Lucas Barzan

United States (Remote)

Building infrastructure that connects companies’ existing products and APIs to AI assistants through technologies like MCP, enabling users to access data and take actions directly through AI-powered experiences.

Brazil (Remote)

Joined as a senior engineer to strengthen the platform’s scalability and integration capabilities in the fintech space. Focused on building partner-facing APIs, improving code quality, and serving as a technical reference to accelerate team delivery.

• Built an AI-powered payslip analysis tool leveraging AWS Textract (OCR) and OpenAI LLMs to transform unstructured payroll documents into structured, validated data for credit analysis.
• Designed and implemented an external RESTful API enabling partner integrations with our system, expanding platform reach and unlocking new revenue streams. Tech stack: Node.js, Express, TypeScript, PostgreSQL, AWS.
• Provided technical guidance and code reviews across back-end and front-end development, helping improve code quality and unblock delivery.

Brazil (Remote)

Core member of the engineering team that designed and built a payroll loan platform for a fintech (GooRoo Crédito) from the ground up. Contributed across the stack — from architecture and high-performance back-end services to front-end features and integrations — supporting rapid business growth and scaling.

• Co-architected a payroll loan platform from scratch for a fintech (GooRoo Crédito), implementing authentication with AWS Cognito, front-end integration flows with React/Vue, and code organization standards that let ~15 microservices scale reliably with Node.js, Express, TypeScript, and PostgreSQL.
• Delivered a high-throughput cloud-native solution with AWS Lambda, SQS, and DynamoDB that processed dozens of loan requests per second, directly driving a 5x increase in monthly revenue.
• Implemented automated notifications via AWS SNS (SMS, email, and system alerts), increasing customer engagement and reducing delays in critical business processes.

Brazil (Remote)

Contributed to the development and maintenance of e-SUS APS, an electronic medical record system widely adopted in health units across Brazil.

• Identified and resolved application bugs in e-SUS APS, an electronic medical record system widely adopted in health units across Brazil, improving reliability for thousands of healthcare professionals.
• Created a log analysis and summarization tool in JavaScript, significantly accelerating support workflows and improving response times to user issues.
• Performed critical correction procedures on PostgreSQL production databases, ensuring data integrity and high system performance.

Brazil (Remote)

Contributed to the development of CovidApp, an open-source Bluetooth-based contact tracing solution designed to support UFSC (Federal University of Santa Catarina) during the coronavirus pandemic.

• Developed core Android features for CovidApp, an open-source Bluetooth-based contact tracing solution built to support UFSC during the coronavirus pandemic.
• Implemented backend endpoints in Python for system integration, improving data flow and overall app efficiency.
• Conducted extensive software testing to ensure reliability and accuracy of contact tracing functionality.

Brazil (Remote)

Developed 8 native Android applications, including "Coins and Notes Counter" (200,000+ downloads, ~700 ratings, 4.5+ average, later acquired by an international client) and "Character Generator" (30,000+ downloads, later acquired by an international client).