Total 55,731 skills, Backend Development has 4399 skills
Showing 12 of 4399 skills
Comprehensive skill for all 26 Gang of Four design patterns with PHP 8.3+ implementations. Covers creational (Abstract Factory, Builder, Factory Method, Prototype, Singleton), structural (Adapter, Bridge, Composite, Decorator, Facade, Flyweight, Proxy), and behavioral patterns (Chain of Responsibility, Command, Interpreter, Iterator, Mediator, Memento, Observer, State, Strategy, Template Method, Visitor) plus Null Object, Object Pool, and Private Class Data.
Manage world migrations, handle breaking changes, and upgrade Dojo versions. Use when updating deployed worlds, migrating to new versions, or handling schema changes.
Manage world permissions, namespaces, resource registration, and access control. Use when configuring world ownership, setting up authorization policies, or managing resource permissions.
Develop secure smart contracts using OpenZeppelin Contracts libraries. Use when users need to integrate OpenZeppelin library components — including token standards (ERC20, ERC721, ERC1155), access control (Ownable, AccessControl, AccessManager), security primitives (Pausable, ReentrancyGuard), governance (Governor, timelocks), or accounts (multisig, account abstraction) — into existing or new contracts. Covers pattern discovery from library source, MCP generators, and library-first integration. Supports Solidity, Cairo, Stylus, and Stellar.
Concurrency: threads vs async, locks/mutexes/rwlocks, atomics, lock-free, actor model, STM, deadlock
Use Litestar's event emitter and listener system with `@listener`, `request.app.emit()`, multiple listeners per event, multi-event listeners, shared argument contracts, and custom event emitter backends. Use when decoupling async side effects, fanout-style in-process notifications, or transport-triggered domain events inside a Litestar app. Do not use for startup/shutdown lifecycle hooks, request/response interception, or broker-backed pub-sub systems that belong in app setup, lifecycle hooks, or channels.
Database migration guide. Use when generating migrations, writing migration SQL, or modifying database schemas. Triggers on migration generation, schema changes, or idempotent SQL questions.
Bootstrap a new SaaS from the SaaS Seeder Template: setup database, configure environment, create super admin user, and verify three-tier panel structure. Use when initializing a new multi-tenant SaaS project from this template.
Create custom MoonShine form fields with PHP classes, Blade views, Alpine.js interactivity, and proper data handling. Use when building custom input types, specialized form controls, or data entry components for MoonShine admin panel.
GraphQL API design. Covers schema, queries, mutations, and resolvers. Use when building or consuming GraphQL APIs. USE WHEN: user mentions "GraphQL", "schema definition", "resolvers", "mutations", "queries", "DataLoader", "N+1 problem", asks about "how to design GraphQL API", "GraphQL schema", "GraphQL authentication", "GraphQL pagination", "Apollo Server" DO NOT USE FOR: REST APIs - use `rest-api` instead; tRPC - use `trpc` instead; GraphQL code generation - use `graphql-codegen` instead
SLF4J - Simple Logging Facade for Java. Standard logging API that abstracts underlying implementation (Logback, Log4j2). Provides parameterized logging and MDC support. USE WHEN: user mentions "slf4j", "java logging api", "parameterized logging", asks about "how to log in Java", "logger facade", "MDC in java", "logging best practices java" DO NOT USE FOR: Logback configuration - use `logback` instead, Log4j2 configuration - use Log4j2 skill, Node.js logging - use `winston` or `pino` instead, Python logging - use `python-logging` instead
C# 12 language features including records, pattern matching, nullable reference types, LINQ, async/await, and modern language patterns. USE WHEN: user mentions "C#", "C# records", "pattern matching", "LINQ", "async/await", "nullable reference types", "C# generics", "C# language features" DO NOT USE FOR: TypeScript - use `typescript`, Java - use Java skills, F# or VB.NET specific features