Open to opportunities

Lucas Garcia

@lucasgarcia1

Message

Senior backend engineer building reliable C#/.NET and Java systems with LLM-powered features.

Brazil

Message

What I'm looking for

I’m open to remote full-time or contractor (B2B) roles with international teams, focused on building reliable backend services in .NET/Java and integrating LLM capabilities (RAG/agents) that meet SLAs and compliance.

I’m a backend engineer with 6 years of experience building systems where reliability isn’t optional. Today I work at Serasa Experian, building high-throughput C#/.NET and Java/Spring Boot APIs and microservices that can affect real business outcomes, and I apply SOLID, Clean Architecture, and DDD where they pay off—so the systems keep scaling.

I also bring LLMs into AWS Cloud, delivering RAG pipelines and agentic workflows (with LLM orchestration) that integrate with legacy .NET/Java stacks while meeting SLAs, compliance, and real data constraints. Across roles, I’ve architected enterprise services, led implementations using SCRUM/Agile, optimized SQL Server and data operations, mentored junior engineers, and containerized systems with Docker/Kubernetes—while currently completing a Postgraduate degree in AI Engineering.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer II

Current

Serasa Experian

Oct 2025 - Present (10 months)

Builds high-throughput backend services and APIs using C#/.NET and Java/Spring Boot, including microservices handling high request volume. Works on integrating LLMs for RAG and agentic workflows in cloud environments and mentors teams on reliable architecture.

C#.NET Core Java Spring Boot Microservices API Development SOLID Clean Architecture RAG AI Agents AWS Azure Performance Engineering

Software Engineer (Backend — .NET)

Foursys

Nov 2023 - Oct 2025 (1 year 11 months)

Architected and developed scalable services and APIs using C# and .NET Core, supporting high-traffic enterprise platforms. Led Scrum-based task management in Jira, optimized SQL Server operations, and mentored junior developers through code reviews.

C#.NET Core APIs Scrum Jira SQL Server Database Optimization Code Review Mentor

Backend Engineer (Node.js / TypeScript)

Kruzer

Jul 2023 - Sep 2023 (2 months)

Delivered RESTful APIs and system integrations using TypeScript/Node.js, integrating SQL Server and MongoDB data layers. Containerized services with Docker/Kubernetes to enable CI/CD pipelines for continuous deployment.

Node TypeScript REST APIs SQL Server MongoDB Docker Kubernetes CI CD Systems Integrations

Software Engineer (Node.js Backend)

Semantix

Aug 2021 - Jun 2023 (1 year 10 months)

Designed and developed Node.js backend applications for enterprise clients and applied SOLID and Clean Architecture for maintainable services. Optimized SQL Server operations, reducing legacy query execution time substantially for clients.

Node SOLID Clean Architecture SQL Server Query Optimization Backend Development

Software Engineering Intern

Work Doc Gestão Documental

Dec 2019 - Aug 2021 (1 year 8 months)

Refactored legacy modules (Classic ASP to a modern stack) to improve performance of a document management system processing high document throughput. Developed Java features, optimized SQL Server queries, and built data pipelines using BigQuery and AWS S3.

Classic ASP Java SQL Server BigQuery S3 Data Pipelines Refactoring Performance Optimization