Sebastian Petrina, Designer in Bucharest, Romania
Sebastian Petrina

Designer in Bucharest, Romania

Member since May 17, 2016
Sebastian is a product designer with more than 11 years of design experience. For the past five years, he's co-founded and worked with startups to validate ideas, create MVPs, obtain seed funding and first-round investments, scale the products, and grow their KPIs. Sebastian specializes in UX strategy, UX/UI design, and gamification while always incorporating a human-centric framework that uses a human's core drives for motivation.
Sebastian is now available for hire


  • Co-founder | Lead Product Designer

    2018 - PRESENT
    • Validated the product-market fit and repositioned the product.
    • Increased the user retention rate from 3% on D7 up to 24% on D7.
    • Conducted competitive research and analysis to explore the marketplace and opportunities to create unique value.
    • Defined the user experience strategy based on information from the internal team and user research.
    • Created high-fidelity prototypes and animations to guide developers through complex ideas and user flows.
    • Designed a gamification system to increase the business metrics using a human-centric framework that lays out the core drives for humans motivation.
    • Reduced the burn-rate and protected resources by creating a design system to help the development team implement the design fast and efficient.
    • Analysed and further increased the main business metrics (like user retention rate, growth rate and user engagement) by iterating and testing the key experiences.
    • Communicated the product vision, change of direction and validated features to the investor and co-founders.
    Technologies: Adobe Experience Design (XD), MacOS, Zeplin, Adobe Creative Suite, Sketch
  • UX/UI Designer | UX Consultant

    2014 - PRESENT
    • Worked with various clients from small startups to large companies, to design from scratch or redesigning existing web or mobile products.
    • Performed UX audits using a variety of methods, tools, and metrics to analyze where a product was going wrong.
    • Conducted competitive research and analysis to explore the market or an opportunity to create unique value.
    • Created user journeys, high-fidelity wireframes, user interfaces, and prototypes for the MVP.
    • Iterated and tested prototypes to validate and implement intuitive designs and interactions between users and interfaces.
    • Collaborated with the developers and product management teams to streamline the work process.
    Technologies: Adobe Experience Design (XD), InVision, Adobe InDesign, Adobe Illustrator, Adobe Photoshop


  • Bachelor's degree in Marketing
    2008 - 2011
    Alexandru Ioan Cuza University - Iași, Romania



Bucharest, Romania

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