Senior Frontend Engineer in Slough

About Us

Every business needs to know who they are really working with whether it is suppliers, investors, partners, or third parties. At Xapien, we are reinventing how organisations do that, combining speed, scale and accuracy with cutting-edge AI. Since 2018, we have grown from a deep-tech startup to a global player in AI-driven due diligence and risk intelligence. 2024 was a landmark year as we closed a $10M Series A, earned recognition in the Chartis RiskTech100 and Everest Group's Leading 50TM, and expanded our products, markets and customer base. 2025 was even bigger: With new regulations, rising compliance pressure and growing reputation risks, organisations everywhere are demanding smarter, faster ways to work and they are turning to us. Customers worldwide from global law firms and private banks to universities and nonprofits rely on Xapien to turn days of manual research into trusted insights, delivered in minutes.

Our momentum so far:

• Customers in a diverse range of industries, with particular growth in wealth management, financial services and supply chain onboarding.
• Demand accelerating beyond our UK headquarters, across multiple continents with new customers in the Middle East, Asia, and Oceania.

Why this is an exciting time to join:

This isn’t just another tech role; it is an opportunity to shape the future of the due diligence industry with a market-leading product trusted by global organisations. Whether you are in marketing, communications, sales, or finance, you will play a critical role in driving growth, building credibility, and defining how we connect our product to a rapidly evolving market. We are scaling fast with more customers, more releases, and bigger regulatory and market challenges. Expectations are rising, due diligence now means real-time insight, delivered efficiently and with impact. You won’t just be executing campaigns, closing deals, or managing numbers, you will be influencing strategy, optimising processes, and helping position a brand that is setting the new standard for trust and transparency. For people who love learning, innovating, and making an impact that matters now is the moment to be a part of Xapien.

The Role:

We are hiring Senior Frontend Engineers to join our Core App team. You will be responsible for building the interfaces and experiences that our users interact with daily, working closely with backend engineers, product managers, designers, and other teams across the organisation. Our frontend stack is modern React with Vite, Turbo, Tailwind CSS, and Storybook. You will work on everything from core user journeys to sophisticated data visualisations, collaborating with teams across engineering including our Investigations, Platform, and Customer Success teams.

What You’ll Do:

• Build responsive, accessible, performant user interfaces using React and modern frontend tooling.
• Collaborate closely with designers to implement pixel-perfect UIs and great user experiences.
• Work with backend engineers to design and consume APIs effectively.
• Write well-tested, maintainable code following established patterns.
• Contribute to our component library and design system.
• Participate in code reviews and help maintain frontend standards.
• Work cross-functionally with other teams to deliver features.
• Debug and optimize frontend performance.
• Mentor junior engineers and share knowledge with the team.
• Build new features and improve existing user journeys.

What We’re Looking For:

Essential:

• 5+ years of professional frontend engineering experience.
• Strong expertise in React and modern JavaScript/TypeScript.
• Deep understanding of HTML, CSS, and web standards.
• Experience building responsive, accessible user interfaces.
• Proficiency with modern frontend build tools and workflows.
• Strong understanding of state management patterns.
• Experience with component-driven development and design systems.
• Commitment to testing and code quality.
• Excellent collaboration and communication skills.
• Self-driven with ability to work independently and as part of a team.

Highly Desirable:

• Experience with our specific stack (Vite, Turbo, Tailwind, Storybook).
• Background in SaaS platforms or complex B2B products.
• Understanding of web performance optimization and monitoring.
• Familiarity with backend technologies to enable better cross-stack collaboration.

Our Tech Stack:

• Framework: React, TypeScript.
• Build Tools: Vite, Turbo.
• Styling: Tailwind CSS.
• Component Development: Storybook.
• Testing: Modern testing frameworks.
• State Management: Modern React patterns.

What Success Looks Like:

In your first 6 months, you will have:

• Independently delivered features with high quality and minimal guidance.
• Contributed meaningfully to the design system and component library.
• Built strong working relationships across Product, Design, and Engineering.
• Made impactful improvements to user experience and code quality.
• Collaborated effectively with backend teams and other engineering groups.

Here’s our promise to you:

• We are going to work with you - to build a rewarding and fulfilling career with the opportunities, challenges and resources you need to do your best work.
• We succeed together - you will own a meaningful part of the business through our employee shares & equity programme.
• Private health insurance to keep you in tip-top condition.
• Life Insurance – let’s hope nobody ever needs this!
• Unlimited holidays – yes, it really is uncapped – take the time you need, when you need it.
• Everyone is learning, developing and challenging themselves so we have a £1k professional development fund per year if you want to learn new skills, even new things outside of work.
• Most importantly of all, we will work with you, to help you realise your fullest potential, always.