Sergio is currently unavailable
Sergio Leira
Verified Expert in Design
Designer
San Carlos de Bariloche, Río Negro, Argentina
Toptal member since March 5, 2018
Bio
Sergio is a UI/UX product designer with 18+ years of experience creating user-centered products and delivering end-to-end solutions for startups. He has released 40+ apps globally for brands like Disney, FIFA, and Messi. As a design team leader, he developed an award-winning app that reached 15 million users, boosting engagement, retention, and monetization. Known for his versatility and innovation, Sergio is eager to tackle new challenges and deliver impactful results.
Portfolio
Saas
Software as a Service (SaaS)Video on Demand (VOD)GamificationBig DataiOS App DesignAndroid App Design+ 11 more
Viacom - Mi Telefe
Mobile UXMobile App UIProduct DesignTV BroadcastingInformation Architecture (IA)iOS App Design+ 11 more
Experience
- UI Design - 12 years
- Adobe Photoshop - 12 years
- Mobile Design - 12 years
- Mobile App Design - 8 years
- iOS - 8 years
- Product Design - 6 years
- Figma - 6 years
- Design Systems - 4 years
Tools
- Adobe Photoshop
Work Experience
Web Designer
2024 - PRESENT
Suite Experience Group, LLC
- Transformed raw client brand assets into polished, high-energy mockups for three key sports ticketing pages that captured each team's unique identity.
- Designed an intuitive UI library that brought consistency and delight to premium ticket sales journeys across diverse sports franchises.
- Collaborated with front-end developers to hand off pixel-perfect designs, maintaining brand fidelity and structural consistency for professional sports venues.
Technologies: CSS, Web Design, Figma, Graphic Design, Brand Guidelines, UI Design, UI Components, Mockups, White Label Design, Responsive Web Design (RWD)
UI/UX & Logo Designer
2025 - 2025
BIO FAMILY LLC
- Shaped the visual identity of a legacy-focused family platform by refining the logo into a symbol that speaks to continuity across generations.
- Designed an intuitive, accessibility-minded UI/UX for a multi-user family history platform, optimizing flows for biography entry and tree navigation.
- Partnered with engineering to ship a web platform where family members create profiles and securely link family trees through access codes.
Technologies: User Experience (UX), Web Design, User Interface (UI), Logo Design
Product Designer
2024 - 2024
Trellis Health Systems Inc
- Designed the UI for a pregnancy-focused mobile product, ensuring compliance with industry standards and regulations.
- Collaborated actively with stakeholders in planning the product lifecycle, including feature development and roadmap creation.
- Developed mockups and prototypes to present designs to stakeholders, delivered handoff materials to developers, and oversaw the implementation of new features.
- Designed an MVP that achieved a sustainable base of paid users, with downloads doubling each week.
Technologies: User Interface (UI), User Experience (UX), Graphic Design, Product Design, Mobile UX Design, Mobile UI Design, Data Visualization, Dashboard Design, Figma, App Design, iOS, Mockups, UI Components, User Flows
UI/UX Designer
2023 - 2023
SINES, Inc
- Grew and organized a design system for a previously designed product.
- Created new pages and flows for a web app in order for users to subscribe to the app.
- Built a new version of the design source files in Figma.
Technologies: Mobile Design, iOS, Mobile UX Design, Mobile UI Design, Style Guides, Responsive Web Design (RWD), Web App Design, Web Application Design, Responsive Web Apps, Landing Page Design, Mockups
Mobile UX/UI Designer—Health Tracking Mobile App
2022 - 2022
Jenevive Health LLC
- Designed a mobile app that lets people track their health, especially for a certain disease.
- Created an interactive prototype for all the improved flows and delivered a new UI for iOS and Android devices.
- Delivered high-fidelity mockups ready for a development handoff.
Technologies: Mobile Design, Mobile UI, Mobile UX, Mobile Mockups, Health, Health IT, Visual Design, UI Design, Mobile App Design, Prototyping, iOS, Android, Adobe Experience Design (XD), Design Systems, Component Libraries, Responsive Web Design (RWD), Mobile UI Design, App Design, Responsive Web Apps, Mockups, User Flows
UX/UI Designer
2019 - 2022
Sports Buff
- Acted as the lead designer for the real-time fan engagement, gamification, and monetization audience platform. Included a desktop SDK, mobile app, Twitch app, website, and dashboard.
- Created micro-interactions and iOS native solutions for the mobile app.
- Designed an SDK solution for implementation as an OTT product.
Technologies: Adobe After Effects, Zeplin, Adobe Photoshop, Adobe Experience Design (XD), Mobile UX Design, UI Motion, Figma, Gamification, Visual Design, Mobile Design, UI Design, Mobile App Design, Web Design, Prototyping, Dashboard Design, iOS, Android, Web Applications, Design Systems, Component Libraries, Style Guides, Responsive Web Design (RWD), Mobile UI Design, App Design, Web App Design, Web Application Design, Responsive Web Apps, Landing Page Design, Landing Pages, Logo Design, Mockups, UI Components, Jira, User Flows
Mobile Headset Product Designer
2021 - 2021
RealWear - Main
- Redesigned and improved the UI/UX flows for a small voice-activated screen Android-based tablet and watch to be worn with an industrial helmet for workers in the field, factory, or warehouse.
- Redesigned the SaaS admin screens for an IoT-type device that includes analytics, charts, tables, and user permissions.
- Led the UX process and workflow. Collaborated closely with a cross-functional team to build and ship designs and produced high-quality creative solutions to complex problems based on research and goals.
Technologies: SaaS, Product Design, UI Design, Prototyping, Chart Design, Dashboards, UX Design, Internet of Things (IoT), Web App UX, User Experience (UX), User Interface (UI), Visual Design, Mobile Design, Mobile App Design, iOS, Android, Figma, Design Systems, Component Libraries, Style Guides, Mobile UI Design, App Design, Web Application Design, Responsive Web Apps, B2B, Mockups, User Flows
Web/Visual Designer
2020 - 2020
MMCA Inc
- Redesigned UX flows for the company's web app in order to improve access to their games and promote engagement and learning.
- Helped maintain and grow their existing design system.
- Designed the UI and interactive prototypes for their website.
Technologies: UI Design, Product Design, Web Design, UX Design, Figma, Zeplin, Responsive Web Design (RWD), Web Application Design, Responsive Web Apps, Landing Page Design
UI/UX Designer for Innovative Startup Capturing Feedback with Video via Mobile
2019 - 2020
Anatomap Limited
- Designed an innovative mobile app that captures user feedback and includes capturing and editing photos and videos.
- Helped delineate product decisions over software for securely storing legally admissible evidence for crime victims.
- Designed the company website, the mobile app for iOS and Android, and the desktop client and management dashboard.
Technologies: User Interface (UI), UI Design, Product Design, Visual Design, Graphic Design, Mobile Apps, User Experience (UX), UX Design, Conversational UI, Flutter, iOS, Android, Video Capture, Questionnaires, MacOS, Mobile Design, Mobile App Design, Web Design, Prototyping, Dashboard Design, Adobe Experience Design (XD), Web Applications, Design Systems, Style Guides, Responsive Web Design (RWD), Mobile UI Design, App Design, Web App Design, MVP Design, Web Application Design, Responsive Web Apps, B2B, Landing Page Design, Logo Design, Mockups, UI Components, User Flows
UX Senior Designer
2016 - 2019
Globant
- Served as UI/UX designer of native iOS and Android apps in addition to websites for globally recognized brands.
- Created a variety of digital products for different industries based on service over the platform while leading a small UX/VD team.
- Applied a user-centered design process from analysis, requirements refinement, user research, information architecture design, prototyping, usability testing, and visual designing.
Technologies: Zeplin, Adobe Illustrator, InVision, Sketch, Adobe Photoshop, Mobile UX Design, Visual Design, Mobile Design, UI Design, Mobile App Design, Web Design, Prototyping, Dashboard Design, iOS, Android, Adobe Experience Design (XD), Web Applications, Design Systems, Component Libraries, Fintech, Style Guides, Responsive Web Design (RWD), Mobile UI Design, Data Visualization, App Design, Web App Design, MVP Design, Web Application Design, Responsive Web Apps, B2B, Landing Page Design, Brand Design, Logo Design, Mockups, UI Components, Jira, User Flows
Mobile Designer
2018 - 2018
SPD Tech
- Designed the Ground Dash Mobile app UI, a safety app disguised as a fleet management tool.
- Refined product aspects in order to give the app a more user-centered approach.
- Designed the complete UI in iOS and Android for implementation over Xamarin.
- Reorganized complex data inputs and large forms into friendly user interactions.
- Built a completely interactive prototype for the app with InVision.
- Created deliverables to hand off development and style guides.
Technologies: Android, iOS, Visual Design, Mobile Design, UI Design, Mobile App Design, Prototyping, Mobile UI Design, App Design, MVP Design, User Flows
UI/UX Lead Designer
2014 - 2016
Iamat
- Served as UI/UX designer for iOS, Android, and Windows mobile apps.
- Contributed to UI/UX designs for responsive websites.
- Created apps designs which won the company design awards.
- Built interactive prototypes for a variety of apps.
- Designed apps with more than 11 million downloads.
Technologies: Zeplin, Adobe Illustrator, InVision, Sketch, Adobe Photoshop, Mobile UX Design, Gamification, Visual Design, Mobile Design, UI Design, Mobile App Design, Web Design, Prototyping, Dashboard Design, iOS, Android, Web Applications, Responsive Web Design (RWD), Mobile UI Design, App Design, Web App Design, MVP Design, Web Application Design, Responsive Web Apps, B2B, Landing Page Design, WordPress, Brand Design, Logo Design, Mockups, UI Components, User Flows
Education
2008 - 2012
Photographer in Fine Art Prints
DB Photo Studio - Buenos Aires, Argentina
2002 - 2007
Bachelor's Degree in Graphic Design
Nueva Escuela de Diseño y Comunicacion - Buenos Aires, Argentina
Certifications
OCTOBER 2024 - PRESENT
Design Thinking
Udemy
JUNE 2019 - PRESENT
Web Design
Acamica
MAY 2017 - PRESENT
Web Designer
Acamica
MAY 2007 - PRESENT
Fine Art Prints
Escuela de Fotografia DB - Buenos Aires, Argentina
Skills
Tools
Adobe Experience Design (XD), Adobe Illustrator, Adobe Photoshop, InVision, Zeplin, Sketch, Adobe After Effects, Adobe InDesign, ProtoPie, Jira
Platforms
Android, iOS, Figma, Apple TV, MacOS, Windows Phone, WordPress
Languages
CSS
Industry Expertise
Sports, Health
Other
Mobile UI, Mobile UI Design, User Interface (UI), Responsive Design, User Experience (UX), Wireframing, Prototyping, Dashboard Design, Web Applications, Product Design, Web Design, Visual Design, Mobile App Design, Mobile Design, UI Design, Mobile UX Design, Mobile Apps, App Design, Web App Design, MVP Design, Web Application Design, Responsive Web Apps, iOS App Design, Android App Design, Visual Art, Digital Product Design, UX Design, Gamification, Photography, Branding, Chromecast, UI Motion, Graphic Design, Design Systems, Component Libraries, UI Components, Mockups, Style Guides, Responsive Web Design (RWD), Data Visualization, B2B, Landing Page Design, Landing Pages, Brand Design, Logo Design, User Flows, Mobile UX, TV, TV Broadcasting, Streaming, Video on Demand (VOD), Apple TV UI, Web UI, SaaS, Interactive UI, Soccer, SaaS Design, Information Architecture (IA), Web UX, App UX, App UI, Social, Mobile App UI, TV Shows, Interface Design, Software as a Service (SaaS), Big Data, Chart Design, Dashboards, Internet of Things (IoT), Web App UX, Mobile Mockups, Health IT, Conversational UI, Flutter, Video Capture, Questionnaires, Fintech, Design Thinking, Responsive UI, Brand Guidelines, White Label Design
Collaboration That Works
How to Work with Toptal
Toptal matches you directly with global industry experts from our network in hours—not weeks or months.
1
Share your needs
Discuss your requirements and refine your scope in a call with a Toptal domain expert.
2
Choose your talent
Get a short list of expertly matched talent within 24 hours to review, interview, and choose from.
3
Start your risk-free talent trial
Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.
Top talent is in high demand.
Start hiring