Angular Enterprise Frontend Development

Refactor JavaScript code using ES modules, destructuring, spread syntax, and optional chaining.

Transform banking data without mutation using map, filter, reduce, and object spread.

Implement a Promise-based API workflow with async/await and explicit error handling.

Predict the execution order of synchronous code, Promise microtasks, and timer callbacks in the JavaScript event loop.

Define strict TypeScript interfaces with readonly properties and nullable fields for banking DTOs.

Model success and failure responses with discriminated unions and narrow them using type guards.

Create a generic API response type that preserves its payload type across a service boundary.

Create a standalone Angular component with explicit template dependencies in its imports array.

Use interpolation, property binding, event binding, and two-way binding in a small component while distinguishing two-way binding from the project’s later Reactive Forms approach.

Render conditional and repeated content with @if and @for while supplying a stable tracking expression.

Pass typed data into a child component with an input and emit a typed user action through an output.

Inject a service with inject() and use it to separate presentation behavior from data-access behavior.

Compose reusable shell, navigation, and financial-summary components into an application layout.

Configure standalone routes for dashboard, accounts, transfers, and authentication pages.

Lazy-load a standalone feature route and render it through a router outlet.

Render an event-derived Observable with AsyncPipe and explain how it manages subscription cleanup.

Transform an Observable pipeline with map, filter, and tap without nesting subscriptions.

Use switchMap to cancel a stale account-search or asynchronous-validation request.

Use mergeMap to execute independent requests concurrently.

Use concatMap to preserve the order of queued operations.

Use exhaustMap to prevent duplicate transfer submissions while one request is active.

Maintain shared stream state with a typed BehaviorSubject while exposing only a read-only Observable.

Implement local UI state with signal, computed, and effect, then select Signals or RxJS for a stated banking UI scenario.

Derive a strict TypeScript DTO from a sample backend JSON contract without using the any type.

Register Angular’s HttpClient providers and implement a typed GET service for account portfolio data.

Send pagination, sorting, and filtering values as typed HTTP query parameters.

Implement a typed HttpClient POST service for a transfer request and response.

Map HTTP status codes and backend error payloads into a user-facing domain error model.

Recover from a failed stream with catchError while preserving a type-safe return value.

Apply retry only to a safe, idempotent request and explain why a transfer POST must not be retried blindly.

Cache and share a stable HTTP result with shareReplay, then invalidate or refresh it after relevant data changes.

Trace the OIDC Authorization Code with PKCE journey among an Angular SPA, Keycloak, and an API gateway.

Implement a simulated authentication service that represents unauthenticated, authenticated, and step-up-required states while keeping its mock access token only in memory.

Register an HttpInterceptorFn that attaches the simulated bearer token only to approved first-party API requests.

Protect an authenticated route with a functional CanActivateFn guard.

Restrict a route by ROLE_BANKER or ROLE_CUSTOMER claims while explaining why server-side authorization remains authoritative.

Handle an HTTP 401 response by initiating a controlled re-authentication path rather than retrying indefinitely.

Diagnose a failed CORS preflight in the browser Network panel and identify the origin, method, or header permission that is missing.

Choose appropriate XSS and CSRF protections for memory-held bearer tokens, JavaScript-readable storage, and HttpOnly cookie designs.

Create a strictly typed, non-nullable reactive form for source account, target IBAN, amount, and currency.

Apply required, minimum-amount, and format validators to individual transfer controls.

Implement a custom IBAN validator that returns a well-defined iban validation error.

Implement a cross-field validator that prevents the selected source account’s IBAN from matching the target IBAN.

Implement a simulated asynchronous validator for a backend-controlled transfer rule.

Expose validation errors with accessible text only after the relevant control is touched or submission is attempted.

Configure Angular Material dependencies and theming, then organize the transfer workflow with form fields and stepper stages.

Derive a TransferRequest from the valid form with getRawValue rather than an unsafe type assertion, submit it, and represent idle, processing, success, and failure states.

Format balances and dates with Angular pipes using explicit currencies and locales.

Convert account snapshots into chart-ready series and bind them to an accessible net-worth widget with a textual equivalent.

Render typed transaction records in an Angular Material table.

Connect Material sorting events to a server-side transaction query.

Connect Material pagination events to a server-side transaction query.

Display distinct loading, empty, success, and error states for the account ledger.

Create a typed WebSocket service for simulated transaction-status events.

Model success, rejection, and pending WebSocket messages as a discriminated union.

Route incoming transaction events to an accessible snackbar or notification presentation with RxJS operators.

Use scan to update a recent-activity collection without mutating its previous value.

Release imperative component subscriptions with takeUntilDestroyed while preferring AsyncPipe for template-only streams.

Implement bounded reconnection delays for an interrupted WebSocket without creating duplicate connections.

Add semantic landmarks, a logical heading structure, and accessible names to a financial dashboard.

Implement keyboard navigation and focus restoration for a transfer dialog or step-up authentication modal.

Check a representative page for WCAG 2.1 AA contrast, form-error, and visible-focus requirements.

Apply OnPush change detection with immutable input updates to a data-heavy component.

Use stable @for tracking and precomputed view data to reduce unnecessary list rendering.

Measure an interaction in Chrome DevTools and identify scripting, rendering, or network work that prevents a fast response.

Assemble and trace an end-to-end transfer slice from reactive form through service, interceptor, mock gateway, response handling, and notification update.

Inspect an unfamiliar Angular repository and produce a concise map of its bootstrap path, routes, providers, shared services, DTOs, environment settings, and feature conventions.