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Expert guidance for financial systems, FinTech applications, banking platforms, and payment processing. \n \n Covers payment gateway integration (Stripe), open banking APIs (Plaid), and core banking concepts including PCI-DSS, SOX, and Basel III compliance \n Includes practical code examples for payment processing, refunds, webhook handling, and bank account/transaction retrieval \n Provides financial calculation utilities for compound interest, loan amortization, NPV, and ROI with proper Decima

Advanced TypeScript expertise covering type systems, performance optimization, monorepo patterns, and modern tooling. \n \n Diagnoses and resolves complex type errors, circular dependencies, and performance bottlenecks with systematic debugging approaches \n Guides migrations from JavaScript to TypeScript, ESM/CJS transitions, and tool upgrades (ESLint to Biome, Lerna to Nx/Turborepo) \n Provides type-level programming patterns including branded types, conditional types, and inference techniques

Philosophy: Non-opinionated, correctness-focused. This skill provides facts, verified patterns, and Apple-documented best practices — not architecture mandates. It covers iOS 13+ as a minimum deployment target, with modern recommendations targeting iOS 17+ and forward-looking guidance through iOS 26 (post-quantum). Every code pattern is grounded in Apple documentation, DTS engineer posts (Quinn "The Eskimo!"), WWDC sessions, and OWASP MASTG — never from memory alone.

Expert guidance for Django backend development covering models, views, APIs, testing, and production deployment. \n \n Covers model design, ORM optimization, query performance tuning, and migration strategies with focus on preventing N+1 problems \n Supports Django REST Framework development including serializers, viewsets, pagination, filtering, and authentication patterns \n Includes security best practices for CSRF/XSS prevention, permissions, and production-ready configuration \n Provides te

Expert guidance for supply chain management, logistics optimization, warehouse management systems, and transportation planning.

Playwright E2E testing specialist for writing maintainable browser tests, debugging flaky tests, and CI/CD integration. \n \n Emphasizes role-based selectors and auto-waiting to avoid brittle tests and arbitrary timeouts \n Provides Page Object Model patterns for test organization, fixture setup, and configuration guidance \n Includes debugging workflow using trace viewer, screenshots, and retry strategies to identify and fix flaky tests \n Covers API mocking, visual regression testing, and para

Master guide for using n8n-mcp MCP server tools to build workflows.

Provides expertise in Elixir development, Phoenix Framework, and OTP patterns. Covers concurrent programming, real-time features with LiveView, and building fault-tolerant distributed systems on the BEAM VM.

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Swift Concurrency review and remediation for Swift 6.2+ codebases. \n \n Diagnoses and fixes actor isolation, Sendable safety, and data-race warnings through targeted edits that preserve existing behavior \n Applies minimal, concrete fixes: @MainActor annotations, actor isolation, Sendable conformance, and completion-handler-to-async/await migrations \n Triages compiler diagnostics by checking project concurrency settings, actor context, and whether code is UI-bound or background work \n Verifie