Available for new projects
Photo of Wellington Junior

Full-Stack Developer with strong backend expertise in Go and Python. I build scalable web applications, design relational databases with PostgreSQL, and develop AI-driven systems using LangChain and RAG. I focus on clean architecture, performance, and building well-structured, production-ready solutions.

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+04

Years Building

+30

Frontend/Backend Projects

+12

Premium Tools

Skills

Backend Development, Python (Django), RESTful API Design, PostgreSQL, and AI Systems

2026
Python/Django + RESTful API PostgreSQL
Database Golang
(Sponge) AI & Intelligent Systems
(LangChain) Retrieval Augmented Generation Front End
(TailwindCss/
Javascript)

Next step

Invite me to structure APIs, automations, or vertical agents that solve day-to-day pain points.

Available
Remote Portugal Time Zone / GMT Portuguese · English

Newsletter

Write to me

More information about my work and projects, coming soon.

Projects

Selected Recent Work

Django/Python/Go backend, RAG/AI, and Tailwind/JavaScript front end to deliver end-to-end products.

Academic portal
2025 · Education Fullstack

Academic Portal for Students

Grades, attendance, resources, calendars, and announcements in a responsive dashboard, with a premium area and secure authentication.

Python Django Tailwind
UI Composer
2025 · SaaS Backend

Flutter UI Composer (low-code)

Declarative platform to compose Flutter interfaces and generate code automatically, with a Go backend and Postgres persistence.

Golang Sponge PostgreSQL
Community website
2025 · Institutional Frontend

Website for Community/Church

Informational website with location, departments, schedule, resources, and financial transparency, built with Tailwind + JavaScript.

TailwindCSS JavaScript
AI Agent for Documents
2025 · Backend AI Agent

AI Agent for Documents

AI agent using OpenAI API + LangChain/RAG that reads PDFs and TXT files, extracting and organizing data based on client requirements.

Python LangChain OpenAI API
Notion Operational Playbook
2024 · Operations AI / No-Code

Operational Playbook with Notion + Automations

Robust Notion template for sales, finance, and productivity; low-code automations, external integrations, and RAG workflows to organize information.

Notion Automations Integrations
Premium tools

Tools That Support My Projects

Python
Python
Django
Django
Golang
Golang
PostgreSQL
PostgreSQL
JavaScript
JavaScript
Tailwind CSS
Tailwind CSS
React
React
LangChain
Cursor / Dev Agents
OpenAI
OpenAI / Gemini
LangChain
LangChain / RAG
LangChain
GitHub Actions
Notion
Notion
Experience

Timeline

Full-Stack / Backend / AI Developer · Remote

Consulting and independent projects · 2022 - Present

Freelance
  • Python/Django and Go backends with PostgreSQL, queues, and product integrations.
  • RAG, LangChain, and automations with OpenAI/Gemini for support, catalogs, and code oversight.
  • Front end with Tailwind/JavaScript, plus project documentation and team management in Notion.

Before

Web development · 2021 - 2022

Built interfaces with Tailwind, CSS, JavaScript, and React, collaborating with Python/Django backend teams.

Python / Django Go PostgreSQL Tailwind / JavaScript LangChain / RAG Notion
Tools & Methodology

How I Work

Services

APIs, Automation, and Agents

  • Development of scalable APIs in Go and Python (Django), focused on performance, project structure, and strong architecture practices.
  • Modeling and optimization of PostgreSQL databases, applying integrity, normalization, and query efficiency principles.
  • Building AI agents with LangChain and RAG, integrating models such as ChatGPT/Gemini for process automation, intelligent support, and knowledge-based systems.
  • Development of modern interfaces with React and Tailwind CSS, connected to robust API-oriented backends.

Stack

Python & Django RESTful API Golang & Sponge PostgreSQL LangChain & RAG Tailwind CSS & JavaScript AI Agents (LLMs) Notion (Project Organization)

Process

1

Kickoff and Direction

Clear definition of technical goals, functional requirements, and success criteria, with architecture alignment from the start.

2

Design & Validate

Service design, database structuring, and proof-of-concept (POC) development, including tests with real data and performance validation.

3

Handoff

Implementation of production-ready APIs, agents, and interfaces, with organized technical documentation and a focus on maintainability.