Vinicode: the Blog

Kerplunk: 2025

• Ruby on Rails
• React
• Python
• Amazon AWS

Full-stack software engineer at Kerplunk, an AI-powered staffing and recruiting platform that helps organizations source, recruit, and retain talent. I ship features across a Ruby on Rails 8 backend and a React frontend.

Integrated LLMs so recruiters can analyze candidates and job descriptions — including sentiment analysis on interview feedback and word-cloud views that surface themes at a glance.

Exposed internal tools to LLMs through the Model Context Protocol (MCP) and built chatbots that answer recruiter and candidate questions inside the product.

Wrote Python AWS Lambda services for asynchronous, event-driven work beside the Rails core, with automated tests covering both Ruby and Python.

Used AI coding agents day to day for features and refactors, with the test suite as the safety net for their output.

Lillio Observations: 2024

• Ruby on Rails
• React
• PostgreSQL
• Amazon AWS

At Lillio I was tech lead and full-stack engineer for Observations — a product feature built with Ruby on Rails, React, React Native, PostgreSQL, and AWS. I connected a solid backend to a responsive web and mobile UI. More details are in the Lillio support guide.

Lune: 2023

• .NET
• MySQL
• Vue.js

Payment management system for Cappta's gateway, built with .NET Core, Microsoft SQL Server, and Vue.js.

Ideallang English: 2022

• WordPress
• MySQL

English course website on WordPress and MySQL, built with another engineer. Live at ideallang.com.

Posto7: 2021

• React
• Firebase

Nutrition app on React, Firestore, and Firebase. My main contribution was the admin portal for the back-office team.

PSMI: 2020

• Ruby on Rails
• PostgreSQL
• Node.js
• Amazon AWS

(Maintenance) Brazilian education platform with many courses — Ruby on Rails, PostgreSQL, Express, Google Cloud Functions, and AWS. I upgraded Ruby and Rails versions and moved infrastructure from GCP to AWS.

Mangue Tecnologia: 2020

• Ruby on Rails
• PHP
• MySQL

(Maintenance) Educational platform with a wide course catalog in Brazil, using Ruby on Rails, PHP, JavaScript, and MySQL. I also built several e-commerce sites to improve checkout and day-to-day usability.

Chefstrela: 2019

• WordPress
• MySQL

Gastronomy e-commerce on WordPress and MySQL, delivered with another engineer and a designer.

Casa Roberto Marinho: 2018

• Ruby on Rails
• MySQL
• jQuery

Content management system for a cultural and educational organization, built with Ruby on Rails, MySQL, and jQuery.

Kariri Sapuyá: 2018

• Ruby on Rails
• Elasticsearch
• MySQL
• MongoDB

Digital archive and CMS for historical documents about Indigenous peoples of Northeast Brazil — Ruby on Rails, Elasticsearch, jQuery, MySQL, and MongoDB. App: Kariri Sapuyá.

Perceive: 2017

• Python
• MySQL

Tool that pulls useful vulnerability signals from mailing lists — Python, Jupyter notebooks, Flask, and MySQL. More on the Perceive project page.

Conserve Piso: 2017

• PHP
• MySQL
• jQuery

Web app for flooring project management (PHP, MySQL, jQuery) that replaced paper-heavy workflows with a clearer digital process.

DPMS: 2015–2017

• Ruby on Rails
• MySQL
• jQuery

Digital project management system for industrial work — Ruby on Rails, MySQL, jQuery, and Telerik Kendo — built to replace fragile spreadsheets. More at Oxeanbits.

Atlântico Português: 2014

• Ruby on Rails
• PostgreSQL
• Elasticsearch
• jQuery

CMS and search for a digital historical archive — Ruby on Rails, PostgreSQL, jQuery, and Elasticsearch. App: Atlântico Português.