Why has the average time to complete a mobile check deposit doubled for Chime's iOS users in the last 24 hours?

Introduction

The sudden doubling of average time to complete mobile check deposits for Chime's iOS users in the last 24 hours is a critical issue that demands immediate attention. This problem directly impacts user experience and could have far-reaching consequences for customer satisfaction and retention. I'll approach this analysis systematically, focusing on identifying the root cause, validating hypotheses, and developing both short-term fixes and long-term solutions.

Step 1

Clarifying Questions (3 minutes)

• Given the sudden nature of the change, I'm wondering about recent updates. Has there been any iOS app update or server-side change deployed in the last 48 hours?

Why it matters: Recent changes are often the culprit in sudden performance shifts. Expected answer: Yes, a minor app update was released yesterday. Impact on approach: If confirmed, I'd focus on the changes in that update.

• Considering the specificity to iOS, I'm curious about platform differences. Are Android users experiencing similar issues with mobile check deposits?

Why it matters: Platform-specific issues help narrow down potential causes. Expected answer: No, Android users are unaffected. Impact on approach: I'd concentrate on iOS-specific factors if confirmed.

• Thinking about user segments, I'm interested in usage patterns. Is this issue affecting all iOS users equally, or are there variations based on factors like device model or iOS version?

Why it matters: Segmentation can reveal underlying technical or compatibility issues. Expected answer: The issue seems more prevalent on newer iOS versions. Impact on approach: I'd investigate potential compatibility issues with recent iOS updates.

• Reflecting on the metric itself, I'm wondering about its components. Has there been any change in how we measure or calculate the "time to complete a mobile check deposit"?

Why it matters: Metric definition changes can sometimes explain sudden shifts. Expected answer: No changes to the metric definition or measurement. Impact on approach: I'd focus on actual performance issues rather than measurement anomalies.