Open to opportunities

Mateus Santos

@mateussantos

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Lead Software Engineer specializing in distributed, event-driven platforms for high-compliance systems.

Brazil

Message

What I'm looking for

I’m looking for a role where I can lead engineering delivery, design event-driven distributed systems, and keep compliance and SLAs rock-solid. I want ownership, strong product collaboration, and opportunities to modernize platforms with measurable impact.

I’m a Lead Software Engineer and Technical Leader with 5+ years of experience building and evolving backend systems across financial services, taxation, logistics, and retail. I focus on turning complex, regulation-driven requirements into reliable software that keeps teams shipping.

At GFT Group (Serasa Experian), I currently lead a team of 9 under Scrum/Kanban, delivering Brazilian tax reform compliance features on a complex roadmap. I drive technical ownership of an invoice processing platform, ensuring 100% compliance continuity while evolving architecture as new regulatory requirements are progressively introduced—and I’ve delivered a pipeline redesign that cut processing time by 45%.

Previously as a Senior Software Engineer, I designed distributed, event-driven invoice processing using AWS SQS dispatch into serverless listeners (Lambda + API Gateway). I also built a DynamoDB logging layer for auditability and analytical reporting, then created an automated invoice reprocessing solution with state-change detection and error handling to improve SLA compliance for hundreds of thousands of clients.

Beyond tax platforms, I build high-scale solutions end-to-end: migrating a legacy ASP.NET monolith to PHP/Laravel + Next.js/React, designing multi-tenant backend routing and tenant isolation, and modernizing mobile experiences with React Native (Expo). I bring engineering rigor from financial pipelines built with HPCC Systems (Roxie) and ECL to TDD practices that reached ~95% test coverage, supporting teams with strong quality, maintainability, and operational visibility.

Experience

Work history, roles, and key accomplishments

Current

Lead Software Engineer

Current

GFT Group

Mar 2026 - Present (4 months)

Led a Scrum/Kanban team delivering Brazilian tax reform compliance features for a client-focused invoice processing platform roadmap. Took technical ownership of invoice processing platform evolution to support new regulatory requirements, and mentored junior engineers while translating regulatory needs into technical solutions through discovery to deployment.

Scrum Kanban Team Leadership Regulatory Compliance Pair Programming Mentoring

Current

Senior Software Engineer

Current

Freight Classifieds Platform

Aug 2025 - Present (11 months)

Led the migration of a legacy ASP.NET monolith to PHP/Laravel with Next.js/React, including MongoDB-to-PostgreSQL, to enable new platform features. Built a multi-tenant backend design, migrated a mobile app from Apache Cordova to React Native (Expo), and implemented role-specific operational dashboards.

ASP.NET PHP Laravel Next.js React MongoDB PostgreSQL Tenant Isolation Apache Cordova React Native Role Based Dashboards

Senior Software Engineer

GFT Group

Aug 2025 - Mar 2026 (7 months)

Developed backend microservices in Java and Spring to implement Brazilian tax reform rules across the invoice emission pipeline. Designed an event-driven AWS SQS/Lambda/API Gateway processing pipeline with DynamoDB logging and automated invoice reprocessing, reducing processing time by 45% and improving SLA compliance.

Spring Framework Maven Microservices Event Driven Architecture SQS AWS Lambda API Gateway DynamoDB Angular Automated Reprocessing State Change Detection Error Handling REST APIs

Software Engineer

Gazin Tech

Jul 2024 - Jul 2025 (1 year)

Developed and maintained financial platforms processing hundreds of thousands of fiscal documents daily, supporting the end-to-end invoice billing lifecycle across PHP/Laravel services and legacy .NET systems using PostgreSQL. Built supplier financing and early-payment solutions with Apache Kafka, and established TDD and automated testing pipelines to improve coverage and reduce defects.

PHP (Laravel).NET PostgreSQL Apache Kafka TDD Automated Testing Test Coverage Clean Architecture DDD SLA Management

Software Engineer

Transvale Transportes

Mar 2024 - Jul 2025 (1 year 4 months)

Developed and maintained an internal web platform for logistics operations using .NET/ASP.NET 7, MongoDB, and Razor Pages with jQuery/Bootstrap. Built an internal HR tool to manage job openings and candidate applications, and initiated an internal financial management system to track operational costs and consumable purchases.

MongoDB Razor Pages jQuery Bootstrap

Software Engineer

QUOD — Credit & Fraud Intelligence

Jan 2022 - Mar 2024 (2 years 2 months)

Built data pipelines using ECL on HPCC Systems (Roxie) to process terabytes of raw financial data into fraud and credit risk signals consumed by downstream services. Collaborated on fraud detection rule design and implementation to reduce false positives and improve credit risk assessment accuracy.

HPCC Systems (Roxie)Data Pipelines Fraud Detection Credit Risk Assessment

Software Engineer

B5S Tecnologia

Feb 2021 - Dec 2021 (10 months)

Contributed to modernization of a banking back-office platform using PHP/Slim, implementing features for internal management workflows and customer self-service terminals. Built and maintained a cinema management system (ATM) in Java with Spring Framework and developed full-stack features using PHP/Slim, Angular, and MariaDB across banking and entertainment domains.

Java 8 Spring Framework Angular MariaDB Full Stack