Matheus Muniz

Backend engineer with 3+ years of experience building systems in Java, TypeScript and AWS, and tracking down the production problems they run into

Currently Java Software Engineer at Heimdall Data

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Work Experience

Heimdall Data

Java Software Engineer

Heimdall Data

Jan 2026 – Present
  • Resolved enterprise data replication failures between SQL Server and Oracle GoldenGate by diagnosing a TDS wire protocol issue via Wireshark packet analysis, delivering a validated backport fix to unblock customer pipelines
  • Hardened an embedded CloudBeaver proxy service for production deployment, implementing role based HTTP access control, stateless ephemeral credentials, and a typed GraphQL client for secure internal communication
  • Diagnosed complex production incidents across MySQL, Oracle, and PostgreSQL setups, utilizing Docker replicas and TCP flow control analysis to isolate root cause driver and F5 load balancer behaviors
Sys Manager

Java Developer

Sys Manager

Aug 2025 – Jan 2026

20 s → 500 msAPI response time, after re-architecting data access with Hibernate lazy loading

  • Architected a bulk email delivery system, using message brokers (Kafka) and microservices (Java and Quarkus) to guarantee fault tolerance and scalability in the proposed architecture
  • Reduced integration time between frontend and backend teams by adopting a contract-first development workflow using OpenAPI and Swagger to ensure seamless collaboration and predictable delivery
Westpoint Software Solutions

Software Engineer

Westpoint Software Solutions

May 2023 – Aug 2025

100%of a mobile app's subscription payments processed from launch, through a serverless webhook integration

  • Eliminated API latency for end users by architecting an asynchronous transactional email system (API Gateway, SQS, Lambda), improving API response times by an estimated 70% and decoupling core services for enhanced long term maintainability
  • Reduced infrastructure costs by over 15% and reduced deployment time by implementing Infrastructure as Code with AWS CDK, automating the provisioning of all serverless resources and eliminating manual configuration errors
  • Improved system uptime by proactively identifying and resolving production incidents, reducing the Mean Time to Resolution (MTTR) for critical alerts by an estimated 30% using a combination of CloudWatch, Sentry, and New Relic

Personal Projects

ResumeRefine

  • Java
  • TypeScript
  • Node.js
  • Next.js
  • AWS
resume-refine.comSource on GitHub

A free tool that reads your résumé with AI and emails you its strengths, weaknesses and suggestions

Uploads land in S3. Each new object fires an event onto an SQS queue, so a burst of uploads never overwhelms the analysis

A Lambda function takes each job from the queue, has an AI model score the résumé, and emails a link to the results

Requests are rate-limited by IP, with request metadata stored in DynamoDB, which keeps usage and costs under control

All of it is defined as infrastructure as code, in an AWS CDK stack written in Java

ForexPro

  • Java
  • Spring Boot
  • RabbitMQ
  • Docker
  • TypeScript
  • Next.js
  • PostgreSQL
Source on GitHub

A foreign exchange trading simulator. Trade GBP and USD from a demo balance and watch the rates move live

Trades go to a Spring Boot REST API, which hands them to RabbitMQ through Spring Integration, so placing a trade never waits on processing

Exchange rates are pushed to the dashboard over WebSockets as they change

Every service runs in its own Docker container

About Me

Matheus Muniz

I'm a backend engineer with 3+ years of experience building and debugging production systems in Java and TypeScript

Most of my work has been on AWS serverless: event-driven pipelines with Lambda, SQS, EventBridge and API Gateway, provisioned with CDK. More recently I've worked in Java with Quarkus and Kafka, and on database connectivity issues across SQL Server, Oracle, MySQL and PostgreSQL, down to the wire-protocol level

I care about clear API contracts, data models that hold up over time, and systems the next engineer can understand. I've also built frontends in React and Next.js, so I design APIs with the people consuming them in mind

Certifications

GitHub Contributions

 

Client Websites

Websites I've designed and built for clients, from campaign landing pages to an e-commerce redesign

woom.com.br
Woom
  • Visit site

Testimonials

“Matheus, the pages turned out amazing, exactly as we imagined. Thank you for the support and great work!”
Gabriel NavarroDigital Influencer in the finance niche
“Matheus, your attention to detail and ongoing support were essential. We needed a developer to apply our design with precision, and you did it perfectly. Our partnership was marked by professionalism from start to finish”
Giovana FiorilloCEO of Griffo ADS
“Thank you so much for all the support! It looks amazing, and we are very happy with the result!”
BluebellBlueBell Confectionery

Get in touch

Have a role or project in mind? Send a message with the form below or reach out on LinkedIn, and I'll get back to you

or email matheusmuniz215@gmail.com