Hello, I amRennan

Freight & logistics — one of Brazil's largest trucking/logistics companies, ~$500M USD annual revenue, 9,000+ employees, 15 cargo transfer hubs nationwide.

• Redesigned a critical manual workflow into an automated .NET (C#) process, cutting execution time from ~35 minutes to 3 minutes (-90%) across 300+ branches
• Streamlined API delivery with CI/CD pipelines (Jenkins on Rancher), replacing a 30-minute manual deploy with a 1-minute deploy (-97%)
• Led the adoption of an LLM + RAG-based intelligent assistant for internal documentation, reducing the time employees spend searching for information
• Led the migration of legacy Windows Forms screens to Angular, running both stacks in parallel to guarantee business continuity
• Decomposed a monolith into event-driven services using RabbitMQ and implemented structured observability with Application Insights, reducing production incident diagnosis time

• Helped architect the product from the ground up using Angular, .NET (C#) and PostgreSQL, covering requirements extraction, data pipeline design and product architecture
• Applied Clean Architecture and TDD principles from the project inception, ensuring a testable, decoupled and scalable codebase
• Drove MVP development from concept to a fully functional, market-ready product, working cross-functionally between product design and engineering

• Redesigned restaurant management workflows into a full-stack web application using React and .NET (C#), enabling real-time menu control, staff management and role-based permissioning
• Built a granular access control system supporting multiple staff roles, reducing operational errors related to unauthorized actions
• Delivered end-to-end solutions independently, from requirements gathering through deployment, using PostgreSQL as the primary database