Leo Pepinelli ☕ | Senior Software Engineer focused on backend architecture, cloud infrastructure, and distributed systems.

pepinelli@dev: ~
Leo Pepinelli ☕

About

Senior Software Engineer with experience building backend systems, cloud infrastructure, and distributed applications. I enjoy designing scalable architectures, improving developer experience, and solving complex technical problems with simple, maintainable solutions.

My primary stack is .NET, Node.js, TypeScript, and AWS, with hands-on experience in microservices, event-driven systems, Infrastructure as Code, and data engineering pipelines.

Outside of work, I enjoy building side projects, exploring new technologies, and continuously refining my engineering craft, usually with a fresh cup of coffee in hand.

Work Experience

Cox Automotive Brasil

Cox Automotive Brasil

Full-timeRemote2 yrs 3 mos

Senior Software Engineer

Dec 2025 - Present · 9 mos
  • I work on developing scalable backend and cloud solutions using .NET, Node.js, and AWS. I contribute to enterprise applications, working with microservices and event-driven architectures, applying concepts such as DDD, CQRS, and SOLID.
  • I also collaborate on cloud infrastructure provisioning using AWS services, adopting Infrastructure as Code (IaC) practices with Terraform, monitoring environments, and proposing cost optimization initiatives.
Amazon Web Services (AWS)Systems Design.NETNode.jsTypeScriptServerlessMicroservicesTerraform

Software Engineer

Jul 2024 - Dec 2025 · 1 yr 6 mos
Domain-Driven Design (DDD).NET FrameworkNode.jsTypeScriptAWSCQRSSOLID
Matsuda Group

Matsuda Group

Full-timeOn-site8 yrs 9 mos

Software Development Analyst

Jan 2021 - Jul 2024 · 3 yrs 7 mos
  • Developed a digital land reservation system with a property model integrated with TOTVS RM ERP, improving productivity, security, and UX for 300+ users.
  • Designed and implemented a Node.js REST API with PostgreSQL and Prisma ORM, added real-time features with Socket.io, and ensured reliability with automated tests using Jest.
  • Built an integration with TOTVS RM ERP using Pentaho for ETL pipelines, and developed internal reporting tools with C# .NET CORE and T-SQL.
  • Built a React + TypeScript application with Ant Design components. Deployed using Docker containers, Terraform for IaC, and AWS for hosting.
ReactTypeScriptAnt DesignNode.jsPrisma ORMPostgreSQLDockerSocket.ioPentahoC# .NET CORET-SQLTerraformAWSJestPWA

ERP Administrator / SysAdmin

Jan 2017 - Jan 2021 · 4 yrs 1 mo
  • Managed the TOTVS RM ERP system, identifying and resolving problems in the modules related to Real Estate Development, Finance, and Accounting. Administered MSSQL databases and handled data integrity, backups, and performance tuning.
TOTVS RMMSSQLERP AdministrationDatabase Administration

Help Desk & Support

Jan 2016 - Jan 2017 · 1 yr 1 mo
  • Provided IT support to end users. Troubleshot hardware, software, and network issues. Handled user onboarding and system access management.
IT SupportHelp DeskTroubleshooting

Education

Unoeste

Unoeste

2021
Bachelor's degree, Information Systems
AlgorithmsData StructuresWeb DevelopmentSoftware EngineeringDatabasesOperating SystemsComputer NetworksArtificial IntelligenceMobile DevelopmentProject Management

Skills

Languages

TypeScriptC#JavaScriptPythonSQL

Backend

Node.js.NETExpressREST APIsWebSocketsAuthentication (JWT/OAuth) & Authorization

Cloud / DevOps

AWSDockerTerraformLinuxCI/CDServerless

Databases

PostgreSQLSQL ServerDynamoDBMongoDBPrisma ORMEntity Framework

Architecture & Practices

System DesignMicroservicesEvent-Driven ArchitectureDomain-Driven Design (DDD)Command Query Responsibility Segregation (CQRS)SOLIDClean ArchitectureAgile / SAFe

Frontend

ReactTailwindCSSstyled-componentsHTML5/CSS3Ant Design

Data Engineering

ETLPySparkParquetData PipelinesFeature EngineeringMedallion Architecture

Testing

Unit TestsIntegration TestsJestxUnit