UXUI Designer

About BMLL:

BMLL is the leading independent provider of harmonised Level 3 2 and 1 historical data and analytics across global equities ETFs futures and US equity options. We provide market participants with immediate access to granular T1 order book data and advanced analytics enabling them to accelerate research optimise trading strategies and better understand market behaviour.

BMLL was acquired in 2025 by Nordic Capital alongside minority shareholder Optiver marking a joint commitment to accelerate the companys next phase of growth.

We offer an inclusive and collaborative culture a hybrid working environment that includes regular days in our London office weekly team lunches and a variety of out-of-hours social activities.

For more information visit our website or follow us on X (@bmlltech) and Linked In @ bmll

About the Role:

BMLL facilitates its clients access to its petabytes of granular data and derived insights via three main products: BMLL Data Lab BMLL Data Feed and BMLL Vantage a leading financial data visualisation application. We are looking for an experienced UX Designer to take ownership of the user experience across our software estate ensuring a consistent high quality look and feel that is aligned with our brand and the needs of our users.

This is a central design role working across multiple products. You will own and evolve our design system and UX guidelines collaborate closely with product engineering and marketing and help shape the design direction of our fast-growing Fin Tech business that serves some of the largest financial institutions in the world.

As this is a technical product involving complex financial concepts an interest in finance is desired and experience designing for data heavy applications will be beneficial.

Key Responsibilites:

• Own and evolve the BMLL design system and UX standards ensuring consistent adoption across Data Lab Data Feed Vantage and associated Admin tools
• Collaborate with engineering and product teams to deliver intuitive high quality designs for new features and UI enhancements
• Work closely with the marketing team to translate brand principles into consistent product experiences across the software estate
• Conduct user research and usability testing to inform design decisions
• Create wireframes and high fidelity prototypes
• Contribute to product requirements and define UX standards and best practices across the business

Key Requirements:

• 3 years of experience in product or UX design ideally in a B2B SaaS context
• Experience owning or contributing significantly to a corporate design system and / or UX guidelines and information architecture
• Strong hands-on Figma skills
• Demonstrated ability to work autonomously across multiple products or work streams
• Strong communication skills with the ability to articulate design decisions to both technical and non technical stakeholders
• Comfortable navigating competing priorities across multiple teams
• Pragmatic and delivery focused able to balance ideal design with real-world constraints
• Collaborative by nature with the confidence to advocate for the user in cross-functional discussions
• Ability to work in a fast-paced deadline-driven environment

Desirable Skills:

• Exposure to financial services markets or concepts e.g. equities options and futures
• Basic understanding of web development technologies like HTML & CSS
• Experience of Agile software development
• Experience with charting libraries or visualisation tools and understanding how design choices affect chart readability and performance
• Experience with Figma Make or Claude Design
• Experience designing for an international user base

• Competitive salary
• 25 days holiday plus bank holidays
• Discretionary Bonus
• Pension Scheme
• Private Medical Insurance
• Work…