Senior Product Designer (AI Design Agency)

Mustard Navy Ltd.; Greater London; Hybrid; GBP 70,000 - 95,000; Full time

Benefits offered by this job

Competitive base salary

Pension contribution

Learning & Development budget

Hybrid London WeWork

Team events

Flexible working

Industry veterans team

Job summary

Mustard Navy Ltd. is seeking a Senior AI Product Designer to own projects from brief to polished interfaces, with a strong emphasis on visual craft and AI-driven workflows. You’ll help shape design systems and contribute to a culture of experimentation in a fast-growing agency.

You’ll collaborate closely with clients and our team to frame problems, build wireframes, test concepts, and deliver world-class interfaces for data-rich AI products.

Qualifications

• 5+ years across startups, agencies, or product teams.
• Experience with AI-driven workflows and data-rich products.
• Legal right to work in the UK.

Responsibilities

• Own day-to-day product design projects.
• Develop wireframes to test concepts.
• Craft visually stunning interfaces and prototypes.
• Build and evolve design systems.
• Collaborate with Mustard Navy team and clients.
• Present work confidently to stakeholders.

Skills

Product portfolio

Design systems

Frontend & animation

Non-standard UI

AI product design

Critical thinking

Independent work

Tools

Figma

Framer

Sketch

Prototype tools

Job description

Mustard Navy is an award-winning product design agency dedicated exclusively to AI products. We help category-defining founders, scale-ups, and private-equity-backed innovators transform raw, emerging machine learning technology into impactful, human-centric user experiences. From rapid vision prototyping to zero-to-MVP builds in deep tech, health tech, and beyond, we build "Design Intelligence" that scales.

As code gets cheaper, well-crafted interfaces matter more. Graft and craft are what set our work apart, and we want to raise the bar further.

We’re looking for a Senior Product Designer who can own projects and deliver across the board, with a real spike in visual design. You’ll be fluent in AI-driven ways of working, and you’ll have the experience and taste to craft great interfaces without a prompt box. You’ll set the standard for how our work looks and how we critique it, and make everyone around you better. You’ll also help shape who we are, defining our culture and growing the agency with us.

About you

You’re likely a great fit if you:

• Have a portfolio of shipped digital products that goes beyond standard UI patterns, with visual craft you can talk about in detail: typography, layout, hierarchy, colour and motion.
• Can take a project from brief to polished prototype, framing the problem, testing concepts through wireframes, and refining the final interface.
• Understand how designs get built, and have experience with design systems, frontend frameworks or animation.
• Think critically and zoom in and out of problems with ease.
• Are passionate about non-standard interfaces, such as conversational or generative UI, interactive data visualisation, mixed media, and others.
• Understand foundational design principles for AI and data-rich products.
• Are comfortable working with AI throughout your process, and have the taste and judgement to know when its output is good enough, and when it isn’t.
• Explain design decisions confidently, and give and receive critique well.
• Thrive in ambiguity and find paths forward independently.
• Gravitate towards impact-driven outcomes.
• Learn through hands-on experimentation, and enjoy sharing what you find.

Your background might combine startups, agencies, consultancies or product teams, totalling around 5+ years. However, mindset and skills matter more than rigid criteria. You must be legally allowed to live and work in the UK.

What you’ll do

This is a dynamic, hands-on role typical of a fast-growing startup agency. Most days, you’ll:

• Hold day-to-day responsibility of product design projects.
• Understand client context and requirements, assisting in research if required.
• Develop wireframes to test a broad variety of concepts.
• Craft creative, visually stunning interfaces and interactive prototypes.
• Build and evolve design systems that help our clients to scale their products.
• Drive innovation while balancing client constraints.
• Contribute broadly to agency growth and internal initiatives.

Critically, you’ll:

• Work closely with members of the Mustard Navy team to solve complex client challenges and craft world-leading design solutions.
• Stay at the forefront of new technologies, experimenting and researching to help evolve our ways of working.
• Form a core part of our growing team, embracing the culture and collaborating closely to help drive our product design passion.
• Confidently present your work, grounded in past experience working in a client facing role.

Why do we call it “AI” Product Designer?

The term “AI” works a double-shift:

• First is what we work on: We help our clients solve product challenges that take advantage of AI or Machine Learning in one way or another. These are the AI Products we work on.
• Second is how we work: We continuously iterate on how we might best use AI to do our work. We codify and share these practices to become ever more effective and creative.

Joining us means being encouraged to play in both of these areas.

Benefits

Beyond the work with clients at the forefront of tech developments, you’ll benefit from

• Competetive base salary
• Generous 6% employer pension contribution
• Dedicated Learning and Development budget
• Hybrid working: 2 days per week in London’s flagship WeWork in Waterloowith great transport links and all of the Southbank's amenities on our door step
• Monthly team events like exhibition or conference visits and Friday visits to the street food market
• Flexible working to make time for the occasional personal life needs
• Being part of a team of industry veterans with all the camaraderie and shared learning this entails