Hi, my name is

Júnior de
Oliveira

I build things for the web.

Senior Frontend Engineer specializing in React, Next.js, and TypeScript. I craft scalable, maintainable products that make a difference.

Colatina, ES — Brazil
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01.

About Me

I'm a Frontend Engineer with over 5 years of experience building products that people actually use — from logistics and agriculture to mobility and food services.

Most of my work has been with React, Next.js, TypeScript, and frontend architecture, but what I really enjoy is solving problems in a way that makes life easier for both users and engineering teams.

Over the years, I've helped teams ship faster, clean up complex codebases, and bring more structure to growing products. I like working in environments where I can collaborate closely with product and engineering, understand the "why" behind what we're building, and make decisions that balance technical quality with real business needs.

I also enjoy supporting other developers — whether it's pairing, sharing context, or helping establish patterns that make everyone's work smoother.

Technologies I work with:

React / Next.js
TypeScript
React Native
Node.js
Module Federation
AWS / CI/CD
JO

Júnior de Oliveira

Senior Frontend Engineer

5+
Years Exp
7+
Companies

Languages

Portuguese (Native) English (Professional) Spanish (Basic)
02.

Where I've Worked

Jan 2024 — Jun 2025

Senior Software Engineer

Pizza Hut (Yum! Brands)

Software Engineer contributing to digital products for Yum! Brands across the United States and global markets. Developed scalable features and optimized services for high-traffic environments.

React TypeScript Java AWS Spring Boot

Senior Frontend Engineer

Localiza&Co

Designed and implemented scalable Microfrontend architecture with Module Federation. Enhanced i18n capabilities for multi-country operations across Latin America. Technical mentor for developers.

React Module Federation i18n
Sep 2023 — Jan 2024
Jan 2022 — Aug 2023

Frontend Engineer

Syngenta Digital (via Framework Digital)

Developed core features for Cropwise, Protector, and Protector Analytics supporting users in U.S., South America, and Europe. Built analytics product that became one of the most accessed tools.

React React Native Next.js Jest

Frontend/Fullstack Engineer

Plus Delivery

Worked directly with CTO on the main delivery application. Integrated Magalu's API ecosystem improving tracking accuracy and logistics efficiency. Evolved system architecture and monitoring.

React Native TypeScript Node.js
Sep 2020 — Dec 2021
Nov 2019 — Aug 2020

Software Engineer

Basis Tecnologia da Informação

Developed applications for Brazilian Army and Ibama. Created features focusing on stability, maintainability, and operational efficiency for government systems.

Java Angular Government Systems

Tech Leads Club

Member since Sep 2025

Community focused on advanced software development, careers, technical leadership, and management. Helping elevate the Brazilian tech community beyond senior level.

03.

Skills & Tools

Frontend

  • React.js / Next.js
  • TypeScript / JavaScript
  • React Native
  • Module Federation
  • Redux / Context API
  • Tailwind / Styled Components

Backend & Cloud

  • Node.js
  • Java / Spring Boot
  • AWS (S3, CloudFront)
  • REST APIs / GraphQL
  • Database Design
  • Microservices

Practices & Testing

  • Jest / Vitest
  • Testing Library
  • CI/CD (CircleCI)
  • Clean Architecture
  • Git / GitHub
  • Figma / Design Systems

Certifications

Spring Boot Expert: JPA, RESTFul API, Security, JWT Linux Security SysAdmin in Cloud Organizational Data Security Fundamentals Clean Code e Clean Architecture
04.

Featured Projects

05.

Education

Information Systems

Centro Universitário do Espírito Santo

2010 — 2014

Bachelor's degree focusing on Information Systems Management

Ethical Hacking & CyberSecurity

Centro de Inovação VincIT - UNICIV

2018 — 2019

Post-graduate specialization in security practices

Fullstack Developer

Rocketseat

2019

Intensive bootcamp: Node.js, ReactJS, React Native

Computer Forensics

NID Forensics Academy

2010 — 2011

Professional training in computer forensics investigation

06. What's Next?

Get In Touch

I'm currently open to new opportunities and interesting projects. Whether you have a question, want to discuss a potential collaboration, or just want to say hi, feel free to reach out!

Say Hello