Senior Interaction Designer

Business Unit
: GAIN Experience
:
We create user-centered experiences that drive measurable business impact for public and private sector organisations.
Team
:
Design
Reporting to: Director of Design
Location
:
Hybrid – offices in Bristol and London

ABOUT:
GAIN is a creative-led, insight-driven company that blends data, tech and creativity. We believe the best ideas emerge where intelligence and creativity unite, where insight sparks imagination, and where innovation turns possibility into progress.

We are explorers of new frontiers, shaping bold strategies that move people, brands, and businesses forward. Individually and together, our specialist teams provide the vision, data, and confidence brands and organisations need to make braver, more impactful decisions.

Today as GAIN, we work as a united force, using data to fuel creativity, and technology to unlock new possibilities. As imagineers we don’t just embrace innovation – we engineer it, transforming information into action, and ideas into breakthroughs.

This is where rebel thinking, smart technology, and data-driven creativity shape the future.

Through our five specialist teams:

Creative Studio,Conversion,Customer Science,Experience and Performance. Individually, and together, we work to fuel your growth, and deliver measurable impact.

Our Experience team has a strong and growing presence in the public sector, working with UK government departments and arm's length bodies to design and deliver high-quality, accessible digital services. We work within GDS standards, Design System principles, and agile delivery frameworks to create services that genuinely work for the people who use them.

THE ROLE:

We’re looking for a Senior UX Designer with a strong track record of working within UK government digital services to join our Experience team. This is a practitioner-level role aligned to the GDS Interaction Designer career framework. You'll be a skilled, confident designer who can lead complex interaction design work across agile delivery teams, helping government clients design and iterate services that meet the Digital Service Standard.

You’ll work collaboratively and openly with multidisciplinary delivery teams, user researchers, content designers, service designers, product owners, and engineers, playing an active, hands‑on role throughout discovery, alpha, beta, and live service phases. You’ll bring deep knowledge of the  Design System, a rigorous commitment to accessibility and inclusion, and the ability to communicate design decisions clearly with technical and non-technical stakeholders.

As a senior practitioner, you’ll also help to develop GAIN's public sector design practice, mentor mid‑weight and junior designers, and contribute to bids and proposals for new government work. You’ll bring a genuine curiosity about how AI, agentic tools, and emerging ways of working are reshaping the design and delivery landscape, contributing to how we evolve our practice, our design systems, and our ways of working to stay ahead of a rapidly changing field.

• Lead interaction design across complex government service projects, taking ownership from discovery and prototyping through to live service, in line with GDS phases and the Digital Service Standard
• Design and iterate user flows, wireframes, screen designs, and high‑fidelity prototypes using the  Design System components, patterns, and guidance contributing back to the system when new patterns are needed
• Create low and high‑fidelity prototypes (using  Prototype Kit or Figma) that can be used directly in user research sessions and presented to stakeholders
• Apply interaction design best practices informed by GDS Interaction Designer role expectations, including understanding users  end‑to‑end journeys, designing for edge cases, and iterating based on evidence
• Make design decisions based on user research findings, analytics, and accessibility audits, clearly documenting and communicating the rationale behind them
• Design for the full range of users, including those with low digital literacy, limited English, or who rely on assistive technologies, embedding inclusion into the design process from the…