Backend

Outcome: Complete the task with Backend (Backend). User context: Beim Checkout prüft das Backend den Bestand, zieht die Zahlung ab und speichert das Ergebnis. Technical concept or control: Backend (Backend). Why it fits: Legen Sie vertrauenswürdige Regeln, gemeinsame Daten, Integrationen und Arbeiten, die einen Server benötigen, im Backend ab. Do not use it when: Verlasse dich niemals nur auf clientseitige Prüfungen für Sicherheit oder Geld. Engineering requirements: Define inputs, outputs, contracts, and rules that must always hold. Set authorization and input checks. Define failures, timeouts, retries, one-time effects, data moves, and compatibility limits. Operations: Add useful signals and logs that hide sensitive data. Set capacity limits and write an operator guide. Test recovery and rollback. Acceptance criteria: Contract and failure-path tests pass. Data and authorization rules still hold during retries and partial failures. Check performance limits, monitoring, recovery, and rollback. Evidence and limits (evidence boundary): Kein einziger offizieller Standard kontrolliert den gesamten Begriff. Seine Bedeutung kann sich zwischen Teams, Plattformen oder Frameworks ändern. Unknowns to confirm: Where the code runs, data stores, traffic shape, consistency needs, and the security boundary. Also confirm the compatibility period, service goals, and rollback limits.