Photo of Jonas Messias

Jonas Messias

Full Stack Developer

I build and maintain products in production with React, Node.js, Angular and Java, from API to interface, with tests, continuous deployment and AI as support.

Caratinga, Brazil

See projectsGitHub (opens in a new tab)Résumé (opens in a new tab)

About

I'm a full stack developer with a degree in Computer Science and experience building and evolving digital products in production. Today I'm the only engineer on an education platform: I built the Node.js and NestJS API, the three React apps and billing for Brazil and abroad.

Day to day I work with TypeScript, Node.js, NestJS, React and PostgreSQL. In my own projects, I built a REST API in Java 17 with Spring Boot and the Angular front end that consumes it, plus a store built with React microfrontends.

I work with automated tests, code review and continuous deployment, and I use AI coding agents, such as Claude Code, to support analysis, implementation and review, always reviewing the result. I'm looking for a team where I can grow through code review and contribute from day one.

Education
  • B.Sc. in Computer Science · Rede de Ensino Doctum · completed in March 2026
Languages
  • Portuguese · native
  • English · intermediate
  • Spanish · basic

Experience

  1. since (present)

    Remote

    Software Engineer

    oSeuMáximo

    I'm the only engineer on the product: I designed, built and keep in production the oSeuMáximo education platform, from the NestJS API to the three React apps. I built billing with PIX, installments and foreign-currency subscriptions, made sure paying customers never lost access, protected revenue against defaults and chargebacks, and created assisted sales through WhatsApp. I also refactored the checkout with AI agents, from 994 to 184 lines in 6 tested PRs.

    • TypeScript
    • Node.js
    • NestJS
    • Fastify
    • Prisma
    • PostgreSQL
    • Redis
    • BullMQ
    • React 19
    • Next.js
    • Vite
    • Tailwind CSS
    • shadcn/ui
    • Zustand
    • TanStack Query
    • Zod
    • Jest
    • Vitest
    • React Testing Library
    • Cypress
    • Docker
    • GitHub Actions
    • Sentry
    • Stripe
    • AWS S3
    • Resend

  2. to

    Caratinga, Brazil · hybrid

    Front-End Developer

    Agio

    I worked in a team with code review, refinement and planning. I led 2 projects from start to delivery, including the front-end and integrations of a React Native app with Expo, and used AI to meet tight client deadlines.

    • React
    • Next.js
    • React Native
    • Expo
    • TypeScript
    • Tailwind CSS
    • shadcn/ui
    • Zustand
    • React Query
    • Zod
    • Jest
    • Vitest
    • PostgreSQL

  3. to

    Caratinga, Brazil · on site

    Programmer Analyst

    Versatec

    I delivered more than 10 WordPress websites, with PHP integrations, for local clients.

    • WordPress
    • PHP
    • JavaScript
    • jQuery
    • HTML
    • CSS
    • MySQL

Stack

  • Languages

    • TypeScript
    • JavaScript
    • Java
    • SQL

  • Front-end

    • React
    • Next.js
    • Angular
    • Vite
    • Tailwind CSS
    • shadcn/ui
    • Zustand
    • TanStack Query
    • React Native

  • Back-end

    • Node.js
    • NestJS
    • Fastify
    • Spring Boot
    • Prisma
    • Zod

  • Data

    • PostgreSQL
    • Redis
    • BullMQ

  • Infra

    • Docker
    • GitHub Actions
    • AWS EC2
    • AWS RDS
    • AWS S3
    • AWS SES
    • Sentry
    • Vercel

  • Testing

    • Vitest
    • Jest
    • Testing Library
    • Cypress

  • AI agents

    • Claude Code

  • Studying

    • PHP
    • Laravel

Projects

  • In production · private code

    oSeuMáximo

    An education ecosystem in production: a study platform, a live-class scheduler and an admin panel, all on the same API. It has payments with Stripe and InfinitePay, single sign-on across both sites and AI-generated flashcards.

    • TypeScript
    • NestJS
    • React 19
    • Vite
    • PostgreSQL
    • Prisma
    • Redis
    • BullMQ
    • Tailwind CSS
    • shadcn/ui
    • TanStack Query
    • Zustand
    • Stripe
    • Docker
    • GitHub Actions
    • Sentry
    • Jest
    • Vitest

  • react-microfrontend

    An online store split into microfrontends (storefront, catalog and cart) that load at runtime and deploy separately. The parts talk through events instead of importing each other, and share a design system.

    • React 18
    • TypeScript
    • Webpack 5
    • Module Federation
    • Turborepo
    • Zustand
    • Tailwind CSS
    • Jest
    • GitHub Actions

  • spring-task-manager-api

    Study

    API for a Kanban-style task system, with JWT or Google login, refresh tokens in Redis and emails through AWS SES. It ran on an EC2 instance with an RDS database and automatic deploys from GitHub Actions.

    • Java 17
    • Spring Boot 3.5
    • Spring Data JPA
    • PostgreSQL
    • Redis
    • OAuth 2.0
    • AWS EC2
    • AWS RDS
    • AWS S3
    • AWS SES
    • Docker
    • GitHub Actions

  • angular-task-manager

    Study

    The Kanban front-end in Angular 20, without Zone.js and with state in Signals, using the API above. Sessions renew themselves: an interceptor swaps the expired token and retries the request.

    • Angular 20
    • TypeScript
    • Signals
    • RxJS
    • Angular CDK
    • Tailwind CSS

  • transacoes-simplificado

    Study

    A transfers API between users and merchants. Each transfer runs in a single transaction: it checks the balance, asks an external authorizer and notifies both sides.

    • Java 21
    • Spring Boot 4.1
    • Spring Data JPA
    • PostgreSQL
    • OpenFeign
    • Docker

  • aprocama

    Private code

    An institutional website with a blog written in Markdown and rendered on the server with Next.js. The contact form is validated with Zod and sent by email.

    • Next.js 15
    • React 19
    • TypeScript
    • Tailwind CSS
    • React Hook Form
    • Zod
More on GitHub (opens in a new tab)

How this site reaches you

  1. Commit

    I write the change and push it to GitHub.

  2. Checks

    GitHub checks types, lint, build and links.

  3. Deploy

    GitHub builds the Docker image, and my server pulls the new version and publishes it.

  4. You

    The site opens in your language.

Contact