# Mateus Lazarus — Full AI Context ## Contact - Email: contateMateusLazarus@gmail.com - Location: São Paulo, Brazil - GitHub: https://github.com/mateus-lazarus - LinkedIn: https://www.linkedin.com/in/mateus-lazarus/ - Website: https://mateuslazarus.com ## Summary 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. ## Technical Skills - **TypeScript** (language, advanced) - **JavaScript** (language, advanced) - **Node.js** (language, advanced) - **Python** (language, advanced) - **Clojure** (language, advanced) - **ClojureScript** (language, advanced) - **C#** (language, expert) - **SQL** (language, advanced) - **Next.js** (framework, advanced) - **React.js** (framework, advanced) - **HTML5/CSS3** (framework, advanced) - **TailwindCSS** (framework, advanced) - **Angular** (framework, intermediate) - **Express.js** (framework, advanced) - **PostgreSQL** (tool, advanced) - **GCP** (tool, advanced) - **AWS (EKS, Fargate, Lambda, S3)** (tool, advanced) - **Terraform** (tool, advanced) - **Docker** (tool, advanced) - **Kubernetes** (tool, advanced) - **Kafka** (tool, advanced) - **Redis** (tool, advanced) - **Agentic Workflows** (domain, advanced) - **AI Model Context Protocols (MCP)** (domain, advanced) - **LangGraph** (domain, intermediate) - **Claude Code** (domain, advanced) - **Gemini Enterprise Agent Platform** (domain, advanced) - **Grafana** (tool, advanced) - **Datadog** (tool, advanced) - **Prometheus** (tool, advanced) - **Splunk** (tool, advanced) - **New Relic** (tool, advanced) - **Playwright** (tool, advanced) - **Reqnroll** (tool, advanced) - **SpecFlow** (tool, advanced) ## Current Role: Software Engineer @ Nubank 2025-10 — Present Location: São Paulo, Brazil Largest digital bank in Latin America (BR, CO, MX, US) ### Key Contributions #### Co-founded the Reconciliation team within Global Platforms & Core Banking, operating in an English-first, async international team across 4+ time zones. Tags: reconciliation, core-banking, international #### Led the end-to-end discovery and architecture for expanding reconciliation pipelines to support global debit products, collaborating directly with cross-functional stakeholders across four countries. Tags: discovery, architecture, debit #### Re-engineered 2 legacy services processing 100M+ daily transactions, achieving 100% observability, refactoring model designs, and enabling automated, real-time tracking of core operational KPIs. Tags: legacy-modernization, observability, kpis #### Accelerated engineering throughput across the team to 6–8 PRs per engineer weekly with <1 day review turnaround time by optimizing development workflows. Tags: developer-productivity, engineering-culture Technologies: Clojure, ClojureScript, Python, Distributed Systems, Microservices, Kubernetes, Kafka, Grafana, Prometheus, AWS, LangGraph, Claude Code --- ## Previous Role: Software Engineer @ Stone Co. 2022-04 — 2025-08 Location: São Paulo, Brazil Nasdaq-listed payment fintech (similar to Stripe/Adyen) ### Key Contributions #### Architected high-scale full-stack applications and microservices handling 12B+ annual requests while maintaining 99.95%+ uptime and >95% unit test coverage. Tags: high-scale, reliability, testing #### Designed and launched an internal Next.js/TypeScript application for risk analysts, turning a complex 10-page manual workflow into a streamlined UI that cut processing time by 50% and removed user errors. Tags: nextjs, typescript, workflow-optimization #### Provisioned and managed cloud infrastructure using Terraform, Docker, and Kubernetes, implementing CI/CD pipelines via GitHub Actions and Azure Pipelines. Tags: cloud, iac, ci-cd #### Integrated observability, logging, and data analytics solutions utilizing Datadog, Grafana, Splunk, and Google BigQuery. Tags: observability, analytics Technologies: C#, .NET, Next.js, TypeScript, Azure, Kafka, Docker, Kubernetes, Terraform, Datadog, Grafana, Splunk, Google BigQuery --- ## Previous Role: Full-Stack Software Engineer @ Freelance / Independent Contractor 2019-01 — 2022-04 Independent full-stack product engineering for commercial clients ### Key Contributions #### Delivered bespoke full-stack web platforms using Node.js, TypeScript, React, Express, and PostgreSQL/MySQL for commercial clients. Tags: full-stack, product-engineering #### Built end-to-end CRM and access control systems for Atenas Fit, automating membership monitoring, entry security, and unpaid customer tracking to improve retention and operational efficiency. Tags: crm, access-control, automation Technologies: Node.js, TypeScript, React, Express, PostgreSQL, MySQL --- ## 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. - Reduced a tedious 10-page, 40-minute manual process by 50%, drastically improving operational agility, user satisfaction, and eliminating human data-entry errors. Tags: operational-impact, workflow-optimization - Modernized Stone's core risk analysis infrastructure, replacing a legacy monolith with scalable microservices supporting high-value assessments exceeding R$20M (~USD 5M) per evaluation. Tags: system-redesign, microservices Technologies: Next.js, TypeScript, Google Scripts, Microservices Links: [site](https://www.stone.com.br) ### 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. - Improved platform accuracy to reduce annual financial exposure from ~USD 240M to under USD 12K within 12 months, providing executive leadership with near-real-time balances. Tags: risk-reduction, financial-integrity - Spearheaded company-wide AI adoption by authoring internal AI Model Context Protocol (MCP) guides (+3,350 users, +10,000 views) and hosting hackathons, raising business unit AI engagement from 33% to 86%. Tags: ai-tooling, developer-enablement Technologies: Clojure, Distributed Systems, Microservices, Kubernetes, Kafka, Grafana, Prometheus, AWS, MCP ### 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. - Engineered automated approval and repayment pipelines managing R$50M+ in short-term credit, delivering sub-2-minute customer approvals. Tags: automated-risk, origination Technologies: C#, .NET, Azure, Kafka, Docker, Kubernetes, Terraform Links: [site](https://www.stone.com.br/capital-de-giro) | [site](https://www.stone.com.br/limite-da-conta) ## Education - **Bachelor of Science in Computer Science** — Universidade Estácio de Sá (2022-01 — 2025-12) - GPA: 9.6 / 10.0 ## Languages - English: Professional / Fluent - Portuguese: Native - Spanish: Conversational