Best agent skills for developers, page 801

Implement distributed cron jobs with Redis-based locking and BullMQ offloading in NestJS.

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Enforce multi-tenant isolation and PostgreSQL Row Level Security in NestJS.

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Configure Next.js cache layers, invalidation, and cache-component APIs.

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Build secure, reusable data access patterns with DTOs, taint checks, and colocated authorization in Next.js.

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Next.js version migrations using official guides and codemods.

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Implement concurrency and non-blocking I/O in modern PHP. An agent skill from HoangNguyen0403/agent-skills-standard.

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Implement modern PHP error and exception handling patterns. An agent skill from HoangNguyen0403/agent-skills-standard.

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Write unit and integration tests for PHP applications with PHPUnit and Pest.

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Test Python services with pytest, async coverage, monkeypatch, and boundary-focused fakes.

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Measures whether an automation suite builds release confidence via feedback-loop length, suite reliability, release cadence, and production escape rate, and emits a releaseconfidence verdict.

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Quarantines an intermittently failing test behind a ticket with an owner and expiry, assigns a root-cause bucket from isolated reruns, and defines when the test leaves quarantine.

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Generates Playwright page objects from an executable test plan, one class per screen with ladder-compliant locators and no assertions, wired into a shared fixture.

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Write or review manual Zephyr test cases with 1-condition-per-TC granularity, ModuleAction on Screen when Condition naming, platform prefix rules, and High/Normal/Low priority classification.

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Failure taxonomy and allowed/forbidden repairs for a failing E2E test.

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Turn acceptance criteria into an executable test plan (scenarios, seed, selector gaps) before generating E2E code.

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Captures, masks, compares, and updates screenshot baselines for web and mobile suites, with per-region thresholds and a reviewed-diff rule for every baseline change.

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Audit test coverage health, gaps, and QE debt for Jira stories or epics.

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Generate Zephyr test cases from Jira stories: parse acceptance criteria and business rules, impact-analyze existing TCs (update vs.

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Structure React Native projects with feature-first organization and separation of concerns.

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OTA updates with CodePush, EAS Build, and release configurations.

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Configure React Navigation 6+ stacks, tabs, and deep linking for React Native.

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Optimize React Native rendering for smooth 60fps mobile experiences.

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Secure storage, network traffic, and deep links in React Native mobile apps.

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Optimize React rendering, bundle size, and data flow with profiler-led decisions.

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Prevent XSS, secure auth flows, and harden React client-side applications.

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Structure Spring Boot 3+ projects with feature packaging and clean layering.

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Apply core coding standards, dependency injection, and configuration for Spring Boot 3.

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Optimize JPA, Hibernate, and database interactions in Spring Boot.

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Deploy Spring Boot apps with Docker, GraalVM native images, and graceful shutdown.

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Standards for Feign clients and asynchronous messaging with Spring Cloud Stream.

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Instrument Spring Boot with Micrometer metrics, distributed tracing, and structured logging.

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Configure Spring Security 6+ with Lambda DSL, JWT, and hardening rules.

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Write unit, integration, and slice tests for Spring Boot 3 applications.

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Apply Guard, Value Types, Immutability, and Naming conventions in Swift.

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Implement async/await, Actors, and structured concurrency in Swift.

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

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

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

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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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