0avi

@0avi source repo

12 skills
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8 hours ago last updated

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CSS Developer · 0avi bundle
Organises, writes and maintains the style layer of a web project, independent of any framework or component library. Trigger when choosing between plain CSS, SCSS and Sass or asking what the difference is, when a utility framework such as Tailwind sits alongside a preprocessor, when a stylesheet has grown unmanageable, when specificity fights or important declarations are spreading, when a third-party stylesheet must be overridden, when design tokens or theming must be set up or repaired, when deciding between utility classes and semantic classes, when a style rule mysteriously does not apply, when a browser support floor must be established, or when style linting must be introduced to a project that has none. Covers plain CSS, SCSS and indented Sass, and recommends which to pick. Deliberately takes no position on which UI or component library you use.

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Java Developer · 0avi bundle
Generates modern Java code and provides architectural guidance for Java 8 through 25. Trigger when writing or modernising Java, or for best practices on immutability, records, sealed types, pattern matching, switch expressions, Optional vs null, JSpecify nullness annotations, var, text blocks, instance main methods, unnamed variables, module imports, Javadoc and Markdown doc comments, exceptions and resource management, JPMS modules, bean generation, data-oriented programming, virtual threads and carrier pinning, structured concurrency with StructuredTaskScope and Joiner, ScopedValue versus ThreadLocal, static analysis and formatting with javac lint, Error Prone, NullAway and google-java-format, Google Java Style, or version migration.

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CI CD Developer · 0avi bundle
Designs, reviews and fixes CI/CD pipelines across GitHub Actions, Azure DevOps and GitLab CI, and the release path onto Kubernetes, Azure App Service and Container Apps, AWS ECS and Fargate, plain VMs and on-prem, Cloudflare Workers and Cloudflare Containers. Trigger when writing or reviewing a workflow or pipeline, when a build is slow or flaky, for caching and parallelism, secrets and OIDC federation to a cloud, pinning and hardening third-party actions, SBOM generation, SLSA provenance and artifact signing, dependency updates with Renovate or Dependabot, SAST DAST and container scanning placement, reproducible builds, artifact registries and promotion, versioning and release tagging, environment promotion and approvals, database migration gating, deployment strategies including blue-green canary and rolling, rollback, or measuring delivery with the four key metrics.

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Postgresql Developer · 0avi bundle
Designs PostgreSQL schemas from requirements, makes database architecture decisions, writes SQL, and diagnoses and fixes slow queries. Trigger when designing or reviewing a schema, choosing a multi-tenancy model, picking data types and keys, writing constraints, planning a migration, writing or reviewing SQL (joins, aggregation, window functions, CTEs, upserts, pagination, full-text search, JSONB), choosing or fixing indexes, reading an EXPLAIN plan, diagnosing a slow query or high database CPU, tuning autovacuum or dealing with bloat, resolving locks and deadlocks, choosing an isolation level, setting up row-level security, sizing a connection pool, or planning partitioning, replication and backups. Targets PostgreSQL 14 through 18.

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Spring Sso Developer · 0avi bundle
Implements Single Sign-On in Java and Spring applications, both internal organisational SSO and SSO-as-a-feature in multi-tenant SaaS products. Trigger when integrating an external identity provider over OIDC or SAML, when acting as an OAuth2 or OIDC client or resource server, when running your own authorization server, when configuring a SAML service provider, when choosing between OIDC and SAML for a customer, when per-organisation identity provider configuration or home-realm discovery is needed, when provisioning or deprovisioning users from an identity provider, when reviewing a Spring Security configuration for vulnerabilities, or when an SSO login, logout or token validation is failing. Covers Spring Boot 4.x and 3.5.x with Spring Security 7 and 6.5, and drops into legacy, in-progress and greenfield work alike.

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Typescript Developer · 0avi bundle
Generates modern TypeScript and provides architectural guidance, deriving from the Google TypeScript Style Guide and extending it to current practice. Trigger when writing or reviewing TypeScript, or for guidance on tsconfig and strictness flags, imports and exports, ES modules, classes and private fields, functions, control flow, error handling, the type system (inference, satisfies, nullability, interfaces vs type aliases, generics, any vs unknown, branded types, discriminated unions), replacing enums with literal unions and as const objects, decorators, async and promises, resource management with using, naming, JSDoc, testing, or migrating between TypeScript 5.x, 6.0 and 7.0.

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Angular Accessibility · 0avi bundle
Takes an Angular application to WCAG 2.2 AA conformance, covering everything outside a single widget. Trigger when focus is not moved or restored after a route change or a dialog closes, when a screen reader announces nothing after an async update, when validation errors are invisible to assistive technology, when colour contrast or target size must be checked, when a keyboard user is trapped or cannot escape, when axe reports clean but the page is still unusable, or when the criteria new in WCAG 2.2 must be met. Install the official angular-developer skill alongside it; that owns ARIA roles, keyboard interaction and focus within a component, and this skill never restates it.

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Spring Boot Developer · 0avi bundle
Generates modern Spring Boot code and provides architectural guidance for Spring Boot 4.x and 3.5.x. Trigger when writing or modernising Spring Boot applications, or for best practices on package structure, Spring Modulith, REST controllers, RFC 9457 error handling, validation, Jackson 3, Spring Data JPA, transactions, Flyway, caching, Spring Security, JWT, OAuth2, HTTP interface clients, resilience, messaging, configuration, Actuator observability, async, virtual threads and structured concurrency, Spring Batch, Spring AI, MCP servers, Testcontainers testing, or Boot 3 to Boot 4 migration.

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Angular Spring Contract · 0avi bundle
Owns the contract between an Angular frontend and a Spring Boot backend, and nothing inside either. Trigger when an identifier or a money value loses precision in the browser, when a date shifts by a day between server and client, when an OpenAPI document or a generated client is involved, when RFC 9457 ProblemDetail must be consumed by Angular, when JWT storage, HTTP interceptors, silent refresh, route guards or a 401 mid-request are in play, when pagination, optimistic concurrency or file upload crosses the wire, when a trace id must survive from click to SQL, or when a Playwright storageState token expires mid-suite. Install angular-developer, spring-boot-developer, java-developer, typescript-developer, postgresql-developer and ngrx-signal-store-developer alongside it; this skill defers everything inside a single layer to them.

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Java Performance Developer · 0avi bundle
Diagnoses and fixes Java performance problems, and writes Java that does not create them, for Java 8 through 25. Trigger when an application is slow, when latency or throughput regresses, for GC pause and heap tuning, out-of-memory errors, high CPU, memory growth and native leaks, slow startup and warm-up, JVM flag selection, garbage collector choice between Serial, Parallel, G1, ZGC, Shenandoah and Epsilon, JIT and code cache tuning, benchmarking with JMH, profiling with JFR, JMC, async-profiler, jcmd, jstat and Native Memory Tracking, heap dump analysis, thread pool and executor sizing, lock contention and false sharing, allocation and object sizing, collection and String performance, buffered I/O, serialization, container and cgroup memory limits, or JDBC and JPA access cost.

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Ngrx Signal Store Developer · 0avi bundle
Generates and refactors @ngrx/signals SignalStore code and provides architectural guidance. Trigger when choosing an NgRx or Angular state management approach, when creating or migrating an Angular store, or when replacing @ngrx/store actions, reducers, selectors and effects with SignalStore; when working with signalStore, withState, withComputed, withMethods, withProps, withHooks, withLinkedState, withEntities, withReducer, or withEventHandlers; when handling async side effects with rxMethod / signalMethod; when defining reusable signalStoreFeatures; when wiring Events / Dispatcher / injectDispatch; or when testing stores with TestBed, unprotected, and patchState. This is the signals-based store that ships in @ngrx/signals, not the Redux-style global store in @ngrx/store and not @ngrx/component-store.

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Angular Webpack Esbuild Migration · 0avi bundle
Migrates an Angular project off a webpack-based builder (@angular-builders/custom-webpack, or @angular-devkit/build-angular:browser) to Angular's native esbuild builder - the application builder, or browser-esbuild as a stepping stone. Trigger when moving an Angular app off webpack or custom-webpack, switching to the application or esbuild builder, speeding up slow Angular production builds, removing webpack.config.js / babel-loader / core-js polyfills, moving Karma to the Jest builder, or fixing the errors that appear after the switch - TS2307 on package "/src/" or "/dist/" imports, TS2612 "will overwrite the base property", TS2729 "used before its initialization", zone.js/dist paths, SCSS "~" url() paths, a stray "browser/" output subfolder, or CommonJS bundle warnings. Works for any Angular version and any repo state, including multi-project workspaces and partially migrated repos.

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12 published skills