Frontend Engineer (London)

Engineering at hyperexponential

At hyperexponential (hx) we are transforming the traditional insurance industry with our groundbreaking SaaS platform, hx Renew. Insurers use it to build complex mathematical models that enable smarter, faster pricing decisions—whether it’s calculating the cost to insure a global superstar’s concert tour or protecting entire states from natural disasters.

With hx Renew, insurers can rapidly develop and iterate pricing models in Python and React within a modern software environment, free from the burden of legacy tech. What once took months now takes weeks—or even days. This agility has made our product the go-to platform for insurers worldwide.

In just five years, our winning formula has earned the trust of industry giants like Aviva and Top 5 US insurers, as well as cutting-edge innovators like Convex and Inigo. Our engineering team—made up of some of the brightest (and kindest!) minds in the industry—pushes technological boundaries every day through creative innovation and regular hackathons.

Your Mission

Drive user experience and delivery of complex workflows within hx Renew as a frontend specialist embedded in a cross-functional team. Empower modellers, user-developers, and admins by building robust, clear, and reliable interfaces aligned with hx’s design language. Leverage a shared design system to ensure consistency and high quality across UIs. You will champion best practices while collaborating with frontend peers from other hx teams to ensure a consistent and high quality approach, and will have opportunities to contribute to projects in other teams.

As a Frontend Engineer in a Product Team at hx, you will own the end-to-end delivery of new and existing UI features in hx Renew’s workflow and admin management areas. The Product Teams at hx are comprised of a cross-functional breadth of expertise and you will contribute to development discussions for frontend matters – working with the product manager, backend engineers, and designers.

The role requires you to use, extend, and contribute to hx’s component library and design system, which is built on shadcn and tailwind css. You’ll also be part of the wider frontend community at hx – sharing knowledge and collaborating on cross-team challenges. This blend of hands-on focus and community engagement calls for independence, strong communication, and technical versatility.

Key Responsibilities

• Own the development, enhancement, and support of workflow-related UI features in hx Renew’s frontend—using and extending hx’s design system and component library (shadcn + tailwindcss).

• Implement, and maintain accessible UI components for complex user journeys.

• Collaborate with backend engineers and product specialists to clarify requirements and deliver user-friendly solutions.

• Work closely with designers to translate Figma mockups into production-ready components using hx’s design system.

• Engage with frontend engineers from other hx teams: share pattern updates, participate in code reviews. Uphold and strive to improve consistency and standards. Seek out knowledge and guidance from more-experienced colleagues in to support continuous growth and development.

• Support continual improvement of the team’s Product Domain through proactive UI/UX and usability fixes.

• Write and maintain unit, and integration tests; support CI/CD reliability.

• Contribute documentation and share knowledge related to both the team and the wider frontend engineering community at hx.

Required Experience and Skills

• Solid understanding of modern software architecture principles and best practices applied to frontend/web development, including component design, state management, scalability, and maintainability.

• Proficient in JavaScript/TypeScript and React (primary hx frontend stack).

• Experience building and maintaining complex, multi-page SPAs in a commercial setting.

• Capable of extending/maintaining a shared component library, following design tokens and accessibility best practices.

• Skilled in developing, debugging, and optimising UI components for rich business logic (including API integration and data-heavy workflows).

• Able to work with independence under guidance from Senior Engineers and Managers, leveraging knowledge from a distributed community of frontend engineers.

• Familiarity with frontend tooling: vitejs, nx, jest, vitest, testing library

• Competent in test design and maintenance (unit, component, CI/CD).

• Strong written and verbal communication skills.

Bonus points for:

• Practical experience extending or customising shadcn/ui components in production.

• Experience implementing UIs using component libraries and design systems—specifically, with tailwindcss and ideally shadcn.

• Experience implementing accessibility and performance optimisations—especially using tailwindcss utility classes.

• Experience with B2B SaaS, ideally in insurance or finance domains.

• Contributions to shared frontend infrastructure or internal documentation.

What can hx offer?

• Ownership of user-driven features for hx’s core platform in the commercial insurance technology space.

• Ongoing support for technical learning and professional growth—including collaboration around the design system.

• Culture of ownership and proactive problem-solving, where your contributions have impact.

Interview Process

• Initial call with our Talent team to kick things off (30 mins)

• Manager Interview (60 mins)

• Technical Interview – Code Review & Systems Design Whiteboard (120 mins)

• Values Interview (60 mins)

• We offer!

Please note that background checks will be conducted as part of the hiring process to ensure compliance with our governance policies. We handle all background checks sensitively and in full compliance with relevant regulations. All applicant data will be processed in accordance with data protection regulations and our privacy policy.

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