Open to opportunities · RemoteSão Paulo · BR— —:— —

MatheusSartori

Software engineer based in São Paulo. 9+ years designing architecture, code and products running in production for global companies — obsessed with performance, clarity and what matters to the end user.

02 · Impact

What I shipped
to production.

01since 2017
0+
Years building
Building production software since 2017 — from first internship to tech lead.
02auth / jwt
0K
Users authenticated daily
Across auth services I designed and still maintain — Best Buy, Surest, Qualcomm, FedEx, AARP.
03qa · playwright
0%
Fewer production defects
Playwright E2E framework I designed from scratch for LivePerson bots, adopted by the team.
04peak load
0K+
Simultaneous redemptions at peak
Children's Day cashback platform — 30K+ users redeemed without downtime, on autoscaling GCP.
03 · Brands shipped for

Companies that trusted
my code in production.

Retail2023 → 24
Best Buy
Built the secure bridge between the mobile app and the support chatbot — members get in seamlessly, with the backend safely out of reach.
B
Health2023 → 24
Surest
Designed the layer that carries each member's health-plan context into the chat the moment it opens — no extra steps, no waiting.
S
Semiconductors2024
Qualcomm
Connected the corporate app to the conversational channel so associates carry their identity and permissions wherever they go.
Q
Logistics2024
FedEx
Made the jump from app to support feel like a single experience — no re-login, no lost history, no friction.
F
Membership2024
AARP
Kept member sessions alive and trusted across channels, so the support team always sees who they're talking to in real time.
A
E-commerce2021 → 23
Mercado Libre
Regional platforms and activations for LATAM campaigns. Next.js front-end and Node back-end hosted on GCP.
M
FMCG2022
Ferrero
Children's Day cashback platform — 30K+ simultaneous redemptions on autoscaling GCP infra.
F
Beverages · AR2019 → 21
AB InBev
AR experiences on bottle labels with AR.js and Unity. The first delivery's success unlocked multiple contracts.
A
Pharma2022
Novo Nordisk
Digital platforms for internal campaigns and healthcare professional engagement — full stack with a compliance focus.
N
04 · Career

Building
systems since 2017.

2023 — Present

Senior Full Stack Engineer — Miratech

Designed a Playwright-based E2E framework for the chatbot platform, cutting production defects by 70%. Built the chatbot module of the mobile app in React Native, exposing the support channel to hundreds of thousands of members who had no prior access.

Developed the Node.js service that issues JWTs with health-plan eligibility — authenticating 100K+ users daily across integrations with Best Buy, Surest, Qualcomm, FedEx and AARP.

ReactNode.jsReact NativeTypeScriptDockerApache KafkaKubernetesJavaPythonAWS
New York · Remote
Full-time
2024

Senior Full Stack Engineer — Progress Labs

Sole developer of a Next.js SaaS platform: users subscribe via Stripe and receive automatic web accessibility reports for the sites they register. Back-end on API routes, Cloud Tasks and Cloud Run; reporting directly to the IT director.

Next.jsNode.jsTypeScriptGoogle Cloud
New York · Remote
Part-time
2021 — 2023

Senior Engineer & Tech Lead — Mandarin Agency

Co-founded the agency's engineering department alongside the IT director: hired and mentored developers, established code review, git flow, scrum, test automation and CI/CD practices.

Led the delivery of a cashback platform for a multinational food company during Children's Day — 30K+ concurrent users redeemed cashback without downtime. Managed the full infrastructure on GCP and Vercel, optimizing cost via recurring allocation reviews.

Next.jsNode.jsTypeScriptMySQLGoogle CloudGraphQL
São Paulo · Remote
Tech Lead
2021

Senior Full Stack Engineer — Rojemac

Solved recurring third-party ERP instability with a Next.js SSG fallback — result: +30% orders created per month. Established the company's testing culture with Jest and Supertest, reducing production regressions.

Next.jsNode.jsTypeScriptPostgreSQLGraphQLMongoDB
São Paulo · Hybrid
2018 — 2021

Full Stack Engineer — KASI

Designed AR experiences on bottle labels for one of the world's largest breweries with AR.js and Unity — the project's success unlocked multiple follow-up contracts. Built an award-winning glass-recycling ecosystem via reverse logistics in React Native and Node.js, responsible for 7000+ tons recycled to date.

ReactReact NativeNode.jsReduxMySQLUnityAWS
São Paulo · On-site
2017 — 2018

Full Stack Engineer — Betalabs

Built the bank-slip (boleto) processing module integrated with one of Brazil's largest banks, enabling a new checkout method across the entire e-commerce platform.

Node.jsReactJavaScriptMySQLPHP
São Paulo · On-site
2017

Intern Full Stack Engineer — Noatel

Started my career automating processes with React and Node.js: turning static pages into a CMS, automating newsletters and building internal tools that unlocked team productivity.

ReactNode.jsJavaScriptPHPMySQL
São Paulo · On-site
05 · Stack

The tools I'm
fluent in.

01

Languages

05 items
02

Frontend

05 items
03

Backend

05 items
04

Data

03 items
05

Cloud & DevOps

09 items
06

Testing & QA

04 items
07

Game Development

03 items
06 · Personal projects

Code I write
out of curiosity.

01/02
Blockwright
012026

Blockwright · Minecraft 3D structures

An Electron desktop app that loads Minecraft .nbt structure files and renders them as interactive 3D scenes with Three.js — and can AI-generate new builds from a prompt or reference image through an emit → render → review loop, on your own Claude or Codex subscription.

Game Dev · Frontend · Dev ToolsIn production
TypeScriptReactElectronThree.jsVitestVite
Visit website ↗ GitHub ↗
Hackerchat
022021

Hackerchat · real-time chat

A real-time chat ecosystem around a client-agnostic core — a WebSocket server, a terminal (TUI) client and a JavaScript SDK with React bindings for the web.

CLI · BackendIn production
JavaScriptNode.jsExpressSocket.IOTypeScript
Live preview ↗Visit website ↗
07 · Recommendations

What colleagues
say about working with me.

LinkedInAug 10, 2023

Working with Matheus is like having a tech-ninja master beside you! The guy is a true wizard with Node.js, React and everything else, in JavaScript or TypeScript. On top of that, he's a walking dictionary of creative, efficient, scalable and secure solutions — complete with docs and test coverage. His experience is honestly surreal: even when things get tangled, he untangles them with incredible clarity.

AS
Adriel Santana
Software Engineer · Tech Leader · AI/LLM · Co-Founder
Worked on the same team
01/25
auto
Want to verify? See on LinkedIn ↗
08 · Let's talk

Got a hard
problem? I'd love to hear.