Frontend Engineer

The Role

We're seeking a Mid-Level Frontend Engineer to join our existing frontend developer and help build the next generation of our verification and content moderation interfaces. You'll work on customer-facing applications that balance security, compliance, and conversion optimisation—where every UI decision impacts both user trust and business outcomes.

This is an opportunity to work on meaningful problems: building interfaces that verify age and identity while respecting user privacy, creating accessible content moderation tools for trust and safety teams, implementing cutting-edge technologies and optimising verification flows that serve millions of users.

What You'll Work On:

Verification & Content Moderation Interfaces

• Build and optimise multi-method verification flows
• Create intuitive, efficient content moderation tools for trust and safety teams to review and manage user-generated content
• Implement workflows for AI-powered face matching, age verification, and content analysis systems
• Develop real-time validation and feedback systems that guide users through verification processes
• Design interfaces for forensic analysis and digital asset management in content moderation contexts
  

Accessibility & Compliance (A11y/WCAG)

• Ensure all interfaces meet WCAG 2.1 Level AA standards as a baseline, with consideration for AAA where appropriate
• Implement semantic HTML, proper ARIA labels, and keyboard navigation patterns
• Build accessible form controls and error handling for verification flows
• Test with screen readers and assistive technologies to ensure inclusive experiences
• Work within UK accessibility regulations and age verification compliance requirements
• Document accessibility patterns and establish team standards for inclusive design

Performance & Conversion Optimisation

• Optimise application performance for users on varied network conditions and devices
• Implement progressive enhancement strategies to maximise conversion whilst maintaining security
• Conduct A/B testing and analyse user behaviour to identify friction points in verification flows
• Optimise Core Web Vitals (LCP, FID, CLS) and loading performance for critical user journeys
• Use analytics data (PostHog) to drive data-informed UX improvements
• Balance security requirements with smooth, frictionless user experiences

Platform and Tooling

• Contribute to our component library built with React 18, 14 App Router, and Tailwind CSS 4+
• Build and maintain isolated, accessible, tested components using Storybook and Chromatic
• Implement our dynamic branding system that adapts themes and layouts via API configuration
• Work with our translation pipeline (Crowdin) to ensure global accessibility
• Collaborate with the existing frontend developer to establish patterns and best practices

Our Tech Stack

Core Framework

• React 18 with 14 (App Router, file-based routing)
• TypeScript for type safety
• 22+ LTS

Styling & Components

• Tailwind CSS 4+ with token-based theme customization
• Storybook + Chromatic for component-driven development and visual regression testing
• Dynamic branding system (theme and layout configuration via API)

Testing & Quality

• Jest + React Testing Library for unit and integration tests
• SonarQube for static analysis and quality gates
• Chromatic for visual testing

DevOps & Tooling

• Pnpm for package management
• Bitbucket + Jenkins CI/CD pipeline
• Crowdin for internationalisation (manual sync with key-based strategy)

Analytics & Monitoring

• PostHog for product analytics, feature flags, and user behaviour tracking (configurable per environment)
• Performance monitoring and conversion funnel analysis

What We're Looking For

Essential Experience

• 3-5 years of professional frontend development experience
• Strong proficiency in React and modern JavaScript/TypeScript
• Experience with or similar SSR/SSG frameworks
• Solid understanding of responsive design and CSS (Tailwind CSS experience is a plus)
• Demonstrated experience building accessible interfaces (WCAG 2.1 compliance)
• Experience writing tests and maintaining quality standards
• Comfortable working with REST APIs and handling asynchronous operations
• Understanding of web security best practices and sensitive data handling
• Experience with web performance optimisation and Core Web Vitals

Nice to Have

• Deep accessibility expertise including screen reader testing, ARIA patterns, and WCAG 2.1 Level AA/AAA compliance
• Experience in highly regulated industries (fintech, healthcare, identity verification)
• Experience with conversion rate optimisation, A/B testing, and analytics-driven UX improvements
• Experience building content moderation tools or trust and safety interfaces
• Familiarity with component libraries and design systems
• Understanding of privacy regulations
• Experience with Storybook, Chromatic, or similar component development tools
• Background in biometric systems, identity verification, or age assurance technologies
• Internationalisation (i18n) experience and working with translation workflows

Working Style

• Strong communication skills and ability to collaborate with Product, Design, Backend teams, and your frontend colleague
• Comfortable being the second frontend specialist, contributing to patterns, standards, and team growth
• Attention to detail, especially around security, privacy, accessibility, and compliance requirements
• Data-driven approach to decision making and comfortable using analytics to inform UX improvements
• Self-directed with good judgement about when to seek input versus push forward independently
• Pragmatic problem solver who balances ideal solutions with business constraints
• Enthusiasm for accessibility and inclusive design as core values, not afterthoughts