Senior Front-End Engineer | AI-Driven Design System Lead

Jobtailor; Greater London; On-site; GBP 90,000 - 130,000; Full time

Job summary

Sesame is seeking a senior Front-End Engineer to own the client experience end to end, including journey, interaction logic, look and feel, and consistency. You will build dense financial interfaces in React/TypeScript and establish patterns for others while shaping the production design system.

You will collaborate with investment professionals and product teams, review peers’ work, and ensure scalable, performance-driven interfaces under load, with a strong emphasis on AI-assisted design

Qualifications

• 5+ years in front-end engineering, ideally React and TypeScript.
• Experience building and maintaining a design system in production.
• Experience with data-dense interfaces at scale, including virtualised tables, charting, and performance under real load.
• Fluency with AI-assisted development and the specification skill described in the posting.
• Willingness to work directly with users and own the experience, not the implementation alone.
• Comfortable reviewing others’ work, teaching, and holding a quality standard.

Responsibilities

• Own the Sesame experience end to end, including the client journey, interaction logic, look and feel, and consistency.
• Build front-end interfaces, particularly dense and difficult financial interfaces, and establish patterns for others.
• Help develop the production design system in code and influence what belongs in it.
• Define and uphold product look, feel, and consistency through reviews and tooling.
• Engage directly with investment professionals, family offices, and advisors, and act on client feedback.
• Design and build dense financial interfaces with scalable tables, precise numbers, and robust drill-downs under load.
• Define standards and instructions for AI-assisted design and engineering tools.
• Critically review AI-generated output and tighten rules to prevent recurring issues.
• Shape how the product design and engineering process works around AI.
• Review others’ work, teach, and enable consistent quality.
• Collaborate in working sessions with product managers and engineers.

Skills

Front-End Engineering

React

TypeScript

Design System Development

Data-Dense Interfaces

Virtualised Tables

Charting

Performance Optimization

AI-Assisted Development

Quality Review

User Engagement

Collaboration

Tools

Shadcn/ui

AI-Assisted Design Tools

Job description

Sesame is seeking a senior Front-End Engineer to own the client experience end to end, including journey, interaction logic, look and feel, and consistency. You will build dense financial interfaces in React/TypeScript and establish patterns for others while shaping the production design system.

You will collaborate with investment professionals and product teams, review peers’ work, and ensure scalable, performance-driven interfaces under load, with a strong emphasis on AI-assisted design