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SamuelScar/README.md

Samuel Souza

Backend Developer | PHP, Python, APIs and System Integration

Brazil

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About me

I am a backend-focused software developer with more than five years of experience building and maintaining web systems, APIs, integrations and data-processing solutions.

My strongest professional stack is PHP, Laravel and Slim, but I also develop backend applications and services with Python, FastAPI, Node.js and Express.

Throughout my experience, I have worked with complex business rules, legacy-system modernization, third-party integrations, real-time communication, asynchronous processing, data pipelines and cloud-based services.

I participate in the complete software development lifecycle, including requirements analysis, user stories, use cases, architecture decisions, implementation, automated testing, API documentation, code review, deployment and production maintenance.

I also have practical experience managing application infrastructure with Docker, Linux servers, GitHub Actions, reverse proxies, HTTPS, cloud platforms and deployment automation.

Although backend development is my main area, I am comfortable working across the full application when necessary, including frontend development, database modeling, infrastructure and product decisions.


Professional focus

  • Backend development with PHP, Laravel, Slim, Python, FastAPI, Node.js and Express
  • REST and SOAP API design and integration
  • Integration with external platforms and artificial intelligence services
  • Real-time communication using WebSockets
  • ETL pipelines, web scraping, data normalization and analytical processing
  • Relational database modeling and query optimization
  • Layered architecture, Clean Architecture and design patterns
  • Automated unit and integration testing
  • API documentation with OpenAPI and Swagger
  • Maintenance and modernization of legacy systems
  • Docker-based development and production environments
  • Linux server configuration and application deployment
  • CI/CD and deployment automation with GitHub Actions
  • Requirements analysis, user stories, use cases and technical documentation

Core stack

Backend

PHP Laravel Slim Python FastAPI Node.js Express

APIs and communication

REST API SOAP WebSockets OpenAPI Swagger

Data processing

pandas SQLAlchemy Beautiful Soup Scrapy ETL Web Scraping Data Processing

Databases

PostgreSQL MariaDB MySQL SQLite

Architecture and quality

Clean Architecture Design Patterns PHPUnit Pytest Jest

Infrastructure and delivery

Docker Docker Compose Linux GitHub Actions Nginx Apache Azure AWS Vercel Supabase


Professional engineering highlights

My professional experience includes the development and maintenance of backend systems with complex business rules, external integrations and production-critical workflows.

Some of the areas I have worked with include:

  • Development and modernization of procurement and electronic bidding systems
  • REST and SOAP integrations with external and government-related platforms
  • Real-time application features using WebSockets
  • Performance analysis and optimization of database queries and backend processes
  • Maintenance and gradual modernization of legacy PHP applications
  • Automated deployment workflows using GitHub Actions
  • Docker-based development and production environments
  • Linux server administration and application deployment
  • Services for orchestration and monitoring of asynchronous processing
  • File generation, storage, consolidation and lifecycle management
  • Cloud storage and execution tracking using Azure services
  • Technical documentation, code reviews and software-quality improvements

These experiences involve not only implementation, but also understanding business requirements, investigating production problems, evaluating technical trade-offs and evolving existing systems without disrupting their current workflows.


Selected projects

The most complete product I have independently designed and developed so far.

SIGL is a robust full-stack web platform for creating, organizing and conducting interactive group activities. The project covers the complete product lifecycle, including problem analysis, requirements definition, architecture, interface design, backend development, real-time communication, testing, security, infrastructure and production deployment.

The system includes authentication, different user roles, room access through unique codes, configurable activity flows, real-time communication and interactive controls for managing sessions and participant experiences.

The application runs in a production environment on a Linux VPS using Docker, HTTPS, reverse proxy configuration, domain management, security controls and an organized deployment workflow.

The source code is currently maintained in a private repository because the project is still under active development.

Highlights: Full product development · Real-time communication · Authentication and authorization · Business rules · Docker · Linux VPS · Production deployment


Data engineering and backend application developed with Python for ingesting, validating, enriching, storing and analyzing public expense data from the Brazilian National Supplementary Health Agency.

The project includes a complete ETL pipeline, PostgreSQL persistence, analytical SQL queries and a FastAPI application organized with Router, Service and Repository layers.

It also documents architectural decisions, inconsistencies found in the original datasets, technical trade-offs and the strategies adopted to process heterogeneous public files efficiently.

Highlights: Python · FastAPI · ETL · PostgreSQL · Data validation · Layered architecture


Data collection, processing and analytical solution for public price quotations from Brazilian CEASAs.

The platform combines automated data extraction, normalization, relational storage and an interactive analytical dashboard with filters, indicators, charts, aggregated queries and database-level pagination.

The dashboard was developed with Python and Streamlit, while PostgreSQL and Supabase are used for data persistence. Docker provides a reproducible execution environment.

Related repository: CEASA Data Scraper

Highlights: Web scraping · Data normalization · PostgreSQL · Streamlit · Docker · Data visualization


Web system developed with Laravel for managing blood donation campaigns, collection locations, schedules, appointments and participation reports.

The project demonstrates the implementation of business rules, relational data modeling, administrative workflows and a complete web application using the Laravel ecosystem.

Highlights: PHP · Laravel · Business rules · Relational database · Web application


Interactive educational web application that connects biblical studies, history, music and sound science through multimedia content and three-dimensional models.

The platform includes a responsive catalog, educational pages, historical and scientific content, interactive 3D visualization, audio demonstrations, light and dark themes and augmented-reality experiences for compatible devices.

The project was developed with Vue 3, TypeScript, Vite, Three.js-related technologies, Docker and Nginx, with static deployment through Vercel.

Repository: instrumentos-biblicos-ar

Highlights: Vue 3 · TypeScript · 3D visualization · Augmented reality · Responsive design · Docker


Backend application developed with ASP.NET Core for a personal publishing platform.

The project includes authentication, data persistence, layered architecture and integration with artificial intelligence resources.

This project complements my primary PHP and Python experience by demonstrating familiarity with strongly typed backend development and the .NET ecosystem.

Highlights: C# · ASP.NET Core · Authentication · Layered architecture · AI integration


Additional technical experience

JavaScript TypeScript Vue.js HTML5 CSS3 Bootstrap Tailwind CSS C C++ C# Java

My programming foundation was built with C, including algorithm development and projects related to robotics.

I also have experience with frontend development, C++, C#, ASP.NET Core and basic Java development.


Technical interests

Backend Development · API Design · System Integration · Software Architecture · Real-Time Communication · Web Scraping · ETL · Data Processing · Cloud Services · Performance Optimization · Legacy Modernization · DevOps · Open Source


Contact

LinkedIn · E-mail · GitHub

Pinned Loading

  1. cotacoes-ceasa-scraper cotacoes-ceasa-scraper Public

    Scraper e pipeline ETL para coletar cotações públicas de CEASAs brasileiras, preservar os arquivos brutos e consolidar os dados em uma base normalizada.

    Python 1

  2. ans-despesas-analytics ans-despesas-analytics Public

    Aplicação fullstack com FastAPI, PostgreSQL e Vue.js para análise de despesas da ANS.

    Python

  3. VitaFlow VitaFlow Public

    VitaFlow é um sistema web para organização e acompanhamento de campanhas de doação de sangue, permitindo cadastro de campanhas, locais de coleta, horários, agendamentos, controle de comparecimento …

    PHP

  4. instrumentos-biblicos-ar instrumentos-biblicos-ar Public

    Aplicação web educacional de Realidade Aumentada para ensino de instrumentos históricos mencionados na Bíblia, integrando ciência, fé e tecnologia, focado para o público infantil.

    Vue

  5. BlogSharp BlogSharp Public

    API backend para um Blog Pessoal desenvolvida em ASP.NET Core, com autenticação, persistência de dados, arquitetura em camadas e integração com recursos de IA.

    C#

  6. Cmm Cmm Public

    Compilador da linguagem C em PHP, com lexer, parser, análise semântica, otimizações e geração de Assembly x86-64.

    PHP