Why should you care?

Banking demands ACID transfers, RBAC, and immutable audit — template for regulated MEAN apps.

See it live — copy this example

Paste into your MeanVerse project (Angular + Express + MongoDB), then run with ng serve / node / mongosh as noted.

// meanverse-banking/
//   api/src/modules/transfers/transfers.routes.ts
//   web/src/app/features/banking/transfer.service.ts

// transfers.routes.ts
router.post('/', auth, requirePermission('transfers:create'), validateTransfer, async (req, res, next) => {
  try {
    const result = await transferService.execute(req.user.tenantId, req.body);
    audit.log('TRANSFER', req.user.id, result.id);
    res.status(201).json(result);
  } catch (e) { next(e); }
});

// transfer.service.ts (Angular)
@Injectable({ providedIn: 'root' })
export class TransferService {
  private http = inject(HttpClient);
  create(dto: TransferDto) {
    return this.http.post<TransferResult>('/api/banking/transfers', dto);
  }
}

What happened?

• API route enforces auth, permission, validation before service.
• audit.log satisfies regulators.
• Angular TransferService posts DTO matching server schema.

Practice next

1. Scaffold meanverse-banking/ with api and web folders.
2. build transfer with Mongo transaction.
3. Add teller vs admin RBAC on routes.
4. Add daily transfer limit validator server-side.
5. Generate PDF statement worker from transactions collection.

Remember

Banking = transfers + RBAC + audit. Transactions protect account balances. Angular service mirrors REST contract.

Regional credit union

500 branches use MeanVerse teller app for transfers.

Outcome: Audit trail passes OCC exam; p95 transfer under 400ms.