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Matheus Costa

@matheuscosta1

Tech lead at Xometry building Thomas advertising and attribution; migrated 2.2M+ users to Auth0 without data loss or forced logins.

Brazil

Message

At Xometry, I lead the Thomas Supplier Experience team, which builds campaign management, ad delivery, and ROI attribution for 2,500+ suppliers. I’m improving ad targeting and serving, and building the infrastructure behind campaign management and attribution.

I also built a shared Playwright and TypeScript platform where engineers write end-to-end tests in natural language. For identity, I moved 2.2M+ users to Auth0 in phases, without data loss or making anyone log in again.

At Blue Orange Digital, I was lead developer on Insight Partners’ portfolio platform, owning its backend and APIs and running the AWS setup with Terraform. At Rock, I built the task board, time tracker, and virtualized chat and task lists for an app used by thousands of active users.

I started out contributing to open-source C++ game servers and building web apps around them. I’ve also worked on COVID-19 modeling with Universidade Federal Fluminense, where local government used the results in its decision-making.

Experience

Work history, roles, and key accomplishments

Current

Tech Lead & Senior Software Engineer

Current

Xometry

Oct 2024 - Present (2 years)

Tech lead of the Thomas Supplier Experience team, managing advertising for 2,500+ suppliers and over $15M in yearly revenue. Led identity migration to Auth0 and built an AI-assisted end-to-end test platform.

TypeScript NodeJS React Playwright Stagehand AWS Auth0 OAuth OIDC JWT Kubernetes Terraform GraphQL ArgoCD Sentry

Full Stack Engineer

Blue Orange Digital

Feb 2023 - Sep 2024 (1 year 7 months)

Lead developer on Insight Partners' portfolio platform, built with Next.js, Nest.js and Postgres on AWS. Owned backend APIs and AWS infrastructure, and took 1st place in the Insight Partners hackathon.

Next.js NestJS Prisma PostgreSQL AWS Terraform Kubernetes

Front-end Engineer

Rock

Jul 2020 - Mar 2023 (2 years 8 months)

Core engineer on Rock, an async work app with chat, tasks, notes and video. Built the task board, time tracker, virtualized lists, and helped ship the Electron desktop app.

React TypeScript Electron Virtualization

COVID-19 Researcher

Universidade Federal Fluminense

May 2020 - Jul 2020 (2 months)

On the GET-UFF modeling team, scraped official data, built SIR/SEIR models and fitted parameters with a modified particle swarm optimizer in Python and R. Results were used by local government during the pandemic.

Python R Data Analysis Modeling

C++ & Full-Stack Developer

Freelance & open source

Dec 2016 - Jul 2020 (3 years 7 months)

Contributed to The Forgotten Server, an open-source MMORPG server in C++ and Lua, with 23 merged pull requests. Debugged multithreaded servers, reverse-engineered network protocols, and built web apps for game servers.

C++Lua TypeScript NodeJS MongoDB

Teaching Assistant

Universidade Federal Fluminense

Jan 2017 - Nov 2018 (1 year 10 months)

Ran the problem-solving lab for first-semester CS students, working through ICPC problems in Python, and reworked the syllabus. Named the department's best teaching assistant.

Python Teaching Problem Solving