Co_
Technology stack
Systems Framework Dec 29, 2025 9 min read

Building Your AI Stack: A Practical Framework

DZ
Dietrich Zeledon
Founder, Co_

Every vendor wants to sell you their "AI platform." Most businesses don't need a platform—they need the right tools, connected sensibly, with clear ownership. Here's how to think about building an AI stack that actually works.

Data infrastructure
Section 01

The Four Layers

Every AI stack has four layers. You need all four, but the right solution for each layer depends on your specific situation:

  • 01.Data Layer: Where your data lives, how it's organized, and how you access it.
  • 02.Intelligence Layer: The AI models and algorithms that process your data.
  • 03.Integration Layer: How AI connects to your existing systems and workflows.
  • 04.Interface Layer: How humans interact with AI outputs and make decisions.
System Insight_

"Most AI failures happen at the integration and interface layers—not the intelligence layer. Getting AI to work is easy. Getting people to use AI outputs to make better decisions is hard."

// Don't over-invest in models while under-investing in adoption.

Section 02

Layer by Layer

Let's break down what you need at each layer:

Layer 1 Data Layer

For most local businesses: You don't need a data warehouse. You need clean exports from your existing systems (POS, CRM, booking software) into a structured format.

Practical options: Google Sheets for simple cases, Airtable for more structure, PostgreSQL if you're technical, or direct API connections to your tools.
Layer 2 Intelligence Layer

Don't build custom models. Use existing services. OpenAI, Anthropic, or Google Cloud AI handle 90% of use cases better than anything you'd build yourself.

Practical options: GPT-4 for text analysis and generation, Google Cloud Vision for images, pre-built classification models for structured predictions.
Layer 3 Integration Layer

This is where most businesses need help. Connecting AI outputs to your existing tools—updating your CRM, sending the right message, triggering the right workflow.

Practical options: Zapier for simple workflows, Make (Integromat) for complex ones, custom scripts for high-volume operations.
Layer 4 Interface Layer

The best interface is often no interface—AI works in the background, surfacing insights in tools people already use. When you need a UI, keep it dead simple.

Practical options: Slack or Teams notifications, email digests, embedded dashboards in existing tools, or lightweight custom dashboards.
Section 03

Common Mistakes

Avoid these expensive mistakes:

×Building Before Buying

Custom AI is rarely necessary. The best solution is usually stitching together existing services with light customization.

×Data Lake Fantasy

"Let's centralize all our data first" is a multi-year project that delays value. Start with specific use cases and specific data.

×Ignoring Maintenance

AI systems drift. Models degrade. Integrations break. Budget ongoing maintenance from day one, not as an afterthought.

×Vendor Lock-In

Keep your data portable. Own your integrations. Be able to swap out any layer without rebuilding everything else.

Section 04

The Right Sequence

Build your stack in this order:

  • 01.Start with one use case: What's the most painful problem AI could solve? Focus there.
  • 02.Identify the data you need: What data feeds that use case? How do you access it?
  • 03.Prototype with manual steps: Can a human + AI API solve this? Test before automating.
  • 04.Automate what works: Build integrations only after you've validated the approach.
  • 05.Expand from proven foundation: Next use case builds on infrastructure you've already validated.

Your stack should grow organically from real needs—not from a architecture diagram someone drew in a planning session.

Ready?

Let's design your AI stack together.