R
Robin D Castro
Robin D Castro

Portfolio

Projects

Product design work spanning UX research, interaction design and usability testing.

Featured

So every dirham meant for home gets there
2026Password

So every dirham meant for home gets there

International Money Transfer

Redesigning how migrant workers send wages home on Whizmo, against a booked-rate clock and real compliance limits. An honest cost from the start: an indicative rate up front, the real rate once they pick a method, and the full conversion at review. Risky moments treated as first-class, and the manual activation screen replaced by a compliance review tied to each transfer.

Product DesignFintechCross-border
From leaving the app at every login to a PIN or a glance
2026Password

From leaving the app at every login to a PIN or a glance

Whizmo Onboarding & Login

Redesigning Whizmo's sign-up and login for blue-collar workers using a financial app in a second language. A national ID check once, then a Whizmo PIN and biometrics for every login after. Grounded in usability research in English, Hindi, Malayalam and Tamil, shipped in English and Arabic, and measured after launch, including the part that got worse.

Product DesignFintechOnboarding
A first card for wallet users who couldn't see their money
2025Password

A first card for wallet users who couldn't see their money

Whizmo Cards

Whizmo's first card, virtual and physical, designed from a one-line brief to developer handoff, for 200,000+ wallet users who had little visibility into their own money. The full lifecycle, ten edge cases, and the trade-offs behind each call, reconciled with card-network, processor and payment-security vendor rules.

Product DesignFintechCard Payments
A shopping list that reminds you near the store
2022

A shopping list that reminds you near the store

Smart Reminder

A location-based grocery reminder app that uses GPS-triggered alerts to notify users when they're near stores. University thesis project combining UX research with interaction design.

UX ResearchUI DesignUsability Testing