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Senior UI/UX Designer at First Principles. About First Principles. First Principles is a forward-thinking product consultancy that creates radical value for ambitious, emerging technology startups. We provide product leadership and strategic support, blending cutting-edge technology with thoughtful design principles to shape tomorrow's products. Our team thrives on curiosity, empathy, and continuous improvement, using design as a strategic driver for innovation and growth.. About the Role. We're looking for a Senior UI/UX designer to join one of our high-performing, AI-first product teams. You'll be part of a small, focused team of product leaders and designers, working in one-week sprints on various projects for a dedicated client. Each week brings new challenges and objectives within your client's product ecosystem, requiring both adaptability and strong design skills.. As a Senior UI/UX Designer, you'll create modern user experiences using AI to enhance your work. You'll turn complex business needs into clear, beautiful interfaces that help shape the future of digital products.. Core Responsibilities. . Create innovative designs that could go viral through their unique appearance or functionality. . Use AI tools to improve your design workflow (including image generation, animation, copywriting, and Figma AI features). . Create high-quality designs and prototypes in Figma, using components, auto-layout, and animations. . Lead rapid prototyping sessions, creating and updating designs in real-time during client workshops. . Guide the full design process from research to final UI design. . Build and maintain a design system that keeps projects consistent and scalable. . Document your AI-enhanced design processes to help train new team members. . Join client meetings to share insights and ask helpful questions. . Qualifications. Required. . 7+ years of professional UI/UX design experience in product-driven environments. . Expert-level proficiency in Figma and modern design tools. . Demonstrated experience using AI tools to enhance design workflows. . Fluent English communication skills (speaking and writing). . Ability to work US hours (9am-5pm in any US timezone). . Location: Based in South/Central America. . Strong portfolio showcasing user-centered solutions and clear design processes. . Proven ability to work independently or as part of a design team. . Experience with rapid prototyping and iterative design processes. . Preferred. . Experience with B2B SaaS, productivity tools, Ed-Tech, or consumer-facing digital products. . Degree in HCI, Interaction Design, Graphic Design, or related field. . Familiarity with front-end frameworks and technical feasibility considerations. . What Sets You Apart. . Ability to create novel, potentially viral designs that challenge conventional patterns. . Strong understanding of typography, color theory, layout, and visual hierarchy. . Excellence in fast-paced, agile environments while maintaining high design standards. . Proactive approach to staying current with industry trends and emerging technologies. . If you're passionate about pushing the boundaries of modern digital design and excited about leveraging AI to create exceptional user experiences, we want to hear from you. Join us in designing a future where technology is more intuitive, human, and impactful.. Company Location: Colombia.