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sabbajohn/README.md

👋 Hi, I'm Johnnathan Sabbá

Senior Backend Developer, Tech Lead, Consultant, and Systems Integration Specialist.

I'm a technology nerd driven by curiosity, complex problems, and the challenge of turning fragmented business needs into reliable software. I’ve been involved with IT since 2009 and professionally building software since 2016, working across backend engineering, infrastructure, integrations, automation, cybersecurity, IoT, and technical leadership.

Today, I work mainly with backend architecture, ERP and fiscal systems, integrations, infrastructure, compliance-heavy environments, and team leadership.


🚀 Current Roles

  • Software Engineering Manager & Tech Lead at Freeline Informática / Faives Tecnologia
    Leading development teams, restructuring engineering processes, mentoring junior developers, and building ERP, fiscal, financial, and infrastructure-oriented systems.

  • Founder & Consultant at Sabba Sistemas Ltda
    Consulting in software development, team structuring, developer outsourcing, technical training, ERP/CRM customization, TOTVS/Winthor integrations, and custom business systems.

  • Founder at Vora Sys Ltda
    Building modern solutions for growing businesses, with focus on integrations, automation, communication platforms, infrastructure, and custom software.


🧠 Professional Background

My journey started with networks, infrastructure, technical support, and public-sector systems. Over time, I migrated deeply into software development, building systems for e-commerce, logistics, fintech, blockchain, fiscal automation, ERP platforms, email infrastructure, and global enterprise integrations.

Some highlights from the path:

  • Built and optimized high-traffic systems handling tens of thousands of simultaneous users.
  • Worked with fiscal, accounting, banking, and regulatory integrations in Brazil.
  • Developed e-commerce platforms and marketplace integrations.
  • Built automation systems for logistics, accounting, and operational workflows.
  • Worked with global HR integrations for John Deere through Meta.
  • Helped build compliance and anti-abuse systems for email service platforms.
  • Led and mentored junior developers, support analysts, and technical teams.
  • Developed custom ERP, CRM, and business management systems across multiple industries.
  • Worked with cybersecurity, IoT, embedded devices, RF analysis, and open source firmware communities.

⚡ What I Do

Software Architecture & Backend Engineering

Designing reliable, scalable, and maintainable systems using technologies like PHP, Laravel, Python, Java, Node.js, PostgreSQL, Redis, Docker, and cloud infrastructure.

Systems Integration

Building bridges between ERPs, fiscal systems, banking APIs, marketplaces, payment gateways, logistics providers, email platforms, and legacy systems.

Technical Leadership

Structuring development teams, mentoring junior developers, defining engineering standards, improving delivery processes, and connecting technical decisions with business goals.

Compliance-Oriented Systems

Working with systems that require precision, auditability, and regulatory awareness, especially in fiscal, financial, accounting, consumer protection, and email compliance environments.

Cybersecurity, IoT & Infrastructure

Exploring security by design, embedded systems, ESP32/ESP8266 devices, RF communication, home labs, self-hosted infrastructure, VPNs, reverse proxies, automation, and monitoring.


🛠️ Main Stack




🔧 Areas of Interest

  • ERP and fiscal systems
  • Brazilian tax and fiscal document integrations
  • Banking and financial integrations
  • Email infrastructure and deliverability
  • Anti-abuse and compliance systems
  • Developer tooling and automation
  • DevOps and self-hosted infrastructure
  • Cybersecurity labs and research
  • IoT, ESP32, ESP8266, and embedded systems
  • RF communication and wireless security
  • Open source and technical education

📌 Selected Experience

Freeline Informática / Faives Tecnologia

Currently leading engineering efforts around ERP development, Brazilian fiscal document issuance, accounting workflows, financial integrations, infrastructure, and team restructuring.

Sabba Sistemas Ltda

Consulting and custom development for companies needing ERP/CRM customization, team structuring, technical training, outsourcing, legacy modernization, and system integrations.

LetterHead AI

Worked as Senior Full-Stack Engineer and Tech Lead, building compliance, anti-spam, content scanning, and deliverability systems for high-volume email infrastructure.

Dropcommerce

Worked on e-commerce platform scalability, marketplace integrations, database optimization, API maintenance, and performance improvements.

Meta / John Deere

Worked on global HR system integrations, connecting regional plants and translating local ERP/process data into UKG workforce management formats.


📊 GitHub Stats


📫 Reach Me


Always open to technical conversations, collaborations, and challenging projects — especially around software engineering, integrations, cybersecurity, IoT, automation, infrastructure, and business systems.

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