Evandro Castro

Fullstack Software Engineer with 5+ years of experience building and shipping production systems across checkout platforms, supply chain logistics, and large-scale video streaming. Backend-focused with strong command of Python (FastAPI, Flask, Django), AWS, and distributed systems, and I’m comfortable across the full stack with React and TypeScript in remote-first, async-driven environments.

At 3S Checkout, I’m developing and evolving the delivery module for a checkout platform processing 1.5M+ orders/month, focusing on scalability, reliability, and observability. I’ve implemented integrations with external delivery partners using the OpenDelivery standard, enabling communication with iFood, 99Food, and third-party providers, while collaborating async with teams through written specs, API contracts, and integration flows.

At ACT Digital (Raízen Project), I developed and maintained a high-performance supply chain platform coordinating a fleet of ~9,000 fuel transport trucks across Brazil. I refactored legacy backend services to FastAPI to improve API performance and reduce maintenance complexity, and I led security remediation efforts that eliminated ~95% of reported vulnerabilities using Veracode and Dependabot.

Previously at Eventials, I helped build large-scale video streaming infrastructure supporting 5,000+ concurrent viewers using WebRTC and AWS services, then led migration to serverless architectures with AWS Lambda and EventBridge. I also designed APIs, webhooks, and message-based integrations with Redis, automated reporting and data workflows using Apache Airflow and SQL, and actively building skills in agentic AI development with LLM-based workflows and AI coding tools.