Hi, I'm Sergei —
UX/UI & Product

Technically sophisticated UX/UI design professional with 10+ years of experience designing, building and maintaining responsive websites, desktop and mobile applications, and using UI principles to drive business growth & improve end-user experience and usability.

Sergei Kovtun
Also I love to {_code;}, 🎸, 🏂, 🛹 and turn ideas into products!
UX Research
UX/UI Design
Design System

dApp design for 🦄

Worked on the UX/UI improvements of the 1inch dApp. Developed design for the following products: new gasless Fusion swap, 1inch Earn: Staking and Delegate, new Wallet design, Dev Portal, 1inch Pro - interface for advanced traders. Managed the Design System. The dApp encompasses 383 liquidity sources and boasts over 4.5 million created wallets by users. The total trade volume has reached an impressive $286 billion.

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1inch ux ui design portfolio
Market Research
Product Design
UX/UI Design
Design System

Social Media Platform - Mobile and Web Apps

One platform combining the best features from top networks for an unrivaled social experience.

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Product Design
UX/UI Design
Design System
Style Guide

Corporate Payment System for Opti-24's Customers / Gazprom Neft

Created design for the OPTI-24 Payment System including Management System, iOS and Android Mobile Apps and also marketing website.

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About Me

Experienced in design development encompassing UI graphics, user flows, wireframes, mockups, style guides, and pattern libraries. Proficient in data analysis, user experience research, A/B testing, and cognitive walkthroughs. Skilled in prototyping web applications and interactive workflows. Strong leadership abilities, collaborative mindset, innovative problem-solving, and a passion for artistic expression. Capable of facilitating design evaluations and effectively communicating the larger vision.


Beyond UX/UI design, I am a versatile team player capable of making a significant impact on overall business goals. My skills extend to various tasks, and I'm enthusiastic about collaborating with cross-functional teams to drive success.

Areas of

  • UX/UI Design / Product Design
  • Data Analysis & Analytics
  • User Experience Research
  • Data Visualization
  • HCD
  • Project & Product Management
  • Interaction Design & Usability Testing
  • Frontend Development
  • Web Content Development
  • SEO / SMM
  • Web & Marketing Solutions
  • Agile & Waterfall Development & Process


  • Environments

    Mac OS, MS Windows

  • Graphic Design

    Adobe Photoshop/Illustrator, CorelDRAW

  • Methodologies

    Scrum/Agile, Waterfall

  • Design Systems

    Google Material Design, Apple UI Guidelines

  • UX/UI Design

    Figma, Sketch, InVision, Zeplin, Adobe XD, Axure, Balsamiq

  • Mobile Design

    Responsive Design, Apple iOS, Google Android

  • Data Research/SEO

    Google Analytics, Yandex Metrika, Semrush, SimilarWeb

  • Target Ads

    Google Ads, Yandex Direct, Facebook Ads, My Target

  • User Experience Research

    Interviews, Surveys, Data Analysis, Personas and Journey Maps, A/B Testing

  • Programming

    HTML5, CSS3 (SASS/SCSS), Bootstrap, JavaScript, TypeScript, jQuery, React, Angular, Node.js, Express.js, PHP, MongoDB, MySQL, Git



Here you can find and read the feedback from my former coworkers about me and my work.

More References

Sergei is a very talented, versatile, and hardworking UX designer. He has vast design experience and his technical capabilities are outstanding. He is very detail-oriented and always delivers high-quality work. I worked with Sergei on some very complex projects and he always delivered excellent results on time.

Shahab Bokhari
CEO: Integet, LLC | Investor: Behtreen | Entrepreneur