100+ shipped projects

Design systems. Product. AI.

Design systems.
Product. AI.

Design systems.

Product. AI.

18 years

design system architecture

strategy & governance

token architecture

multi-brand theming

accessibility

design engineering

figma at scale

ai workflows

ai adoption & enablement

product design

user research

entrepreneurship

guest@cassiegroos ~ percy
read as text →

No big deal!

Dragonpass

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Taking a hugely underperforming login flow (32.6%) to a projected 65–82% success rate

deep discovery

digital brand

product design

  • Before: 32.6% login success rate

  • After: Projected range of approx. 65–80% login success (+32–50%)

  • Biometric opt-in: From 14% to 100% (user intent; actual may vary)

  • Customer support load: Major anticipated reduction

Taking a hugely underperforming login flow (32.6%) to a projected 65–82% success rate

deep discovery

digital brand

product design

  • Before: 32.6% login success rate

  • After: Projected range of approx. 65–80% login success (+32–50%)

  • Biometric opt-in: From 14% to 100% (user intent; actual may vary)

  • Customer support load: Major anticipated reduction

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Marius Cloete

She has ninja-level capabilities to hit demanding headlines.

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Marius Cloete

She has ninja-level capabilities to hit demanding headlines.

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Marius Cloete

She has ninja-level capabilities to hit demanding headlines.

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Fareed Iqbal

Despite being a contractor, she worked like a permanent member of staff and showed care in her work like it was her own company.

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Fareed Iqbal

Despite being a contractor, she worked like a permanent member of staff and showed care in her work like it was her own company.

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Fareed Iqbal

Despite being a contractor, she worked like a permanent member of staff and showed care in her work like it was her own company.

More..ish

Ready for review

Stamped out: a founder’s tale of the little loyalty app that could have been

end-to-end

branding

product strategy

  • Research, brand and MVP for a loyalty platform for small businesses

  • 100+ vendors and 5,000+ users at peak

  • Scalable design system and voucher logic

  • £350k angel investment interest

Stamped out: a founder’s tale of the little loyalty app that could have been

end-to-end

branding

product strategy

  • Research, brand and MVP for a loyalty platform for small businesses

  • 100+ vendors and 5,000+ users at peak

  • Scalable design system and voucher logic

  • £350k angel investment interest

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Cassie literally saved our project.

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Cassie literally saved our project.

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Cassie literally saved our project.

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Cassie can take complex problems and turn them into intuitive, user-friendly design.

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Cassie can take complex problems and turn them into intuitive, user-friendly design.

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Cassie can take complex problems and turn them into intuitive, user-friendly design.

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She has been responsible for some of the most important visual designs the team at BAE Systems were involved in.

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She has been responsible for some of the most important visual designs the team at BAE Systems were involved in.

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She has been responsible for some of the most important visual designs the team at BAE Systems were involved in.

Hermes to Evri

Ready for review

From Hermes to Evri: shaking off a less than reputation with a UI and design system reinvention

design system creation

ui design

accessibility

  • Cross-platform UI refresh (web, app, POS)

  • Design system from scratch

  • New ways of working adopted org-wide

  • 3M+ 5-star Trustpilot reviews post-rebrand

From Hermes to Evri: shaking off a less than reputation with a UI and design system reinvention

design system creation

ui design

accessibility

  • Cross-platform UI refresh (web, app, POS)

  • Design system from scratch

  • New ways of working adopted org-wide

  • 3M+ 5-star Trustpilot reviews post-rebrand

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She brings energy, focus, commitment and an eye for detail that's always been appreciated by all who work with her.

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She brings energy, focus, commitment and an eye for detail that's always been appreciated by all who work with her.

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She brings energy, focus, commitment and an eye for detail that's always been appreciated by all who work with her.

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Her design approach is pragmatic and refreshing... she delivers real end-user value while keeping clients happy.

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Her design approach is pragmatic and refreshing... she delivers real end-user value while keeping clients happy.

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Her design approach is pragmatic and refreshing... she delivers real end-user value while keeping clients happy.

Jupita

Coming soon

Building a highly granular,multi-brand design system

Building a highly granular,multi-brand design system

Multi-brand icons that actually work!

Cheers for reading!

© 2026 Cassie Groos

Cheers for reading!

© 2026 Cassie Groos

Cheers for reading!

© 2026 Cassie Groos