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  "job_description": "Senior TypeScript Engineer | JavaScript Library / Framework Development | London\n\n£150,000 – £250,000 + pension, private healthcare, gym membership, hardware budget\n\nLondon (Hybrid – 2 days WFH)\n\nA high-growth software company is building the next generation of high-performance UI frameworks and data-intensive visualisation technology. Their products power mission-critical applications used by global enterprises, financial institutions, and technology firms, relied on every day by millions of users worldwide.\n\nThey hire engineers who enjoy working close to the metal of the browser, solving problems that demand a deep understanding of algorithms, runtime behaviour, and performance at scale.\n\nThis is not typical web development. It’s engineering at the limits of what modern browsers can do.\n\nWhat you’ll work on\n• Design and optimise the core runtime of a high-performance UI framework used globally in real-time environments.\n• Push the boundaries of JavaScript, TypeScript, and the browser rendering pipeline to deliver smooth performance on massive datasets.\n• Solve complex engineering challenges around tree structures, recursion, memory allocation, rendering performance, and data-flow architecture.\n• Own features end-to-end, design, build, test, document, and release.\n• Contribute to libraries used by developers and enterprise engineering teams worldwide.\n\nWhat you’ll bring\n• Deep, practical mastery of vanilla JavaScript and TypeScript.\n• Strong exposure to C++, Java, or C#, with a systems-level mindset.\n• A solid understanding of data structures, algorithms, and performance optimisation.\n• Experience building complex, highly scalable systems — not just CRUD interfaces.\n• Familiarity with frameworks such as React, Angular, or Vue, and a strong grasp of how they interact with the DOM.\n• Ability to diagnose bottlenecks, eliminate memory leaks, and optimise rendering and throughput.\n• An appreciation for clean software design, correctness, and maintainability.\n\nWhy this role matters\n• You’ll work on core engineering problems that most developers never get close to.\n• You’ll join a team of deeply experienced engineers with backgrounds across low-level languages and large-scale systems.\n• You’ll operate in a fast, engineering-led culture with minimal bureaucracy and high autonomy.\n• You’ll enjoy a top-tier package, including:\n• £150,000–£250,000 salary\n• Private healthcare\n• Pension\n• Gym membership\n• 25 days holiday + bank holidays\n• High-end hardware budget\n• Central London office with two days WFH each week.\n\nIf you want to engineer the foundations behind some of the world’s most demanding applications, this is the environment built for you. Get in touch!",
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  "job_posted_at_datetime_utc": "2026-03-20T00:00:00.000Z"
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