Senior Product Designer

Sum Up | Product & Design | London, United Kingdom

Competitive salary
· Office-first

Check out our London office

The Consumer Bank squad sits at the heart of one of Sum Up's most exciting growth bets — scaling Sum Up Pay, our consumer fintech product, to millions of active users across Europe. The team owns end-to-end UX and product design across the full user lifecycle, from onboarding and activation through to engagement features like Spaces, Open Banking insights, and budget tracking.

This is a high-craft, high-autonomy environment where design isn't just execution — it's central to defining the problems worth solving, and your work will directly shape adoption, retention, and the future of Sum Up's consumer offering.

• Own end-to-end product design within the Consumer Bank squad, from discovery through to delivery, across the Sum Up Pay mobile experience
• Lead discovery by identifying user problems, framing opportunities, and shaping hypotheses alongside Product and Engineering
• Design intuitive, high-quality mobile experiences in Figma that drive key metrics including activation, engagement, and retention
• Validate solutions through prototyping, user research, and usability testing, using both qualitative and quantitative data to iterate
• Contribute to the design system and help maintain consistency and quality across the product as Sum Up scales its consumer offering

• Proven experience as a Senior Product Designer working on mobile-first consumer products, with a portfolio demonstrating end-to-end UX design and measurable impact
• Strong discovery skills, including problem framing, hypothesis definition, user research, and insight synthesis
• Excellent UX, interaction, and information design skills, with a high bar for quality and usability
• Comfort working autonomously within cross-functional teams alongside Product Managers and Engineers, with solid understanding of technical constraints
• Ability to leverage AI design tools (e.g. for ideation, prototyping, and research synthesis) to accelerate workflows and elevate the quality of outcomes
• Proficiency in Figma and experience contributing to or evolving design systems

Opportunity to work with a truly global, multicultural team from our central London Bridge location. This involves an office-first setup

Commitment to Diversity and Inclusion: be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced

Enrolment onto our Virtual Stock Option programme: you will own a stake in Sum Up's future success

Generous time off: enjoy 28 days of paid leave, plus bank holidays and special leaves

Health matters: private health insurance, including optical and dental

Life made easier: salary-sacrifice commuter benefits via Gogeta

Financial security: retirement scheme (Sum Up matches 7% when you contribute 5%)

Peace of mind: life insurance from Met Life for 2× your salary

Break4me: 1-month sabbatical after 3 years of service

Referral Bonus: earn additional rewards by referring talented individuals to join the Sum Up team

Be empowered to do more that matters.

At Sum Up, we're on a mission to empower small businesses across the globe by providing simple and affordable tools that allow them to thrive. Today, over 4 million businesses in 37 markets rely on Sum Up as their financial partner to manage payments, finance and customer relationships.

Our commitment to small businesses is reflected in our diverse team of over 3,000 Sum Uppers from over 90 nationalities, united by global collaboration and an innovative mindset. Our core values lay the foundation for who we are and what we stand for, shaping…