FastAPI app built with Claude Code? Let’s review it.
Expert code review for FastAPI apps built with Claude Code. We find Claude Code-specific bugs, fix FastAPI security issues, and optimize performance. From $19.
Claude Code issues we find in FastAPI projects
Problems specific to Claude Code's code generation patterns when building FastAPI apps.
Over-permissive CORS configuration
Claude Code sometimes sets CORS to allow all origins during development and forgets to restrict it for production, allowing any website to make API requests.
Missing rate limiting
API endpoints are generated without rate limiting, allowing attackers to brute-force auth endpoints or abuse expensive operations.
Over-engineered abstractions
Claude Code creates multiple layers of abstraction, generic utilities, and design patterns for simple problems — making the code harder to understand and maintain.
Edge cases in complex logic
While Claude handles the main flow well, complex conditional logic sometimes has edge cases that produce incorrect results with unusual inputs.
FastAPI issues we check for
Common FastAPI problems that affect production readiness.
Blocking calls inside async endpoints
Synchronous database calls, file operations, or HTTP requests inside async def endpoints block the entire event loop, making your API unresponsive under load.
Missing authentication on endpoints
API routes that handle sensitive data or actions without any auth middleware — Depends() for authentication is simply not included in the route definition.
No CORS configuration
CORSMiddleware either missing (blocking all cross-origin requests) or set to allow_origins=['*'] (allowing any website to call your API).
Pydantic models without validation constraints
Request models that accept any string length, any number range, and any format. No Field() constraints, so invalid data flows through your system.
Start with a self-serve audit
Get a professional review of your Claude Code FastAPI project at a fixed price.
External Security Scan
Black-box review of your public-facing app. No code access needed.
- OWASP Top 10 vulnerability check
- SSL/TLS configuration analysis
- Security header assessment
- Expert review within 24h
Code Audit
In-depth review of your source code for security, quality, and best practices.
- Security vulnerability analysis
- Code quality review
- Dependency audit
- Architecture review
- Expert + AI code analysis
Complete Bundle
Both scans in one package with cross-referenced findings.
- Everything in both products
- Cross-referenced findings
- Unified action plan
100% credited toward any paid service. Start with an audit, then let us fix what we find.
Frequently asked questions
Can you review FastAPI code generated by Claude Code?
Yes. We regularly audit FastAPI projects built with Claude Code and understand the specific patterns and issues it introduces. Our review covers security, performance, and deployment readiness.
What FastAPI issues does Claude Code typically create?
Common issues in Claude Code-generated FastAPI code include: over-permissive cors configuration, missing rate limiting, over-engineered abstractions. Combined with FastAPI-specific concerns like blocking calls inside async endpoints and missing authentication on endpoints.
How do I make my Claude Code FastAPI project production-ready?
Start with our code audit ($19) to get a prioritized list of issues. For Claude Code-built FastAPI projects, the typical path is: fix security gaps, address FastAPI-specific performance issues, then configure deployment. We provide a fixed quote after the audit.
How much does it cost to review Claude Code-generated FastAPI code?
Our code audit starts at $19 and covers security, performance, architecture, and deployment readiness. For fixes, our Fix & Ship plan is $199. Larger projects get a custom fixed quote — no hourly billing or surprises.
Related resources
Need help with your Claude Code FastAPI project?
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