Hi, I'm
Ada Melanie Cosar.
A Senior Product Designer with 7 years of experience, with 5 years at Deloitte Digital Belgium. Fluent in German, English, French, and Turkish.
certified by
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What I Do as a Product Designer
I connect research, design, and implement
UX Research & Service Design
From interviews, surveys, personas, journey mapping to service blueprints and ecosystem flows — I uncover insights that drive meaningful, scalable solutions.
UI & Design Systems
I create and implement scalable design systems in collaboration with developers.
UX Design
I design flows, wireframes, and prototypes that turn complex systems into simple, human-centered experiences.
Impact in Numbers
20+
Happy clients
150+
User interviews conducted
60+
Co-creation workshops
4.6/5
Average usability rating
Latest works
15+
Physical Kiosk installations
70%
adoption rate on launch day (used by 600 patients)
7
new trading options launched
25+
user tests
8
Production lines digitalised
75%
Improved Reaction Time
Questions I design by
These seven questions guide how I build, improve, and measure meaningful design.
01
What pain points are we solving?
02
Does it make life better for people?
03
Have we tested it with real users?
04
Is everyone truly included?
05
Does it meet ethical and regulatory standards?
06
Does it earn and sustain trust?
07
Does it drive innovation with purpose?
I'm also certified in
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Don't only believe me
Ada's ability to simplify complexity in a short time was key to the project's success.
Director at Deloitte, 2025
She set the UX bar very high — expectation-wise and quality-wise.
Client at a Cybersecurity Agency, 2024
Her understanding of UX Research makes her an invaluable asset to our team.
Senior Lead at Deloitte,
Let's Work Together
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