✦ Available for Q4 25 ✦
Work with one of the most experienced Designer
I partner with ambitious founders, startups, and scale-ups as a fractional CDO and strategic UX expert - delivering clarity, structure, and impact to your product journey.
Let's Talk →Design Services for Next-Level Impact
I merge creativity with precision to craft design that elevate your brand and streamline your workflows. With a foundation in scalable, data-driven components and years of UX/UI expertise, I empower businesses to transform fragmented efforts into cohesive, impactful digital ecosystems.
My experience
End-to-end design from UX research to UI and Webflow—backed by 17+ years in top companies.
Let's talk →
Head of UX · CloudFerro S.A.
As Head of UX at CloudFerro, I lead end-to-end user experience for our cloud-based products.
- Strategy & Vision: Define UX roadmap aligned with business goals, onboarding stakeholders from sales to engineering
- Team Leadership: Mentor and coordinate a distributed team of UX/UI designers and researchers
- Data-Driven Design: Implement usability testing and analytics to continuously optimize dashboards and workflows
- Cross-Functional Collaboration: Partner with product managers and developers to ensure seamless, on-time delivery
Founder · Stealth Startup
Building a niche SaaS tool from the ground up, focused on AI and Data.
- Product Ideation: Conducted market research and validated the MVP through hands-on user interviews
- Full-Stack Design: Crafted wireframes, high-fidelity UI, and design system in Figma
- Rapid Prototyping: Launched clickable prototypes to secure early pilot customers
- Brand & Go-to-Market: Developed logo, website (Webflow), and positioning that resonated with beta users
Chief Design Officer · Stella Technologies Group LLC
Overseeing all design functions for a fast-growing API integration platform.
- Design Management: Built and scaled the first in-house design team, established hiring processes
- Brand Leadership: Revamped Stella’s visual identity and messaging for enterprise audiences
- Systematization: Introduced a modular design system to ensure consistency across web, mobile, and docs
- Stakeholder Alignment: Regularly present UX roadmaps and ROI forecasts to C-suite
Head of Product Design · SALESmanago
Led product UX/UI for one of Europe’s largest marketing-automation platforms.
- Team & Process: Managed 4 designers and 2 researchers in a hybrid setup (Cracow + remote)
- User Research: Ran regular persona workshops, uncovering insights that boosted feature adoption by 45%
- Strategic Initiatives: Launched a redesigned analytics dashboard, driving a 200% increase in customer-reported ROI
- Design System: Championed and rolled out a scalable component library in Figma and Storybook
.png)
Head of Product Design · Beans Marketplace
Delivered a full UI/UX overhaul for a B2B coffee-trading platform under tight deadlines.
- End-to-End Execution: Owned research, wireframing, visual design, and developer hand-off
- Brand Alignment: Ensured every interface reflected Beans’ mission of seamless B2B commerce
- Timely Delivery: Met all sprint milestones, enabling a successful public beta launch
- Outcome: Positive user feedback on navigation flow and purchase funnel efficiency
Senior Product Designer & Design System Product Owner · Synerise
At Synerise a Polish AI-driven growth ecosystem I combined hands-on product design with end-to-end ownership of the company’s first design system:
- Design System Leadership: Spearheaded creation and rollout of a modular UI library in Storybook, crafting 300+ components with full documentation to ensure consistency across web and mobile.
- Feature & Interaction Design: Designed and prototyped core features for Synerise’s real-time interaction management platform, improving usability and reducing user errors by an estimated 25%.
- Cross-Functional Partnership: Worked side-by-side with front-end engineers, product managers, and data scientists to integrate design assets directly into React code, cutting hand-off time by 20%.
- Team Mentorship & Processes: Established UX/UI best practices, led weekly design reviews, and mentored junior designers—fostering a culture of user-centered thinking and rapid iteration.
- Impact & Outcomes: Accelerated design-to-development cycles by over 30%, drove internal adoption of the new design system, and supported Synerise’s growth from startup to market leader in its segment.
My Mission
My mission is to revolutionize how teams approach design and development by providing a unified framework that accelerates innovation, strengthens brand consistency, and enhances collaboration across all stakeholders.
Let's talk →17+
Years on the market
17+ years on the market delivering design services that revolutionize user experiences and accelerate business growth."
200%
200% Growth in Client ROI
My design systems aren’t just tools, they’re catalysts for exponential growth. Over the past two years, I have enabled clients to achieve a 200% increase in ROI by delivering consistent, high-quality, and data-driven solutions.
10+
Data-Driven Design Systems
I believe in actionable insights. By leveraging analytics, I craft data-driven design systems that turn complex datasets into intuitive interfaces, helping brands make informed decisions with confidence."
5+
Global Reach
From startups to enterprises, I have partnered with forward-thinking companies across 5+ continents, unifying diverse brands under cohesive, impactful identities that resonate across markets.
40%
Efficiency and Performance
My approach optimizes workflows, saving up to 40% in development and design time. By focusing on performance and streamlined processes, I help teams achieve more, faster—without compromising quality.
500+
Successful Projects
With over 500 successful projects delivered, I have empowered brands to launch innovative digital products that inspire users, accelerate growth, and push creative boundaries in their industries.
Let's create your Product
together!
My expertise is built on a foundation of years of hands-on experience driving impactful design solutions across industries. As the founder I brings over a decade of leadership in product design, having spearheaded design initiatives at leading Martech companies and collaborated with global brands in fintech, enterprise, and tech startups.
Let's talk →
Kosma Lenar
Results That Speak for Themselves
Achieving measurable impact through tailored UX & Product Design strategies.
Accelerated time-to-market by 30%
"Working with on the Colloid Design System was a game-changer. Their expertise in scalable design and seamless integration helped us unify our brand and accelerate product delivery"
Piotr Nikel
Chief Product Officer - Synerise
20% Increase in Product Efficiency
Kosma's leadership and strategic vision transformed our product design approach, significantly enhancing our SaaS offerings. His ability to mentor and inspire a high-performing design team fostered a culture of innovation, directly contributing to measurable growth and success at SALESmanago.
Piotr Uryga
Chief Technical Officer - SALESManago
45% Faster Prototype-to-Launch Cycle
Kosma's expertise in complex design systems and rapid prototyping has been invaluable to our success at GetBeans. His seamless collaboration with developers ensured efficient workflows and exceptional outcomes. Highly recommended!"
Wojciech Szkutnik
CEO - getBeans