100+ shipped projects

Design systems. Product. AI.

Design systems.
Product. AI.

Design systems.

Product. AI.

18 years

cross functional collaboration

design leadership

design system development

design thinking

high fidelity ui design

front-end collaboration

product strategy & roadmap

prototyping

ux design

ux research & discovery

ai workflows

team mentoring

video editing

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