Professional Experience - Full Cycle Freelancer (Own Products and Direct Clients)

About This Work

Since 2025, I have worked in parallel as a full cycle freelancer: commercial proposal → discovery → architecture → code → deploy → operation and support, as the sole developer. These are not study projects — they are systems in production, running real clients' day-to-day operations, with contracts, deadlines, and ongoing support.

Period: 2025 - Present | Remote

Systems in Production

AOG Dux Truck — Emergency Logistics Operations (in production)

System for AOG (aircraft on ground) operations — emergency parts logistics
Java 21 + Spring Boot 3 with Clean Architecture, Angular 20, Microsoft Entra ID authentication
Each demand has its own tracking screen with chat, operator/client comments, and a traceable event timeline — cutting email/phone follow-ups

NF-e Tax Automation (in production)

Invoice capture from email via Microsoft Graph with layered extraction: deterministic XML → PDF → OCR/AI only as fallback
FastAPI + React; eliminates manual invoice data entry in the client's fiscal workflow

Sol — Omnichannel IT Service Desk with AI (in production)

Support via WhatsApp, Teams, web platform, and email in a single hub
Satisfaction thermometer through AI conversation sampling, producing per-department verdicts and insights
Complete ticket management panel, automated reports, and an integrated CRM module (campaigns + WhatsApp contact capture)
FastAPI + Angular 20 + pgvector + Gemini + Evolution/Meta WhatsApp Cloud API

Qualtrics CX Dashboard (in production)

Customer experience dashboard by journey — FastAPI + Angular + Gemini
TypeScript MCP server for the Qualtrics API
Portable Windows desktop build (embedded Python + SQLite) with auto-update via GitHub Releases

Mercearia R&V — Offline-First Retail (in production)

Desktop inventory/sales/POS system: Electron orchestrating embedded Spring Boot + PostgreSQL in a single NSIS installer
POS, cash register, loyalty, PDF reports; daily use in the client's operation with zero recurring cost

Experimenta AI — Soneca (management in production; delivery built with Java 17 + Angular 20+, currently deactivated)

Complete snack bar management in production: counter, table ordering via QR code, self-service kiosk, and cross-platform ESC/POS receipt printing (Windows Spooler, direct USB, CUPS)
Own delivery ecosystem built with Java 17 + Angular 20+, currently deactivated: customer and courier PWAs, real-time tracking (GPS → TTL cache → Server-Sent Events), Google Maps Platform and Google OAuth
Java + Spring Boot multi-module (Clean Architecture) + Angular 17 + MySQL

In Homologation / One-Off Deliveries

Logistics Workflow Platform (complete, in homologation)

Replaces a corporate BPM (TOTVS Fluig style): typed requests, group queues, multi-step approvals, documents, SLAs, and dashboard
Java + Spring + Angular + PostgreSQL, deployed on an Oracle Cloud VPS

Frontend Renovation — EDI Logistics Integrator

Complete visual refactor of the frontend in Next.js 16 + React 19 + Tailwind 4

Batch Badge Generator (delivered)

Python tool packaged as an executable (PyInstaller) for a retail client (Supermercados Rio Sul), with browser-preview calibration

What This Experience Proves

Real full cycle: from the commercial proposal (including sales decks) to production operation
Polyglot: Java/Spring Clean Architecture, Python/FastAPI, Node, and the three major frontends (Angular, React, Vue)
Corporate integrations: Microsoft Entra ID, Microsoft Graph, Evolution API / Meta WhatsApp Cloud API, Teams, Qualtrics
Cost engineering: Linux VPS from the right provider for each size (Hostinger, Oracle Cloud Always Free, Contabo, KingHost — any Linux environment with SSH), desktop apps with embedded databases — the right infrastructure for each client's size
Products that stay live: clients operating daily on these systems, with ongoing support and evolution