Portfolio

Hello, I’m Dominik Seroczyński, UX/Product Designer based in Warsaw, Poland

I know your time is valuable — so let’s get to the point.

5+ years of experience in enterprise design, accessibility, and design systems. Specializing in banking and insurance products, I craft inclusive, scalable user experiences backed by research, collaboration, and real-world impact.

Case Studies

Projects that survived user testing, stakeholder debates, and my own overthinking.

Design Language Alignment Across Complex Systems

I co-led the effort to unify a fragmented B2B platform where multiple teams were building semi-consistent apps with limited shared design logic. A full design system rollout wasn’t feasible — so we needed a solution that worked within existing constraints.

By auditing live products, running cross-team workshops, and identifying UI commonalities, we defined a lightweight rulebook and component library. Our approach emphasized incremental improvement, reuse of existing patterns, and close collaboration with developers to streamline adoption without full redesigns.


Results:

  • Faster Design Turnaround

  • Lower Dev Costs via Reuse

  • Foundation for Future Accessibility & Systematization

Design Language Alignment Across Complex Systems

I co-led the effort to unify a fragmented B2B platform where multiple teams were building semi-consistent apps with limited shared design logic. A full design system rollout wasn’t feasible — so we needed a solution that worked within existing constraints.

By auditing live products, running cross-team workshops, and identifying UI commonalities, we defined a lightweight rulebook and component library. Our approach emphasized incremental improvement, reuse of existing patterns, and close collaboration with developers to streamline adoption without full redesigns.


Results:

  • Faster Design Turnaround

  • Lower Dev Costs via Reuse

  • Foundation for Future Accessibility & Systematization

Design Language Alignment Across Complex Systems

I co-led the effort to unify a fragmented B2B platform where multiple teams were building semi-consistent apps with limited shared design logic. A full design system rollout wasn’t feasible — so we needed a solution that worked within existing constraints.

By auditing live products, running cross-team workshops, and identifying UI commonalities, we defined a lightweight rulebook and component library. Our approach emphasized incremental improvement, reuse of existing patterns, and close collaboration with developers to streamline adoption without full redesigns.


Results:

  • Faster Design Turnaround

  • Lower Dev Costs via Reuse

  • Foundation for Future Accessibility & Systematization

Pension Portal Optimization

In a highly regulated financial environment, I led the redesign of Nationale-Nederlanden’s pension portal, where users struggled with trust gaps (“I pay monthly” vs. data showing missed contributions) and low engagement.

Through user interviews, surveys, and UX audits, we uncovered critical issues: incomplete profiles hindered communication, and users saw no value in regular logins. By running Design Thinking workshops, we reimagined the experience to prioritize transparency and proactive guidance, while adhering to strict WCAG standards.


Results:

  • 2x Longer Sessions

  • 35% More Completed Accounts

  • 50% Boost in Sign-Up

Nationale-Nederlanden | 2023

Pension Portal Optimization

In a highly regulated financial environment, I led the redesign of Nationale-Nederlanden’s pension portal, where users struggled with trust gaps (“I pay monthly” vs. data showing missed contributions) and low engagement.

Through user interviews, surveys, and UX audits, we uncovered critical issues: incomplete profiles hindered communication, and users saw no value in regular logins. By running Design Thinking workshops, we reimagined the experience to prioritize transparency and proactive guidance, while adhering to strict WCAG standards.


Results:

  • 2x Longer Sessions

  • 35% More Completed Accounts

  • 50% Boost in Sign-Up

Nationale-Nederlanden | 2023

Pension Portal Optimization

In a highly regulated financial environment, I led the redesign of Nationale-Nederlanden’s pension portal, where users struggled with trust gaps (“I pay monthly” vs. data showing missed contributions) and low engagement.

Through user interviews, surveys, and UX audits, we uncovered critical issues: incomplete profiles hindered communication, and users saw no value in regular logins. By running Design Thinking workshops, we reimagined the experience to prioritize transparency and proactive guidance, while adhering to strict WCAG standards.


Results:

  • 2x Longer Sessions

  • 35% More Completed Accounts

  • 50% Boost in Sign-Up

Nationale-Nederlanden | 2023

Insurance sell funnel optimization

I led the end-to-end redesign of a travel insurance purchase journey, addressing high drop-off rates and low perceived product value among users.

Despite competitive offerings, users frequently abandoned the funnel, citing unclear value and friction in the checkout process. Our research confirmed a key insight: users lacked a compelling reason to choose our platform over others and were overwhelmed by dense form steps.

  • Conducted usability tests, analytics reviews, and UX audits to map pain points.

  • Restructured the user journey to emphasize exclusive value (e.g. personalized discounts, package comparisons).

  • Simplified a complex multi-step form into grouped, user-friendly steps, reducing cognitive load.

  • Applied persuasive design principles to reinforce trust and convenience.

Results:

  • Recognition as the “Najlepszy proces zawarcia polisy turystycznej (zajęliśmy 2. miejsce)" - mojebankowanie.pl - 2024

  • 48% Sales Increase

Nationale-Nederlanden

Insurance sell funnel optimization

I led the end-to-end redesign of a travel insurance purchase journey, addressing high drop-off rates and low perceived product value among users.

Despite competitive offerings, users frequently abandoned the funnel, citing unclear value and friction in the checkout process. Our research confirmed a key insight: users lacked a compelling reason to choose our platform over others and were overwhelmed by dense form steps.

  • Conducted usability tests, analytics reviews, and UX audits to map pain points.

  • Restructured the user journey to emphasize exclusive value (e.g. personalized discounts, package comparisons).

  • Simplified a complex multi-step form into grouped, user-friendly steps, reducing cognitive load.

  • Applied persuasive design principles to reinforce trust and convenience.

Results:

  • Recognition as the “Najlepszy proces zawarcia polisy turystycznej (zajęliśmy 2. miejsce)" - mojebankowanie.pl - 2024

  • 48% Sales Increase

Nationale-Nederlanden

Insurance sell funnel optimization

I led the end-to-end redesign of a travel insurance purchase journey, addressing high drop-off rates and low perceived product value among users.

Despite competitive offerings, users frequently abandoned the funnel, citing unclear value and friction in the checkout process. Our research confirmed a key insight: users lacked a compelling reason to choose our platform over others and were overwhelmed by dense form steps.

  • Conducted usability tests, analytics reviews, and UX audits to map pain points.

  • Restructured the user journey to emphasize exclusive value (e.g. personalized discounts, package comparisons).

  • Simplified a complex multi-step form into grouped, user-friendly steps, reducing cognitive load.

  • Applied persuasive design principles to reinforce trust and convenience.

Results:

  • Recognition as the “Najlepszy proces zawarcia polisy turystycznej (zajęliśmy 2. miejsce)" - mojebankowanie.pl - 2024

  • 48% Sales Increase

Nationale-Nederlanden

This portfolio is stripped to the essentials—just the information that actually matters.

Do you want to know more, or explore case studies in more detail? Explore more

Recommendation

I highly recommend working with Dominik. My team and I are thrilled with the collaboration and the extensive UX knowledge that Dominik shared with us.

Aneta Bona · Lead UX/UI Designer at Samsung

Working with Dominik on the project to optimize customer journeys in retirement products was a rare situation where the personal pleasure of collaborating with a brilliant and friendly person combined with tangible business benefits — specifically, significantly improved conversion rates at various steps of the process.

Małgorzata Madej · Head of Customer Service in Nationale-Nederlanden

Dominic stands out for his remarkable organization, keen attention to detail, and his ability to create a positive and collaborative work environment.

Mihaela Alexe · Senior Product Designer in Raiffeisen Bank International AG

I worked with

Q&A

What do I enjoy most about design?

What do I enjoy most about design?

What do I enjoy most about design?

How do I prioritize design decisions when resources are limited?

How do I prioritize design decisions when resources are limited?

How do I prioritize design decisions when resources are limited?

How do I foster collaboration between design, development, and product teams?

How do I foster collaboration between design, development, and product teams?

How do I foster collaboration between design, development, and product teams?

How do I measure the success of my products?

How do I measure the success of my products?

How do I measure the success of my products?