2609 cases live — from Agency Inside
How I built this platform with AI — in days, not months
Zero AI API credits. No SaaS. Just a $20/month ChatGPT Pro subscription. From someone with 20 years of agency experience — the practical playbook for building faster than you thought possible.
€ 50–100k
A platform like this would have costed € 50-100k to build just 6 months ago.
With the right prompts, agents, and systems setup: days of work and a $20/month ChatGPT Pro subscription. Copy the exact setup from the guide →
Agency Inside — live numbers
2609
Published cases
120
Agencies
34
Platforms
12
Services
Runs on zero AI API credits — local models only. Built with a $20/month ChatGPT Pro subscription and no SaaS tools. A small team of agents, running every 10 minutes, around the clock.
The guide
Not theory. The actual system — copy it for your agency.
Agency Inside runs a fully automated content pipeline, a production-grade public site, and a complete internal backoffice — on zero AI API credits. Local models, a $20/month ChatGPT Pro subscription, and no SaaS tools. Built by someone with 20 years of agency experience who finally had the right tools to move fast.
If you run an agency and want to build client platforms, internal tools, or content operations at this speed — this is the exact playbook.
AI pipeline design
How to structure a multi-step content pipeline — fetch, extract, classify, rate, publish — using AI at each step.
Memory architecture that works
MEMORY.md, project memory, per-session context — the three-layer system that keeps AI consistent across weeks of work.
Coding agent workflows
How to delegate features to a coding agent: parallel agents, isolated worktrees, safe-migration patterns, and shipping without breaking things.
Content ops at scale
The pipeline that discovers, processes and publishes 30+ case studies per hour — automated from sitemap to live page.
Agency platform architecture
Two-app Flask monorepo (backoffice + public site), sync layer, taxonomy, and the decisions behind each choice.
Copy-paste templates
MEMORY.md starters, pipeline prompts, Flask blueprints, and cron patterns — all ready to adapt.
What's inside
01–02
The Foundation
Why building with AI is different from using AI. Platform setup, project structure, and the MEMORY.md that changes everything.
03–04
The Stack
The only tools that matter. A coding agent, Flask, SQLite to Postgres, Tailwind/DaisyUI — and why complexity is the enemy.
05–06
The Pipeline
Building a multi-step content pipeline with AI at every stage: discovery, extraction, classification, rating, and publish gating.
07–08
Coding Agents at Scale
Delegating whole features. Parallel agents, safe-migration branches, worktree isolation, and shipping without fear.
09–10
Agency Platform Patterns
Two-app architecture, sync layers, taxonomy design, and how to structure a backoffice that doesn't collapse under real usage.
11
Operations & Automation
Cron design, flock patterns, DB backups, notification pipelines, and keeping it running while you sleep.
12
Agency Use Cases
How to apply the same patterns to client work: briefing tools, content ops, campaign tracking, proposal automation.
13
Quick-Start Kit
Every config file, MEMORY.md template, pipeline prompt, and cron line — ready to copy and adapt today.
About the author
Sebastiaan van der Lans
20 years building digital products in the agency world. 2,500+ hours deep in AI tools — from early experiments to running production systems. Not a founder story: a builder who got tired of slow and expensive, and found a better way. Agency Inside is the proof of concept. This guide is the exact system behind it — documented while it was being built, not reconstructed after.
Live proof
Cases published per month
When the original agency work was published — across the last 12 months.
One-time purchase — yours forever
Build agency work in days — not months.
The full playbook: local models, coding agents, self-built pipelines, and the operating patterns that make it all run without a monthly bill.
PDF + templates. Instant delivery. Email seb@agencyinside.co to get yours.
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