One source of truth
Profile and checkout reference the same promo state so customers never see contradictory availability.
Growth + Loyalty · Promo Systems
Value without hunting.
Turning fragmented promo discovery, eligibility and expiry into one reusable value-management experience.
Context
The problem behind the screen.
Customers could receive promo codes from different channels, but there was no single place to understand what they had, whether it was eligible, or whether it had already expired or been used.
Reframe: The design problem was not “add a promo-code field.” It was “create a small value-management system customers can trust across journeys.”
System view
I mapped the journey as a system before styling the interface.
01
Discover
Codes arrive from multiple channels.
02
Understand
Eligibility and expiry must be visible.
03
Apply
Relevant value should appear at the right moment.
04
Persist
State must remain consistent after checkout.
Key decisions
The work was in the behaviour.
These were the decisions that reduced uncertainty, not just the screens that expressed them.
Suggest, don’t make people hunt
Relevant available value appears at the decision point instead of forcing customers to remember or re-enter a code.
Prevent before error
Used and expired codes stay visible but unavailable, reducing repeated invalid attempts and confusion.
Design the lifecycle, not the screen
Empty, available, applied, used, expired and invalid states were treated as one connected system.
Experience flow
One clear path forward.
01Discover
02Save
03Check eligibility
04Apply
05Reflect savings
06Update lifecycle
Beyond happy path
Recovery is part of the product.
The experience had to remain useful when reality stopped matching the ideal flow.
No codes available. Manual entry remains possible.
Eligibility and expiry are visible before action.
Savings are reflected immediately in the transaction total.
Past value remains legible without appearing reusable.
The code stays visible but cannot be applied.
Explain why it failed and what the customer can do next.
Measurement
What I would watch after launch.
01Promo apply success
02Redemption / reuse
03Invalid attempt rate
04Support demand
Performance data is intentionally excluded from the public portfolio. These metrics show how I would evaluate the experience after release.
Takeaway
A small input field became a state-management problem. The strongest design move was making promotional value understandable before the customer had to test it.
All work is anonymized. Proprietary screens, brands and performance data are excluded.