Total 50,523 skills, Backend Development has 4135 skills
Showing 12 of 4135 skills
Use when adding Auth0 login, logout, and callback handling to Java Servlet web applications - integrates com.auth0:mvc-auth-commons SDK for server-side Java apps using javax.servlet with session-based authentication. Triggers on AuthenticationController, AuthorizeUrl, Tokens, IdentityVerificationException, Java MVC auth.
Use when building Elixir applications that need to evaluate JavaScript or TypeScript code, load ES modules, import npm/jsr packages, call JS functions from Elixir, or use V8 snapshots. Triggers on Denox, deno_core, Rustler NIF JS runtime, TypeScript transpilation in Elixir.
This skill should be used when the user asks to "add a database table", "create a new context", "query the database", "add a field to a schema", "validate form input", "fix N+1 queries", "preload this association", "separate these concerns", or mentions Repo, changesets, migrations, Ecto.Multi, has_many, belongs_to, transactions, query composition, or how contexts should talk to each other.
Set up DuskMoon UI system in a Phoenix project — tailwindcss v4, bun bundler, phoenix_duskmoon components, and CLAUDE.md constitution
Drizzle ORM v1 RC upgrade and migration patterns. Use when upgrading drizzle-orm/drizzle-kit to v1 (beta), migrating from Relational Queries v1 to v2, updating relations schema definitions, or working with new v1 features like `through` for many-to-many relations and object-based `where`/`orderBy` syntax.
Design backend services, APIs, and server-side boundaries. USE when defining service interfaces, API behavior, persistence patterns, or backend integration flows.
Roblox platform engineering specialist - Masters Luau, the client-server security model, RemoteEvents/RemoteFunctions, DataStore, and module architecture for scalable Roblox experiences
Error-to-fix playbook for every known failure mode on the OpenFinance backend — Polymarket, Relay, Hyperliquid, Privy delegation, and Solana RPC issues. Use this the moment a call fails, returns an unexpected status, or behaves inconsistently with on-chain state. Triggers on ANY of these error signatures verbatim or in paraphrase. Polymarket: "allowance: 0 but on-chain shows max", "CLOB reports allowance 0", "approvals confirmed but order rejected", "404 upstream" on market orders, "tick size" rejection, "order size below minimum", USDC.e vs pUSD vs native USDC confusion, V1 vs V2 exchange confusion. Relay: "InstructionFallbackNotFound", "Custom:101", "Custom:6000", "AnchorError", "Blockhash not found", "TransactionExpired", "No valid authorization signatures were provided", "Solana wallet is not delegated to the app", 412 delegation errors, quote succeeded but execute failed, stuck funds on Solana, stuck funds cross-chain, topupGas forced off. Hyperliquid: "Insufficient perp account value", "price out of bounds", WebSocket stale data, spot vs perp balance confusion. General: any "why is X failing", "why does on-chain and API state disagree", "what does this error mean". Read this BEFORE assuming a bug in the MCP or backend — most of these errors are already catalogued with known fixes.
Generate Python code for Naver Open APIs (News Search, Blog Search, Web Search, Datalab Trends, Image Search, Book Search, and other openapi.naver.com APIs). Use this skill whenever the user wants to call Naver APIs, search Naver News/Blog/Web/Images, fetch Datalab keyword trends, or write Python scripts that interact with Naver's Open API platform. This includes requests for code examples, API integration, parameter explanations, endpoint lookup, or troubleshooting Naver Open API calls. Even if the user just mentions 'Naver API', 'Naver news data', 'search trends', or 'openapi.naver.com', activate this skill immediately.
Use when the user asks to write SQL queries, optimize database performance, generate migrations, explore database schemas, or work with ORMs like Prisma, Drizzle, TypeORM, or SQLAlchemy.
Node.js/Bun backend reference skill: TypeScript-first, structured error handling, pino logging, Zod validation, async patterns, HTTP server conventions, database access, auth, queues, caching, testing, security, CLI tooling, and observability. Covers both Node.js and Bun runtimes. Use when the task touches server-side TypeScript/JavaScript code and should follow the project's backend conventions.
Use when developing application modules or microservices with the tinystruct Java framework. Covers routing, context management, JSON handling with Builder, and CLI/HTTP dual-mode patterns.