# Mateus Lazarus

> Senior Full-Stack Product Engineer — With over 6 years of software engineering experience, I specialize in operating within highly regulated, high-stakes markets where technical reliability directly intersects with core business strategy. I operate with high agency—owning initiatives end-to-end from strategic planning and domain discovery to technical execution and post-implementation metrics.

## Core Technical Profile
- language: TypeScript (advanced)
- language: JavaScript (advanced)
- language: Node.js (advanced)
- language: Python (advanced)
- language: Clojure (advanced)
- language: ClojureScript (advanced)
- language: C# (expert)
- language: SQL (advanced)
- framework: Next.js (advanced)
- framework: React.js (advanced)
- framework: HTML5/CSS3 (advanced)
- framework: TailwindCSS (advanced)
- framework: Angular (intermediate)
- framework: Express.js (advanced)
- tool: PostgreSQL (advanced)
- tool: GCP (advanced)
- tool: AWS (EKS, Fargate, Lambda, S3) (advanced)
- tool: Terraform (advanced)
- tool: Docker (advanced)
- tool: Kubernetes (advanced)
- tool: Kafka (advanced)
- tool: Redis (advanced)
- domain: Agentic Workflows (advanced)
- domain: AI Model Context Protocols (MCP) (advanced)
- domain: LangGraph (intermediate)
- domain: Claude Code (advanced)
- domain: Gemini Enterprise Agent Platform (advanced)
- tool: Grafana (advanced)
- tool: Datadog (advanced)
- tool: Prometheus (advanced)
- tool: Splunk (advanced)
- tool: New Relic (advanced)
- tool: Playwright (advanced)
- tool: Reqnroll (advanced)
- tool: SpecFlow (advanced)

## Canonical Resources
- [Full CV Data](/resume.json): Machine-readable JSON Resume standard.
- [Full LLM Context](/llms-full.txt): Detailed breakdown of experience, projects, and engineering decisions.
- [GitHub](https://github.com/mateus-lazarus): Source code and open-source contributions.

## Key Career Highlights
- **Nubank** (Software Engineer): Co-founded the Reconciliation team within Global Platforms & Core Banking, operating in an English-first, async international team across 4+ time zones.
- **Stone Co.** (Software Engineer): Architected high-scale full-stack applications and microservices handling 12B+ annual requests while maintaining 99.95%+ uptime and >95% unit test coverage.
- **Freelance / Independent Contractor** (Full-Stack Software Engineer): Delivered bespoke full-stack web platforms using Node.js, TypeScript, React, Express, and PostgreSQL/MySQL for commercial clients.

## Featured Projects
- **Specialized Risk & Credit Analysis Platform**: Led and built an internal web platform for risk analysts using Next.js, TypeScript, and Google Scripts to streamline complex business registration and risk assessment workflows.
- **Global Core Reconciliation & Operations Platform**: Architected and scaled the global reconciliation platform governing Mastercard clearing, settlement, chargebacks, and fee collections across BR, CO, MX, and US, processing 100M+ customer transactions daily.
- **Credit Product Platform & Short-Term Credit**: Built and scaled core credit systems from scratch to R$1B+ in portfolio value, increasing capacity from 10K to 1M+ requests per day while maintaining 99.95%+ uptime.