The Indie Founder Architecture Decision Intelligence Playbook
Make confident system design decisions without a senior engineer on call
Solo technical founders often make architecture decisions in a vacuum — picking the wrong data store, coupling services that should be separate, or missing security gaps that only appear at scale. This playbook gives you an AI-powered architecture review loop: diagram your system, get adversarial feedback, and generate documentation your future self or contractors can follow. Built for indie founders who are strong coders but don't have a staff engineer to sanity-check big calls.
Goal
Make defensible, documented architecture decisions without a senior engineering partner
Who this is for
Solo technical founders building SaaS or API products without a senior engineer
When to use
Before committing to a new data model, service boundary, or infrastructure choice
When NOT to use
For day-to-day feature implementation — this is for structural, hard-to-reverse decisions only
How to set it up
Diagram your proposed architecture
Open Composer and describe your system in plain English or paste your codebase. Generate a diagram of your proposed service boundaries, data stores, and integrations. Export it as your working document.
Run a decision coaching session
Take your top two or three architecture options into Bramble. Work through trade-offs on scalability, cost, and reversibility with structured AI coaching until you reach a confident decision.
Security-review the chosen design
Install Trent inside Claude Code and run a contextual security review against your chosen architecture diagram. Document every flagged threat and the mitigation you'll apply.
Generate living documentation
Connect Specsight to your codebase and generate the initial living spec from your architecture. Configure it to auto-update as you build so documentation never drifts from reality.
Log all AI-assisted decisions
Enable Selvedge as an MCP server in your coding environment. Every time an AI agent makes a structural change, Selvedge logs the reasoning locally so your decision trail is always intact.
Turn ideas and codebases into architecture diagrams
Turns your idea or existing codebase into clear architecture diagrams so you're reasoning about a concrete system, not an abstraction in your head.
Trent – Contextual architectural security reviews inside Claude Code
Runs contextual security analysis on your architecture inside Claude Code, surfacing threats and weak points before you write a line of implementation code.
Auto-generate living product specs from your codebase for PMs and stakeholders
Auto-generates and keeps product specs up to date from your codebase so your architecture decisions are always reflected in documentation contractors can act on.
Get coaching for hard conversations and decisions
Helps you think through the trade-offs of competing architectural choices with structured AI coaching before you commit.
Log the reasoning behind every AI-generated code change locally
Captures the reasoning behind every AI-assisted code change so your future self and contractors understand why the system is built the way it is.
Expected outcome
A reviewed architecture diagram, a security-annotated spec, and living documentation ready to hand to any contractor or AI coding agent
Related playbooks
The Indie Founder Codebase Handoff Playbook
Generate complete, up-to-date documentation and architecture from any codebase ready for handoff or onboarding
The Indie Founder Legacy Code Modernisation Playbook
Understand, document, and modernise a legacy codebase as a solo founder
The Indie Founder Codebase Archaeology Playbook
Turn an unknown, undocumented codebase into something you can confidently ship and extend
The Indie Founder Codebase-to-Living-Docs Playbook
Generate and maintain living technical and product documentation from your codebase automatically
Was this playbook useful?
This playbook is a curated starting point, not a definitive recommendation. Pricing and features change — always verify on each tool's official website. Tools marked "affiliate link" may earn this site a commission at no extra cost to you.