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Production reliability patterns including circuit breakers with exponential backoff, graceful shutdown management with signal handling, retry logic with jitter, rate limiting with token bucket, and security best practices. Use when hardening services for production, implementing fault tolerance, adding retry logic, or ensuring graceful degradation.

Foundational Rust style conventions that apply universally to all Rust code. Covers import organization, naming conventions, and code formatting standards. This skill is automatically applied to all Rust implementations and should be referenced by all other Rust skills.

30 pragmatic rules for production JavaScript covering async operations, V8 optimization, memory management, testing, error handling, and performance. Use when writing JavaScript, optimizing performance, handling promises, or building production-grade applications. Includes promise rejection handling, V8 hidden classes, memory leak prevention, and structured testing patterns.

Build web components using Custom Elements v1 API with Declarative Shadow DOM, attribute-driven state, handleEvent pattern, and zero DOM selection. Use when creating custom elements, extending built-in HTML elements, or implementing component-based architecture. NO querySelector, NO innerHTML, NO external libraries - pure web platform APIs only.

Service architecture patterns for Axum applications including layered design (Router → Handler → Service → Repository), AppState with FromRef for dependency injection, Tower ServiceBuilder for middleware composition, and modular router organization. Use when designing service layers, managing dependencies, composing middleware stacks, or structuring Axum applications.

Production patterns for Axum 0.8.x HTTP services with Tower middleware, type-safe routing, state management with FromRef, extractors, and error handling. Use when building REST APIs, HTTP services, web applications, or adding middleware to Axum routers.

Production patterns for integrating Maud HTML templates with Axum 0.8.x web services. Covers IntoResponse implementation, handler patterns, state management with templates, error pages, layouts, and server-side rendering architecture. Use when building Axum HTTP endpoints that return HTML, creating web UIs, or implementing server-side rendered applications.

Reusable component patterns for Maud including the Render trait, function components, parameterized components, layout composition, partials, and component organization. Use when building reusable UI elements, creating component libraries, structuring templates, or implementing design systems with type-safe components.

Compile-time HTML templating with Maud using the html! macro for type-safe markup generation. Covers syntax patterns including elements, attributes, classes, IDs, content splicing, toggles, control flow (if/match/for), and DOCTYPE. Use when generating HTML in Rust, creating templates, or building server-side rendered pages.

Production patterns for Tokio 1.48.0 async runtime including task spawning, channels (mpsc, oneshot, broadcast, watch), synchronization primitives, graceful shutdown, and lifecycle management. Use when spawning background tasks, managing concurrency, implementing graceful shutdown, or coordinating async work.

Production-ready Rust patterns for type-safe domain modeling including newtypes, type states, builders, smart constructors, and const generics. Use when creating domain primitives (IDs, emails), state machines, builders, or enforcing compile-time invariants in Rust code.

Production error patterns with thiserror and anyhow, including error classification, HTTP/gRPC protocol mappings, context chains, retry logic, and testing. Use when designing error types for libraries or applications, mapping errors to API responses, or implementing retry mechanisms.

Production observability with tracing, OpenTelemetry, and Prometheus metrics including structured logging, instrumented functions, distributed tracing, health checks, and request correlation. Use when adding logging, metrics, tracing, or health endpoints to Rust services.

Comprehensive testing strategies for Rust including property-based testing with proptest, fuzz testing with cargo-fuzz, benchmark testing with Criterion, contract testing for traits, and Miri for undefined behavior detection. Use when writing tests, ensuring code correctness, detecting edge cases, or measuring performance.

Principal SEO Engineer for search-optimized web experiences. Use when implementing technical SEO, optimizing Core Web Vitals, creating structured data, building SEO-friendly architectures, or improving organic search visibility. Covers SSR/SSG strategies, meta tags, schema markup, performance optimization, and evidence-based SEO practices.

CSS Container Queries with container units (cqi, cqw, cqh, cqb) combined with Utopia.fyi fluid scales for component-level responsiveness. Use when creating truly modular components that adapt to container size, implementing component-level fluid typography with cqi units, or building context-aware design systems. Extends Utopia philosophy from viewport-based to container-based fluidity.

Utopia.fyi fluid typography and spacing system using clamp(), modular scales, and proportional design. Use when implementing fluid type scales, space palettes, t-shirt sizing, space pairs, or creating fluid responsive designs without breakpoints. Foundation for systematic, proportional scaling across all viewports.

CSS Grid, Flexbox, and Subgrid using Utopia.fyi fluid spacing for gaps and gutters. Use when creating two-dimensional grid layouts, one-dimensional flex layouts, nested subgrids, or implementing the Utopian declarative grid system. Combines layout primitives with fluid space scales for proportional, responsive layouts without breakpoints.