Wellington Junior | Portfolio

Available for new projects

Full Stack Developer specialized in Django and PostgreSQL. I build production-ready web and mobile products, from architecture and secure backend services to responsive interfaces, automated testing, deployment, and production operations.

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Years in Software

Full

Product Lifecycle

Web +

Mobile Platforms

Skills

Full Stack Development, Web & Mobile Development, and AI-Assisted Workflows

2026

Django + Django REST Framework PostgreSQL + Backend Architecture Next.js + React + TypeScript React Native + Expo Docker + CI/CD + Testing LangChain + AI Agents

Next step

Let's transform your idea into a scalable, maintainable product designed for real-world use.

Available

Remote Web & Mobile Portuguese · English

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More information about my work and projects, coming soon.

Projects

Selected Recent Work

Recent web, mobile, backend, and AI projects built around scalable architecture and production-ready delivery.

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May 2026 - Present · Recovery Fullstack

Web & Mobile Recovery Platform

Sun of Justice supports structured recovery through reflections, challenges, mood tracking, recovery plans, support networks, and emergency workflows across web and mobile.

Django REST API Next.js React Native

Apr 2026 - Present · Operations Fullstack

Restoration Center Management Platform

A centralized platform replacing Excel workflows for client records, appointments, service plans, payments, notifications, and historical data.

Django DRF PostgreSQL

Nov - Dec 2025 · GenAI AI / RAG

Advanced RAG Chatbots with LangChain

Advanced chatbot pipelines covering document ingestion, semantic chunking, vector and hybrid retrieval, conversational memory, and response evaluation.

LangChain Gemini Vector Databases

Aug - Oct 2025 · Backend Microservice

Go Microservice Architecture

A production-oriented Go microservice exploring layered architecture, shared REST and gRPC services, PostgreSQL access, OpenAPI, and containerized delivery.

Go Gin / gRPC Sponge

Apr 2025 · Institutional Frontend

Maia Development Institutional Website

A responsive agency website presenting services, a multidisciplinary team, and client work through a modern interface with reusable components and scroll animations.

HTML5 Tailwind CSS Flowbite / AOS.js

Premium tools

Tools That Support My Projects

Django / DRF

Python

PostgreSQL

Golang

Docker / Nginx

TypeScript

LangChain / RAG

React / Next.js

React Native / Expo

Tailwind CSS

GitHub Actions / CI/CD

Notion

Experience

Timeline

Full Stack Developer · Self-employed

Independent product development · Mar 2023 - Present

Freelance

Own the complete product lifecycle, from requirements and domain modeling to architecture, implementation, deployment, and continuous evolution. Build secure REST APIs and business-critical services with Django, Django REST Framework, and PostgreSQL, including authentication, authorization, email verification, notifications, and performance optimization.
Develop cohesive web and cross-platform mobile experiences with Next.js, React, TypeScript, React Native, and Expo. Connect both clients to a shared backend while implementing protected routes, secure storage, navigation, push notifications, animations, and data visualization.
Prepare products for real-world operation through unit, integration, and end-to-end testing; Docker, Redis, Celery, Nginx, and GitHub Actions; plus CI/CD, security scanning, logging, monitoring, staging, and smoke tests. Orchestrate specialized AI agents and LangChain workflows to accelerate delivery and improve engineering quality.

Logistics · IKEA

Braga, Portugal · Jun 2017 - Feb 2023

Managed inventory and stock quality, product import and export, cost reduction, picking-process optimization, and Excel macros.

Django / DRF Next.js / React PostgreSQL React Native / Expo Docker / CI/CD LangChain / AI Agents

Tools & Methodology

How I Work

Engineering

Production-Ready Digital Products

Scalable architectures, secure REST APIs, authentication, and business-critical services with Django and Django REST Framework.
Relational data modeling and PostgreSQL optimization with performance, security, and maintainability built into the architecture.
Cohesive web and mobile experiences using Next.js, React, TypeScript, React Native, and Expo.
AI agent orchestration and LangChain-based workflows that accelerate delivery and improve software quality.

Stack

Python & Django Django REST Framework Next.js & React PostgreSQL React Native & Expo Docker, Redis & Celery Testing & CI/CD LangChain & AI Agents

Process

Discover & Architect

Translate business needs into clear requirements, domain models, and a scalable technical architecture.

Build & Validate

Develop the backend, web, and mobile experiences with automated unit, integration, and end-to-end testing.

Deploy & Evolve

Configure CI/CD, monitoring, logging, and production operations for reliable delivery and continuous product growth.