Matheus Lima

Staff Software Engineer

Architecting high-performance systems that combat fraud and financial crime.

About

Driven by a lifelong curiosity about complex systems — from the mechanics of the cosmos to the evolution of human history — I found my true calling in Software Engineering. To me, code is the ultimate tool for understanding and solving the challenges of the modern world.

Currently, as a Staff Software Engineer at WEX, I specialize in the FinTech sector, architecting high-performance systems that combat fraud and financial crime. I thrive in high-stakes environments, managing microservices that process millions of monthly requests to ensure global business security.

My philosophy is simple: I am a problem-solver first and a coder second. Whether I am designing a resilient data pipeline, implementing an LLM-driven automation, or building a full-stack solution from the ground up, my focus remains on the tangible impact technology has on people's lives and business growth.

Core Expertise

•Backend & Architecture: Java (Spring Boot), Microservices, gRPC, Kafka.
•Data & AI: Python, Snowflake, ETL Pipelines, Generative AI integration.
•Cloud Infrastructure: AWS, GCP, Azure, Docker, CI/CD.

Skills

Backend & Architecture

JavaSpring BootgRPCKafkaMicroservicesDomain-Driven DesignEvent-Driven ArchitectureSystem DesignNode.jsNest.jsRESTful APIsAPI Gateway

Data & AI

PythonSnowflakeApache AirflowETL PipelinesData EngineeringBigQueryLLMMachine LearningStreamlitSupersetBusiness Intelligence

Cloud & DevOps

AWSGCPAzureDockerKubernetesCI/CDDevOpsGrafanaPrometheusOpenTelemetry

Frontend

TypeScriptReactNext.jsAngularJavaScript

Practices

Test-Driven DevelopmentFull-Stack LeadershipProcess AutomationAI IntegrationCross-Functional StrategyProject ManagementTeam Building

Experience

Wex

Staff Software Engineer

06/2024 - present

•System Scalability: Architected high-availability microservices processing millions of daily requests for real-time fraud decisioning and transaction flagging.
•Performance Engineering: Optimized the microservice chain by building persistent TCP connections via Java and Spring Boot, significantly reducing latency for external system handshakes.
•Backend Architecture: Developed gRPC and HTTP endpoints for cross-team integration and implemented Apache Kafka for asynchronous, event-driven processing.
•Data Engineering: Orchestrated ETL pipelines using Python, Snowflake, and Apache Airflow to migrate large-scale datasets across Amazon S3 and third-party vendors.
•Business Intelligence: Delivered automated reporting tools and dashboards using Streamlit and Superset, providing critical data visualization for leadership and Data Science teams.

JavaSpring BootgRPCKafkaPythonSnowflakeApache AirflowStreamlitSupersetSystem DesignData EngineeringBusiness IntelligenceData VisualizationArchitectureMicroservicesDomain-Driven DesignTest-Driven DevelopmentEvent-Driven ArchitectureDevOpsCI/CDDockerKubernetesTypeScriptAngularFull-Stack LeadershipProcess AutomationAI IntegrationCloud & DevOpsCross-Functional StrategyGrafanaPrometheusOpenTelemetry

Otter

Solutions Architect

08/2022 - 05/2024

•Full-Stack Leadership: Spearheaded the end-to-end architecture of global applications, directly driving growth in revenue and product subscriptions.
•Process Automation: Engineered internal tools and automations that eliminated manual workflows, saving significant labor hours across global departments.
•AI Integration: Enhanced data quality and enrichment by integrating LLMs (GPT-4) into existing data pipelines.
•Cloud & DevOps: Managed infrastructure on AWS and Google Cloud Platform (GCP) using Docker and robust CI/CD pipelines for seamless delivery.
•Cross-Functional Strategy: Partnered with Marketing and Design teams to implement technical strategies for high-scale international advertisement campaigns.

ChatbotLLMData-DrivenData ScienceMachine LearningBigQueryProject ManagementTeam BuildingDockerKubernetesTypeScriptReactNext.jsFull-Stack LeadershipProcess AutomationAI IntegrationCloud & DevOpsCross-Functional StrategyMicroservicesDomain Driven DesignPythonData Engineering

Wex

Mid-Level Software Engineer

05/2021 - 08/2022

•Platform Development: Developed mission-critical APIs for a global Risk Platform within a decentralized, international Agile squad.
•Event-Driven Design: Built high-quality software utilizing Event-Driven Architecture (EDA), ensuring system resilience through comprehensive automated testing.
•Cloud Management: Configured and deployed applications using AWS and Azure DevOps.

AWSTypeScriptNode.jsNest.jsKafkaCICDMicroservicesEvent-Driven DesignDomain-Driven DesignTest-Driven DevelopmentDockerDevOps

Sensedia

Mid-Level Software Engineer

09/2019 - 05/2021

•API Design: Implemented RESTful APIs following best-practice modeling to facilitate seamless front-end and mobile integrations.
•Observability: Monitored system health and managed centralized logging using Kibana.

API DesignAPI GatewayRESTful APIsMicroservicesDomain-Driven DesignTest-Driven DevelopmentEvent-Driven ArchitectureObservabilityJavaPythonJavaScriptQA

IBM

Junior Software Engineer

02/2018 - 08/2019

•Consultancy: Delivered a high-impact workflow application for the Telecommunications sector, managing the full customer lifecycle (Billing, Inventory, and Activation).
•Agile Delivery: Worked within a high-velocity squad to handle complex business logic for plan modifications and service removals.

JavaJavaScriptOSMDistributed SystemsClient-focusedGitDatabasesProgrammingQA

Projects

Is your menu priced right?

Marketing and insights frontend for Otter that lets restaurant owners compare menu item prices against local competition, with interactive maps, price trends, and lead capture flows.

ReactTypeScriptNext.jsTailwind CSSMaps

View screenshots →

Fraud Decisioning Platform

High-availability microservices platform processing millions of daily requests for real-time fraud decisioning and transaction flagging at scale.

JavaSpring BootKafkagRPCKubernetes

LLM Data Enrichment Pipeline

Internal automation pipeline integrating GPT-4 into existing data workflows to improve data quality and enrichment across global departments.

PythonLLMBigQueryDockerCI/CD

mellomaths.com

Personal portfolio and resume site built with Next.js, featuring a responsive dark-mode design and structured content architecture.

Next.jsTypeScriptTailwind CSSReact

GitHub →Live →

Education

Computer Science

UERJ

The 8th most important higher education institution in Brazil.

The proposal of the Bachelor's degree in Computer Science is to offer a course within the areas of Computer Science, Information Technology, and Information Technology that trains critical, active professionals who are increasingly aware of their social roles and their contribution to scientific advancement and technology in the country.

Articles

Thoughts on engineering, architecture, and AI

Ways to Obtain Number π Programmatically

Jul 4, 2025

Explore 7 ways to compute π in Python, comparing accuracy and speed using float vs. double.

Read on Medium →EN

Implementing MySQL Change Data Capture with Debezium

Nov 5, 2024

A practical guide to Change Data Capture with Debezium, Kafka Connect, and Docker for streaming MySQL database changes in real time.

Read on Medium →EN

PGP Encryption with Python

Oct 30, 2024

How to use the python-gnupg library to generate keys, encrypt and decrypt data, and sign documents with OpenPGP.

Read on Medium →EN

Ética em Inteligência Artificial

Jun 6, 2022

Reflections on ethical use of artificial intelligence, from high-profile cases to responsible AI practices.

Read on Medium →PT

A importância do HATEOAS em APIs Restful

Mar 6, 2019

What HATEOAS is and how this REST API architecture pattern improves discoverability and client integration.

Read on Medium →PT

Hobbies

Life beyond the keyboard — things I enjoy off the clock.

Vinyl Collection

Records on the shelf — browse the collection and explore what's spinning.

Browse collection →