Whilst Mercator with be hiring across a variety of professional roles throughout the year, we're currently inviting applications for this role to be submitted throughout April (deadline midday Thursday 1st May with face-to-face interviews in our London office with successful candidates to be arranged the following week.

Interaction Designer

We’re on a mission to transform digital services

We’re waving goodbye to traditional consulting approaches and creating something special at Mercator. Ranked as one of the UK’s Best Medium Sized Workplaces and among Europe’s top 100 Best Workplaces, we’re not just another consultancy, we’re here to make digital services work for everyone.

With our innovative solutions and award-winning culture, combined with nearly 20 years of experience delivering transformative projects, we have a long history of creating exceptional outcomes for organisations across both public and private sectors. Our client portfolio includes HMRC, major central government departments, and leading private sector enterprises.

We’re not just about delivering projects – we’re here to solve problems and transform services, bringing the Mercator touch to digital transformation.

Team Mercator

We’re a global team of over 400 specialists, with our headquarters in the UK and growing offices across the US, Europe, and Asia. Our culture is built on six core values that define who we are:

🎯We don’t stand still: Always evolving, making bold choices
💫We keep it real: Straightforward, open, and honest in everything
🤝We take care: Supporting each other, our work, and our partners
🌟It’s a joint effort: Building strength in unity
✨We own our actions: Empowering accountability
🎓We bring out the best: Sharing knowledge and helping everyone grow

Role Overview

We’re looking for talented Interaction Designers to join our growing Design team. As an Interaction Designer at Mercator, you’ll play a vital role in creating intuitive, accessible, and effective user interfaces for digital services that serve millions of users across the UK public sector.

Working within multidisciplinary teams, you’ll help transform complex processes into simple, user-friendly digital experiences. You’ll create user flows, wireframes and interactive prototypes, collaborating with researchers, designers and developers to ensure services meet user needs and government standards. This is an excellent opportunity for someone with design experience looking to make a real difference to public services.

What You’ll Do

Create user flows, wireframes, and interactive prototypes using HTML and CSS to
demonstrate how users will interact with services
Work closely with User Researchers to understand user needs and behaviours, absorbing and synthesising research insights to inform design decisions
Design accessible interfaces that work across different devices and platforms
Contribute to and maintain design systems and pattern libraries
Lead design activities for services, providing direction and establishing design patterns
Participate in user research sessions and usability testing
Iterate designs based on user feedback and research insights
Coach others in design thinking and prototyping techniques
Collaborate with content designers, developers, and other team members in multidisciplinary Agile teams
Handle stakeholder relationships and manage expectations effectively
Identify and effectively work within constraints, challenging them where appropriate
Help ensure designs meet government accessibility requirements and service standards
Document design decisions and maintain design documentation

What You’ll Bring

Essential Skills & Experience:

Design Foundations: Strong understanding of user-centred design principles and interaction design patterns
Journey Mapping: Experience using collaborative tools such as Mural and Figma to map user journeys and workflows
Accessibility: Thorough understanding of accessibility standards and inclusive design principles
Prototyping: Ability to create dynamic and interactive prototypes using HTML and CSS to demonstrate user journeys
Communication: Clear written and verbal communication skills for explaining design decisions
Collaboration: Experience working as part of a team of multidisciplinary teams in Agile environments
Problem-solving: Analytical approach to understanding and solving design challenges
Strategic Thinking: Ability to understand the bigger picture and translate it into practical design solutions
Leadership: Experience contributing to the development of design concepts and guiding others
User Research Integration: Ability to absorb and synthesise large amounts of information to produce simple designs

Desirable Skills & Experience:

Experience with the GOV.UK Prototype Kit
Experience with the GOV.UK Service Manual and Design System
Previous experience in user research or usability testing
Portfolio demonstrating interaction design work
Experience with responsive design
Knowledge of service design principles
Experience implementing and extending the GOV.UK Design System
Experience working on complex government services
Experience conducting design reviews and providing constructive feedback
Ability to mentor other designers

What Makes You a Great Fit

We’re looking for someone who is passionate about creating excellent user experiences. You should be naturally curious about how users interact with digital services and enthusiastic about making them better. You’ll bring a strategic mindset and the ability to navigate complex stakeholder relationships, with a track record of delivering high-quality design solutions.

You’ll thrive here if you enjoy collaborating with others, are open to feedback, and are committed to creating accessible and inclusive designs. You balance creativity with pragmatism, finding elegant solutions to design challenges while working within technical and policy constraints.

What’s in it For You

💰 Competitive salary (£30,000 – £72,000) based on experience
🎓 5% of your salary as a personal training budget
🚗 Electric car scheme (including for your partner!) with tax and NI savings
🏥 Enhanced maternity and paternity packages above statutory requirements
🎉 25 days holiday + bank holidays + your birthday off + 2 volunteering days
🚲 Cycle to work scheme through Green Commute Initiative
🤝 Employee Assistance Programme with 24/7 access to confidential support
💰 5% company pension contribution through Royal London
⚡ 4x salary life cover from day one
🎪 Packed social calendar including parties, quizzes, and team events
🏢 Modern offices in prime locations
🏠 Flexible hybrid working combining office and remote work

Location & Working Style

We’re headquartered in the UK with a flexible approach to work:

Client-side working when required
Hybrid working combining office and remote options
Regular team collaboration opportunities

Your Application Journey

Submit your application through our application form
Initial conversation with our talent team
Introductory conversation with role-specific lead
Formal interview with a role-specific technical assessment

Ready to Transform Digital Services?

Submit your application including:

Your CV
Relevant portfolio or work examples (if applicable)

Questions? Contact us at careers@mercator.group 📧

Mercator is committed to creating an inclusive workplace and welcomes applications from all qualified individuals. We believe diverse perspectives make us stronger and better equipped to serve our clients.

Apply here