Eduardo Santarosa, Full-stack Developer

Real problems I solved at work, told without exposing clients or code.

More cases

• NF-e 1201XML

  Example Supplier (made up)

  $4,560.00

  • Unique access keyPASSED
  • Supplier exists in the ERPPASSED
  • Order or contract foundPASSED
  • Enough balancePASSED
  • Supplier's representativeSKIPPED

  Approved for posting

  Integrations

  An automatic checklist between the invoice and the ERP

  Supplier invoices checked against purchase orders and contracts the moment they arrive.

• SessionDowntown workshop

  • Downtown

    • OS 311205/55 R16
    • OS 312185/65 R15

    no access

  • North

    • OS 87175/70 R14
    • OS 88195/60 R15

    no access

  • South

    • OS 140205/55 R16
    • OS 141185/65 R15

    no access

  Business systems

  Work orders and stock for a network of workshops

  Each workshop sees only its own data, and stock counts point out where the numbers don't match.

• Finance panel · Company A

  Invoice 1234 · Example Supplier

  • 1/3 · $1,200.00✓ settled
  • 2/3 · $1,200.00✓ settled
  • 3/3 · $1,200.00✓ settled

  Cloud ERP

  Accounts payable

  • 1/3✓ paid
  • 2/3✓ paid
  • 3/3✓ paid

  Integrations

  Accounts payable in sync with a cloud ERP

  A finance panel for several companies in a group, with bills grouped by invoice and synced with the ERP.

Things I build on my own, to learn, to test an idea or just because I wanted them to exist.

• //DAILYCLS JOB AURORA

  STEP01 NORMALIZE ...... OK

  STEP02 POST D/C ....... OK

  STEP03 RECONCILE ...... OK

  STEP04 REPORTS ........ OK

  DEBIT 1,250,000.00 = CREDIT ✓

  Aurora Mainframe Banking

  A made-up bank's daily financial closing in COBOL: normalizes transactions, posts double-entry accounting, reconciles and produces batch reports.

  • GnuCOBOL

• vault/*.md

  [[Valen]][[The Tower]][[Iria]][[Quest 3]][[Map]]

  LoreForge

  A local-first workspace for worldbuilding: reads a vault of Markdown files, indexes it and lets you browse lore, quests and scripts.

  • Next.js
  • TypeScript

• ♪ now playing

  city lights are coming on

  accuracy 98%72 wpm

  Lyric Type

  Typing practice synced to the lyrics of the song that is playing: it finds the synced lyrics, plays the video behind the screen and scores speed and accuracy line by line.

  • Next.js
  • TypeScript

  Code on GitHub

• My garden2 ready to harvest

  My Garden

  A full-stack virtual garden game: plant, grow, harvest and share, with its own Go API.

  • Go
  • React

  Code on GitHub

• contract.pdf · p. 2

  What's the payment term?

  30 days after delivery. [p. 2]

  Document Assistant

  Questions about PDFs and images, with OCR running in the browser and answers that point to the source passage.

  • TypeScript
  • Tesseract.js
• 190 m

  iron53

  copper17

  energy

  Deep Drill

  A browser idle mining game with refining, drills, generators, energy limits and offline gains.

  • Go
  • TypeScript

• LIVEcycle 3 of 8, no repeats

  clip-07.mp4

  • clip-01.mp4
  • clip-08.mp4
  • clip-03.mp4

  YT Radio Stream

  A continuous YouTube live stream from a folder of clips, shuffled without repeats until the cycle ends, re-encoded with ffmpeg and sent over RTMPS. New clips are picked up without a restart.

  • Python
  • ffmpeg
  • Docker

  Code on GitHub

• podcast.mp4 · one frame per minute

  • 00:00
  • 01:00
  • 02:00
  • 03:00

  • podcast_segment_2_default.mp4
  • podcast_segment_4_vertical.mp4

  Segmentor

  Desktop app that shows one frame per minute of a long video and cuts the minutes you pick, wide or vertical 9:16, with the machine's hardware encoder (VideoToolbox or NVENC).

  • Python
  • PyQt6
  • ffmpeg

  Code on GitHub

• You've earned today

  R$187.4200

  64% of the workday+0.013/s

  Salário Contado

  Shows in real time how much you've earned today, from your salary and working hours.

  • Next.js

  Code on GitHub

• Chats

  New chat22/06 21:29

  New chat21/06 18:04

  New chat16/06 09:12

  Hello! How can I help you today?

  What can you help me with?Can you give me a quick tip?

  What can you help me with?

  typing… (~3s)

  I'm here to help! What would you like to know?

  Type your message…

  Chatbot Assistant

  A chat with login where every conversation is saved and can be picked up again from the sidebar, with a typing indicator while the reply comes in.

  • Laravel
  • Livewire
  • MySQL

  Code on GitHub

Tools

Backend

• Node.js
• TypeScript
• Fastify
• Express
• NestJS
• Python
• FastAPI
• PHP
• Laravel

Frontend

• React
• Next.js
• Vite
• Tailwind CSS
• shadcn/ui
• Material UI

Mobile

• React Native
• Expo

Data

• PostgreSQL
• MySQL
• Redis
• TypeORM
• Prisma
• Knex
• SQLAlchemy

Automation

• Playwright
• Puppeteer
• pywinauto
• PDF and Excel

Infra

• Docker
• Git
• GitFlow
• AWS S3
• WebSockets

1. Aug 2022 to present

   Full-stack Developer, NEC Brasil

   Americana, Brazil

   I build and maintain web systems for clients across several industries: integrations with partner APIs such as Omie, TecnoSpeed, Vuupt and D4Sign, PDF and Excel report automation, RPA robots, and support for systems in production.

Systems I've built and maintained

• HR and vacations

  vacation balances, medical exam and document reminders

• Quality and inspections

  inspections, surveys and reports

• Finance

  payables, settlements and dashboards

• Billing

  invoices, customers and collection

• Quotes and sales

  approval, history and automatic e-mails

• Workshops

  work orders, stock and counts

• Equipment

  serial number tracking and technical support

• Logistics

  order picking and checking on the phone

• Transport

  service authorizations and settlements

• Service portal

  tickets, scheduling and refunds

• Tax automation

  robots and document checks

• Integrations

  ERPs, e-commerce, e-signature and routing

Education

1. 2024 to 2028, in progress

   Computer Science, Faculdade de Americana

2. 2021 to 2023

   High school and IT technical course, Colégio Politec

Want to talk about a system, a project or an idea? E-mail is the fastest way to reach me.