Saidah Stringer.

PRODUCT DESIGNER · FINTECH

I design clarity into complex systems, so people can move through them with confidence.

I’m a product designer who makes complicated things feel intuitive, from passkey authentication to merchant and bank portals and data-heavy reporting tools. Today, I’m exploring how AI tools can support the strategic side of product development, along with the way I design and prototype.

Selected work

Three projects from my time at Visa on the Visa Consumer Authentication Service (VCAS) team, which helps banks and merchants around the world verify cardholders, secure online payments and reduce fraud.

Each case study is a scannable overview. The full deep dive is available on request.

“Less friction, same protection.” A phone showing the passkey enrollment prompt at checkout, in front of a blurred café counter

AUTHENTICATION

MOBILE WEB

SOLO LEAD DESIGNER

Passkeys at checkout: less friction, same protection

Too many cardholders were being stopped at checkout for a second check. I designed an end-to-end passkey flow, covering enrollment, authentication and fallback, and placed enrollment inside the authentication step so it never blocks a purchase.

“Many banks, one set of rules.” A wireframe of the Issuer groups page, with banks organized into groups by policy, in front of a blurred office

ISSUER PORTAL · COMPLEX SETTINGS

Issuer groups

Processors could only set up a policy for one bank at a time. I designed issuer groups so they can apply one policy to hundreds of banks in a single step.

Read case study →

“Money made, money lost, at a glance.” A wireframe of the transaction summary, with status tiles and the error tile highlighted, in front of a blurred back office.

MERCHANT PORTAL · DATA VISUALIZATION

Transaction summary

Merchants had to read a dense table to see how much money they’d lost. I redesigned the summary so they see it at a glance, with the detail one click away.

Read case study →

Saidah Stringer standing in front of a green doorway

Hi, I’m Sai.

I’m a product designer who’s spent most of my career in fintech. I’m at my best when I can understand the people on the other side of the screen, see the patterns in a messy problem, and turn them into something calm and clear. I care about the small details that build trust for everyone in a transaction, from the banks and merchants behind it to the cardholders making it.

FOCUS

Authentication & trust

ALSO

Portals & data-dense UI

LOOKING FOR

Senior product design roles

Let’s talk.

Open to senior product design roles in fintech and beyond. I’d love to hear what you’re building.

Or write to me at Saidah.Stringer@gmail.com

© 2026 Saidah Stringer

Designed by me, built in Framer.

© 2026 Saidah Stringer

Designed by me, built in Framer.

© 2026 Saidah Stringer

Designed by me, built in Framer.