Design a banking ledger for deposits/withdrawals

Q: Design a banking ledger for deposits/withdrawals

This question evaluates a candidate's competency in monetary data modeling, concurrency control, idempotency, and maintaining transactional correctness for account balances, including handling currency precision and chronological transaction history.

Q: How do I approach Software Engineering Fundamentals interview questions?

Software Engineering Fundamentals questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master software engineering fundamentals interviews.

Question

Loading...

Banking/OO Design: Account Ledger

Design a minimal in-memory or persistent component for a bank account system that supports:

deposit(account_id, amount)
withdraw(account_id, amount) (reject if insufficient funds)
transactionHistory(account_id) (list transactions in chronological order)
balance(account_id)

Requirements

Amounts are non-negative and use correct currency precision.
Concurrency: multiple operations may happen at the same time for the same account.
Avoid double-processing if a client retries a request (idempotency).

Describe your data model and how you ensure correctness.

Design a banking ledger for deposits/withdrawals

Quick Overview

Banking/OO Design: Account Ledger

Requirements

Solution

Comments (0)