Case Studies - Sergio Harashyn

— award-winning product design leader and mentor

with 20+ years of experience driving innovation through design, collaborating with Cartier, Google, and UCI, and focusing on how people think and innovate.

+45% increase in Daily Active Users (DAU) within 3 months of launch
Average session duration increased by 32% after dashboard redesign
27% boost in account sign-up conversions following an improved registration flow
17% decrease in churn rate due to improved onboarding and in-app guidance
38% increase in successful KYC verifications after UX optimization
30-day retention increased from 42% to 58%

+45% increase in Daily Active Users (DAU) within 3 months of launch
Average session duration increased by 32% after dashboard redesign
27% boost in account sign-up conversions following an improved registration flow
17% decrease in churn rate due to improved onboarding and in-app guidance
38% increase in successful KYC verifications after UX optimization
30-day retention increased from 42% to 58%

+45% increase in Daily Active Users (DAU) within 3 months of launch
Average session duration increased by 32% after dashboard redesign
27% boost in account sign-up conversions following an improved registration flow
17% decrease in churn rate due to improved onboarding and in-app guidance
38% increase in successful KYC verifications after UX optimization
30-day retention increased from 42% to 58%

Data-Driven Results

Case Study: Mymo

View Interactive Prototype

As a UX and Product Designer, I led the design and strategy for a MVP of a Fintech Application. Launching this app enabled the company to sell the product to major clients, driving significant growth in DAU.

An Approach to Financials Digitization

Task completion time reduced by 41% after streamlining workflows
32% fewer clicks required for core actions (e.g., generating invoices, approving budgets)
Reduction in training costs by 35% due to more intuitive navigation and contextual guidance
Data entry errors decreased by 47% after introducing form validation and improved UI feedback
Annual operational savings of $250K+ due to faster task execution and fewer manual processes

Task completion time reduced by 41% after streamlining workflows
32% fewer clicks required for core actions (e.g., generating invoices, approving budgets)
Reduction in training costs by 35% due to more intuitive navigation and contextual guidance
Data entry errors decreased by 47% after introducing form validation and improved UI feedback
Annual operational savings of $250K+ due to faster task execution and fewer manual processes

Task completion time reduced by 41% after streamlining workflows
32% fewer clicks required for core actions (e.g., generating invoices, approving budgets)
Reduction in training costs by 35% due to more intuitive navigation and contextual guidance
Data entry errors decreased by 47% after introducing form validation and improved UI feedback
Annual operational savings of $250K+ due to faster task execution and fewer manual processes

Data-Driven Results

Case Study: Rover ERP

As a Lead Product Designer, I Led the full redesign of a complex ERP system, managing a cross-functional team to improve usability and operational efficiency. Conducted deep UX research through surveys, usability testing, and analytics.

Redesign of a complex ERP system

+28% increase in assisted sales for items not available in-store
83% of users described the experience as “memorable” or “emotionally impactful”
Reduced need for physical inventory by 21% in pilot stores
Zero reported UX friction or crashes during over 500+ AR sessions
52% decrease in customer wait time

Data-Driven Results

Case Study: Cartier

As a Lead Product Designer, I designed an immersive in-store AR experience for Cartier, bridging the physical and digital retail worlds. I collaborated with AI and AR engineers to create a seamless product visualization tool that renders unavailable jewelry items in real time on an iPad.

AR/IoT-powered luxury retail experiences

Creative Director

SalesX

2024 – 2025

Lead UX & Product Designer

Zumasys

2023 – 2024

Lead UX & Product Designer

Blue Trail Software

2021 – 2023

Senior UX/UI Designer

Viking Coders

2019 – 2021

Product Designer

IT DEV Group

2016 – 2019

Product Designer

Global Soft Invest

2009 – 2016

Graphic Designer

Freelance

2005 – 2009

Experience

Throughout my career as a designer, I’ve had the privilege of working with some very talented people at great companies.

Download Resume

Empowering Design Teams

Beyond delivering impactful results, I’m dedicated to mentoring teams, fostering collaboration, and cultivating a strong design culture. With expertise in Figma, Adobe Creative Suite, and AI-powered technologies, I turn concepts into elegant, future-proof solutions.

Proud to Be Part of UCI Designathon 2025 as a Judge and Mentor!

What an incredible weekend at UCI Designathon! I had the honor of joining as a judge and mentor, working alongside some of the most talented and driven students I’ve ever seen.

UCI Designathon 2025

My Book: Your Key to a UX Design Career.

What an incredible weekend at UCI Designathon! I had the honor of joining as a judge and mentor, working alongside some of the most talented and driven students I’ve ever seen.

My Book

Get access to the library of over 200 UX resources.

I've gathered valuable materials to aid in your UX education. I prioritize the quality and suitability of resources, having personally vetted most links or received recommendations from trusted sources.

Free UX Resources

What matters most in digital marketing for 2025?

Always start with the trends that matter! Instead of asking how to follow the market, ask yourself how to lead it. Focus on staying ahead by adopting innovation, personalization, and sustainability strategies.

Digital Marketing Trends

In the Beginning was UX.

Thank you to my parents for being good teachers all my life. And they helped me take the first steps toward my dream back in school. So, I found my way into design. It was a long journey through several experiences along the way.