Mac Kozal, Designer in Barcelona, Spain
Mac Kozal

Designer in Barcelona, Spain

Member since December 23, 2019
Along with co-founding six mobile apps, Mac is a product/UX designer with 14 years of design experience and broad architectural background. He combines the processes of those two specialties in a daily routine to create inspired and innovative products. Mac specializes in planning, conceptualizing, and designing clean, scalable, functional products, and experiences that leave a positive impact on people and solve business problems.
Mac is now available for hire


Digital Design


  • Product/UX Designer

    2019 - PRESENT
    Freelance Projects
    • Designed a tool that helps you understand and improve your company's entire people's experience.
    • Conducted multiple iterations and user tests for the above-mentioned tool.
    • Used the feedback from the user testing and multiple iterations and chose the best solution to make an overview homepage with a top-level interactive chart with filterable information, benchmark data, and real insights.
    • Worked with an alternative data provider offering European point-of-sale transaction data. The company gathers non-personal data from new or hard-to-access sources, combining vast amounts of information into fast and reliable intelligence.
    • Helped the alternative data provider to update their landing page to communicate their value proposition in a better way and made a set of interactive diagrams that make it easier to convey that message.
    • Collaborated with technical services company in the telecommunications and utility industries that has 1,000 employees providing outside and inside plant design, planning, project management, inspection, RBOCs, ILECs, CLECs, IXCs, and so on.
    • Designed for the above-mentioned company an advanced web-based utility tool that manages field data collection projects in both remote and urban locations for them (data-heavy project).
    • Created the design for the user interface and UX of the data input, data management, and presentation and oversaw the UX/UI of GIS data.
    • Designed an advanced web-based tool that provides assistance in solving chemical problems on molecular reactions using multiscale methods for simulation of a small, chemically important region or in a larger, complex chemical environment.
    • Designed the marketing webpage, technical documentation, logo, and some branding elements.
    Technologies: Digital Product Design, UI Design, UX Design, User Interface (UI), Data Visualization, Wireframing, Visual Design, Design Documentation, Prototyping, Ideation, Strategy, Usability Testing, Design Systems, Figma
  • Product Designer

    2018 - 2020
    • Designed and framed the design to the development process.
    • Constructed and maintained a scalable design system: Polestar.
    • Built the data-informed culture within the organization by implementing tools like Mixpanel and Hotjar.
    • Applied UX methodologies to a survey that improved the completion rate by 51-95%.
    • Created platfrom UX and UI improvements.
    • Prepared and performed usability testings.
    • Developed feature prioritization methodology that helped us addressing problems better.
    • Conceptualized and designed Starred Connect from scratch; Starred Connect is part of the platform that allows building integrations with external apps without code knowledge. The average time to integrate with other platforms decreased from days to minutes.
    • Designed Template Gallery and Insights Gallery—tools that allow our users to improve the UX for the respondent and get better, actionable insights.
    • Evangelized design-driven processes within the company.
    • Designed platform onboarding improvements and proposed relevant metrics to measure.
    • Conducted design sprints.
    • Performed design audits and usability heuristics.
    • Led design projects.
    • Strategized, conceptualized, designed, and tested the whole people experience workflow, that included complex dashboards and wizard-like forms.
    • Worked closely with the head of product on prioritizing and conceptualizing the product strategy.
    Technologies: Digital Product Design, UI Design, UX Design, User Interface (UI), Data Visualization, Wireframing, Visual Design, Usability Testing, Google Analytics, Lucidchart, Maze, Google, Marvel, Flinto, ProtoPie, Atomic Design,, Design Sprints, Design Systems, Adobe Suite, UsabilityHub, InVision, Mixpanel, Abstracts, Sketch, Figma


  • Master of Architecture Degree in Architecture and Urban Planning
    2004 - 2009
    Lodz University of Technology - Łódź, Poland



Barcelona, Spain

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