Overview

The Sr. UI Designer will be the design-focused voice at the intersection of design and implementation, co-owning the visual fidelity, interaction quality, and long-term evolution of Epsilon's CORE UI design system. Based in Chicago, this role partners across Product Design and Engineering to push the boundaries of what's possible in enterprise SaaS: from building future-facing prototypes that signal where the product is heading, to shipping production-ready components that improve for every team. You bring deep fluency in design systems, a refined eye for motion and micro-interactions, and a willingness to use AI tools to move faster without sacrificing quality. This is a rare opportunity to define what delightful, modern SaaS looks like from the inside out, at a company where design has a seat at the table.

Responsibilities

• Own the ongoing evolution of Epsilon's CORE UI design system, contributing to its token architecture, component quality, and interaction standards across both Figma and production code.
• Build future-facing prototypes that explore emerging interaction patterns, next-generation UI concepts, and new product directions, communicating vision and intent before a line of production code is written.
• Rapidly iterate on existing components by applying AI-assisted workflows. Use tools like Cursor, Copilot, v0, and generative invention to shorten build-to-code cycles without losing quality or consistency.
• Define and champion a motion language for the product: easing curves, transition choreography, loading states, and micro-interactions that make complex enterprise software feel alive, responsive, and intuitive.
• Partner closely with front-end engineers to close the gap between design intent and production reality, reviewing implementations, writing production-quality CSS and component code when the moment calls for it, and setting a high bar for what 'done' looks like.
• Contribute to the design system's documentation, usage guidance, and adoption, making it easier for every product team to build with consistency and confidence.
• Stay at the forefront of AI-native design practices: identifying where AI tools can accelerate exploration, reduce repetitive work, and enable higher-quality outcomes at scale.
• Collaborate with Product Designers on complex interaction flows, ensuring that every edge case, empty state, and loading moment is thoughtfully designed and accounted for.
• Mentor and set a high standard within the design org, leading by example in design critiques, system reviews, and cross-functional handoffs, and raising the quality bar for the team around you.
• Apply WCAG accessibility standards throughout component and interaction design, advocating for inclusive experiences at the system level.

Qualifications

What you'll bring with you:

• Six or more years of experience in UI development, engineering, creative engineering, or a related hybrid field. A portfolio must show shipped SaaS or digital product work.
• Deep, hands-on experience contributing to and evolving a design system across both Figma (component libraries, design tokens, documentation) and code (React components, Storybook, token pipelines).
• A strong and opinionated motion sensibility: experience designing and implementing micro-interactions, transitions, and animation systems that feel purposeful, polished, and on-brand, not decorative afterthoughts.
• Demonstrated proficiency using AI tools,such as Cursor, GitHub Copilot, v0, Framer AI, or similar to accelerate design-to-code workflows, rapid prototyping, and component iteration.
• Fluency in high-fidelity interactive prototyping, capable of producing experiences that convincingly simulate a final product to validate ideas before full build.
• Working knowledge of HTML, CSS (including animations, transitions, and custom properties), and JavaScript/TypeScript sufficient to implement and critically review production UI.
• Excellent visual design judgment: typography, spacing, color, density, and layout decisions that hold up at both the component and product-surface level.
• An accessible online portfolio featuring live, interactive work and demonstrated motion and interaction work, not only static screens.

Why you might stand out from other talent:

• You've built or significantly contributed to a design system that scaled across multiple product teams and you have strong, battle-tested opinions on what makes a system actually get adopted, not just built.
• Your portfolio includes motion and interaction work: easing references, transition demos, or prototypes where the 'how it moves' was as deliberate and considered as 'what it looks like.'
• You've used AI tools not just to write code faster, but to fundamentally change how you explore, prototype, and validate design directions, treating AI as a creative partner, not a shortcut.
• You are equally comfortable opening a Figma file to iterate on a component's states as you are opening a code editor to implement that same component in code.
• You believe enterprise SaaS deserves the same level of interaction polish as the best consumer apps, and you've made that argument and shipped the proof.
• You've created design system documentation and component stories that designers and engineers actually want to use.
• You think in systems: you see a one-off component request as an opportunity to introduce a durable pattern rather than solve an isolated problem.
• You have experience with motion libraries (Framer Motion, GSAP, CSS @keyframes) and know how to balance performance with visual delight in production environments.
• You've contributed to or led prototyping initiatives that shaped product strategy, not just validated existing decisions.

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Additional Information

Compensation Range: USD $67,800.00 - USD $126,000.00/Annually. This is the pay range the Company believes it will pay for this position at the time of this posting. Consistent with applicable law, compensation will be determined based on the skills, qualifications, and experience of the applicant along with the requirements of the position, and the Company reserves the right to modify this pay range at any time. Temporary roles may be eligible to participate in our freelancer/temporary employee medical plan through a third-party benefits administration system once certain criteria have been met. Temporary roles may also qualify for participation in our 401(k) plan after eligibility criteria have been met. For regular roles, the Company will offer medical coverage, dental, vision, disability, 401k, and paid time off. The Company anticipates the application deadline for this job posting will be 9/9/2026.