Open to opportunities

Lucas Duarte

@lucasduarte1

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Senior full-stack engineer who owns end-to-end payment and AI-enabled engineering systems at scale.

Brazil

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What I'm looking for

I’m looking to keep owning end-to-end, business-critical systems—especially payments—while building reliable, scalable products. I want to bring AI/agentic engineering workflows into production and grow teams through mentoring and architecture leadership.

I’m a Senior Full-Stack Engineer with 7+ years building scalable web applications and payment platforms. I own end-to-end the payment, transfer and credit flows of the Mercado Pago mobile app (iOS & Android), covering feature delivery, observability, deploys, and reliability for millions of users across Latin America.

Over 5 years at Mercado Livre, I delivered mission-critical products for Mercado Pago, including leading an internal checkout library (SSR + Backend-for-Frontend) and spearheading the Node.js SDK V2 redesign from architecture and RFCs to release. I also built Secure Fields, a PCI-compliant product that isolates and transmits sensitive card data only through approved channels, and I maintained a JavaScript SDK integrated by thousands of developers.

I drive technical and architectural decisions, lead hiring and interviews, and mentor new engineers. I’ve also applied AI and agentic systems in production—grounding workflows in how LLMs and agents work by designing custom MCPs, agent skills and subagents using Claude Code and Cursor.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Mercado Livre

Jan 2023 - Present (3 years 6 months)

Owned end-to-end payment, transfer, and credit flows for the Mercado Pago mobile app (iOS/Android), covering feature delivery, observability, deployments, and reliability for millions of users across Latin America. Led a reusable checkout library (SSR + BFF), built the Node.js SDK V2 and the PCI-compliant Secure Fields product, and mentored engineers while driving key architecture decisions.

Backend For Frontend (BFF)Payment Systems PCI Compliance REST APIs SDK Development Observability Reliability Engineering Architecture Technical Leadership

Software Engineer

Mercado Livre

Jul 2021 - Dec 2022 (1 year 5 months)

Built and maintained SSR applications with React and Node.js supporting high traffic volumes. Improved the integrator experience through SDKs and debugged Node and React performance issues.

React SDK Development Debugging Performance

Front-end Developer (React.js)

Hexagon Manufacturing Intelligence

Dec 2019 - Jun 2021 (1 year 6 months)

Developed interfaces with React.js and TypeScript based on high-fidelity designs and tested with Jest. Worked with a .NET backend and Docker, Redis, and MySQL, and contributed to CI/CD pipelines on Azure DevOps.