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Gustavo Peterlini

@gustavopeterlini

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Backend .NET Developer at PPLTECH who replaced manual quote checks with automated LME pricing updates.

Brazil

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At PPLTECH, I developed a raw-materials module that replaced manual quote checks across websites with automated London Metal Exchange API updates and analytical pricing calculations. I also migrated and maintained legacy systems to .NET 9.

I built an end-to-end corporate training platform on a .NET 9 API and integrated digital-signature workflows into the central HR system, replacing paper-based onboarding. My work also includes SQL Server and PostgreSQL queries, stored procedures, and performance tuning.

Previously, at Termomecanica, I built .NET backend APIs for Flutter safety-dialog and environmental-inspection apps used across four factories, and developed a B2B platform for commercial transactions and partner-data integration. I also maintained SAP and Salesforce CRM integrations.

Experience

Work history, roles, and key accomplishments

Current

Backend .NET Developer

Current

PPLTECH

Jan 2024 - Present (2 years 9 months)

Developed backend systems and APIs in C#/.NET, including a raw-materials module with LME API integration, migrated legacy systems to .NET 9, and built a corporate training platform. Wrote SQL queries and stored procedures for SQL Server and PostgreSQL.

C#.NET9 ASP.NET Core SQL Server PostgreSQL T SQL Stored Procedures Query Tuning REST APIs Entity Framework Core LINQ xUnit Azure DevOps GitHub Actions Docker Kubernetes LME APIs Digital Signatures Legacy Migration

Backend .NET Developer

TIVIT

Oct 2024 - Mar 2025 (5 months)

Connected React.js frontends to .NET 9 REST APIs for real-time data synchronization, optimized PostgreSQL queries for a SaaS workflow platform, and wrote xUnit test suites to support system reliability.

C#.NET9 ASP.NET Core REST APIs PostgreSQL React xUnit Real time Data Synchronization

Backend .NET Developer

Termomecanica

Feb 2022 - Jan 2024 (1 year 11 months)

Built .NET backend APIs for Flutter safety and environmental inspection apps used by 700 users across 4 factories, developed a B2B platform supporting commercial transactions for over 5,000 clients, and maintained core systems and SAP/Salesforce integrations.