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HigorMoriyamaSouza/README.md

Hi, I'm Higor Moriyama Souza

Software Engineer | Backend & Full Stack Developer

JavaScript • TypeScript • Node.js • Java • REST APIs • PostgreSQL • MySQL • Docker

I am a Software Engineer with enterprise experience developing backend services, full stack applications, and maintaining and modernizing production systems used by Atos and Volkswagen.

My strongest areas are backend development, REST API design, system analysis, technical documentation, and legacy-system modernization. I enjoy understanding complex codebases, solving production problems, and turning undocumented systems into maintainable software.

  • Based in Itapeva, São Paulo, Brazil
  • Open to remote opportunities in Brazil and internationally
  • Portuguese: Native
  • English: Fluent
  • German: Beginner

Professional Experience

Atos — Enterprise Full Stack Development

Contributed to the development and maintenance of MyAccess, an enterprise web and mobile platform for meeting scheduling and visitor-access management.

Technologies: Angular, React Native, Node.js, NestJS, PostgreSQL, Docker

Key contributions:

  • Developed and maintained full stack features for web and mobile applications
  • Designed and implemented backend services and RESTful APIs
  • Implemented database operations and integrations
  • Supported workflows involving meeting scheduling, visitor invitations, QR-code access, and corporate access-control systems
  • Worked within Agile teams using Git, GitHub, code reviews, and sprint planning

Volkswagen — Legacy System Modernization

Worked on the modernization and stabilization of Partmon, a legacy Java manufacturing system used in Volkswagen production environments.

Technologies: Java, Apache Tomcat, MySQL, Bitbucket

Key contributions:

  • Reverse engineered an undocumented monolithic Java application
  • Analyzed legacy architecture, infrastructure, business rules, and data flows
  • Discovered that two factories were running separate application versions and infrastructures
  • Replaced an unstable external database dependency with a structured-file ingestion process
  • Corrected data-processing and consistency problems
  • Produced technical documentation for future maintenance and modernization
  • Supported infrastructure migration and application deployment
  • Contributed to estimated performance improvements of approximately 70–90% in critical workflows

Featured Projects

Order Application

Backend REST API for order management.

JavaScript • Node.js • Express.js • MySQL • JWT • Postman

  • Complete CRUD operations
  • JWT-based authentication
  • Modular backend structure
  • API documentation with Postman
  • Transactional order-data management

View API documentation

Around the U.S.

A responsive social-style web application built with Vanilla JavaScript and integrated with an external REST API.

JavaScript ES6+ • HTML5 • CSS3 • REST API • Object-Oriented Programming • BEM

  • Loads profile information and image cards from an external API
  • Allows users to edit profile details and update their avatar
  • Supports creating, liking, unliking, previewing, and deleting image cards
  • Uses reusable ES6 classes with separated responsibilities
  • Includes client-side form validation and loading feedback
  • Provides responsive layouts and accessible modal interactions
  • Organizes styles using the BEM methodology and modular CSS

View live application

Expense Tracker

A lightweight expense-management application built with Vanilla JavaScript.

JavaScript • HTML5 • CSS3 • LocalStorage

  • Budget and expense management
  • Category-based expense tracking
  • Real-time statistics
  • Persistent browser storage
  • Dynamic interface updates without page reloads

View live application

Technical Skills

Professional experience

  • Languages: JavaScript, TypeScript, Java
  • Backend: Node.js, NestJS, Express.js, REST APIs
  • Frontend: Angular, React, React Native, HTML5, CSS3
  • Databases: PostgreSQL, MySQL
  • Tools and platforms: Docker, Apache Tomcat, Git, GitHub, Bitbucket, DBeaver, MySQL Workbench
  • Practices: Agile, Scrum, code reviews, debugging, technical documentation, clean code, object-oriented programming, system analysis

Additional hands-on learning

  • Spring Boot and Spring Security
  • AWS fundamentals
  • Docker and containerized environments
  • API security and OWASP concepts
  • Microsoft Azure AI Fundamentals

Education

  • Technologist Degree in Systems Analysis and Development — Estácio University
  • Web Development Program — TripleTen, in progress
  • Java Development with AI, Docker and AWS Bootcamp — Accenture / DIO
  • Java Systems Development Bootcamp — Atos / UFN

Current Focus

  • Backend engineering with Node.js and Java
  • REST API architecture and security
  • Enterprise application development
  • Legacy-system modernization
  • Testing, Docker, documentation, and maintainable software design

Contact

Pinned Loading

  1. order-application order-application Public

    Backend service for managing transactional order data using a RESTful API.

    JavaScript

  2. web_project_around_pt web_project_around_pt Public

    Responsive social-style web application built with Vanilla JavaScript and integrated with an external REST API.

    JavaScript

  3. web_project_expenses_pt web_project_expenses_pt Public

    A lightweight expense tracking application built with Vanilla JavaScript, focused on clean state management, data persistence, and dynamic UI updates.

    CSS