Vinicode: the Blog

Kerplunk: 2025

• Ruby on RailsRuby on Rails
• ReactReact
• PythonPython
• Amazon AWSAmazon 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 RailsRuby on Rails
• ReactReact
• PostgreSQLPostgreSQL
• Amazon AWSAmazon AWS

I was tech lead and full-stack engineer on Observations at Lillio, a product feature that helps educators record and review classroom observations.

I connected a Ruby on Rails and PostgreSQL backend to responsive React and React Native interfaces on AWS.

Educators can follow the workflow in the Lillio support guide.

Lune: 2023

• .NET.NET
• MySQLMySQL
• Vue.jsVue.js

I built a payment management system for Cappta's gateway so operators could track and reconcile transactions more reliably.

The stack was .NET Core, Microsoft SQL Server, and Vue.js on the front end.

Ideallang English: 2022

• WordPressWordPress
• MySQLMySQL

I built an English course website with another engineer so students could browse courses and enroll online.

We shipped it on WordPress and MySQL.

The site is live at ideallang.com.

Posto7: 2021

• ReactReact
• FirebaseFirebase

I worked on Posto7, a nutrition app backed by React, Firestore, and Firebase.

My main contribution was the admin portal that lets the back-office team manage content and users without touching the mobile client.

PSMI: 2020

• Ruby on RailsRuby on Rails
• PostgreSQLPostgreSQL
• Node.jsNode.js
• Amazon AWSAmazon AWS

I maintained a Brazilian education platform that hosts a large catalog of courses.

The stack included Ruby on Rails, PostgreSQL, Express, Google Cloud Functions, and AWS.

I upgraded Ruby and Rails versions and moved infrastructure from GCP to AWS so the product could keep shipping on a supported platform.

Mangue Tecnologia: 2020

• Ruby on RailsRuby on Rails
• PHPPHP
• MySQLMySQL

I maintained an educational platform with a wide course catalog in Brazil, using Ruby on Rails, PHP, JavaScript, and MySQL.

I also built several e-commerce sites that improved checkout flows and day-to-day usability for store operators.

Chefstrela: 2019

• WordPressWordPress
• MySQLMySQL

I delivered a gastronomy e-commerce site with another engineer and a designer so customers could browse and order culinary products online.

We built it on WordPress and MySQL.

Casa Roberto Marinho: 2018

• Ruby on RailsRuby on Rails
• MySQLMySQL
• jQueryjQuery

I built a content management system for a cultural and educational organization so editors could publish and organize materials without developer help.

The app used Ruby on Rails, MySQL, and jQuery.

Kariri Sapuyá: 2018

• Ruby on RailsRuby on Rails
• ElasticsearchElasticsearch
• MySQLMySQL
• MongoDBMongoDB

I built a digital archive and CMS for historical documents about Indigenous peoples of Northeast Brazil.

The system used Ruby on Rails, Elasticsearch, jQuery, MySQL, and MongoDB so researchers could search and browse the collection.

The app is available at Kariri Sapuyá.

Perceive: 2017

• PythonPython
• MySQLMySQL

I built Perceive, a research tool that extracts useful vulnerability signals from security mailing lists.

The pipeline used Python, Jupyter notebooks, Flask, and MySQL.

More detail is on the Perceive project page.

Conserve Piso: 2017

• PHPPHP
• MySQLMySQL
• jQueryjQuery

I built a web app for flooring project management so field teams could leave paper-heavy workflows behind.

The stack was PHP, MySQL, and jQuery, and it gave the company a clearer digital process for tracking jobs.

DPMS: 2015–2017

• Ruby on RailsRuby on Rails
• MySQLMySQL
• jQueryjQuery

I built a digital project management system for industrial work so teams could replace fragile spreadsheets with a shared application.

We used Ruby on Rails, MySQL, jQuery, and Telerik Kendo.

More about the company is at Oxeanbits.

Atlântico Português: 2014

• Ruby on RailsRuby on Rails
• PostgreSQLPostgreSQL
• ElasticsearchElasticsearch
• jQueryjQuery

I built a CMS and search layer for a digital historical archive so researchers could browse Portuguese Atlantic history online.

The stack was Ruby on Rails, PostgreSQL, jQuery, and Elasticsearch.

The app is live at Atlântico Português.