Web · Data & AI · Networks · Belo Horizonte / remote

Web and data systems that turn improvised processes into working products.

I build web products, dashboards, APIs, and data-driven automations. My experience connects interfaces and backend engineering with R, Python, databases, and foundations in AI and networks.

I build web and data products from interface to backend, using R, Python, and AI.

Discuss a projectSee delivered work ↓

01 / Choose a starting point

How I can help

Four ways I turn an idea, prototype, or technical problem into software that works in real use.

01 / BRIEF

Web MVP development

For turning an idea into a usable, testable first version ready to learn from real users.

From idea to a first version ready to test with real users.

Typical delivery
Technical scope, responsive interface, backend, database, and deployment of the first version.
Good fit
Projects with a clear goal, short cycles, and room to evolve through feedback.
View details
Typical delivery
Technical scope, responsive interface, backend, database, and deployment of the first version.
Good fit
Projects with a clear goal, short cycles, and room to evolve through feedback.
Build my MVP
02 / BRIEF

From vibe code to real product

When a prototype built quickly with AI proves the idea but still needs engineering before it can serve users reliably.

I turn AI-built prototypes into stable products ready to grow.

Typical delivery
Architecture and code audit followed by improvements to security, data, responsiveness, tests, and deployment.
Good fit
Promising prototypes that need stability, maintainability, and a foundation ready to grow.
View details
Typical delivery
Architecture and code audit followed by improvements to security, data, responsiveness, tests, and deployment.
Good fit
Promising prototypes that need stability, maintainability, and a foundation ready to grow.
Evolve my prototype
03 / BRIEF

Applied data science

I turn data into analysis, reporting, and experiments that clarify problems and support decisions.

Data turned into analysis and experiments that support decisions.

Typical delivery
Hands-on experience with R, Python, SQL, reporting, and machine learning foundations applied to real problems.
Good fit
Projects connecting data exploration, software, and a well-defined business question.
View details
Typical delivery
Hands-on experience with R, Python, SQL, reporting, and machine learning foundations applied to real problems.
Good fit
Projects connecting data exploration, software, and a well-defined business question.
Explore a data project
04 / BRIEF

Software engineering

I build and evolve robust products across frontend, backend, APIs, data, and network fundamentals.

End-to-end engineering to build and evolve robust systems.

Typical delivery
Fullstack experience with TypeScript, Node.js, React, databases, cloud, and building systems from scratch.
Good fit
Products and technical challenges that benefit from a complete view of the system, from interface to infrastructure.
View details
Typical delivery
Fullstack experience with TypeScript, Node.js, React, databases, cloud, and building systems from scratch.
Good fit
Products and technical challenges that benefit from a complete view of the system, from interface to infrastructure.
Explore a collaboration
Card 1 of 4

02 / Delivery evidence

Selected work

BUILD01

BioByte Brasil · live product

Improving SaciHPlus, a healthcare software platform

12+ reports rebuilt and new data and file foundations delivered for a live healthcare product.

Problem

SaciHPlus needed to improve reporting and features while protecting workflows already in use.

Build

Rebuilt 12+ reports with R and Node.js, implemented soft deletion, and configured Amazon S3 for new functionality.

Deliverable

Deliverables incorporated into the continued development of SaciHPlus, a product developed by BioByte Brasil.

My role: Fullstack work across reports, persistence rules, and file infrastructure.

View details

Problem

SaciHPlus needed to improve reporting and features while protecting workflows already in use.

Build

Rebuilt 12+ reports with R and Node.js, implemented soft deletion, and configured Amazon S3 for new functionality.

My role

Fullstack work across reports, persistence rules, and file infrastructure.

  • Node.js
  • R
  • Amazon S3
  • Databases
BUILD02

Team delivery · anonymized case

Responsive interfaces built from client requirements

Wireframes and requirements turned into responsive interfaces delivered as a team.

Problem

Client projects needed to turn wireframes and requirements into clear pages across screen sizes.

Build

Implemented web pages for two initiatives served through a university junior enterprise.

Deliverable

Responsive interfaces delivered through the team's collaborative workflow.

My role: Frontend development within a team and responsive interface adaptation.

View details

Problem

Client projects needed to turn wireframes and requirements into clear pages across screen sizes.

Build

Implemented web pages for two initiatives served through a university junior enterprise.

My role

Frontend development within a team and responsive interface adaptation.

  • React
  • TypeScript
  • Responsive CSS
BUILD03

Systems project · public code

SimpleDB: a key-value database over TCP

A Redis-inspired C++ key-value database with TCP networking and concurrent clients.

Problem

Explore how storage, concurrency, and network communication come together in a data service.

Build

An in-memory NoSQL database with key-value operations, a TCP server built with POSIX sockets, and multithreaded client handling.

Deliverable

An executable Redis-inspired implementation demonstrating backend, networking, concurrency, and data-structure fundamentals.

My role: Architecture and implementation of the server, client, and command protocol in C++.

View details

Problem

Explore how storage, concurrency, and network communication come together in a data service.

Build

An in-memory NoSQL database with key-value operations, a TCP server built with POSIX sockets, and multithreaded client handling.

My role

Architecture and implementation of the server, client, and command protocol in C++.

  • C++
  • TCP/IP
  • POSIX Sockets
  • Multithreading
View project code ↗
Card 1 of 3

Stack / my build kit

Technologies

I like working across the whole product: from the interface someone uses to the data and models that make the system think. These are the tools that shaped that path.

theo.kiwi / stack

Fullstack

Interfaces, APIs, databases, and infrastructure for shipping real products.

13
  • TypeScript
  • JavaScript
  • Node.js
  • React
  • Angular
  • SQL
  • MySQL
  • SQL Server
  • Amazon S3
  • AWS
  • Java
  • C / C++
  • C#

Data & AI

Analysis, experimentation, and models that turn data into decisions.

05
  • Python
  • pandas / NumPy
  • scikit-learn
  • PyTorch
  • R

The tool changes with the problem. My curiosity to understand the whole system does not.

03 / From problem to real use

How I work

  1. 01

    Understand

    We align on the problem, its users, and what needs to change.

  2. 02

    Scope

    I turn the need into priorities, boundaries, and a clear proposal.

  3. 03

    Build

    I develop in short cycles, with demos and visible decisions.

  4. 04

    Deliver

    I deploy, document, and support the transition into real use.

04 / Field notes

Selected insights

The first articles are being prepared. In the meantime, you can follow the Substack profile.

Follow on Substack ↗

Contact

Tell me a little about the problem. I will reply with questions, next steps, and an honest fit assessment.

theo.kiwi:~$ ./contact
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