# An e-commerce startup has Postgres for the app, an empty Snowflake warehouse set up last quarter, an

Canonical URL: <https://datadriven.io/problems/an-e-commerce-startup-has-postgres-for-the-app-an-empty-sno-7206a6a8>

Domain: Pipeline Design · Difficulty: medium

## Problem

An e-commerce startup has Postgres for the app, an empty Snowflake warehouse set up last quarter, and a Looker dashboard that still queries Postgres directly on every refresh. The dashboard is dragging the checkout API down each morning. Apply the section's three-gaps framing to close the gap between the operational source and the dashboard, refreshing once a day at 7am Pacific. Postgres must stay (the app still needs it).

## Related

- [All practice problems](https://datadriven.io/problems)
- [Mock interview mode](https://datadriven.io/interview/an-e-commerce-startup-has-postgres-for-the-app-an-empty-sno-7206a6a8)
- [System Design Interview Questions](https://datadriven.io/data-engineering-system-design)
- [Data Engineering Interview Prep Guide](https://datadriven.io/data-engineer-interview-prep)
- [Daily Challenge](https://datadriven.io/daily)

---

Source: DataDriven (https://datadriven.io). 100% free data engineering interview prep. Live code execution against Postgres 16, Python 3.11, and Spark sandboxes. No paywall, no premium tier, no signup gate.