Frontend Engineer

Marchmont Capital Holdings Ltd; Greater London; On-site; GBP 60,000 - 80,000; Full time

Job summary

A financial technology company in Greater London is looking for a professional to architect a new financial modeling platform. You will lead the development of a reactive visual interface using modern technologies such as React, Next.js, and D3.js. The ideal candidate will have experience with UX design and state management, along with a strong cultural alignment with the founder. This position requires the applicant to work in-person and possess valid UK work authorization.

Qualifications

• Cultural alignment with founder's vision and working style.
• Deep experience in visual graph libraries like React Flow or D3.js.
• Familiarity with Next.js 14, TypeScript, and Tailwind CSS.

Responsibilities

• Own the implementation of the visual scripting UI and DAG interactions.
• Create and refine a professional UI with modern UX.
• Manage complex states that sync in real-time with the backend.

Skills

React experience

Visual graph libraries

TypeScript

Next.js

Tailwind CSS

Design-engineer mindset

Job description

The Job

You will be responsible for the interface of a new financial modeling platform. This is mainly a low-latency workspace where analysts build complex modeling logic through a reactive visual DAG.

What you’ll do

• Architect the Workspace: Own the implementation of our visual scripting UI and DAG interactions.
• Visual Language: Create and refine a professional UI with modern UX.
• State Management: Manage complex states that sync in real-time with our backend.

What we’re looking for

• Cultural alignment: You will work closely with the founder in person for long hours; alignment on personality and strategic vision is non-negotiable and the most important consideration.
• Expertise: React experience with deep experience in visual graph libraries (e.g., React Flow, D3.js, or similar).
• The Stack: Next.js 14 (App Router), TypeScript, Tailwind CSS, @xyflow, and Zustand.
• The Eye: A "design-engineer" mindset. You care about ergonomics and interaction latency.
• Experience: Prior experience in knowledge graphs, game engines or building "Canvas-based" productivity tools is a significant plus.
• Work authorization: This job is in-person only and the applicant must have UK work authorization. We do not sponsor visas.