Mariusz Cieśla - Product Designer & Design Lead

About My Approach

My design philosophy is built on four core principles that guide how I approach every project:

• Kaizen: The Japanese philosophy of continuous improvement through small, incremental changes. I believe in constantly refining processes and workflows to make them better over time.
• Purpose: Understanding the "why" behind every decision. Great design solves real problems and creates meaningful experiences for users and businesses.
• Collaboration: The best learning happens together. I value feedback, diverse perspectives, and the collective wisdom of teams working toward common goals.
• Iteration: The first draft is rarely the best outcome. I use user data and business goals to ensure the final product actually performs.

View my full resume and work history

Featured Projects and Case Studies

Here are some of my most significant projects. Each project includes challenges I solved, the design process I followed, and the outcomes we achieved.

• Scaling product velocity: from design tax to strategic accelerator - Introduced a scalable design system to align design and engineering, improving quality and delivery speed.
  Key skills: Design systems, Accessibility, Collaboration, Information architecture
• Simplifying AI localization for non-experts - Designed and built an AI agentic interface to simplify translation for non-localization users. Prototyped in code (Cursor, Claude Code, Gemini CLI) with rapid iteration. In beta with raving enterprise feedback.
  Key skills: Product design, Prototyping, Interaction design, AI/ML design
• Scaling a mission-driven platform from idea to reality - Co-founded a mentorship platform that let people 'test-drive' careers for a day. Led product strategy, UX, and brand design while navigating hypergrowth, monetization challenges, and a TV show partnership.
  Key skills: Product design, Prototyping, UX research, Collaboration, Brand identity
• Designing a context layer for AI and human localization - Built a graph-based context management system that allows users to upload any file type as context for AI and human translation. Eliminated the need for manual TMX maintenance and improved brand alignment.
  Key skills: Product design, Information architecture, Graph database UX, AI/ML design
• Enabling insurance agents with market data - Designed a data dashboard platform enabling freelance insurance agents to understand their ideal customer profile, test approaches, and gather insights for both online and offline sales growth.
  Key skills: Product design, Journey mapping, Interface design, Experience design

View all projects and case studies

What People Say About Working With Me

Here are testimonials from colleagues, clients, and collaborators I've had the pleasure of working with throughout my career.

• Mariusz is a phenomenal designer and the reason we were able to build so rapidly. His turnaround time on high fidelity mock-ups was incredible and we rarely had to iterate on his initial designs because he understood the product and our users so well.
  Claire Tsukuda, CEO at Kipsi
• Mariusz is an incredible product designer. He always made my job as a Product Manager easy. His designs are always comprehensive. He immerses himself in the customer journey.
  George Pipoly, Product Manager at Weedmaps
• Working alongside Mariusz was one of the great privileges of my design career. He can take the most complicated problems and design beautiful and functional solutions with ease and swiftness. Mariusz is a true design leader.
  Meesh Lin, Head of Design at Paragraph

Get in Touch

I'm always interested in hearing about new projects and collaborations.

You can reach me through:

• Email: Send me a message through the contact form
• LinkedIn: Connect with me
• X (Twitter): Follow me
• Bluesky: Follow me
• Mastodon: Follow me
• GitHub: See my open source contributions
• Dribbble: View my design work

Visit the contact page