Total 55,942 skills, Backend Development has 4411 skills
Showing 12 of 4411 skills
Create validation logic and migration action builders for syncable entities in Twenty. Use when implementing business rule validation, uniqueness checks, foreign key validation, or building workspace migration actions for syncable entities. Validators never throw and never mutate.
Applies best practices for logging, project structure, and environment variable usage specifically to the main application file.
Analyzes Rails applications and generates comprehensive upgrade reports with breaking changes, deprecations, and step-by-step migration guides for Rails 2.3 through 8.1. Use when upgrading Rails applications, planning multi-hop upgrades, or querying version-specific changes. Based on FastRuby.io methodology and "The Complete Guide to Upgrade Rails" ebook.
Optimizing .NET allocations/throughput. Span, ArrayPool, ref struct, sealed, stackalloc.
ADO.NET patterns, Entity Framework, database best practices
Build crypto wallets using Circle Modular Wallets SDK with passkey authentication, gasless transactions, and extensible module architecture. Use when: creating crypto wallets with passkey-based (WebAuthn) registration and login, sending gasless transactions using Circle Gas Station paymaster, batching multiple transactions into a single user operation, implementing passkey recovery using BIP-39 mnemonic phrases, building advanced onchain wallets with custom modules (multisig, subscriptions, session keys). Triggers on: modular wallet, smart account, MSCA, passkey authentication, WebAuthn, gasless, paymaster, Gas Station, bundler client, user operation, userOp, ERC-4337, ERC-6900, account abstraction, toCircleSmartAccount, toPasskeyTransport, toModularTransport, sendUserOperation, batch transactions, 2D nonce, passkey recovery, EIP-1193 provider.
Rust async internals skill for understanding and debugging async Rust. Use when understanding the Future trait and poll model, Pin and Unpin, tokio task scheduling, debugging async stack traces with tokio-console, tracking waker leaks, using select! and join!, or avoiding blocking in async contexts. Activates on queries about Rust async internals, Future poll, Pin, Unpin, tokio-console, waker, async stack traces, select!, join!, or blocking in async.
Linker script skill for embedded bare-metal targets. Use when writing or modifying GNU ld linker scripts, placing code and data in specific flash or RAM regions, understanding VMA vs LMA, configuring startup .bss/.data initialization, using MEMORY and SECTIONS commands, or debugging linker errors about regions. Activates on queries about linker scripts, MEMORY command, SECTIONS command, .bss init, VMA vs LMA, weak symbols, or placing functions in specific memory regions.
Apply Spatie's Laravel and PHP coding standards for any task that creates, edits, reviews, refactors, or formats Laravel/PHP code or Blade templates; use for controllers, Eloquent models, routes, config, validation, migrations, tests, and related files to align with Laravel conventions and PSR-12.
Integrate the TaxCloud v3 sales tax API into an ecommerce application. Use this skill whenever the user wants to calculate sales tax, record or convert orders for tax compliance, process refunds or returns, issue standalone tax credits, import orders from external systems (Square, POS, marketplaces, ERPs, QuickBooks), handle tax-exempt customers, classify products with TIC codes, generate a typed TypeScript client from the OpenAPI spec, troubleshoot zero-tax responses, or handle any aspect of US sales tax automation with TaxCloud. Trigger on mentions of TaxCloud, sales tax calculation, nexus, tax compliance, tax quotes, order upload, exemption certificates, TIC codes, or filing.
Build, debug, and extend integrations with the EasyPost shipping API. Use this skill whenever the user mentions EasyPost, shipping labels, postage, rate shopping, tracking packages programmatically, customs forms, carrier accounts (USPS/UPS/FedEx/DHL/ePost Global), scan forms, pickups, shipping insurance, or webhooks for shipping events. Also trigger on phrases like "create a shipping label," "buy postage," "rate a parcel," "verify an address," "international shipment," "commercial invoice," "Luma rate shopping," "UPS DAP," "DHL eCommerce," or any task involving the `@easypost/api` Node.js SDK or REST endpoints under `api.easypost.com/v2`. Optimized for Node.js/TypeScript but the REST patterns, field names, and carrier gotchas apply in any language.
Razorpay integration. Manage Customers, Plans, Products. Use when the user wants to interact with Razorpay data.