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The customer says the synced orders table 'does not match' their ERP. Show me the queries you run.

The most common escalation in any data deployment, and the one that quietly ends trust in the platform. Four causes produce it, one of them means nobody is wrong, and you cannot tell them apart without running the ladder in order.

Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

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UP NEXT ON YOUR JOURNEY

Next in this trackFind the users who were active in January but not in February.Next in this trackFind the customers whose return rate exceeded 30% last quarter.Next in this trackSync a customer's on-prem Postgres to your cloud at 10,000 updates/sec. You may not install anything on the DB server.

FEDITOR'S NOTE

Interviewers want to see a ladder, not a hypothesis. Candidates who open with 'it is probably a timezone issue' are usually right and still score badly, because they guessed rather than measured, and the day they are wrong they will have spent a week on it. The cause people almost never name is the fourth one: ERPs let users amend historical orders in place, so last month's total legitimately changes when recomputed today. Neither system is broken and the customer is not mistaken, which makes it the hardest of the four to explain and the most important to recognize.

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