001Senior Software Engineer

João VitorWaldrich

I build backend systems that hold up under real load, and harden the infrastructure they run on. Go, Python, TypeScript, AWS, Linux.

contact@waldrich.luBlumenau, SC - Brasil
002Selected outcomes at CloudPark

94%

compute cost cut

5M+

records migrated, zero loss

850+

sites in production

85%

fewer config errors

003Selected work

Two products I designed and built end to end, and one collaboration.

01
Live
In active development

Ecclesiam

An app that answers where and when Mass is — along with confession, adoration and each parish's own events. Behind it, a dashboard for parish staff and bishops, and one backend holding every rule.

Django
PostgreSQL
Next.js
React Native
Expo

View project

02
In development

Nexfi

Personal and family finance in one place: expenses, cards, investments, savings pots and net worth, in any currency. The number shown biggest is what you still have left to spend — and you can self-host all of it.

Django
React
Vite
PostgreSQL
Docker

Private repository

03
Live

virtusdev

A barcode reader and a bill acceptor that do not exist: both emulated on Linux as a USB keyboard, so point-of-sale software can be tested against real input. Nothing to buy, and nothing left cluttering a desk.

Rust
Linux

View project

04
Live

NBA Basketball Prediction

Final-year thesis, written with three classmates: a genetic algorithm that picks the winner of an NBA first quarter from how both teams played their past ones. It reached 58.84%, short of the 70% asked for — and says so.

Python
Genetic Algorithms
Selenium
SQLite
NumPy

View project

004Career

Five years building production systems: clinical microservices at Philips, then back to CloudPark — where the promotion to Senior came in half the company's average time.

Where I've worked

  1. Sep 2025 – Present

    Promoted

    Senior Software Engineer – Technical Reference

    CloudPark

    Hardware-enabled SaaS for parking management, running across 850+ sites.

  2. Sep 2024 – Sep 2025

    Mid-Level Software Engineer

    CloudPark

  3. 2023 – 2024

    Analysis and Software Development

    Unicesumar

    Brazilian private university.

  4. Jan 2022 – Sep 2024

    Entry-Level Software Engineer

    Philips Clinical Informatics

    Clinical informatics arm of the Dutch health-technology group; systems used by European hospital networks.

  5. Aug 2021 – Dec 2021

    Entry-Level Software Engineer

    CloudPark

    Hardware-enabled SaaS for parking management, running across 850+ sites.

  6. Feb 2021 – Aug 2021

    Software Engineer Internship

    Wk Sistemas

    Brazilian ERP software company with 4k+ clients nationwide.

  7. 2018 – 2021

    Computer Science – Technical High School

    IFSC – Instituto Federal de Santa Catarina

    Public federal institute of technical education, Santa Catarina.

005Stack

What I reach for, grouped by where it sits in the system.

Languages

Go
Python
TypeScript
JavaScript
Java
C++

Backend

Django
Flask
Node.js
REST APIs
Microservices

Data

PostgreSQL
DynamoDB
MongoDB
Redis
SQLite

Cloud & Infra

AWS
Docker
Linux
CI/CD
Vercel

Security

OWASP
Burp Suite
Metasploit
Security

AI

AI Agents
Claude Code
RAG
Machine Learning
006Contact

Let's talk about what you're building.

Open to remote roles across North America and Europe, with EU work authorization via Luxembourg.