backend▌

Use this skill when integrating BFL FLUX APIs into applications for image generation, editing, and processing.

Enterprise Java specialist for Spring Boot 3.x, microservices, and cloud-native development. \n \n Covers Spring Boot 3.x architecture, WebFlux reactive endpoints, Spring Data JPA optimization, and Spring Security with OAuth2/JWT configuration \n Enforces Java 21 LTS features, DDD/Clean Architecture principles, and comprehensive test coverage (85%+ target) with Maven/Gradle verification workflows \n Includes domain modeling, service layer design, repository patterns, and REST endpoint implementa

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Coding standards for readable, maintainable Java 17+ in Spring Boot services. \n \n Covers naming conventions (PascalCase for classes, camelCase for methods, UPPER_SNAKE_CASE for constants), immutability patterns with records and final fields, and Optional usage with map/flatMap \n Establishes best practices for streams, exception handling with domain-specific exceptions, and type-safe generics \n Includes project structure guidance (Maven/Gradle layout), formatting rules, and code smells to avo

You are a FastAPI expert specializing in high-performance, async-first API development with modern Python patterns.

Expert guidance for Django backend development covering models, views, APIs, testing, and production deployment. \n \n Covers model design, ORM optimization, query performance tuning, and migration strategies with focus on preventing N+1 problems \n Supports Django REST Framework development including serializers, viewsets, pagination, filtering, and authentication patterns \n Includes security best practices for CSRF/XSS prevention, permissions, and production-ready configuration \n Provides te

Comprehensive backend testing for REST APIs, databases, authentication, and business logic across Jest, Pytest, and Mocha. \n \n Covers unit tests for isolated functions, integration tests for API endpoints, and authentication/authorization flows with detailed examples for Express.js, FastAPI, and other frameworks \n Includes test environment setup, mocking strategies for external dependencies, and database isolation patterns using in-memory or separate test databases \n Provides step-by-step gu

Expert guidance for building high-performance FastAPI APIs with async best practices and clean Python patterns. \n \n Covers FastAPI fundamentals, Pydantic v2 validation, async/await patterns, and dependency injection for scalable backend development \n Emphasizes functional programming, early returns, guard clauses, and RORO (Receive an Object, Return an Object) pattern for maintainable code \n Includes error handling strategies, middleware design, caching optimization, and performance tuning f

FastAPI best practices and conventions for clean, modern API development. \n \n Use Annotated for all parameter and dependency declarations to maintain type safety, reusability, and compatibility with other contexts \n Declare return types or response models on path operations to enable automatic validation, filtering, serialization, and OpenAPI documentation \n Use async def only when calling async code with await ; default to regular def for blocking operations to avoid event loop blocking \n

Use this skill for backend and API work across web/, worker/, and packages/shared/.