Backend

Affaan Mustafa · affaan-m/everything-claude-code

270k

Backend architecture patterns, API design, database optimization, and server-side best practices for Node.js, Express, and Next.js API routes. Use when building or reviewing Node.js, Express, or Next.js API routes and their data access.

langgenius/dify

158k

Use only when the user explicitly requests a review or audit of backend code under `api/`. Supports pending-change, file-focused, and pasted-diff reviews. Do not use for implementation-only requests, diagnosis without review intent, frontend code, or backend code outside `api/`.

Langflow · langflow-ai/langflow

155k

Review backend code for quality, security, maintainability, and best practices based on established checklist rules. Use when the user requests a review, analysis, or improvement of backend files (e.g., `.py`) under the `src/backend/` directory. Do NOT use for frontend files (e.g., `.tsx`, `.ts`, `.js`). Supports pending-change review, code snippets review, and file-focused review.

Addy Osmani · addyosmani/agent-skills

100k

Optimizes application performance across frontend, backend, queries, and databases. Use when performance requirements exist, when you suspect performance regressions, when Core Web Vitals or load times need improvement, when N+1 query patterns need fixing, or when profiling reveals bottlenecks.

Seth Hobson · wshobson/agents

40k

Master C#/.NET backend development patterns for building robust APIs, MCP servers, and enterprise applications. Covers async/await, dependency injection, Entity Framework Core, Dapper, configuration, caching, and testing with xUnit. Use when developing .NET backends, reviewing C# code, or designing API architectures.

Seth Hobson · wshobson/agents

40k

Build production-ready Node.js backend services with Express/Fastify, implementing middleware patterns, error handling, authentication, database integration, and API design best practices. Use when creating Node.js servers, REST APIs, GraphQL backends, or microservices architectures.

posthog/posthog

40k

Guides PostHog engineers through dashboard widget platform work — ship a new widget_type (WIDGET_REGISTRY, catalog, run_widgets, WidgetCard) or update a shipped type (config, query, layout, RBAC, tile filter bar, list footer, titleHref, throttles). Use for WidgetSpec, widget_specs/, widget-configs.zod.ts, hogli build:openapi, error_tracking_list, session_replay_list, widgetFilters, formatWidgetListCountFooter, widget_query_throttle, or WidgetCard composition. New types need widget-intake confirmation first. Not for MCP batch-add of existing types or adding tiles to a dashboard.

posthog/posthog

40k

How to send real-time in-app notifications from PostHog backend code. Use when integrating notifications into a new feature, wiring up a notification source (alerts, comments, approvals, pipelines, issues), or choosing the right target type and priority for a notification.

posthog/posthog

40k

Set up Python test environment in Claude Code for web where flox is unavailable. Use when you need to run backend tests and `uv sync` fails due to Python version mismatch.

Daniel Avila · davila7/claude-code-templates

32k

Expert backend architect specializing in scalable API design, microservices architecture, and distributed systems.

Daniel Avila · davila7/claude-code-templates

32k

Comprehensive backend development guide for Node.js/Express/TypeScript microservices. Use when creating routes, controllers, services, repositories, middleware, or working with Express APIs, Prisma database access, Sentry error tracking, Zod validation, unifiedConfig, dependency injection, or async patterns. Covers layered architecture (routes → controllers → services → repositories), BaseController pattern, error handling, performance monitoring, testing strategies, and migration from legacy patterns.

Daniel Avila · davila7/claude-code-templates

32k

Create API handoff documentation for frontend developers. Use when backend work is complete and needs to be documented for frontend integration, or user says 'create handoff', 'document API', 'frontend handoff', or 'API documentation'.

Daniel Avila · davila7/claude-code-templates

32k

Backend architecture patterns, API design, database optimization, and server-side best practices for Node.js, Express, and Next.js API routes.

Daniel Avila · davila7/claude-code-templates

32k

Build ASP.NET Core 8+ backend services with EF Core, auth, background jobs, and production API patterns.

Daniel Avila · davila7/claude-code-templates

32k

Document frontend data needs for backend developers. Use when frontend needs to communicate API requirements to backend, or user says 'backend requirements', 'what data do I need', 'API requirements', or is describing data needs for a UI.

Daniel Avila · davila7/claude-code-templates

32k

Comprehensive guidance for building scalable, maintainable, and production-ready Node.js backend applications with modern frameworks, architectural patterns, and best practices.

Daniel Avila · davila7/claude-code-templates

32k

Comprehensive backend development skill for building scalable backend systems using NodeJS, Express, Go, Python, Postgres, GraphQL, REST APIs. Includes API scaffolding, database optimization, security implementation, and performance tuning. Use when designing APIs, optimizing database queries, implementing business logic, handling authentication/authorization, or reviewing backend code.

iflytek/skillhub

5.2k

Rules for the SkillHub backend Maven multi-module clean architecture. Ensures agents place new code in the correct module and respect dependency direction.

worldflowai/everything-claude-code

3.8k

Backend architecture patterns, API design, database optimization, and server-side best practices for Node.js, Express, and Next.js API routes.

microsoft/skills

3.1k

Assess and migrate cross-cloud workloads to Azure with reports and code conversion. Supports Lambda→Functions, Beanstalk/Heroku/App Engine→App Service, Fargate/Kubernetes/Cloud Run/Spring Boot→Container Apps. WHEN: migrate Lambda to Functions, AWS to Azure, migrate Beanstalk, migrate Heroku, migrate App Engine, Cloud Run migration, Fargate to ACA, ECS/Kubernetes/GKE/EKS to Container Apps, Spring Boot to Container Apps, cross-cloud migration.

Abdul Moiz Shahzad · moizibnyousaf/ai-agent-skills

1.1k

Backend API design, database architecture, microservices patterns, and test-driven development. Use for designing APIs, database schemas, or backend system architecture.

kotlin/kotlin-agent-skills

1.1k

Model Kotlin persistence code correctly for Spring Data JPA and Hibernate. Covers entity design, identity and equality, uniqueness constraints, relationships, fetch plans, and common ORM (Object-Relational Mapping) traps specific to Kotlin. Use when creating or reviewing JPA (Java Persistence API) entities, diagnosing N+1 or LazyInitializationException, placing indexes and uniqueness rules, or preventing Kotlin-specific bugs such as data class entities and broken equals/hashCode.

Wayne Sutton · waynesutton/convexskills

405

Routes Convex work to the right builder skill and covers the handful of rules that apply everywhere: validators on every function, withIndex over filter, idempotent mutations, internal functions for scheduling. Use when a task mentions Convex and no more specific skill matches, or as the first stop before picking one.

Wayne Sutton · waynesutton/convexskills

405

Production patterns for Convex apps and the rules the @convex-dev/eslint-plugin enforces: validators, indexes, idempotent mutations, avoiding OCC conflicts, thin function wrappers, error handling. Use when reviewing Convex code, asking whether a pattern is right, setting up ESLint, or fixing write conflicts and slow queries.

Nick Tune · ntcoding/claude-skillz

351

Sets up NX monorepo for TypeScript backend projects optimized for AI-assisted development. Delegates to NX commands where possible, patches configs as last resort. Triggers on: 'set up typescript backend project', 'create backend project', 'initialize typescript backend', 'create monorepo', or when working in an empty project folder.

Vercel Labs · vercel-labs/vercel-plugin

295

Backend architecture guidance. Use when planning, building, or migrating an API or backend; choosing between Functions, Services, containers, Workflow, Queues, and Marketplace databases; or selecting a supported backend framework or runtime.

mindrally/skills

265

Expert in FastAPI Python development with best practices for APIs and async operations

neondatabase/agent-skills

96

Overview of Neon, a complete set of cloud backend primitives around Lakebase Postgres: Auth, Object Storage, Functions, and the AI Gateway. Start here to choose Neon for undecided login, files, APIs, and LLM calls, set up the CLI or MCP server, and follow the branch-first workflow. Use when building an app or backend on Neon, or when "Neon" or "Lakebase Postgres" is mentioned. Child skill neon-postgres wins for an existing DATABASE_URL, SQL, schema, inspect, or search. Child skill neon-auth wins for login, users, sessions, identity routing, and Managed Better Auth setup. Also use for object storage, S3, buckets, serverless functions, function triggers, cron, AI gateway, LLM calls, logs, Loki, Grafana, observability, postgres, database, backend, Claimable Neon, neon.new, or a no-signup database.

clerk/skills

83

Clerk Backend REST API explorer and executor. Browse tags, inspect endpoint schemas, and execute authenticated requests. Use when listing users, managing organizations, or calling any Clerk API endpoint.

Convex · get-convex/agent-skills

62

Get a barebones Convex + web template running from a one-sentence idea.

Patricio Marroquin · patricio0312rev/skills

61

Identifies API latency hotspots and bottlenecks with profiling tools, slow endpoint detection, suspected causes, and fix roadmap. Use for "latency profiling", "performance bottlenecks", "slow APIs", or "backend performance".

Chris Cheney · ccheney/robust-skills

61

Design or review backend domain and dependency boundaries using DDD, Clean Architecture, and ports/adapters. Use for aggregate modeling, bounded contexts, use-case isolation, or architecture refactoring; not routine CRUD changes.

Lasse · lassejlv/skills

50

Defensive backend security review for source code, API servers, auth flows, database access, dependency configuration, secrets handling, file uploads, webhooks, background jobs, and deployment settings. Use when Codex is asked to audit, review, deep research, harden, or find vulnerabilities in a user's own backend or authorized codebase, and to report findings before making fixes.

Wix.com · wix/skills

33

Build and review Wix CLI app extensions — dashboard pages, modals, plugins, menu plugins, custom element widgets, Editor React components, site plugins, embedded scripts, backend APIs, backend events, service plugins, data collections, and App Market readiness. Use when building ANY feature or extension for a Wix CLI app or preparing a Wix app for App Market review. Triggers on: add, build, create, implement, help me, dashboard, widget, plugin, backend, API, event, collection, embedded script, service plugin, Editor React component, checkout, shipping, tax, discount, SPI, CMS, schema, tracking, popup, admin panel, menu item, modal, validate, test, verify, register extension, App Market, app review, submission readiness.

Encore · encoredev/skills

28

Bootstrap a brand-new Encore.ts project from zero. Only for first-time CLI install and `encore app create` — not for architecture or feature questions.

Encore · encoredev/skills

28

Bootstrap a brand-new Encore Go project from zero. Only for first-time CLI install and `encore app create` — not for architecture or feature questions.

Encore · encoredev/skills

28

Migrate an existing backend application to Encore. Supports any source framework, targets Encore.ts or Encore Go. Drives a structured DISCOVER → PLAN → MIGRATE workflow with `migration-plan.md` tracking.

Debabrata Saha · debabratasaha-dev/techskills

8

Professional backend engineering for production-grade APIs, services, workers, databases, authentication, authorization, integrations, queues, observability, testing, reliability, and security. Use when the agent needs to build, improve, review, debug, or harden backend systems in Node.js, Python, Go, Java, .NET, Ruby, PHP, SQL, NoSQL, REST, GraphQL, WebSockets, event-driven systems, or similar backend stacks. Triggers on requests to build APIs, services, workers, webhook handlers, auth systems, database layers, background jobs, queues, cron tasks, billing flows, or server-side features. Also triggers on requests to fix slow queries, race conditions, deadlocks, failing tests, deployment issues, or to review backend code for security, correctness, and reliability.

Hiếu Slash · hieutrtr/ai1-skills

8

>- Python backend implementation patterns for FastAPI applications with SQLAlchemy 2.0, Pydantic v2, and async patterns. Use during the implementation phase when creating or modifying FastAPI endpoints, Pydantic models, SQLAlchemy models, service layers, or repository classes. Covers async session management, dependency injection via Depends(), layered error handling, and Alembic migrations. Does NOT cover testing (use pytest-patterns), deployment (use deployment-pipeline), or FastAPI framework mechanics like middleware and WebSockets (use fastapi-patterns).

Aman Ktyr · amanktyr/tailor

4

Governs backend architecture, API endpoints, REST, GraphQL, database schemas, SQL, ORM, Prisma, Drizzle, migrations, transactions, and error handling standards.

Mohd Zaheer Uddin · sohailkhan0525/skills

4

Provisions, configures, and deploys any backend, database, or third-party service (e.g. Supabase, Firebase, Stripe, Postgres, Auth0, AWS, MongoDB Atlas, Vercel, Resend) through the command line — from first credential to a live, deployed backend — without the agent ever seeing or handling the raw API key/token. Use whenever the user asks to "set up", "connect", "integrate", "configure", "provision", "deploy", or "hook up" a backend/service/API, even without naming the service, or phrases like "add a database" or "get this live." Authenticates via the provider's official CLI/OAuth login where possible; otherwise the user enters credentials directly in their own terminal into `.env`, never through chat. Checks the user's plan/subscription tier and fetches current official docs when exact CLI steps aren't already known. Use instead of guessing at setup/deploy steps from memory, and never as a substitute for asking the user for missing credentials.

Md Zubair · mdzubair933/web-design-mastery-skills

Enforces professional Node.js/Express backend architecture — API design, database modeling, security, auth, and production-readiness standards. TRIGGER when: user builds or modifies any backend route, API endpoint, database schema, auth system, middleware, or server configuration. Also trigger when user asks about JWT, CORS, MongoDB, SQL, environment variables, deployment security, or backend file structure. TRIGGER also when: user's backend is crashing, leaking errors, or has security gaps they want to fix. DO NOT TRIGGER when: user is working on frontend components, CSS, React state, or any client-side UI task with no backend involvement.

Tanav Poswal · tanav29/skills

Build, review, or refactor backend systems using production-grade engineering defaults. Use this skill whenever the user asks for backend APIs, services, controllers, repositories, database access, queues, caching, auth, observability, scaling, idempotency, or "best practices" for server-side systems, even if they do not explicitly ask for architecture help.