Senior TypeScript Engineer | Developer Tools & UI Infrastructure | London

techstack Recruitment; Greater London; On-site; GBP 150,000 - 200,000; Full time

Benefits offered by this job

Pension

Private healthcare

Gym membership

High-spec hardware

25 days holiday + bank holidays

Job summary

A leading technology recruitment firm seeks a Senior Frontend Systems Engineer to build and optimise innovative UI frameworks. This hybrid role in London involves solving complex data problems and contributing to software used in critical applications globally. Candidates should have experience with systems-level programming and performance optimization. The package includes a competitive salary, pension, private healthcare, and a substantial hardware budget, making it an excellent opportunity for technically-minded engineers seeking high autonomy and real impact.

Qualifications

• Solid understanding of algorithms and data structures.
• Experience building complex systems beyond standard web apps.
• Ability to debug performance issues and optimise effectively.

Responsibilities

• Solve complex problems around data structures and memory usage.
• Build features from design through to release.
• Contribute to a product used by engineering teams globally.

Skills

C++

Java

C#

Algorithms

Data structures

Performance optimisation

React

Angular

Vue

Job description

Senior Frontend Systems Engineer (TypeScript) – UI Frameworks | London

£150,000 – £200,000 + pension, private healthcare, gym membership, hardware budget

London (Hybrid – 2 days WFH)

Most frontend roles sit on top of frameworks.

This one builds them.

A high-growth software company is engineering a next-generation UI framework and data visualisation platform used in mission-critical environments by global enterprises, financial institutions, and technology companies.

Their products power applications used by millions of users every day.

What you’ll be doing

• Solving complex problems around data structures, recursion, memory usage, and rendering performance
• Building features end-to-end — from design through to release
• Contributing to a product used by engineering teams globally

What they’re looking for

• Background in C++, Java, or C# — or a clear systems-level way of thinking
• Solid understanding of algorithms, data structures, and performance optimisation
• Experience building complex systems (not just standard web apps)
• Good understanding of how frameworks (React, Angular, Vue) interact with the DOM
• Ability to identify bottlenecks, debug performance issues, and optimise effectively
• High standards around code quality, design, and maintainability

Why this role stands out

• You’ll work on problems most frontend engineers never get near
• You’ll be part of a deeply technical, engineering-led team
• High autonomy, low bureaucracy
• Real impact on a product used globally

Package includes

• Pension
• 25 days holiday + bank holidays
• High-spec hardware
• Central London office (hybrid working)

If 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!