Paycheck splitter
A simple way to send part of every paycheck to savings automatically, tested with an A/B experiment before launch.
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A closer look at the work
The problem
Members said they wanted to save more but forgot to move money after payday. The existing savings transfer was a manual, five-step flow that most people used once and abandoned.
What needed to be done
Design a split that sets itself up once and runs on every deposit, and prove it helps before building the full feature.
How the right problem was found
I mapped where members dropped out of the old flow and found that the amount field caused most of the abandonment: people did not know what to enter. I replaced it with presets (5%, 10%, 15%) and a plain-language preview of what lands in savings each month. We A/B tested the presets against a free amount field for four weeks.
The outcome, measured
The preset version won clearly and became the default. Engineering shipped it to everyone the following sprint.
- 63% vs 38%
- Setup completion (presets vs. free amount)
- 12,400
- Members with an active split after 60 days
- 4 weeks
- Experiment duration