Developer
Rafael Radesco

Wordpress - PHP - MySQL - Boostrap - JavaScript

Alpha VET BR - JNeris | Designer, Front-end Developer
Alpha VET BR

Wordpress - PHP - MySQL - Boostrap - JavaScript

DM Vet - Diagnóstico em Medicina Veterinária - JNeris | Designer, Front-end Developer
DM Vet - Diagnóstico em Medicina Veterinária

Wordpress - PHP - MySQL - Boostrap - JavaScript

LG Concurso Cultural - XboomBastic - JNeris | Designer, Front-end Developer
LG Concurso Cultural - XboomBastic

React.js - JavaScript - Node.js - TailwindCSS

Seagate Central - JNeris | Designer, Front-end Developer
Seagate Central

React.js - TypeScript - Node.js - TailwindCSS

Portal Eu Escolho LG - JNeris | Designer, Front-end Developer
Portal Eu Escolho LG

React.js - TypeScript - Node.js - TailwindCSS

Doremus - JNeris | Designer, Front-end Developer
Doremus

Wordpress - PHP - MySQL - Boostrap - JQuery

Alpha Bier - JNeris | Designer, Front-end Developer
Alpha Bier

Wordpress - PHP - MySQL - Boostrap - JQuery

Iti Alimentos - JNeris | Designer, Front-end Developer
Iti Alimentos

Wordpress - PHP - MySQL - Boostrap - JQuery

Raimar Distribuidora - JNeris | Designer, Front-end Developer
Raimar Distribuidora

Wordpress - PHP - MySQL - Boostrap - JQuery

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