Senior JavaScript / TypeScript Engineer

Overview

🏢 Company | Exchange technology & capital markets infrastructure

👤 Position | Senior JavaScript / TypeScript Engineer

🎯 Impact | Build software used to trade, monitor and manage live financial markets

📏 Size | ~200 people globally

🌟 Stack | JavaScript, TypeScript, React, Python APIs

📍 Location | London

💻 Hybrid | 3 days per week in the office

💰 Offer | Competitive salary + bonus

💎 Benefits | Private medical, 25 days leave, pension, bonus, enhanced family policies, life assurance, income protection, flexible working hours, cycle to work scheme and more.

The Work

Some frontend engineering jobs are about dashboards and admin panels.

This one isn’t.

You’ll be building applications used to operate and monitor live trading infrastructure across multiple financial markets. The systems process large volumes of data and need to remain clear, reliable and responsive at all times.

You’ll work closely with product engineers, infrastructure specialists and QA to build the interfaces used to control complex trading technology. That means turning large streams of market data into tools traders and operators can actually use.

You’ll also get the space to shape how things are built.

You’ll contribute to architecture decisions, guide more junior engineers and work with designers to turn wireframes into applications that feel fast and intuitive even when handling large volumes of information.

The engineering group you’ll join is small enough that your ideas will be heard, but experienced enough that you’ll always have strong people around you to challenge and support your thinking.

And the problems you’ll work on aren’t theoretical.

Your code will sit directly alongside real market infrastructure used by trading firms across Europe.

What you’ll be doing

You’ll spend your time:

• Building responsive frontend applications in JavaScript / TypeScript with React

• Turning complex market and operational data into clear user interfaces

• Working with Python APIs and backend services

• Collaborating with UX designers to bring wireframes into production systems

• Reviewing code and guiding engineers earlier in their careers

• Improving testing, reliability and engineering standards across the platform

What you’ll need

To do this well, you’ll likely bring:

• Strong JavaScript / TypeScript experience with React

• Around 5+ years building frontend applications

• Experience working on data-heavy applications

• Solid understanding of HTML, CSS and modern web fundamentals

• Experience with testing, CI/CD and version control

It helps if you’ve worked in financial markets or trading systems before, but it isn’t essential.

If you understand how to build reliable applications that handle complex data, you’ll be able to learn the domain.

📅 Interview Process | CV Review → Intro Call → Technical Discussion → Final Interview → Offer

If this sounds like the kind of engineering environment you enjoy, apply and we’ll arrange a confidential conversation to talk through the details.