Open to opportunities

willian User

@willianuser1

Senior Software Engineer with 9+ years of experience building scalable, high-performance applications across healthcare, govtech, and B2B platforms.

Brazil

Message

What I'm looking for

I’m looking for a fully remote opportunity where I can contribute as a Senior Software Engineer, working on challenging backend and full-stack systems with technologies such as PHP/Laravel, TypeScript, Python, AWS, and modern architectures. I value an international environment, technical challenges, opportunities to contribute to architecture and technical decisions.

Senior Software Engineer with 9+ years of experience building scalable, high-performance applications across healthcare, govtech, and B2B platforms. Experienced in PHP/Laravel, JavaScript/TypeScript, Node.js, NestJS, Python, SQL, Redis, AWS, MVC, and Hexagonal Architecture. Recently developed a LLM application using RAG, FastAPI, LangChain, Qdrant, LangSmith, and OpenRouter, combining semantic search with contextual AI responses. Strong background in system scalability, performance optimization, and maintainable software architecture.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Dendrix

Dec 2023 - Present (2 years 10 months)

• Designed and developed a modular payment processing service using NestJS, TypeScript, Docker, and Hexagonal Architecture (Ports &
Adapters), integrating Stripe and Pagar.me, with GitLab CI/CD and Jest unit/E2E testing, enabling flexible payment provider switching
and international payment.
• Deployed and managed containerized applications in Kubernetes, working with Pods, Deployments, Services.

PHP Laravel Vue.Js Redis PostgreSQL TypeScript

Software Engineer PHP

Engesoftware

Sep 2022 - Dec 2023 (1 year 3 months)

Developed a web platform for government bidding in the industrial sector, streamlining company registration and bid management. Improved bidding speed by 50% and reduced in-person bureaucracy.

PHP Laravel Vue.Js MySQL TypeScript React

Software Engineer Java

State Department of Justice

Jul 2021 - Nov 2022 (1 year 4 months)

Contributed to a government platform calculating the Vulnerability Index for Paraná citizens, improving data models and increasing assessment efficiency by 30%. Refactored a system with approximately 50 redundant files into a single reusable filter.

Java SQL Server JSF PrimeFaces

Software Engineer PHP

Orbital Technology

Jun 2019 - Oct 2022 (3 years 4 months)

Developed a food delivery system with event-driven architecture, payments, KDS, and delivery logistics, used by 38 locations across 22 cities. Implemented a microservice chatbot integrated with AI as an AWS Lambda function.