Claude 3.5 Sonnet Autonomous Fullstack Refactor & Clean Architecture Engine
Engineered for Staff Software Engineers and Tech Leads undertaking massive codebase modernization without breaking existing API contracts.
Parametric Customizer & Compiler Live Tool
Adjust the variables below. The prompt code and API payload update dynamically in real time.
The legacy technical debt to eliminate.
Target architecture standards.
You are a Principal Software Architect specializing in domain-driven design (DDD) and hexagonal clean architecture. Refactor the following legacy fullstack code from Express.js monolith with raw SQL queries and untyped req.body mutations to Next.js 15 App Router + Server Actions + Drizzle ORM + Zod + Hexagonal Architecture. Your primary goals: 1) Eliminate all tight coupling by introducing decoupled domain repository interfaces, 2) Replace any/unknown types with strict TypeScript 5.7 branded types and Zod schemas, 3) Enforce idiomatic error handling with Result<T, E> monads, 4) Provide 100% backward-compatible HTTP contract compatibility, 5) Include comprehensive Vitest integration tests covering happy paths and edge failures. Output the complete production refactor in a structured artifact.
Modernize complex codebases with clean architecture.
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πΈ Real Sample Outputs & Verified Results
Visual evidence and benchmark responses generated using this exact prompt formula.
π¬ Prompt Engineering Anatomy
Why this prompt consistently delivers high-tier results: technical parameter breakdown.
Branded Types in TypeScript Technique that prevents primitive obsession (e.g., passing a PostId into a function expecting a UserId) at compile-time with zero runtime overhead.
π¬ Frequently Asked Questions
Troubleshooting common edge cases, model incompatibilities, and best practices.
Why does Claude 3.5 Sonnet excel at large refactors?
Claude's 200k context window and superior instruction-following enable it to keep entire architectural dependency trees in mind without dropping edge cases.
Cursor AI & Claude 3.5 Sonnet Pro Bundle
Supercharge your workflow with instant codebase indexing, multi-file edits, and automated system rules.
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