Available for remote roles — US/EU

Hi, I'm Matheus.

I build FullStack web products.

Senior Full-Stack Engineer specialising in React.js, Next.js, Nest.js & Node.js.

6+ years shipping production web apps — from a B2B marketplace cataloging 4,000+ vehicle listings to SAP-integrated ERP tools and AI products for a Frontier Labs client. Open to remote roles with international teams across US/EU time zones.

// about

Who I am

I'm Matheus — a Senior Software Engineer based in Curitiba, Brazil, with 6+ years in the TypeScript ecosystem. I use Next.js, React, and TailwindCSS on the frontend, Node.js and Nest.js on the backend, and PostgreSQL, MariaDB, and MongoDB at the data layer. Over the years I've engineered B2B marketplaces, enterprise ERP (SAP ecosystem), EdTech platforms, and AI products for a Frontier Labs client.

Recently I wrapped a contract through G2i working on AI-related Next.js projects for a Frontier Labs client, shipping 3+ PRs a day with a heavily AI-augmented workflow. Before that I co-architected lwauto.com.br, a B2B vehicle marketplace at LW Tecnologia that catalogs 4,000+ listings, and at Golive (SAP Partner) I shipped SAP HANA-integrated software behind modern React/Next.js interfaces.

What I bring to a team: communication — I like working close to POs, PMs, and clients, making sure the product is built to the client's actual needs and avoiding re-work; product-minded engineering — translating technical trade-offs into business decisions with a customer-first approach; AI-augmented development — I'm a daily Claude Code and Cursor user, including subagent orchestration, leaning on agents for debugging, commits, pipelines, tests, and code review; and mentoring — I run hands-on React/TypeScript walkthroughs for juniors and I'm always up to pair on a hard bug. Currently open to remote opportunities with international teams across US/EU time zones.

Experience
6+ years
Location
Curitiba, Brazil (UTC-3)
Languages
Portuguese (Native)
English (Full Professional)
Spanish (Basic)
Education
Bachelor's, Computer Science
Universidade Federal do Paraná (UFPR)
Technical Degree, Informatics
Instituto Federal do Paraná (IFPR)
Open to
Remote, US/EU time zones

// experience

Where I've been

  1. Mar 2026 — Apr 2026

    Senior Software Engineer (Full-Stack) · G2i Inc.

    Remote (Contract)

    • Engaged through G2i to contribute to two AI-related Next.js projects for a Frontier Labs client, joining both at a late stage and helping land delivery on time within a 6-week engagement.
    • Shipped 3+ production PRs per day on average — validated and merged — using an AI-augmented workflow: Claude Code with subagent orchestration (a dedicated agent per task for clean context), MCP integration, and automated PR review subagents.
    • Operated in a pnpm monorepo with strict code quality gates. (Project details, client name, and internal tooling are under NDA.)
    • Next.js
    • TypeScript
    • AI
    • Claude Code
    • Cursor
    • pnpm
  2. Apr 2024 — Mar 2026

    LW Tecnologia

    Curitiba, Brazil (Hybrid)

    • Co-architected and shipped lwauto.com.br, a B2B vehicle marketplace cataloging 4,000+ listings across multiple client portals, working in a Scrum team of 4 engineers + PO + UX designer.
    • Designed and built the public B2B API with Nest.js, Prisma, and MariaDB, including a key-pair authentication middleware with per-client secret keys and an admin-side rotation flow for partner integrations.
    • Implemented real-time wallet synchronization across client portals using Server-Sent Events (SSE) — chosen over WebSockets for its simpler operational profile in a unidirectional update flow.
    • Diagnosed and fixed a silent production bug where vehicle photos appeared rotated after JPG→WebP conversion; traced the root cause to stripped EXIF orientation metadata and implemented a metadata-aware rotation step in the pipeline.
    • Designed Nest.js microservices applying hexagonal architecture, data caching, and query optimization for stability under high-concurrency workloads.
    • Built pixel-perfect, responsive frontends with Next.js (App Router, SSR/CSR mix), TailwindCSS, and TanStack Query — partnering closely with UX to ship designs exactly as intended.
    • Started architecting an integration with Brazil's Free Flow tolling system to automate toll payments for fleet vehicles (project continued by the team after my departure).
    • Maintained production systems with Elastic APM and AWS CloudWatch; mentored a junior developer through hands-on React/Hooks/TypeScript pair sessions.
    • Next.js
    • Nest.js
    • TypeScript
    • Prisma
    • MariaDB
    • TailwindCSS
    • TanStack Query
    • Server-Sent Events (SSE)
    • Elastic APM
    • AWS CloudWatch
    • Azure DevOps
  3. Nov 2021 — Present

    Independent Consultant

    Remote

    • Delivered custom web solutions for clients across industries, including Irrigate (irrigate.com.br) — modernizing legacy codebases with brand-aligned interfaces.
    • Built BusTrack CWB (bus-routes-app.vercel.app): a free, ad-free real-time public transit tracker for Curitiba using Next.js, Socket.io, React Leaflet, and open transit data served through a custom Oracle Cloud proxy.
    • Next.js
    • React.js
    • TypeScript
    • Node.js
    • Socket.io
    • React Leaflet
  4. Jun 2022 — Nov 2023

    Golive Consultoria (SAP Partner)

    Curitiba, Brazil

    • Cut p95 latency on a critical employee-hours reporting endpoint from ~20s to under 3s (~85% reduction) by replacing Node-side aggregation across 6+ MongoDB documents with a native aggregation pipeline ($lookup and computed stages) — moving compute to where the data lives.
    • Designed and delivered three ERP-integrated applications connecting SAP HANA with React/Next.js interfaces, with multi-tenant data isolation per client.
    • Built a reusable React + TailwindCSS component library that became the foundation for white-label platforms across multiple enterprise clients.
    • Implemented CI/CD pipelines with GitHub Actions, GitLab CI/CD, Firebase, and Heroku, standardizing deployment across the company's projects.
    • Mentored junior developers through code reviews, pair programming, and workshops on TypeScript generics and clean code practices.
    • React.js
    • Next.js
    • Nest.js
    • Node.js
    • TailwindCSS
    • MongoDB
    • SAP HANA
    • GitHub Actions
    • GitLab CI/CD
    • Firebase
    • Heroku
  5. May 2020 — Apr 2022

    Full-Stack Developer (Intern to Junior) · +A Educação / Imersys

    Remote (Brazil)

    • Developed EdTech platforms with Vue.js, Nuxt.js, Node.js, PostgreSQL, and MongoDB, serving thousands of concurrent users across college campuses nationwide.
    • Rendered interactive 3D anatomy models in the browser with the model-viewer library, letting medical students study body parts directly on the college's portal.
    • Implemented authentication and authorization flows using JWT and OAuth 2.0, ensuring secure multi-user access patterns.
    • Collaborated with a Scrum team to build and deploy a successful learning application used in colleges throughout the country.
    • Vue.js
    • Nuxt.js
    • Node.js
    • PostgreSQL
    • MongoDB
  6. Aug 2019 — May 2020

    Intern · Tribunal de Contas do Estado do Paraná

    Curitiba, Brazil

    • Developed and maintained internal ASP.NET applications.
    • Contributed to an audit tool that improves transparency in public spending.
    • ASP.NET
    • C#
    • JQuery

// live work

Deployed applications

A rolling showcase of sites and apps I've shipped that are live in production today.

BusTrack CWB

BusTrack CWB

Free, ad-free real-time public transit tracker for Curitiba, built on open transit data.

  • Next.js
  • TypeScript
  • Socket.io
  • React Leaflet
  • Oracle Cloud
Visit site
LW Auto Marketplace

LW Auto Marketplace

B2B vehicle marketplace cataloging 4,000+ listings.

  • Next.js
  • Nest.js
  • Prisma
  • MariaDB
Visit site
Irrigate

Irrigate

Business-facing site that expanded the client's digital reach.

  • Next.js
  • React.js
  • TailwindCSS
Visit site

// projects

Some of my projects

BusTrack CWB

Free, ad-free real-time public transit tracker for Curitiba, built on open transit data.

Next.jsTypeScriptSocket.ioReact LeafletOracle Cloud

LW Auto Marketplace

B2B vehicle marketplace cataloging 4,000+ vehicles. Co-architected full-stack with Next.js, Nest.js, Prisma, and MariaDB.

Next.jsNest.jsPrismaMariaDB

Irrigate

Business-facing website that expanded the client's digital reach. Built as a freelance engagement.

Next.jsReact

URL Shortener

TypeScript API that shortens URLs with clean architecture and REST conventions.

TypeScriptNode.jsAPI

Pokémon List

Front-end app listing the first 151 Pokémon — clean TypeScript/React showcase.

TypeScriptReact

UDP cannon

UDP cannon project aiming to study UDP network protocol

CNetworkCollege

// skills

What I work with

Core Stack

TypeScriptNext.js (App Router, Server Components, SSR/CSR)React.jsTailwindCSSNode.jsNest.js

Frontend

TanStack QueryResponsive DesignCode SplittingLazy LoadingVue.jsNuxt.js

Backend & APIs

REST API DesignMicroservicesGraphQLAuthentication (JWT, OAuth, Key-pair)Server-Sent Events (SSE)Socket.ioReal-time SystemsBullMQ

Databases & ORMs

PostgreSQLMariaDBMongoDBSAP HANAPrisma (schema design, migrations)TypeORMMongooseAggregation PipelinesQuery Optimization

Cloud & DevOps

AWS (CloudWatch, EC2, S3, Lambda, SQS)DockerGitHub ActionsGitLab CI/CDAzure DevOpsFirebaseElastic APM

AI Tooling

Claude Code (subagent orchestration, MCP integration)CursorAI-assisted development workflows

Architecture

System DesignMicroservicesMulti-tenant ArchitectureHexagonal ArchitectureClean ArchitectureDDDTDDAgile / Scrum

// contact

Let's build something

I'm currently open to remote roles with international teams — US and EU time zones especially. If you're hiring, collaborating, or just want to compare notes on Next.js, Nest.js or system design, my inbox is open.

Sai hi!