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Hi, I'm

Arthur Mancio Sales

Software Engineer (Mid-level) | Front-end & Fullstack

React, Node.js, TypeScript

São José dos Campos, SP – Brazil

Software Engineer with 3+ years of experience building and maintaining production web applications used by 16,000+ users across 233 organizations. Strong focus on Front-end engineering with Next.JS, React/TypeScript and solid Fullstack experience with Nest.JS, Node.js, REST APIs, databases, automated testing, and cloud. Comfortable working end-to-end and collaborating with Product, Design, and Backend teams.

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Impact Map

Tangible results delivered throughout my career

Experience

Software Engineer (Mid-level)

Instituto Alpha Lumen

Mar 2023 – Present
Current
  • Developed and maintained platforms serving 16,000+ users across 233 schools/organizations
  • Built front-end applications with React, Next.js, TypeScript
  • Designed/integrated backend services and REST APIs using Node.js (NestJS)
  • Implemented automated testing with Jest and Cypress
  • Observability and error monitoring with Sentry
  • CI/CD with GitHub Actions; deployments with Vercel and AWS (EC2, S3, RDS); Docker
  • Mentored junior developers through code reviews and guidance

Projects

Portal Olimpíadas
Lead Front-end Engineer

Greenfield platform; architecture + UI patterns; tests + observability from day one; 70% admin time reduction; 3,500+ participants.

Frontend
Testing
Observability

OIMC
Software Engineer

International Math and Knowledge Olympiad. Legacy system stabilization; critical route optimization 15s+ → ~1.5s; +30% concurrency.

Backend
Performance
Infrastructure

Workshop Ticket Platform
Fullstack Developer

Ticket sales; Mercado Pago payment flow; QR validation; admin dashboard.

Frontend
Backend
Infrastructure

Skills

Frontend

React
Next.js
TypeScript
JavaScript
HTML5
CSS3
Tailwind CSS

Backend

Node.js
NestJS
REST APIs
Express.js
Prisma ORM

Databases

PostgreSQL
MySQL
MongoDB
Redis

Testing

Jest
Cypress
React Testing Library

DevOps/Cloud

Git
Docker
CI/CD
Vercel
AWS (EC2, S3, RDS)
GitHub Actions
Firebase (Firestore, Firebase Functions)

Observability

Sentry

Practices

Agile/Scrum
Code Review
Documentation
Mentoring

Focus Areas

Performance
Accessibility
Testing
Design Systems
Observability
APIs & Integrations
CI/CD

Currently Learning

Technologies I'm currently studying

TanStack Query (React Query)
Zustand
GraphQL
Firebase Analytics/Crashlytics
OpenTelemetry
Message Queues (RabbitMQ/Kafka)

Contact

Let's talk?

Location

São José dos Campos, SP – Brazil

LinkedIn

linkedin.com