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- Tasks: Design and optimise a high-performance JavaScript/TypeScript library for global applications.
- Company: High-growth software company engineering next-gen UI frameworks.
- Benefits: £150,000 – £200,000 salary, private healthcare, gym membership, and 25 days holiday.
- Other info: Hybrid working in central London with high autonomy and career growth.
- Why this job: Work on complex problems and make a real impact in a technical team.
- Qualifications: Strong JavaScript/TypeScript skills and experience with complex systems.
The predicted salary is between 150000 - 200000 £ per year.
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. This is not typical web development. You’ll be working at the level where performance, architecture, and browser behaviour actually matter.
What you’ll be doing:
- Designing and optimising the core runtime of a high-performance JavaScript/TypeScript library
- Working directly with the browser rendering pipeline to handle large, real-time datasets
- 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:
- Strong, hands-on experience with JavaScript and TypeScript (framework-agnostic mindset)
- 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
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!
Senior Frontend Systems Engineer (TypeScript) | UI Frameworks in London employer: techstack Recruitment
Contact Detail:
techstack Recruitment Recruiting Team
StudySmarter Expert Advice 🤫
We think this is how you could land Senior Frontend Systems Engineer (TypeScript) | UI Frameworks in London
✨Tip Number 1
Network like a pro! Reach out to folks in the industry, attend meetups, and connect with people on LinkedIn. You never know who might have the inside scoop on job openings or can refer you directly.
✨Tip Number 2
Show off your skills! Create a portfolio showcasing your projects, especially those involving TypeScript and UI frameworks. This is your chance to demonstrate your hands-on experience and problem-solving abilities.
✨Tip Number 3
Prepare for technical interviews by brushing up on algorithms, data structures, and performance optimisation. Practice coding challenges and be ready to discuss your thought process when tackling complex problems.
✨Tip Number 4
Apply through our website! We love seeing candidates who are genuinely interested in our company. Tailor your application to highlight your relevant experience and how you can contribute to building next-gen UI frameworks.
We think you need these skills to ace Senior Frontend Systems Engineer (TypeScript) | UI Frameworks in London
Some tips for your application 🫡
Tailor Your CV: Make sure your CV highlights your experience with JavaScript and TypeScript, as well as any work you've done on complex systems. We want to see how your skills align with the role, so don’t be shy about showcasing relevant projects!
Craft a Compelling Cover Letter: Your cover letter is your chance to tell us why you're the perfect fit for this role. Share your passion for building UI frameworks and mention specific challenges you've tackled in the past that relate to performance optimisation and data handling.
Showcase Your Problem-Solving Skills: In your application, highlight instances where you've solved complex problems, especially around algorithms and data structures. We love seeing how you think through challenges, so give us some juicy examples!
Apply Through Our Website: We encourage you to apply directly through our website. It’s the best way for us to keep track of your application and ensure it gets the attention it deserves. Plus, it shows you’re keen to join our team!
How to prepare for a job interview at techstack Recruitment
✨Know Your Tech Inside Out
Make sure you’re well-versed in JavaScript and TypeScript, as well as any frameworks you’ve worked with. Brush up on your understanding of algorithms, data structures, and performance optimisation techniques. Being able to discuss these topics confidently will show that you’re not just familiar with the tools, but you truly understand how they work.
✨Showcase Your Problem-Solving Skills
Prepare to discuss specific challenges you've faced in previous roles, especially those related to performance issues or complex system designs. Use examples that highlight your ability to identify bottlenecks and optimise effectively. This will demonstrate your hands-on experience and systems-level thinking.
✨Understand the Bigger Picture
Familiarise yourself with how UI frameworks interact with the DOM and the browser rendering pipeline. Be ready to explain how your work impacts the overall performance and user experience of applications. This shows that you’re not just focused on coding, but also on how your contributions fit into the larger context.
✨Ask Insightful Questions
Prepare thoughtful questions about the company’s projects, team dynamics, and the technologies they use. This not only shows your interest in the role but also gives you a chance to assess if the company is the right fit for you. It’s a two-way street, so make sure you’re engaging in the conversation!