Agent skills by HoangNguyen0403, page 5

Apply Optionals, Protocols, Extensions, and Type Safety patterns in Swift.

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Prevent retain cycles via ARC, weak/unowned references, and Capture Lists in Swift.

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Configure SwiftUI state, view lifecycle, and Property Wrappers correctly.

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Write XCTest cases, async tests, and organized test suites in Swift.

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Ingest a provided design artifact - screenshot, drawio, Mermaid, PlantUML, Excalidraw, slides, PDF, or IaC - into a reviewable fact sheet.

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Select infrastructure components by the constraint each removes: load balancers, caches and invalidation, queues and pub/sub, CDN, API gateway, rate limiting, consistent hashing.

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Answer classic system design problems as constraint-to-solution sketches and coach interview practice: URL shortener, rate limiter, news feed, chat, notification, autocomplete, crawler, unique id.

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Select how services talk: REST, gRPC, GraphQL, WebSocket, SSE, or webhook per hop, sync versus async per flow, service discovery mode, and DNS/edge routing.

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Choose and scale the data layer: SQL versus NoSQL per access pattern, single data ownership, replication and read scaling, partition key choice, hot partition and celebrity key mitigation.

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Compute defensible capacity numbers before architecture: average and peak QPS, storage growth, bandwidth, working-set memory, latency and availability budgets.

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Choose distributed integration and evolution patterns by the constraint each removes: outbox, CQRS, event sourcing, saga orchestration or choreography, leader election, sidecar, anti-corruption…

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Runs a timed mock system design round as the interviewer, then scores it as the coach: seven phases on a 45-minute clock, one follow-up on the weakest area, Mermaid sketches in chat, a six-criterion…

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Drives an interactive system design session: classifies depth, elicits scale/SLO/consistency inputs, computes capacity, then reveals components one by one, each justified by a constraint.

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Define module boundaries, dependency direction, data ownership, resilience, and distributed-system trade-offs.

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Make a design survivable and operable: eliminate single points of failure, pick failover topology, set RPO/RTO, define readiness signals and observability, choose a deployment and rollback strategy.

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Audit an existing or proposed architecture and return a scored verdict across nine axes, from requirements and capacity evidence to observability and rollout, then convert gaps into a prioritized…

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Write idiomatic TypeScript patterns for clean, maintainable code.

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Secure server-side TypeScript input, auth tokens, and injection boundaries.

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Development tools, linting, and build config for TypeScript.

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