Core JavaScript / TypeScript Engineer - London - Hybrid

Typescript Engineer (with C++ / Java / C# exposure) – London

Location: London (Hybrid – 2 days WFH)

Salary: £150,000 – £200,000 (Permanent). Pension, private healthcare, gym membership, 25 days + 8 BH holiday allowance, tech/hardware budget.

A high‑growth software company is building the gold standard in UI frameworks and data‑intensive visualisation technology. With millions of weekly downloads and adoption by the world’s largest financial institutions and technology businesses, their product powers mission‑critical applications across the Fortune 500.

What you’ll do

• Design and optimise a high‑performance UI framework used globally in real‑time applications.
• Solve deep algorithmic and architectural challenges in rendering, scalability, and memory efficiency.
• Own features end‑to‑end: design, code, test, release, and iterate.
• Contribute to a product used by developers and enterprises worldwide.

What you’ll bring

• Strong knowledge of data structures, algorithms, and performance optimisation.
• Experience with frameworks like React, Angular, or Vue, and a deep understanding of DOM internals and rendering pipelines.
• A systems‑level mindset: diagnosing bottlenecks, eliminating memory leaks, optimising rendering and throughput.
• Passion for building scalable, developer‑facing libraries and frameworks, not just apps.
• Shape the future of UI frameworks at massive scale, tackling problems most engineers never encounter.
• Competitive salary £150,000 – £200,000 plus bonus and benefits.
• Hybrid work model: central London office, two days WFH.
• Premium benefits: private healthcare, pension, gym membership, cutting‑edge hardware.

If you’re ready to engineer the engines behind some of the world’s most demanding applications, we’d love to hear from you.

Apply now and build technology trusted by the Fortune 500.

Seniority level

Mid‑Senior level

Employment type

Full‑time

Job function

Information Technology

Industries

IT System Custom Software Development, Software Development and Technology, Information and Media