Angular app broken in production.Fixed this session.

Change detection loops in Angular are caused by an expression in a template or a lifecycle hook that produces a new object or array reference on every check cycle. Common triggers: a method call in the template that returns a new array each time (like items.filter()), a getter property on a component class that creates a new object reference, a pipe marked as impure that runs on every cycle, or an async pipe subscribed to an Observable that emits on every CD cycle triggered by ExpressionChangedAfterItHasBeenCheckedError in development mode. The engineer uses Angular DevTools to profile change detection cycles, identifies the component and the expression causing the loop, and applies ChangeDetectionStrategy.OnPush where applicable, moves computations to pure pipes, and memoizes array references using class fields instead of inline expressions.

RxJS subscription leaks accumulate because components subscribe to Observables without unsubscribing on ngOnDestroy. The leak manifests as increasing memory in the Chrome heap snapshot, visible as a growing number of Subscriber and SafeSubscriber objects. The engineer runs a heap snapshot comparison in Chrome DevTools across two navigation cycles, identifies retained Observable subscriptions, and checks: whether the component uses takeUntilDestroyed (Angular 16+) or the destroy$ Subject pattern, whether HTTP calls that are assumed to auto-complete are actually completing, and whether router events or store selectors are being subscribed to directly. The fix applies takeUntilDestroyed via inject(DestroyRef) as the standard unsubscription pattern across all affected components.

Lazy module loading failures are caused by: the loadChildren or loadComponent path being wrong relative to the routing file after a project restructure, a circular dependency between the lazy module and the root AppModule, a missing export in the lazy module for a component referenced in the route, or a Webpack/esbuild chunk naming collision when the Angular build output hash changes and the CDN still serves an old HTML file pointing to the old chunk names. The engineer inspects the browser Network tab for the failing chunk URL, checks the Angular router error in the console, verifies the loadChildren path resolves correctly, and if the issue is a CDN stale HTML problem, ensures Cache-Control: no-cache is set on index.html and that the chunk files use content hashing.

Yes. Angular v13 to v17 migrations involve multiple breaking changes handled across a single session. The engineer uses ng update to apply automated schematics first, then manually resolves: the removal of View Engine in favor of Ivy (component test setup changes), the deprecation of ComponentFactoryResolver replaced by ViewContainerRef.createComponent(), the new standalone component model requiring NgModule declarations to be migrated, the inject() function replacing constructor injection in some patterns, the new control flow syntax (@if, @for, @switch) replacing NgIf and NgFor structural directives if you choose to migrate, and third-party library compatibility issues for packages not yet supporting Angular 17. The PM scopes the migration into phases and tracks component restoration in a shared sheet.

Every QuickHire Angular engineer passes: a live debugging exercise on a broken Angular 16+ application with a hidden change detection loop and an RxJS subscription leak, a written assessment covering Angular internals (zone.js vs zoneless, change detection strategies, dependency injection tree), RxJS operators (switchMap vs mergeMap vs concatMap, shareReplay, combineLatest), NgRx patterns (effects, selectors with memoization, entity adapter), and Angular build tooling (esbuild, differential loading, bundle analysis), plus a portfolio review of production Angular applications. Only the top 3% pass all stages. PM matches engineers to your Angular version, state management choice (NgRx vs Akita vs plain services), and styling approach (Angular Material vs Tailwind vs custom).

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