JOÃO CARLOS QUINTINO

Spearheaded the full lifecycle design and successful launch of Shopify's Customer Accounts platform, replacing a fragmented legacy system and implementing a secure passwordless experience that significantly reduced support tickets and drove 150% GMV growth in the B2B market.

Designed and integrated cohesive identity and authentication workflows, unifying experiences across checkout, customer accounts, and merchant branding for both web and mobile platforms.

Championed user-centered design methodologies, conducting comprehensive research, usability testing, and iterative prototyping using Figma and Cursor to validate solutions and enhance user satisfaction.

Established and disseminated scalable design frameworks, comprehensive guidelines, and robust component standards, significantly improving design consistency and development efficiency for internal and third-party developers.

Directed UX strategy for critical extensibility features within the Checkout and Accounts editor, including the unified Apps Tab and active inspector, empowering merchants to customize Customer Accounts pages.

Fostered cross-functional collaboration with distributed teams across North America and Europe, ensuring consistent product quality, strategic alignment with user needs, and achievement of business objectives.

Orchestrated the UX/UI strategy for Apple's CarPlay Certification Test App, successfully transforming an MVP into a global modular tool that tripled partner adoption and secured critical long-term contracts.

Designed comprehensive end-to-end user workflows and high-fidelity prototypes, delivering intuitive experiences across iOS, macOS, and web platforms.

Developed and continuously evolved a scalable design system, encompassing visual frameworks and robust pattern libraries, which enhanced consistency and efficiency across multiple product teams.

Mentored and guided over 15 students in CESAR's International SummerJob Program, facilitating skill development through interactive workshops and hands-on real-world design challenges.

Collaborated strategically with engineering, QA, and product management teams to define precise user stories and actively support agile delivery roadmaps, ensuring timely and effective product development.

Delivered impactful user-centered visual design solutions for a portfolio of global clients, including industry leaders such as Samsung, Fiat, Motorola, and Apple.

Managed the end-to-end product design lifecycle, from initial research to final delivery, producing detailed wireframes, user flows, and high-fidelity interfaces.

Defined and implemented cohesive visual languages for diverse multi-platform applications, encompassing comprehensive icon sets, UI assets, and detailed style guides.

Functioned as a key shared design resource, actively contributing to multiple concurrent agile and cross-functional projects to ensure design excellence and consistency.

Specialized in UI design for Android themes and applications, concurrently contributing as a visual artist for Samsung Smart TV and mobile games, enhancing visual appeal and user engagement.

Created and delivered a wide range of visual assets, including detailed storyboards, character designs, immersive environments, and comprehensive game assets.

Collaborated closely with development and QA teams to ensure and maintain visual consistency and quality across diverse platforms.

Designed and developed engaging widgets, themes, and applications specifically for Samsung's Wave and BadaOS mobile platforms.

Produced a variety of visual elements, including custom icons, illustrations, and critical UI components for both mobile and Smart TV products.

Acquired foundational expertise in multi-platform design principles, visual systems development, and usability best practices, setting a strong basis for future roles.