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jsas4coding/README.md

Jonatas Sas

Jonatas Sas

Backend & Full Stack Developer

Backend and Full Stack Developer with 21+ years of experience designing and maintaining enterprise-grade systems across banking, fintech, e-commerce, SaaS, and real estate sectors.

I specialize in backend architecture, secure API design, and system performance optimization — delivering robust solutions for mission-critical environments with high availability and low downtime requirements. I’ve also developed backends for high-traffic mobile applications and distributed platforms.

Currently working remotely with international teams to build scalable, maintainable, and production-ready systems that support real business operations.

Core Expertise:

  • Languages & Frameworks: PHP (Laravel, Yii2, Magento, WordPress, etc.), Go, Python, Node.js (JavaScript)
  • Frontend: HTML, CSS, JavaScript (React, Vue, Angular)
  • Databases: PostgreSQL, MySQL, MariaDB, etc.
  • Domains: Backend Architecture, Microservices Design, API Development, CI/CD, Test Automation, Secure Coding, Infrastructure Automation, Legacy Modernization, System Hardening, Performance Optimization, SEO Implementation & Audits, Security Reviews

Although I specialize in backend systems, I’m also comfortable working across the full stack when needed — including modern frontend frameworks, CMS platforms like WordPress, and integration-heavy environments.

Committed to code quality, reliability, and long-term maintainability — applying robust testing strategies, automated pipelines, and architectural rigor to ensure consistent delivery.


Selected Open Source Projects


Open to Work On

  • Backend Architecture for Distributed & High-Availability Systems
  • Microservices Design & Implementation
  • API Design & Third-Party Integrations
  • Refactoring & Modernizing Legacy Codebases
  • CI/CD Pipelines & Infra Automation
  • Automated Testing & Quality Assurance
  • SEO Optimization & Technical Audits
  • Performance Optimization & Secure Coding
  • WordPress-based Architecture & Customization
  • Security Reviews & Hardened Deployments

Available for remote freelance opportunities — from architecture planning to end-to-end backend development. Feel free to reach out via Telegram or WhatsApp to start a conversation.


Contact


Engineering stable, scalable, and secure systems that keep real-world businesses running.

Pinned Loading

  1. yii2-m2m-behavior yii2-m2m-behavior Public

    Yii2 behavior for managing many-to-many (M:N) relationships using ActiveRecord with virtual attributes, auto-syncing, and full test coverage.

    PHP 6

  2. tools-electron-app-generator tools-electron-app-generator Public

    Example project for turning websites into standalone Linux AppImages using Electron.

    Python 1

  3. pma-up pma-up Public

    Fully automated phpMyAdmin updater — safely downloads, extracts, backs up and upgrades phpMyAdmin installations. Internal use project. External contributions not accepted. Use as-is or fork.

    Go 1

  4. nyx-solutions/yiitk nyx-solutions/yiitk Public

    YiiTK extension for Yii 2

    PHP 1