Fernando Callata

Owns backend architecture and coding standards for an enterprise payroll platform, serving as tech lead for two engineering teams. Designs and deploys ASP.NET Core microservices processing 100,000+ requests per hour, and implements Redis caching and API rate limiting.

Built an e-commerce platform from scratch as full-stack engineer on a microservices architecture. Reduced failure rates in critical logistics integrations by introducing service-level telemetry.

Delivered ASP.NET Core REST APIs and front-end features end-to-end for energy-sector products covering consumer units, contracts, and solar energy migration.

Rebuilt legacy ASP.NET WebForms screens as design-system-compliant Vue components on an AWS-hosted platform, and refactored the legacy .NET services behind them.

Shipped end-to-end features from Node.js APIs to React UIs on AWS in fast iteration cycles for new business verticals.

Designed a production-grade internationalization framework in .NET, contributing to a 25% revenue increase in Portuguese- and Spanish-speaking markets. Standardized local development environments with Docker, cutting setup time by approximately 70%.

Engineered a high-volume payment pipeline in C#/.NET on AWS, achieving zero transaction failure rate and full data integrity. Designed and owned a centralized AES-256 encryption service satisfying PCI-DSS compliance, and instrumented service health with Datadog and CloudWatch.

Led a squad owning three .NET Core microservices in an event-driven architecture, reducing production incidents. Resolved critical system instability and defined code review and engineering standards across teams.

Executed a zero-downtime migration of legacy Visual Basic payroll systems to modern C#/.NET. Designed integration patterns bridging modern services with legacy .NET Framework infrastructure, and built backend features for the Employee Self Service platform.

Bachelor of Software Engineering degree from the Federal University of Goiás, completed in 2021.