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williammacarini/README.md

Hi, I'm William Macarini

Senior Software Engineer specializing in distributed systems, cloud-native architectures, and high-scale backend platforms.

Currently working at Mercado Pago/Mercado Libre, building and evolving fiscal and billing systems that process millions of requests daily and billions of transactions monthly across Latin America.

About Me

  • 💼 Senior Software Engineer with 7+ years of experience
  • 🌎 Building large-scale systems serving Brazil, Chile, and Peru
  • ⚡ Strong background in Microservices, Event-Driven Architecture, and Distributed Systems
  • ☁️ Experienced with Azure, Kubernetes, Docker, Cloud Infrastructure, and Observability
  • 🔥 Passionate about Software Architecture, Performance Optimization, and Scalability
  • 🤖 Exploring AI, LLMs, Agentic Systems, and Software Engineering Automation

🏢 Professional Experience

Senior Software Engineer (Go / .NET)

Mercado Pago / Mercado Libre | Nov 2024 - Present

  • Designing and maintaining fiscal and billing platforms supporting more than 80K sellers
  • Building event-driven systems using Go
  • Improving performance, scalability, and system reliability
  • Leading architectural improvements across a large microservices ecosystem

Software Engineer (.NET)

Ambev Tech | Sep 2020 - Nov 2024

  • Led migration from monolithic architecture to microservices
  • Reduced payment processing time from 45 days to 7 days
  • Developed mission-critical payment and contract systems
  • Worked extensively with PostgreSQL performance optimization and distributed architectures

Support Analyst (L1/L2/L3)

Ambev Tech | Sep 2019 - Sep 2020

IT Support

Grupo Cristina | Feb 2017 - Sep 2019

🛠️ Tech Stack

Languages

  • Go
  • C#
  • .NET Core
  • ASP.NET Core

Architecture

  • Microservices
  • Event-Driven Architecture
  • CQRS
  • Event Sourcing
  • Clean Architecture
  • Hexagonal Architecture
  • Onion Architecture
  • Distributed Systems

Cloud & Infrastructure

  • Azure
  • Kubernetes
  • Docker
  • AWS
  • GCP

Data & Messaging

  • PostgreSQL
  • MySQL
  • Redis
  • Kafka
  • BigQuery

Observability

  • Datadog
  • OpenTelemetry
  • Kibana

🌐 Projects

IP Dev Blog

Personal project focused on Software Engineering, Architecture, Cloud, AI, and Career Growth.

🔗 https://ipdevblog.vercel.app

Built with:

  • Next.js
  • .NET
  • PostgreSQL
  • CI/CD

📫 Contact

📈 GitHub Stats

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