Coding standards, frameworks, refactoring, and code review (18.1K skills)
MMKV high-performance key-value storage for React Native - synchronous JSI-based reads/writes, encryption, typed hooks, multiple instances, listeners, persistence middleware adapters
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Backend code review — injection and SSRF, boundary validation, object-level authorization, mass assignment and data exposure, error leakage, N+1 and unbounded queries. Use when a diff touches API routes or handlers, database access, auth middleware, or server code that reads files, starts processes or fetches URLs.
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React Native Gesture Handler - gesture types, GestureDetector, gesture composition, state machine, platform-specific gestures, swipeable rows, hover gestures
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React Native mobile development patterns - New Architecture (Fabric, TurboModules, JSI), component architecture, React Navigation 7+, FlashList v2 optimization, gestures with Reanimated 4, platform-specific code, React 19 features
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BLE scanning/connecting/GATT operations with react-native-ble-plx, NFC tag reading/writing with react-native-nfc-manager, permissions, background mode, battery-efficient patterns
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File-based routing and navigation for Expo/React Native
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React Navigation 7+ patterns - static and dynamic APIs, type-safe navigation, stack/tab/drawer navigators, deep linking, authentication flows, screen preloading, header customization
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WatermelonDB reactive local database for React Native - schema, models, decorators, reactive queries, relations, writers/readers, batch operations, migrations, sync
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React Native performance profiling, optimization, and monitoring - JS/UI thread analysis, re-render prevention, list optimization, image performance, bundle size, startup time, memory leaks, React Compiler, New Architecture benefits
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Push notification patterns - expo-notifications (Expo) and @react-native-firebase/messaging (bare RN), permission handling, token management, foreground/background/tap listeners, local scheduling, Android channels, notification categories and actions, badge management, rich notifications
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PowerSync offline-first sync engine on SQLite for React Native - schema definition, watched queries, CRUD operations, backend connectors, sync rules, conflict resolution, attachments
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Code review process — reading order, findings, severity, scope and the approval decision. Load when reviewing a diff or PR, writing review comments, or deciding whether to approve or request changes.
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CLI code review — exit codes, cancellation and signals, non-TTY behaviour, the stdout/stderr split, error text, config precedence, subprocess safety and test adequacy. Load when reviewing a command-line tool's commands, entry point, prompts, output or tests, whichever parser or prompt library it uses.
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Biome v2 unified linter, formatter, and import organizer — single Rust-powered tool replacing ESLint + Prettier with 97% Prettier compatibility and 20x faster performance
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Backend specification frameworks — endpoint contracts, error catalogs, auth per endpoint, schema with constraints and indexes, migration strategy, middleware order. Load when a spec adds or changes an API endpoint, a database table, or a request pipeline.
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Pinecone serverless vector database -- index management, vector operations, metadata filtering, namespaces, hybrid search, inference API
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GraphQL Yoga v5 server, Envelop plugins, subscriptions, error masking
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PostHog feature flags, rollouts, A/B testing. Use when implementing gradual rollouts, A/B tests, kill switches, remote configuration, beta features, or user targeting with PostHog.
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Node.js CLI development with Commander.js and @clack/prompts - command structure, interactive prompts, wizard state machines, config hierarchies, exit codes, cancellation handling
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Chroma vector database -- collection management, automatic embedding, metadata filtering, document storage, query patterns
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Xquik REST API patterns for X post search, user and timeline reads, cursor pagination, media downloads, monitors, signed webhooks, and approval-gated X actions
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Bun-native HTTP framework — routing, TypeBox validation, Eden Treaty, plugins, lifecycle hooks
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Qdrant vector database -- collection management, point operations, payload filtering, named vectors, quantization, recommendations, snapshots
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Express.js routes, middleware, error handling, request/response patterns
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