Design Engineer (UX/UI & Front End) - Lead - AI in London

Landytech is on a mission to revolutionise the way that investment managers, asset owners and their advisors access asset information. Powered by Sesame, an industry-leading investment reporting platform, we are helping clients in over 15 countries make informed investment decisions and deliver insights faster. The company is growing rapidly and it’s an exciting time to join, having secured $12M in Series B funding in January 2023. In just four years, it has gone from two co-founders to a team of 80+ staff, with offices in London and Paris. At Landytech, we see diversity as our strength with a team from over 15 countries and 14 languages spoken.

The role involves owning the experience of Sesame end to end — the client journey, the interaction logic, the look and feel, and the consistency of all of it — and to build it. If you are an engineer who has always had a view on how the product should look and behave, this is a role where that judgement is part of the remit rather than a side interest.

How we work:

• AI is used heavily at every stage of both design and engineering, not just at the production end
• Our design system lives in code, used by engineers and AI tooling alike
• Tooling changes every few months and we expect it to

You will have real scope to shape how we work, and to help build the parts that do not exist yet.

What you will shape:

• The front-end experience layer, building the interfaces that matter most, particularly the dense and difficult ones
• The design system, developed in code with the rest of the front-end team
• Look, feel and consistency, ensuring the product feels cohesive
• The client journey, interacting with investment professionals, family offices and their advisors
• Craft in dense financial interfaces, ensuring tables are legible at scale and numbers are precise

The must-have: setting the standard AI works to. The harder problem is making sure what we build expresses the product’s logic, density and intent rather than simply reusing its components. This means defining the standards and instructions our tools work to, reading the output critically enough to see why something is subtly wrong, and tightening the rules so it does not recur.

Strongly valued: design expertise. We are looking for real UX judgement, the ability to critique flows, think in objects, relationships and states before components, and have taste in hierarchy, typography, density, and restraint.

Also valued: product management instincts. Experience in talking to clients directly, deciding what not to build, and owning outcomes will be weighted heavily.

What we are looking for:

• 5+ years in front-end engineering, ideally React and TypeScript, with libraries such as shadcn/ui
• Experience building and maintaining a design system in production
• Data-dense interfaces at scale — virtualised tables, charting, performance under real load
• Fluency with AI-assisted development
• Willingness to work directly with users and own the experience
• Comfortable as an editor and enabler: reviewing others’ work, teaching, holding a line
• Genuine curiosity about finance

Our process includes a portfolio or work conversation, a short practical exercise based on a real Sesame flow, and a working session with a product manager and an engineer. We adapt the steps to the candidate and will always tell you what to expect in advance.

Benefits include competitive salary and stock options, hybrid working, private medical insurance with Bupa for you and your family, death in service insurance option, pension plan with NEST, cycle to work scheme and gym allowance, and office food and drinks with regular socials.