Open to opportunities

Denis Magalhães

@denismagalhes

Message

I build AI-powered grading products, browser extensions, and scalable full-stack platforms.

Brazil

Message

What I'm looking for

I'm looking to build AI-powered products and reliable full-stack systems where I can own work end to end, improve real user workflows, and use observability and AI tooling to solve root causes.

At CoGrader, I build an AI grading and feedback platform that helps K-12 teachers grade essay sets in minutes rather than a weekend. I own the product end to end, from LLM grading pipelines and Node.js services to React applications, queue workers, Firestore, observability, and cloud infrastructure.

I built CoGrader's browser extension for Canvas, Blackboard, Schoology, Brightspace, Microsoft Teams for Education, and Google Classroom, removing dependency on lengthy LMS partner integrations. This removed a funnel bottleneck, raised conversion, and opened access to schools and districts that would otherwise be blocked.

I've also founded and led GoatVPN, led credit-emission engineering at Grafeno Digital, owned authentication and permissions for Itaú BBA's corporate Bankline, and delivered payment, banking, and integration systems at Trustly, Itaú Unibanco, Accenture, and QueroQuitar. I work across Gemini, OpenAI, Anthropic, React, TypeScript, Node.js, Python, cloud infrastructure, observability, and AI-assisted engineering workflows.

Experience

Work history, roles, and key accomplishments

Current

Founding AI Full-Stack Engineer

Current

CoGrader

Jan 2025 - Present (1 year 7 months)

As a founding engineer, built CoGrader's AI grading and feedback platform, helping teachers grade essays in minutes. Owned features end to end, including a browser extension that integrates with major LMS platforms.