Frontend Developer

Frontend Developer – City of London - Fully onsite work!!!!!

The salary on offer for this role is £55,000 - £65,000 per annum

Fully onsite work!!!!!

We’re seeking a Frontend Developer to join our client’s team to build and maintain the development and upkeep of their e-commerce user interface. This role is key to delivering a unified, high-performance customer experience across all channels. Proficiency in modern JavaScript frameworks, client-side security, and mobile deployment techniques is required.

Responsibilities & Skills

• Develop and maintain high-quality, responsive user interfaces for web and mobile using HTML5, JavaScript (ES6+), and advanced CSS.
• Create reusable components and design systems to ensure consistency, accessibility, and scalability across all digital channels.
• Apply modern styling techniques (CSS Grid, Flexbox, SASS/LESS) and optimise performance for Core Web Vitals.
• Build and deploy cross-platform mobile applications (iOS & Android) using frameworks such as React Native or Flutter.
• Implement secure authentication flows, protect against common vulnerabilities (XSS, CSRF), and adhere to OWASP best practices.
• Integrate e-commerce tools and APIs (e.g., Klaviyo, Yotpo) for personalised content and loyalty features.
• Manage complex application state using libraries like Redux or Context.
• Ensure robust testing through unit, integration, and end-to-end automation.

Interested? Please submit your updated CV to Emma Siwicki at Crimson for immediate consideration. Not interested? Do you know someone who might be a perfect fit for this role? Refer a friend and earn £250 worth of vouchers!

Crimson is acting as an employment agency regarding this vacancy