Available to hire
Senior Product Designer based in Madrid with 12+ years of experience in UX/UI, design systems and product strategy. I have led end-to-end design (discovery, research, prototyping, delivery) for EU-funded AI, robotics and accessibility products at Fundación ONCE, and for eCommerce and native app projects at Orange and Papa John’s. I build and govern design systems (Atomic Design, design tokens), work closely with engineering, and implement my own designs in front-end code (React/Next.js, Tailwind, TypeScript). Recently I have been extending my profile into applied AI and cybersecurity through a 400+ hour bootcamp and my own SOC lab. Portfolio: sergianonimo.com
Experience Level
Language
Spanish; Castilian
Fluent
English
Advanced
French
Beginner
Work Experience
Senior Product Designer at Fundación ONCE / Inserta
July 1, 2022 - October 31, 2025Owned end-to-end product design for R&D initiatives in AI, robotics, and accessibility: research, problem definition, ideation, information architecture, UX/UI, prototyping, and validation. Conducted user research using interviews, surveys, empathy maps, proto-personas, and benchmarking with users and stakeholders. Conceptualized digital products and native/hybrid apps (user flows, sitemaps, wireframes, high-fidelity prototypes). Created and maintained design systems based on Atomic Design and design tokens, aligning with Material Design and Apple Human Interface Guidelines. Collaborated with engineering on feasibility, consistency, and implementation quality using component libraries. Mentored junior designers in Agile teams (Scrum/Kanban).
UI/UX Designer at NTT DATA Europe & Latam (Orange)
May 1, 2021 - July 31, 2022Designed UX/UI for Orange España eCommerce and native customer app, including research, interviews, empathy maps, benchmarking, user flows, sitemaps, and low/high-fidelity prototypes. Built and evolved eCommerce interfaces such as product pages, pricing, promotions, and purchase flows. Developed Figma components (variants, properties, Auto Layout) to support consistent engineering implementation. Reorganized and documented an Atomic Design-based design system, improving consistency and speeding delivery of new screens by 14%. Collaborated with engineering using HTML, CSS, and SASS adjustments. Mentored junior designers and supported execution in Agile (Scrum/Kanban) with Jira and Confluence; tracked performance using Google Analytics.
UX/UI Designer & Sr. Graphic Designer at Cofares
October 1, 2019 - December 31, 2020Led renewal and evolution of Cofares’ brand identity and applied it across the digital ecosystem to improve visual coherence and perception. Conducted UX research for eCommerce and internal tools using interviews, empathy maps, proto-personas, surveys, and benchmarking. Produced UX/UI deliverables: ideation, wireframes, prototyping, and interface validation, including web layouts implemented with HTML and CSS. Designed packaging for own-brand cosmetics and food-supplement lines and created visual elements for point-of-sale spaces. Produced digital assets (landing pages, newsletters, banners) and managed communications via Salesforce Marketing Cloud.
UX/UI Designer & Sr. Graphic Designer at Papa John's Spain
September 1, 2018 - October 31, 2019Coordinated and developed brand graphic resources following international guidelines, supporting art direction for local campaigns and adaptation of international campaigns. Delivered UX/UI work including research, ideation, wireframes, and prototyping for digital experiences. Managed content via CMS and tracked metrics with Google Analytics; managed menu boards via MagicINFO. Led a featured project: branding and eCommerce renewal aimed at improving user experience and conversion, resulting in +8% eCommerce conversion and +18% brand perception.
Creative Art Director at Carrefour
August 1, 2017 - July 31, 2018Provided creative direction and conceptualization for catalogs and commercial content across Spain and France from brief to final delivery. Directed and coordinated photographers, stylists, makeup artists, models, and production teams; supervised photo shoots. Coordinated with the international team in France with regular travel for production and follow-up. Improved catalog aesthetics, visual hierarchy, and presentation.
Senior Graphic & Creative Designer at Digital Grafic
September 1, 2014 - July 31, 2017Created graphic design and corporate identity for multiple clients, including Aeroméxico, Magma Cultura, MUNCYT, Praxair, Geyn, and Universidad Camilo José Cela. Worked on UX/UI and web design, online layout, final art, and prepress. Led the company’s digitalization efforts, expanding national and international commercial reach.
Production Executive at Incut
October 1, 2013 - September 30, 2014Developed brand identity and digital presence for a laser-cutting design company, supporting clients including IED Madrid, Pertegaz, Turismo de México, Schweppes, and fashion designers including Beatriz Peñalver.
Personal Assistant at Beatriz Peñalver
April 1, 2013 - September 30, 2013Provided creative assistance to a fashion designer, supporting collection development, prints, accessories, catalogs, and brand digital communication.
Draftsman & Graphic Designer at Thutmosis III Funerary Temple Project
November 1, 2012 - November 1, 2012Worked as part of an international excavation team in Luxor, Egypt, documenting, cataloging, and producing archaeological drawings during the campaign at the Funerary Temple of Thutmosis III.
Education
Bachelor's Degree in Fine Arts at Universidad de Granada
January 1, 2007 - January 1, 2011UX/UI Design Bootcamp at NorthCamp
January 1, 2019 - January 1, 2019Cybersecurity Bootcamp, Information Technology at Ironhack
April 1, 2026 - June 30, 2026Accessible Documentation Course at Fundación ONCE
October 1, 2024 - November 30, 2024Design Thinking at Ilunion
April 1, 2024 - April 30, 2024CSS Master: Responsive, SASS, Flexbox, Grid & Bootstrap at Udemy
April 1, 2022 - July 31, 2022Master in Digital Marketing at IEBS Business School
January 1, 2020 - January 1, 2020Qualifications
Accessible Documentation Course
October 1, 2024 - November 30, 2024Cybersecurity Bootcamp, Information Technology
April 1, 2026 - June 30, 2026Design Thinking
April 1, 2024 - April 30, 2024CSS Master: Responsive, SASS, Flexbox, Grid & Bootstrap
April 1, 2022 - July 31, 2022UX/UI Design Bootcamp
January 1, 2019 - January 1, 2019Master in Digital Marketing
January 1, 2020 - January 1, 2020Industry Experience
Telecommunications, Healthcare, Retail, Non-Profit Organization, Professional Services, Other
Experience Level
Hire a Product Designer
We have the best product designer experts on Twine. Hire a product designer in Madrid today.