Dina Karakosta

From craft to systems to code.

I'm a Senior Digital Product Designer based in Utrecht, with 7+ years primarily in B2B SaaS and some experience in e-commerce. My focus areas are design systems, interaction design, usability testing and accessibility considerations. I'm increasingly using AI to optimise design and product workflows.

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Craft Systems Code

Selected Work

Five ways I've shaped (complex) products.

CASE STUDY 01

Rebuilding fifteen years of legacy at Mambu

Led product and design on the first full UI modernization of Mambu's core banking engine, migrating a legacy GWT front end to React and MUI under a 100% feature-parity, zero-workflow-change mandate.

Design SystemsAccessibility

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The redesigned Deposit transactions view picker: a searchable panel of saved views grouped by ownership (Default, Shared, Personal, Admin only), replacing a flat unlabeled dropdown

CASE STUDY 02

How I used AI in my product design workflow

Built three custom Claude Code workflows to extract requirements from a legacy codebase, draft and post Jira stories, and automate accessibility and usability audits, built to keep pace with AI-assisted delivery across the Mambu redesign.

AI WorkflowProduct Ownership

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WCAG 2.2 accessibility comparison report for the Mambu redesign, showing GWT legacy averaging 34 and React new UI averaging 59 across Loans and Tasks pages

CASE STUDY 03

Rethinking permissions, actions and feedback in tables

Designed a reusable table pattern that gives compliance officers clear, contextual feedforward on what they can and can't do before they act, closing 5 client tickets at Fenergo.

Design PatternsScalability

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Fenergo Investigations table with 10 alerts selected and the 'Assign to me' popover open, showing which alerts the action will and won't apply to

CASE STUDY 04

Reducing dropouts for Santander's loan portal

Led UX research across analytics, session recordings, heuristics and sales-agent interviews to find why applicants were dropping out of a document upload & signing flow, then redesigned it end to end.

E-CommerceConversion Rate

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Desktop view of the redesigned upload flow alongside the new FAQ panel explaining iDIN and SECCI

Mobile view of the redesigned document upload flow, showing a progress bar and completed uploads for salary slip, passport and bank statement

CASE STUDY 05

Removing revolving credit to protect consumers

Assessed what discontinuing a regulated lending product would mean for Santander's loan funnel, then ran two sequenced A/B tests reshaping the homepage around personal loans, landing a €7.5M annual boost in requested loan amounts.

Conversion RateA/B Testing

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Experience

How I work, in practice.

Aug 2025 – Present
Senior UX Designer, Mambu

Leading the end-to-end redesign of Mambu's core banking engine UI, from requirements gathering through engineering handoff and active development support.
- Runs moderated usability testing with internal and external users at every stage of the redesign
- Builds and maintains a new design system with Claude Code, including Storybook docs and an npm package for company-wide adoption
- Embeds WCAG 2.2 AA guidelines directly into component docs, giving engineers and AI agents clear accessibility guardrails
- Drives cross-environment design strategy and a scalable design process across the organization
Apr 2023 – Apr 2025
Senior Product Designer, Fenergo

Led the end-to-end integration of the Sentinels Transaction Monitoring product into Fenergo's KYC/CLM platform, from discovery through delivery.
- Owned the full design process behind merging two products into one platform
- Kickstarted a scalable design system initiative with engineering, fully documented in Storybook
Dec 2021 – Apr 2023
Product Designer, Sentinels

Improved the UX of the Sentinels platform, used by Anti-Financial Crime and Compliance teams to detect, monitor and report financial crime.
- Lead designer across two agile squads building Sanctions Screening and Anti-Money Laundering workflows
- Ran extensive usability testing to validate decisions for high-stakes compliance workflows
- Contributed to a new UI component library, documented in Figma for consistent implementation
Aug 2019 – Dec 2021
Junior UX/UI Designer, Santander Consumer Finance Benelux

Improved the UX of the company's website and digital environments across the Netherlands and Belgium.
- Implemented A/B tests to drive conversion rate improvements
- Coded new UI elements in HTML & CSS to support rapid iteration
- Embedded user-centred thinking into cross-functional processes, lifting UX maturity org-wide
Foundations
UX Strategist, MediaMonks & early research

Started in research and strategy: as a UX Strategist at MediaMonks, and earlier as a research assistant at Utrecht University. It's the range that shapes how I approach new problems today.
- Ran interviews, competitive research, usability testing and heuristic analysis for clients including Shell, Senseo and Heineken
- Coded and analysed behavioural data for a psychology research project as a research assistant at Utrecht University