Sr UI Motion Designer

UI Motion Designer

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Job Overview

This role makes motion a core part of Mint Mobile & Ultra Mobile's digital experiences by designing principled, scalable UI motion across web and native app surfaces. It involves using AI tools to create motion prototypes, animated interactions, reusable motion patterns, and streamline handoff to engineering. The role requires close collaboration with experienced designers, the design system manager, and engineering to ensure motion solutions align with technical constraints and project requirements. Success is measured by the consistent, accessible, and on-brand application of motion across Mint Mobile & Ultra Mobile's digital ecosystem. The work impacts organizational outcomes by improving usability, elevating product quality, and establishing Mint Mobile and Ultra Mobile's motion design language as a scalable, reusable system.

Job Responsibilities

• Design and deliver animated component prototypes, motion interactions, icon animations, transitions, and production-ready motion specifications that clearly communicate UI behavior, enhance engagement, simplify sophisticated interactions, and maintain consistent motion across the digital ecosystem.
• Leverage AI tooling and emerging motion technologies to rapidly prototype, visualize, test, and iterate on motion concepts while streamlining documentation, developer handoff, and implementation workflows.
• Define and maintain reusable motion tokens, animation principles, motion guidelines, and scalable motion patterns that bring clarity, usability, consistency, and accessibility to interactions across web and app experiences.
• Collaborate with Experience Designers, the Design System Manager, and engineering teams to find opportunities where motion enhances usability, align motion solutions with technical constraints and implementation requirements, and ensure motion is a core part of digital experiences.
• Act as the motion subject-matter expert by writing and maintaining documentation on motion guidelines for the design system; partner with the Design System Manager to host workshops and training sessions that help designers and engineers optimally apply motion across products and platforms.
• Provide feedback and direction to ensure motion solutions are accessible, responsive, on-brand, and aligned with established motion principles, ecommerce and native app guidelines, and emerging trends, tools, and standards in UI motion and interaction design.

Education and Work Experience

• Bachelor's Degree or Certification in Graphic/Web Design, Animation, or Motion Graphics plus 5 years of related work experience OR Advanced degree with 3 years of related experience.
• Other acceptable areas of study include Motion Design, Animation, Interaction Design, Graphic Design or a related field.
• 4-7 years. Related working experience in Motion Design, animating user interfaces for ecommerce websites and native apps.

Knowledge, Skills and Abilities

• Expertise in animating UI elements, icons, transitions and interactions to enhance user engagement and usability.
• Strong understanding of design principles, modern UI patterns, elements, interactions, responsive web design and accessibility standards.
• High proficiency in standardizing animation patterns and creating motion tokens for design systems.
• High Proficiency in Figma, After Effects, Lottie, Rive, Framer, or other motion graphics tool.
• Strong collaboration skills with the ability to work closely with designers and engineers.
• Excellent interpersonal skills with the ability to verbally articulate and write documentation on motion guidelines.
• Attention to detail and a commitment to design and animation quality.
• Understanding of web standards and HTML/CSS.
• Understanding of new AI workflows and tools like Claude or Codex.

Licenses and Certifications

• At least 18 years of age
• Legally authorized to work in the United States

Travel: Travel Required (Yes/No): Yes DOT Regulated: DOT Regulated Position (Yes/No): No Safety Sensitive Position (Yes/No): No Base Pay Range: $97,300 - $175,500 Corporate Bonus Target: 15%

The pay range above is the general base pay range for a successful candidate in the role. The successful candidate's actual pay will be based on various factors, such as work location, qualifications, and experience, so the actual starting pay will vary within this range.

At T-Mobile, employees in regular, non-temporary roles are eligible for an annual bonus or periodic sales incentive or bonus, based on their role. Most Corporate employees are eligible for a year-end bonus based on company and/or individual performance and which is set at a percentage of the employee's eligible earnings in the prior year. Certain positions in Customer Care are eligible for monthly bonuses based on individual and/or team performance.

At T-Mobile, our benefits exemplify the spirit of One Team, Together! A big part of how we care for one another is working to ensure our benefits evolve to meet the needs of our team members. Full and part-time employees have access to the same benefits when eligible. We cover all of the bases, offering medical, dental and vision insurance, a flexible spending account, 401(k), employee stock grants, employee stock purchase plan, paid time off and up to 12 paid holidays - which total about 4 weeks for new full-time employees and about 2.5 weeks for new part-time employees annually - paid parental and family leave, family building benefits, back-up care, enhanced family support, childcare subsidy, tuition assistance, college coaching, short- and long-term disability, voluntary AD&D coverage, voluntary accident coverage, voluntary life insurance, voluntary disability insurance, and voluntary long-term care insurance. We don't stop there - eligible employees can also receive mobile service & home internet discounts, pet insurance, and access to commuter and transit programs! To learn about T-Mobile's amazing benefits, check out

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