Build Your First Real AI Agent in 5 Days

A hands-on challenge for developers who want to stop watching AI tutorials and start building real systems with code.

Build an AI agent step by step using TypeScript and the Gemini API
Learn the foundations behind prompts, retrieval, and grounded responses
Finish with code you can keep, extend, and put on GitHub

Stop being an AI spectator.
Become the developer who can actually build it.

Most developers are still stuck consuming AI through chat interfaces, tutorials, and copied examples. Meanwhile, the real leverage goes to the people who know how to turn models into useful software — with structured prompts, grounded context, and working application logic.

The 5-Day Build Roadmap

Each day, you’ll build one part of a real AI system and understand why it works.

DAY 1

From Chat User to AI Developer

Make your first programmatic LLM call with the Gemini API and move from using AI tools to building with them in code.

DAY 2

Control the Agent

Use system prompts and structure to turn a generic chatbot into a focused AI advisor with a clear role and behavior.

DAY 3

Give It Memory with RAG

Implement a simple retrieval workflow so your agent can answer from source material instead of making things up.

DAY 4

Ground It in Real Data

Pull in YouTube transcripts as context so your agent can become useful on a real topic instead of just sounding smart.

DAY 5

See What Real AI Products Look Like

Connect what you built to production-style systems, see how these ideas scale, and understand what to learn next if you want to go deeper.

What you’ll walk away with

This is not a theory challenge. By the end, you’ll have a real foundation you can build on.

A working AI agent you built yourself
A practical understanding of prompts, retrieval, and grounded answers
Code you can keep, extend, and use in your own projects
A much clearer picture of what AI engineering actually looks like in practice

The No-Fluff Stack

Language: TypeScript

Framework: Next.js 15

Model API: Google Gemini API (free tier available)

Approach: Minimal abstractions, clear logic, and no black-box magic

Best fit for: Developers who know basic JavaScript and want practical AI experience

Spend the next 5 days building instead of just reading about AI

If you’ve been meaning to get hands-on with AI but want a clear path, this is the easiest place to start. You’ll get a focused challenge, practical code, and a much better mental model for how modern AI apps actually work.

Instant access: Start right away

Keep the code: Everything you build is yours

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