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Senior Software Engineer with 12+ years of experience designing, developing, and scaling robust backend systems and RESTful APIs. Proven ability to integrate LLM capabilities and implement security-by-design principles. Expert in Node.js, TypeScript, and AWS serverless technologies, with a track record of improving system performance and delivering high-impact solutions. Experienced building scalable platforms and driving developer velocity through clean, secure, and reliable engineering practices.…Senior Software Engineer with 12+ years of experience designing, developing, and scaling robust backend systems and RESTful APIs. Proven ability to integrate LLM capabilities and implement security-by-design principles. Expert in Node.js, TypeScript, and AWS serverless technologies, with a track record of improving system performance and delivering high-impact solutions. Experienced building scalable platforms and driving developer velocity through clean, secure, and reliable engineering practices.

Rafael Vascancelos de Medeiros

Full Stack Developer, Back-End Developer, Software Engineer, +2

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Senior Software Engineer with 12+ years of experience designing, developing, and scaling robust backend systems and RESTful APIs. Proven ability to integrate LLM capabilities and implement security-by-design principles. Expert in Node.js, TypeScript, and AWS serverless technologies, with a track record of improving system performance and delivering high-impact solutions. Experienced building scalable platforms and driving developer velocity through clean, secure, and reliable engineering practices.…Senior Software Engineer with 12+ years of experience designing, developing, and scaling robust backend systems and RESTful APIs. Proven ability to integrate LLM capabilities and implement security-by-design principles. Expert in Node.js, TypeScript, and AWS serverless technologies, with a track record of improving system performance and delivering high-impact solutions. Experienced building scalable platforms and driving developer velocity through clean, secure, and reliable engineering practices.

Available to hire

Senior Software Engineer with 12+ years of experience designing, developing, and scaling robust backend systems and RESTful APIs. Proven ability to integrate LLM capabilities and implement security-by-design principles.

Expert in Node.js, TypeScript, and AWS serverless technologies, with a track record of improving system performance and delivering high-impact solutions. Experienced building scalable platforms and driving developer velocity through clean, secure, and reliable engineering practices.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

Portuguese

Fluent

English

Advanced

Spanish; Castilian

Intermediate

Work Experience

Senior Software Engineer at BTG Pactual

August 1, 2023 - February 2, 2026

Integrated LLM capabilities (OpenAI, AWS Bedrock) into internal tools and client-facing features, including intelligent document processing, financial Q&A assistants, and AI-driven data extraction pipelines—reducing manual processing time. Architected secure RESTful APIs using Node.js and TypeScript, following OWASP-aligned practices, implementing OAuth2/JWT authentication, and enforcing robust input validation for critical financial services. Engineered serverless, event-driven solutions using AWS Lambda, API Gateway, AppSync, and S3 to ensure scalable grade-tier financial performance and fault tolerance. Applied security-by-design across the SDLC, including threat modeling, API security reviews, SAST automation, and security gates in CI/CD pipelines.

Senio r S oftw are E ngin eer at BTG P actual

August 1, 2023 - February 2, 2026

Integrated LLM capabilities (OpenAI, AWS Bedrock) into internal tools and client-facing features such as intelligent document processing, financial Q&A assistants, and AI-driven data extraction pipelines, reducing manual processing time. Architected secure RESTful APIs using Node.js and TypeScript, aligning with OWASP practices; implemented OAuth2/JWT authentication and robust input validation for critical financial services. Engineered serverless, event-driven solutions using AWS Lambda, API Gateway, AppSync, and S3 to support scalable and fault-tolerant financial-grade systems. Applied security-by-design throughout the SDLC, including threat modeling, API security reviews, SAST automation, and security gates in CI/CD pipelines. Developed user interfaces with React and React Native for investment and wealth management products. Built financial analytics pipelines for fixed income, investment management, and reporting functions.

Senior Software Engineer at BRQ Digital Solutions (BTG Pactual)

December 1, 2022 - August 1, 2023

Developed scalable web and mobile applications using React, React Native, TypeScript, and Node.js for high-traffic financial products. Designed RESTful and GraphQL APIs to improve system performance and enable reliable service integrations. Used AWS infrastructure components including S3, EC2, and Lambda to improve scalability and security posture. Implemented MongoDB data modeling for complex financial business logic and conducted secure code reviews for the team.

Senio r S oftw are E ngin eer at BRQ Digital Soluções (BTG P actual)

December 1, 2022 - August 1, 2023

Developed scalable web and mobile applications using React, React Native, TypeScript, and Node.js for high-traffic financial products. Designed RESTful and GraphQL APIs that improved system performance and enabled reliable service integrations. Managed AWS infrastructure components including S3, EC2, and Lambda to improve scalability and security posture. Implemented MongoDB data modeling for complex financial business logic and conducted secure code reviews with the team.

Senior Software Engineer & Tech Lead at EY (Ernst & Young)

August 1, 2021 - November 1, 2022

Led cross-functional teams delivering digital transformation initiatives for major clients including Corteva Agriscience, Petrobras, and Enel. Directed team efforts at Corteva Agriscience to enhance agricultural data management and improve crop analysis accuracy on a global scale. Built enterprise-grade RESTful and GraphQL APIs using .NET Core optimized for high-volume data processing. Created cross-platform applications with Angular and Ionic to support field operations. Facilitated code reviews, championed agile practices, and provided mentoring to elevate delivery quality.

Senio r S oftw are E ngin eer & T ech L ead at EY (E rn st & Young)

August 1, 2021 - November 1, 2022

Led cross-functional teams delivering digital transformation initiatives for major clients including Corteva Agriscience, Petrobras, and Enel. Directed the team at Corteva Agriscience to enhance agricultural data management and improve crop analysis accuracy globally. Built enterprise-grade RESTful and GraphQL APIs using .NET Core optimized for high-volume data processing. Created cross-platform applications with Angular and Ionic to support field operations. Facilitated code reviews, promoted agile practices, and provided developer mentoring to raise delivery quality.

Senior Software Engineer at D.S&A DV

January 1, 2019 - August 1, 2021

Developed scalable and maintainable applications using React.js, React Native, Node.js, and TypeScript. Designed RESTful APIs, led functional testing efforts, and established QA standards. Mentored junior developers on clean code principles, best practices, and modern JavaScript/TypeScript patterns.

Senior Software Engineer at D.S & ADV

January 1, 2019 - August 1, 2021

Senio r S oftw are E ngin eer at D.S & AD V

January 1, 2019 - August 1, 2021

Software Engineer at Organização Contábil Bela Cap

August 1, 2015 - January 1, 2019

Engineered web applications for accounting data processing using React.js, Node.js, Vue.js, and Next.js. Developed RESTful APIs to support core accounting workflows and business processes.

Software Engineer at Organização Contábil BelaCap

August 1, 2015 - January 1, 2019

Engineered web applications for accounting data processing leveraging React.js, Node.js, Vue.js, and Next.js. Developed RESTful APIs supporting core accounting workflows and business processes.

S oftw are E ngin eer at Organização Contábil Bela cap

August 1, 2015 - January 1, 2019

Engineered web applications for accounting data processing using React.js, Node.js, Vue.js, and Next.js. Developed RESTful APIs to support core accounting workflows and business processes.

NET Developer at Somat Contadores, Stone Pagamentos, S&A Ferreira Imobiliária

January 1, 2014 - January 1, 2015

Used C#, VB.NET, .NET MVC 5, and SQL Server for development across financial, payments, and real estate domains. Designed RESTful APIs, implemented backend logic, and performed functional testing.

.NET Developer at Somat Contadores, Stone Pagamentos, & S&A Ferreira Imobiliária

January 1, 2014 - January 1, 2015

Used C#, VB.NET, .NET MVC 5, and SQL Server to develop backend logic. Designed RESTful APIs, implemented backend logic, and performed functional testing across financial, payments, and real estate sectors.

.NET D eve lo per at Somat C onta dore s, S to ne P agam ento s, S á & F erre ir a Im obiliá ria

January 1, 2014 - January 1, 2015

Used C#, VB.NET, .NET MVC 5, and SQL Server for development. Designed RESTful APIs, implemented backend logic, and performed functional testing across financial, payments, and real estate sectors.