InterviewStack.io LogoInterviewStack.io

Data Integration and Flow Design Questions

Design how systems exchange synchronize and manage data across a technology stack. Candidates should be able to map data flows from collection through activation, choose between unidirectional and bidirectional integrations, and select real time versus batch synchronization strategies. Coverage includes master data management and source of truth strategies, conflict resolution and reconciliation, integration patterns and technologies such as application programming interfaces webhooks native connectors and extract transform load processes, schema and field mapping, deduplication approaches, idempotency and retry strategies, and how to handle error modes. Operational topics include monitoring and observability for integrations, audit trails and logging for traceability, scaling and latency trade offs, and approaches to reduce integration complexity across multiple systems. Interview focus is on integration patterns connector trade offs data consistency and lineage and operational practices for reliable cross system data flow.

MediumTechnical
35 practiced
You're responsible for a pipeline that moves customer events from an app through an integration service into a warehouse and a CRM. If a business user reports a missing record, how would you instrument the system so you can trace that record end to end without creating unmanageable logging volume or exposing sensitive data?
MediumTechnical
35 practiced
Customer records arrive from web signup, sales, support, and billing systems. They use different identifiers, sometimes missing fields, and occasionally disagree on name or address. How would you decide whether two records represent the same person, when to merge them, and when to keep them separate for manual review?
HardTechnical
39 practiced
You are asked to support bidirectional sync between a support tool and an internal account system, but both teams want to edit overlapping fields and both can go offline for hours. What design choices would you make to keep users from seeing stale or conflicting data, and where would you draw the line on allowing two-way writes?
HardSystem Design
39 practiced
Design the integration layer for a company with 25 internal apps and 8 external vendors sharing customer, product, and order data. The requirements are: one place to manage ownership, support both near-real-time and batch sync, keep lineage for audits, and minimize point-to-point connections. How would you structure the data flow and integration boundaries?
HardTechnical
41 practiced
A finance team reports that the warehouse shows lower revenue than the billing system after a regional outage. Some records were replayed, some were skipped, and the logs are incomplete. How would you reconcile the two systems, decide which side to trust for each record, and prevent the same class of mismatch from happening again?

Unlock Full Question Bank

Get access to hundreds of Data Integration and Flow Design interview questions and detailed answers.

Sign in to Continue

Join thousands of developers preparing for their dream job.