MentorProfit

The product

MentorProfit is a chat platform with four AI mentors specialized in different personal-finance areas:

Mentor	Specialty
Criptobal	Crypto and blockchain
Casimiro	Real estate and mortgages
Empresandra	Entrepreneurship and business
Ahorristo	Savings and personal finance

Each character has its system prompt persisted in MongoDB, its suggested questions, avatar and color palette. My first OpenAI API integration in a real product.

Key decision: prompts in the database

Each mentor’s prompt is stored in MongoDB instead of being hardcoded. That allows the team to iterate the agent personalities live from the admin panel without touching code or redeploying. It’s a small decision with a big impact: the product owner can tweak tone, constraints and specialization of each mentor in minutes.

Architecture

mentorprofit-front/          mentorprofit-back/
├── pages/                   ├── controllers/
│   ├── Home/                │   ├── chatController.ts   ← calls OpenAI
│   ├── Chat/                │   └── characterController.ts
│   ├── About/               ├── models/
│   └── Admin/               │   ├── Character.ts
└── components/              │   └── Message.ts
                             └── routes/

Features

• Contextualized chat — POST /api/chat/message takes the character’s prompt and sends it to gpt-4o-mini.
• Character selector — circular avatars with dynamic routing /chat/:name.
• Suggested questions — per-character shortcuts when the history is empty.
• AdBlock detection with an informational screen.
• Google AdSense ads in sidebar and pop-up every 3 messages.
• Cookie consent banner on entry.
• Protected admin panel with character + prompt CRUD.
• Rate limiting to protect the OpenAI API from abuse.

Takeaways

• First OpenAI API integration using gpt-4o-mini with dynamic system prompts from MongoDB.
• Architecture of “configurable agents” — the prompt lives in data, not in code.
• Monetization with Google AdSense and AdBlock detection.
• First use of Framer Motion for fluid animations in the chat.
• Deployed to production under its own domain (mentorprofit.com).