Senior JavaScript Engineer | DataGrid & Charting Libraries | London

• 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

• 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

£150,000 - £200,000 + package, * 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.