Willian Caetano
@williancaetano
Software engineer specializing in backend systems and GenAI-driven legacy modernization.
BrazilWhat I'm looking for
I am a software engineer with a B.S. in Statistics who bridges deterministic backend engineering and probabilistic GenAI systems, focusing on Golang and Java for enterprise-grade solutions.
I've built high-scale Golang microservices sustaining 99.99% uptime, engineered AI agents and multi-model gateways to modernize legacy monoliths, and improved LLM-driven refactoring accuracy and developer productivity.
I combine applied statistics, distributed systems experience, and cloud-native practices (AWS, Docker, Kubernetes, CI/CD) to deliver scalable, data-informed systems that reduce latency and accelerate delivery.
Experience
Work history, roles, and key accomplishments
Software Engineer
Capco
May 2025 - Present (1 year 1 month)
Engineered GenAI-driven legacy modernization tools using Spring AI and Java 21, automating monolith decomposition and reducing manual code analysis time by ~40%; implemented a multi-model gateway to route LLM calls for cost/latency optimization.
Software Engineer
Mercado Livre
Oct 2022 - Aug 2024 (1 year 10 months)
Developed core logistics microservices in Golang processing 3M+ daily packages with 99.99% uptime; refactored APIs to reduce data retrieval latency by 25% and optimized CI/CD pipelines to cut build times by 30%.
Financial & Business Specialist
Itaú Unibanco
Apr 2010 - Aug 2022 (12 years 4 months)
Managed high-value client portfolios and streamlined financing contract processes in a regulated environment, leveraging quantitative analysis to ensure enterprise readiness and compliance.
Education
Degrees, certifications, and relevant coursework
Universidade Federal de Goiás
Bachelor of Science, Statistics
2013 - 2020
Completed a Bachelor of Science in Statistics, providing a quantitative foundation applied to backend engineering and AI system optimization.
Tech stack
Software and tools used professionally
Availability
Location
BrazilAuthorized to work in
Job categories
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