System Design

---
title: System Design Document Generator
category: development
tags: [system-design, architecture, scalability, infrastructure, design-doc]
difficulty: advanced
models: [claude, gpt-4, gemini, mistral]
---

# System Design Document Generator

Generate comprehensive system design documents from a set of requirements,
constraints, and scale expectations. The output covers high-level architecture,
component design, data flow, scalability strategy, and the trade-offs behind
each decision — ready for engineering review.

## When to Use

- Kicking off a new service or platform and need to align the team on architecture
- Preparing for a system design review or architecture decision record
- Documenting an existing system that was never formally designed on paper
- Evaluating trade-offs between competing approaches before committing to one
- Onboarding new engineers who need to understand how the pieces fit together

## The Technique

Provide the system name, functional and non-functional requirements, expected
scale (users, requests per second, data volume), and hard constraints such as
compliance rules, budget limits, or existing technology choices. The model
produces a structured design document that walks through each layer of the
system — from API surface to data storage — with explicit reasoning for every
decision.

The key is being specific about numbers. "Handle a lot of traffic" is useless.
"Handle 10,000 requests per second with p99 latency under 200ms" gives the
model enough to make real architecture choices.

## Template