Senior JavaScript Engineer | DataGrid & Charting Libraries | London

Frontend Systems Engineer – DataGrid & Visualisation Libraries | London (Hybrid)

£150,000 – £200,000 + package

Most engineers build applications.

This team builds the components those applications rely on.

I’m hiring for a developer tools company building widely adopted JavaScript components used in data-intensive applications across global enterprises, financial institutions, and technology companies.

This is core engineering work, focused on performance, scalability, and building systems that operate at the limits of the browser.

What you’ll be working on

• Developing and optimising a high-performance DataGrid and charting library used globally
• Solving complex problems around rendering, large datasets, and real-time updates
• Working across data structures, algorithms, and performance-critical code paths
• Contributing to both grid and visualisation components
• Building features end-to-end — from design through to release
• Shaping the direction of widely adopted developer tooling

What they’re looking for

• Strong JavaScript and TypeScript fundamentals (framework-agnostic mindset)
• Experience with a statically typed language (C++, C#, Java, Python, etc.)
• Deep understanding of algorithms, data structures, and software design
• Experience building complex systems — not just application-layer UI
• Familiarity with React, Angular, or Vue (and how they interact with the DOM)
• Ability to reason about performance, memory usage, and rendering behaviour
• High standards for code quality, maintainability, and correctness

Why this role stands out

• You’ll work on core libraries used by thousands of engineering teams worldwide
• The problems are genuinely challenging — performance, scale, and architecture
• Engineering-led culture with a strong emphasis on quality and ownership
• Flat structure, minimal bureaucracy, and high autonomy
• Real impact on a product used in mission-critical environments

Package

• £150,000 – £200,000 base salary
• Private healthcare, pension, and additional benefits
• Hybrid working (London-based)
• High-spec hardware and developer-focused environment

If you enjoy solving technically challenging problems around algorithms, recursion, and performance, apply or get in touch for a confidential conversation.