Thiago Sousa Santos

Summary

I am self-taught and always looking for new knowledge. I enjoy challenges, especially understanding the problem before jumping to a solution. I like to estimate and organize tasks and to set realistic deadlines. That keeps the work aligned with the team and lets development flow.

Today I am Tech Lead at RevGás, on fiscal and management systems for LPG resellers. Before that I was CTO at Expandr for six years, an edtech focused on student acquisition.

Experience

1. Tech Lead @ RevGás

   nov 2021 – present
   • Technical lead for the RevGás product, across the web ERP, Android apps and backend services. Joined as Systems Analyst.
   • Fiscal and management system for LPG resellers, focused on operational efficiency and compliance.
   • Requirements gathering with stakeholders, turned into technical specs and solutions.
   • Testing, validation, technical support and end-user training.

   Java · Spring Boot · Angular · Kotlin · Jetpack Compose · Python · Go · Rust · Tauri · AWS Lambda · AWS CDK · DynamoDB · MySQL

2. CTO @ Expandr

   jul 2018 – jun 2024
   • Technical lead for a student acquisition product for educational institutions.
   • Evolved the product from user feedback and analytics, with strategic planning alongside the team.

   PHP · Laminas · CakePHP · Doctrine · Ruby on Rails · Flutter · AWS · MySQL · Docker

3. Full stack developer @ Gerador de Matrículas

   jan 2018 – jun 2018
   • Built and maintained the CRM for educational institutions.
   • Managed AWS services and CI/CD pipelines for build, tests and deploy.

   PHP · JavaScript · WordPress · AWS · MariaDB

4. Programmer @ Flex Marketing Digital

   jan 2016 – dec 2017
   • Web applications and responsive interfaces for digital marketing campaigns.
   • Integrations with APIs and marketing automation tools.

   PHP · Zend Framework · CakePHP · WordPress · Mautic

5. Technical support @ Net Use System

   aug 2015 – dec 2015
   • Support tickets, workstation maintenance and user training on tax software.

   Delphi · Object Pascal

Selected projects

• RevGás ERP · web · TypeScript · 2019

  Web front end of the RevGás ERP, kept up to date from Angular 9 to 21. Angular Material, maps with deck.gl, SSR and PWA, Storybook, Vitest and Playwright.

• RevGás for Couriers · Kotlin · 2022

  Native Android app for delivery management. Kotlin, Jetpack Compose, Room, Koin and Firebase, with detekt, ktlint and a broad test suite.

• RevGás ERP · core · Java · 2021

  Fiscal and management system for LPG resellers, a Java monolith with Struts, Spring and Hibernate on AWS, plus new Spring Boot, Go and serverless services. Integrations with WhatsApp API, Twilio and Zendesk.

• Bina RevGás · Rust · 2026

  Desktop caller ID client that reads the phone line through the serial port. A rewrite in Rust and Tauri 2 of the old Java 8 client.

• CadiroVault · Ruby · 2026

  Path of Exile 2 trading companion in Rails 8.1. Syncs stash listings from the trade site, price-checks items, watches new drops in near real time and matches in-game buy offers to items. Invite-only, with passkeys and TOTP, Hotwire, Solid Queue and SQLite, deployed with Kamal.

• Certz · Ruby · 2026

  Event certificate platform in Rails 8.1. Events, participants imported from spreadsheets and PDF certificates rendered with Grover. Pundit authorization, passkeys and TOTP. A rewrite of the original Zend Framework version.

• gitops-local · Shell · 2026

  Local Kubernetes cluster managed with GitOps. ArgoCD, Kustomize, ingress and Postgres as a StatefulSet, with bootstrap scripts from scratch.

Skills

languages

TypeScript · Java · Kotlin · PHP · Ruby · Python · JavaScript · Go · Rust · GDScript · SQL

frontend

Angular · Angular Material · Hotwire · Tailwind CSS · Storybook · Vite · React · Livewire

backend

Ruby on Rails · Spring Boot · CakePHP · Laminas · Laravel · NestJS · Express · FastAPI · Flask · Struts 2

mobile & desktop

Android · Jetpack Compose · Room · Koin · Firebase · Tauri · Godot

data

MySQL · PostgreSQL · SQLite · DynamoDB · Redis · Prisma · Doctrine

infra

AWS Lambda · AWS CDK · S3 · SQS · CodeBuild · Serverless Framework · Docker · Kamal · Kubernetes · Argo CD · GitHub Actions · GitLab CI

testing

Playwright · Vitest · Jest · JUnit · PHPUnit · Capybara · GUT · k6

tools

zsh · Git · mise · pnpm · Rollbar · Twilio · WhatsApp API · Zendesk · Jira