A 3-minute summary of a fourteen-week engagement that took transaction completion from 41% to 79%.
Role
Lead Product Designer
Duration
14 weeks
Markets
NG · GH · KE · RW · CI
Arstelio is a B2B payments platform operating across five markets in West and East Africa. When I joined the project, the product had accumulated two years of design debt, a component library nobody trusted, and a transaction completion rate that had plateaued at 41%.
I led end-to-end design across a fourteen-week engagement — from research through to shipped code. This is the condensed version. Use the tab above to switch to the full case study if you want the detail.
41% → 79% transaction completion rate within eight weeks of launch.
The core flow — initiating a payment, selecting a recipient, confirming and sending — required users to context-switch across four screens and remember information they'd already entered. On mobile, three of those screens were below the fold.
Support data told the rest of the story: 68% of inbound tickets were about payment failures, most of which were user errors that a better UI would have prevented. The team was spending more time on support than on shipping.
60%
Abandonment at step 3
68%
Support tickets (payment-related)
4m 12s
Avg. time to complete transfer
We collapsed the four-screen flow into a single progressive surface. Context — recipient history, account balances, exchange rates — was surfaced inline rather than requiring navigation. A smart-fill layer pre-populated known fields from the user's recent activity.
The component library was rebuilt with a two-layer token system. Every spacing value, colour role, and typography scale was tokenised. The library shipped with 64 components and 1:1 Figma-to-code parity, which meant the engineering team could move without waiting on design clarification.
Transaction completion rose from 41% to 79% within eight weeks of launch. Average time to complete a transfer dropped from 4 minutes 12 seconds to 1 minute 48 seconds. Support tickets related to payment errors fell by 54%.
The design system was adopted by two adjacent product teams within three months. Six months post-launch, the completion rate had held at 76% — the initial lift wasn't a spike.
79%
Transaction completion
1m 48s
Avg. transfer time
54%
Support ticket reduction
The system held. Six months post-launch, completion rate was still at 76%.