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Guilherme Santos

@guilhermesantos4

Message

I build scalable Java backend platforms, cloud-native microservices, and high-performance serverless systems.

Brazil

Message

What I'm looking for

I'm looking to build scalable backend, distributed, and cloud-native systems where I can lead modernization, improve performance and reliability, and deliver high-impact solutions with business and product teams.

I've built backend platforms at NewFold, JBS, Tuiuiu Pesca, and Filaqui using Java, Spring Boot, AWS, and microservices. At NewFold, I develop Storefront services and AI agent integrations using Python and Model Context Protocol.

At JBS, I led a Python monolith migration to distributed Java microservices and AWS serverless architecture, supporting 5,000+ active users across 500+ stores. I reduced Java AWS Lambda cold starts from about 8 seconds to under 1 second with GraalVM and Java AOT, and I enjoy turning operational problems into scalable, business-focused products.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer

Current

NewFold

Jun 2026 - Present (3 months)

Develop and maintain backend services for the Storefront platform using Java and Spring Boot, supporting customer-facing features. Work with Oracle Cloud Infrastructure, Oracle Database, and RabbitMQ, and develop AI agent solutions using Python and Model Context Protocol.

Java Spring Boot Python OCI Oracle Database RabbitMQ Jenkins MCP AI Agents REST APIs Microservices Docker SQL

Software Engineer

JBS

Feb 2025 - May 2026 (1 year 3 months)

Led migration of a Python monolith to distributed microservices and serverless architecture using Java, Spring Boot, AWS Lambda, API Gateway, Cognito, and MySQL. Optimized serverless Java performance with GraalVM and Java AOT, reducing Lambda cold starts from ~8 seconds to under 1 second, and implemented CI/CD pipelines with AWS SAM.

Java Spring Boot AWS Kubernetes Kafka MySQL Domain Driven Design Test Driven Development Clean Architecture Microservices Docker Hibernate SQL CI CD

Software Engineer

Tuiuiu Pesca

Jan 2020 - Feb 2025 (5 years 1 month)

Designed and developed a scalable product management platform using Java, Spring Boot, Angular, MySQL, and Elasticsearch. Built AI-assisted content generation features using OpenAI APIs and developed dynamic product registration workflows with intelligent validation rules.

Java Spring Boot AWS Kubernetes MySQL Elasticsearch Redis Angular Domain Driven Design Test Driven Development Clean Architecture Docker Hibernate SQL CI CD Python TypeScript

Software Engineer

Filaqui

Jan 2019 - Jan 2020 (1 year)

Co-developed and validated a startup platform for real-time queue management services using Angular, MongoDB Atlas, Firebase, and Google Cloud Platform. Rapidly built and iterated MVP features based on customer feedback, generating the startup's first sales during live events.

TypeScript MongoDB Microservices Firebase GCP Angular Functional Programming