Founding Frontend Engineer Job Central London area,City Of London England UK,Software Development

Location: City Of London

We're Hiring!

We’re hiring a Founding Frontend Engineer. You will be our first in-house Frontend Engineer, responsible for developing, maintaining, and scaling our user portal – the first thing customers see when engaging with our product. You’ll also be crafting the principles and values we uphold in frontend engineering now and into the future. This is an opportunity to take complete ownership of our frontend stack, work with an incredible team of talented engineers, and help build the future of immunity on the internet.

Your

Responsibilities

Owning the full frontend surface from design system foundations to performance to deployment.

Translating UI/UX designs into clean, efficient, and maintainable code.

Developing accessible and high-performing user interfaces across devices.

Optimising application performance and ensuring cross-browser compatibility.

Identifying, troubleshooting, and resolving front‑end issues efficiently.

Decision making on authentication strategies and secure session/token approaches (e.g. JWT/JWE, token rotation).

Collaboration with designers, developers, and stakeholders to deliver seamless digital experiences.

Enforcing and maintaining best practices in frontend development, including code quality, testing, and performance optimisation.

You Should Have

Strong commercial experience as a front‑end developer, delivering production web applications.

Excellent JavaScript and Type Script skills, with strong experience building UI with React.

Solid HTML5 and CSS skills, including building responsive interfaces that work well across devices and browsers.

Experience working with modern web application patterns, including server‑side rendering (or similar techniques) and performance‑minded UI delivery.

Experience building enterprise‑scalable applications against REST APIs.

Familiarity with common architectural patterns and building maintainable component‑based applications.

It Would Be Nice If You Have

Worked in an early‑stage startup before and know what it feels like when there's no playbook.

Used AI coding tools and know how to leverage them without losing control of the codebase.

Built something data‑heavy (dashboards, tables, real‑time updates) and know where the performance traps are.

Benefits

£75,000 – £90,000 Base Salary
Employee Matched Pension Plan
Stock Option Package
Wellness Budget
Monthly Socials

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