Documentation reference
Technical Architecture
A technical architecture document turns product requirements into a buildable system plan. It defines application layers, services, data model, APIs, integrations, infrastructure, security, observability, and tradeoffs.
Overview
What this document is
A technical architecture document turns product requirements into a buildable system plan. It defines application layers, services, data model, APIs, integrations, infrastructure, security, observability, and tradeoffs.
Fit signals
When to use it
- The PRD is clear enough to evaluate engineering approach.
- The product has integrations, AI workflows, permissions, or data complexity.
- Engineering estimates need assumptions and constraints documented.
- The team must decide what to build now versus later.
Audience and ownership
Who uses it
Founders, CTOs, technical leads, engineers, and agencies preparing a product for production-grade implementation.
Before and after
Where it fits in the build chain
Gather before writing
Inputs required
- Architecture decision record template
- Data model checklist
- Integration map
- Security and observability checklist
Core contents
Recommended structure
- System context and architecture diagram
- Frontend, backend, database, API, and service boundaries
- Data model, permissions, and integration plan
- Security, scalability, observability, and failure states
- Engineering risks, tradeoffs, and phased roadmap
What each part should cover
Section-by-section guide
System context
Describe the system context clearly enough that a founder, teammate, or AI agent can use it without needing hidden context.
Data model
Define the technical or structural decisions that prevent ambiguity during implementation.
APIs
Define the technical or structural decisions that prevent ambiguity during implementation.
Integrations
Describe the integrations clearly enough that a founder, teammate, or AI agent can use it without needing hidden context.
Security
Describe the security clearly enough that a founder, teammate, or AI agent can use it without needing hidden context.
Roadmap
Describe the roadmap clearly enough that a founder, teammate, or AI agent can use it without needing hidden context.
Practical workflow
How to create and use it
- 01Review PRD, workflows, roles, data, and integrations.
- 02Define architecture options and tradeoffs.
- 03Map entities, permissions, APIs, jobs, and infrastructure.
- 04Use the architecture doc to guide SOW, sprint planning, and AI-agent briefs.
Copy into your workspace
Starter template
- 01Map product workflows into system responsibilities.
- 02Define services, entities, APIs, jobs, integrations, and permissions.
- 03Document security, observability, deployment, and risks.
- 04Phase the architecture into MVP and production hardening.
Make the draft usable
Weak vs strong examples
System boundary
Weak
Use a backend and database.
Strong
Use Next.js for web, Supabase Postgres for workspace data, object storage for uploads, and queue-backed workers for OCR and AI extraction jobs.
Tradeoff
Weak
Make it scalable.
Strong
Keep workflow automation synchronous for MVP approvals, but move document parsing and risk scoring to async jobs to prevent slow uploads and failed requests.
How to know it is useful
Quality checklist
- 01Engineers can identify major services, data, APIs, and dependencies.
- 02Tradeoffs and assumptions are documented.
- 03Security, permissions, and failure states are considered.
- 04The architecture maps clearly to product scope and delivery phases.
Before you hand it off
Document readiness checklist
- The technical architecture has a named owner and approval path.
- The business or product decision this document supports is explicit.
- Inputs, assumptions, and open questions are separated from confirmed facts.
- Scope boundaries and non-goals are clear enough to prevent silent expansion.
- The document can be handed to a teammate, agency, or AI agent without hidden context.
- Engineers can identify major services, data, APIs, and dependencies.
- Tradeoffs and assumptions are documented.
- Security, permissions, and failure states are considered.
Generate the first draft
AI prompt
Create a technical architecture document for this product. Include system context, architecture diagram, frontend/backend boundaries, data model, APIs, background jobs, integrations, auth and permissions, security, observability, deployment, scalability, risks, tradeoffs, and implementation phases.
Avoid these
Common mistakes
- Choosing tools before understanding product constraints.
- Ignoring permissions, audit logs, and data retention.
- No integration failure or background job strategy.
- Over-engineering scale before proving the workflow.
Use this after the draft
Handoff assets
- System diagram
- Data and API model
- Integration assumptions
- Engineering roadmap and risk register
Suggested build path
What to create before and after
Before
Design System
Keep this connected so the build stays traceable.
Current
Architecture
Use this page to create the working draft.
After
SOW
Keep this connected so the build stays traceable.
Zenith CTA
Need this shaped for your business?
Zenith can turn rough notes into a founder-ready technical architecture.
Bring your idea, current docs, users, constraints, and open questions. We will help make the next decision clear.