
Matías Sandoval
@matassandoval
I turn early-stage product ideas into trusted, conversion-focused web and mobile experiences.
What I'm looking for
I help founders turn rough product ideas into web and mobile experiences that users and investors can trust.
At Stack Builders, I conduct UX/UI audits, maintain scalable design systems, analyze Hotjar feedback, and partner with the web team to improve user touchpoints.
Through my freelance product design work, I've designed intuitive interfaces and modular systems for e-commerce and online education clients. Recent projects include PlusKotas, a two-sided telehealth platform; Northbound, a 156-token design system for an investing app; and UX research and design for Haru, a personal finance app.
I've also improved booking flows, navigation, brand identities, and multimedia campaigns at Studio Reel Ec and AgroPaís. I move quickly with founders who want clear UX, production-ready design, and less process.
Experience
Work history, roles, and key accomplishments
• Conduct UX/UI audits to identify usability improvements for the Stack Builders website.
• Create, modify, and maintain design systems for Stack Builders’ web platforms, ensuring consistency and scalability.
• Analyze user feedback through data-driven tools such as Hotjar, translating insights into actionable design improvements.
• Conduct user research and strategic planning to introduce new
• Development of intuitive, adaptable interfaces for clients in sectors like e-commerce and online education, enhancing accessibility and user engagement.
• Implementation of modular design systems that optimize workflow efficiency and facilitate scalability across projects.
• Conducting competitive and market analysis to advise clients on their digital presence, resulting in improved customer s
• Development of intuitive, adaptable interfaces for clients in sectors like e-commerce and online education, enhancing accessibility and user engagement.
• Implementation of modular design systems that optimize workflow efficiency and facilitate scalability across projects.
• Conducting competitive and market analysis to advise clients on their digital presence, resulting in improved customer s
• Optimization of booking flows and navigation structures for digital platforms, significantly enhancing user retention and satisfaction.
• Collaboration with marketing and development teams to integrate features that boost brand interaction and user engagement.
• Increase in traffic and social media reach by designing user-friendly digital experiences with intuitive navigation.
• Development of complete corporate identities for companies, including logos and visual elements that strengthen brand recognition.
• Design of content for social media and print advertising, contributing to increased brand presence and engagement on digital platforms.
• Support for marketing campaigns, achieving higher sales and visibility through effective multimedia content.
Education
Degrees, certifications, and relevant coursework
Memorisely
AI coding for Designers
2026 - 2026
Memorisely
AI Design Systems
2026 - 2026
Stack Builders
Feedback Guidelines
Issued Mar 2026
Stack Builders
Agile 101
Issued Feb 2025
Stack Builders
I Intend to & Think for me
Issued Jan 2025
ESdesign Escuela Superior de Diseño de Barcelona
Master's in Multidevice UX/UI Web Design, Design & arts
2022 - 2023
Universidad Tecnológica Indoamérica
Ingeniero en diseño digital y multimedia, Diseño multimedia
2015 - 2020
Availability
Location
Authorized to work in
Salary expectations
Social media
Job categories
Skills
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