Total 44,046 skills, Backend Development has 3824 skills
Showing 8 of 3824 skills
Operate the joelclaw Telegram channel — primary mobile interface between Joel and the gateway. Covers grammy Bot API, text/media/reactions, inline buttons, callbacks, and streaming.
Specialized skill for working with Supabase PostgreSQL database including queries, RLS policies, migrations, functions, and data operations. Use when implementing database queries, creating migrations, setting up RLS policies, writing SQL functions, or debugging database issues.
TypeORM for TypeScript/JavaScript. Covers entities, repositories, and relations. Use with SQL databases. USE WHEN: user mentions "typeorm", "@Entity", "Repository", "DataSource", "QueryBuilder", "typeorm migration", asks about "decorators for database", "active record pattern", "entity relationships", "typeorm relations" DO NOT USE FOR: Prisma projects - use `prisma` skill; Drizzle - use `drizzle` skill; SQLAlchemy (Python) - use `sqlalchemy` skill; raw SQL - use `database-query` MCP; NoSQL - use `mongodb` skill; Sequelize - not supported
MySQL relational database. Covers queries, indexes, and optimization. Use when working with MySQL databases. USE WHEN: user mentions "mysql", "mariadb", asks about "AUTO_INCREMENT", "ON DUPLICATE KEY UPDATE", "GROUP_CONCAT", "mysql specific syntax" DO NOT USE FOR: PostgreSQL - use `postgresql` instead, MongoDB - use `mongodb` instead, Oracle - use `oracle` instead, SQL Server - use `sqlserver` instead
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
Machine Payment Protocol (MPP) for keyless, pay-per-query access to the Codex Supergraph GraphQL API. Use when the user has no API key and wants to pay per query via the 402 challenge flow at https://graph.codex.io/graphql.
Python expert for stdlib, packaging, type hints, async/await, and performance optimization
Expert knowledge for Modern Java (21+) development, including Virtual Threads, performance tuning, and idiomatic clean code. Use for deep Java language/logic questions.