Senior UX Designer — Systems, Prototyping & Leadership

Adelphi Group; Greater London; On-site; GBP 65,000 - 85,000; Full time

Job summary

Omnicom’s Critical Mass is seeking a Senior User Experience Designer to shape the UX of large-scale digital products. You will craft holistic systems, flows, and interfaces using wireframes, prototypes, and design language documentation, while turning analytics and research into tangible solutions.

You’ll mentor teammates and collaborate with engineers to deliver delightful experiences. You will drive design reviews, studios, and client-facing communication, ensuring milestones are met and

Qualifications

• Senior UX Designer with 3–5 years in UX, product design, or information tech.
• Strong communication and interpersonal skills with client-facing experience.
• Proven ability to deliver wireframes, prototypes, and design specifications.
• Experience leading design reviews, studios, and cross-functional teams.
• Familiarity with WCAG 2.0 AA standards and accessibility best practices.
• Portfolio demonstrating end-to-end digital product design across platforms.

Responsibilities

• Design holistic systems, flows, and interfaces with wireframes and prototypes.
• Gather insights from analytics and research to inform design decisions.
• Guide design team members and collaborate with engineering teams.
• Create and maintain design systems, documentation, and interaction specs.
• Lead mid-level project work with autonomy and accountable milestones.
• Support business development with research and pitch materials.

Skills

UX design

Product design

Communication skills

Interpersonal skills

Team collaboration

Creative problem solving

Time management

Usability testing

WCAG familiarity

Design systems

Education

Bachelor’s degree preferred

Tools

Sketch

Omnigraffle

InVision

Principle

Axure

Keynote

PowerPoint

Adobe Creative Suite

Job description

Omnicom’s Critical Mass is seeking a Senior User Experience Designer to shape the UX of large-scale digital products. You will craft holistic systems, flows, and interfaces using wireframes, prototypes, and design language documentation, while turning analytics and research into tangible solutions.

You’ll mentor teammates and collaborate with engineers to deliver delightful experiences. You will drive design reviews, studios, and client-facing communication, ensuring milestones are met and