Skip to content

Tracks

AI-assisted engineering Working with AI Agents System design Core systems Data and AI systems Coding Coding problems Code review On-call SQL

Practice

Paths Concept guides

FreeAd-supported

The plan adds AI feedback and removes ads.

Concept guides/Consistency and money/Distributed transactions

System designConsistency and money

Distributed transactions

Hard3 min read

Questions it teaches

Transfers between a member's own accountsEasy25 min Double-entry accounting atomicity and floorsMedium40 min Trial balance and period closeMedium40 min Bank feed reconciliationMedium40 min Stream-batch reconciliationMedium35 min Cross-service order transactionHard50 min Design a transaction reconciliation systemHard55 min Merchant settlement and payout batchingHard50 min

Related

Consistency and money Messaging and streams Data modeling and storage Scale and caching Real-time systems Backend internals Reliability and failover

Builds on: Messaging and streams

Designing team chat3 min Real-time personalization4 min

Builds on: Data modeling and storage

Designing a parking lot4 min Designing a pastebin3 min

Related: Scale and caching

Connection pool proxy3 min Connection pooling proxy (gateway)3 min

Related: Real-time systems

Short polling for presence4 min URL routing3 min

© 2026 Prep Room·From California·AI can make mistakes.

About Legal Contact Cookies Your privacy choices

Home Review Tracks Paths