Diana Müller, Designer in Madrid, Spain
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Diana Müller

Verified Expert  in Design


Madrid, Spain
Toptal Member Since
July 7, 2017

Diana is a senior UI/UX designer who has driven the design experience of digital products and services for companies such as MINI, GORE-TEX, Swatch, Douglas, and Bosch, among others. Diana has worked at Accenture, IED, AQKA, and is currently at Taxfix. She enjoys using design as a tool to enhance businesses and bring ideas to life with multidisciplinary teams.


Work Experience

Senior Product Designer

2020 - PRESENT
  • Led the design of the global expansion team for our products in Spain, Italy, and Australia.
  • Managed the ideation, design, validation, and in-season experiments for the launch of Taxfix in Spain in 2022.
  • Led the ideation, design, validation, and overseeing the implementation of two new financial services, Instant Refund and Assisted Tax Filing, for the German market.
  • Oversaw implementation of designs with an in-house tech team.
  • Developed data-driven design prototypes and conducted user validation.
Technologies: Miro, Principle, Sketch, InVision, Figma, Notion, Jira

Senior User Experience Designer

2018 - 2020
  • Co-defined the product vision, led user validation, formulated UX strategy, designed site structure and prototypes, and supervised the development implementation for a new car subscription service pilot launched in Munich and Hamburg, Germany (Client: MINI).
  • Defined the site structure, established key user flows, and created prototypes to validate business requirements with clients during the .com experience redesign of Swatch (Client: Swatch).
  • Served as the lead UX designer in the redesign and launch of the global GORE-TEX.com website. Collaborated with visual designers, strategists, data analysts, and project managers to successfully launch the site across 11 countries (Client: GORE-TEX).
  • Defined the UX strategy, conducted user validation, crafted the site structure and prototypes, and collaborated closely with an in-house tech team to successfully launch the responsive web app for the new beauty booking platform, Douglas Beauty Booking (Client: Douglas).
  • Acted as the lead UX designer during the discovery phase of an innovative design project with Bosch. Led design sprints to uncover market opportunities for the DIY division and subsequently defined and validated an MVP pilot in Berlin (Client: Bosch).
  • Won the pitch, as the lead UX designer, for Dr. Oetker as a client for AKQA. Led user research and defined the overarching UX strategy and principles of the redesign of the .com experience (Client: Dr. Oetker).
Technologies: Confluence, Jira, Figma, Abstracts, Principle, InVision, Sketch

Senior UI/UX Designer

2017 - 2020
Freelance Clients
  • Redesigned the website for Rosecut. Implemented the new branding, developed a new site structure and key website flows, and delivered the style guide for implementation (Client: Rosecut).
  • Designed an eCommerce platform for the new perfume company. Also worked on applying the new brand style guide across the website to ensure consistency (Client: Dossier).
  • Designed the whole UI/UX for the native iOS app and the responsive web platform for the administrators (Client: Food For All).
  • Redesigned the website while maintaining the brand's original colors and traditional history (Client: Mulberry's).
  • Designed from scratch a platform for women to women around the world to share information about motherhood. Infinity Moms is the first living encyclopedia created by moms of the world (Client: InfinityMoms).
  • Designed the whole brand experience and UI/UX of a responsive sustainable products marketplace (Client: Greenline).
  • Redesigned the web rewards-based app for gamers by reinforcing the online branding and redefining the UX strategy along with a more consistent UI experience (Client: Appman).
  • Collaborated in the redesign of the company Level Works' online positioning and designed the UI/UX of company-owned products; also worked on designing a cryptocurrency wallet for Android (Client: Levelworks).
Technologies: Responsive Design, Android, iOS, Adobe Creative Suite, Miro, Principle, InVision, Sketch

Product Designer

2018 - 2018
GreenLine Market
  • Ensured the implementation of the company's vision from the highest levels of executive leadership to development and implementation.
  • Collaborated with a team of developers, managers, and marketing specialists to create and manage the UX and UI of our eCommerce specializing in sustainable products.
  • Created the brand and style guide for the entire digital presence of the company.
Technologies: Instagantt, Asana, Sketch, InVision

Strategic Designer

2017 - 2017
IED Madrid (Istituto Europeo di Design)
  • Worked as a strategic designer for IED, a multinational company with offices in 11 cities and three countries.
  • Designed the brand identity for our new office, with the goal of establishing a new business unit under IED. This included creating the logo, custom typography, and signage.
  • Created corporate communication documents for company executives, leadership, potential collaborators, and partners. These documents included data visualizations, infographics, dossiers, and keynote presentations.
  • Co-led strategic planning and development of a professional program that combines culinary skills and technology in Madrid. Designed marketing and sales materials such as keynote presentations and dossiers to find sponsors, partners, and participants.
Technologies: Instagantt, Asana, Apple iWork, Sketch

UI/UX Consultant

2016 - 2017
  • Managed and oversaw the visual development of digital brands, including creating logos, style guides, web identity, and corporate keynotes.
  • Took part in developing the company's collaborative digital products.
  • Maintained the design system library of diverse in-house projects.
Technologies: Apple iWork, Adobe Illustrator, Adobe Photoshop, InVision, Sketch

UI Designer

2014 - 2016
  • Worked on the Avanade team (a joint venture between Accenture and Microsoft), collaborating with onshore/offshore teams of UX architects, visual designers, project managers, and sales representatives exclusively for Fortune Global 500 clients.
  • Managed and was accountable for sales-support materials for the interactive capability.
  • Acted as the single on-point designer for a responsive Sitecore technology redesign and the mobile app design for a real estate industry leader.
  • Designed the UI/UX for a responsive study aid application for the global training of modern development tools. Developers used the wireframes, UI designs, and assets I provided to code the entire responsive web app.
  • Designed the UI of a flip-boardlike app to circulate internal news for Santander.
  • Collaborated with a UX architect and took charge of the visual design following a modular grid to make it easy for content management and responsiveness.
  • Led designer to redesign Love's, a travel stop and country store company customer portal. Oversaw the entire process from initial blueprints and analysis to designing and implementing a responsive site and an internal portal using Sitecore technology.
Technologies: Microsoft Office, Axure, InVision, Sketch, Fireworks, Adobe Illustrator, Adobe Photoshop

Lead Designer

2013 - 2014
  • Worked as the lead designer for a software development consultancy specializing in Ruby on Rails and Lean methodologies.
  • Oversaw UI/UX for digital products, branding, HTML/CSS markups, and web/mobile apps for US startups. Led the design team and managed projects.
  • Designed UI/UX of a cross-marketing platform for restaurants, including the design of the native iOS app for the end-users and the responsive web platform for restaurants and administrators.
  • Created the name, branding, and initial landing page for an app development company. Also, developed the landing page to showcase their first app.
  • Redesigned the company's internal communication, corporate branding, and public website, including the software development of the site using Ruby on Rails.
  • Crafted the brand identity and UI/UX for a soccer talent drafting app, encompassing the design of the native Android app.
Technologies: CSS3, HTML5, Apple iWork, InVision, Adobe Illustrator, Adobe Photoshop

Copywriter | Designer

2012 - 2012
Danilo Black
  • Worked as a copywriter—specializing in marketing, branding, user experience, and digital strategy.
  • Developed creative concepts for ad campaigns and digital brands.
  • Wrote scripts and created storylines mostly for enterprise clients.
Technologies: Apple iWork, Microsoft Office, Adobe InDesign, Adobe Illustrator, Adobe Photoshop

Design Intern

2011 - 2011
Alazraki 2020
  • Worked as a web design intern for the interactive media department of this advertising agency.
  • Designed user interfaces for various clients.
Technologies: Apple iWork, Microsoft Office, Adobe Illustrator, Adobe InDesign, Adobe Photoshop
2016 - 2017

Master's Degree in Design, Innovation, and Strategy

Istituto Europeo di Design | IED - Madrid, Spain

2009 - 2013

Bachelor's Degree in Graphic Design

Centro de Estudios Superiores de Diseño de Monterrey | CEDIM - Monterrey, Mexico


Principle, Sketch, Adobe Illustrator, Adobe Photoshop, InVision, Adobe InDesign, Apple iWork, Fireworks, Microsoft Office, Adobe After Effects, Asana, Figma, Jira, Confluence, Miro, Adobe Creative Suite

Industry Expertise

Fashion & Beauty, Automotive, Retail & Wholesale




iOS, Android, MacOS, Axure


User Experience (UX), User Interface (UI), Web Design, Design Systems, B2C, User Flows, Customer Journeys, Experience Maps, Digital Experience Design, User Stories, Responsive Design, Digital Product Design, User Testing, Usability Testing, Remote Usability Testing, Remote User Testing, High-fidelity Prototypes, Product Design, Visual Design, Software Design, UX Flows, User Journey Maps, Wireframing, UX Design, UI Design, Foodtech, eCommerce, B2B, Service Design, Strategic Design, Product Roadmaps, Design Sprints, Google Design Sprints, UX Workshops, Workshop Facilitation, Ideation Workshops, Innovation, Branding, Story Mapping, Instagantt, Abstracts, Strategy, Lean Research, Landing Page Design, MVP Design, Social Media Campaigns, Android App Design, Responsive Web Design (RWD), Responsive, Content Management Systems (CMS), Landing Pages, Style Guides, Financial Services, Fintech, User Journeys, UI Animation, Prototyping, Redesign, Responsive Web Apps, Digital Services, Animation, Design Workshops, Lettering, Business Strategy, Graphic Design, Notion

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