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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Front End Developer - **Company:** Descrial Descrial - **Location:** London, UK - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** JavaScript (Programming Language), Artificial Intelligence, Amazon Web Services, User Authentication, Cascading Style Sheets (CSS), Software as a Service, Cloud Computing, Continuous Integration, Cross-Site Request Forgery, Cursor, Interaction Design, E2e Testing, Coupa Supplier Portal, SonarQube, TypeScript, Virtualization Technology, Web Content Accessibility Guidelines, ReactJS, Cypress (Programming Language), Cross-Site Scripting (XSS), Git, Information Technology, Playwright, React Native, Front End Software Development, React Testing Library, Jenkins - **Published:** October 1, 2026 - **Apply:** https://www.apply4u.co.uk/jobs/front-end-developer/49620334 ## About the Role perceived performance so model calls taking seconds still feel responsive. The shared platform You contribute to the component library and tenant theming, keeping branding, permissions and configuration clean. You integrate backend APIs with authentication, role-based access, tenant context and useful client-side error handling. The quality bar You maintain unit, integration and end-to-end tests with Jest, React Testing Library and Cypress or Playwright, and meet WCAG 2.1 accessibility standards. You profile and optimise code splitting, lazy loading, memoisation and bundles through Jenkins and SonarQube pipelines to AWS. Your experience * You have 5+ years in front-end engineering with deep React and TypeScript experience. React Native experience is valued. * You have shipped data-dense enterprise interfaces and can explain the grids, dashboards and state decisions behind them. * You understand state management, front-end security including XSS, CSRF and CSP, and testing discipline. * You have built SaaS or multi-tenant products and are familiar with Git, CI/CD and cloud deployment. * You use AI coding tools daily, such as Cursor or Claude Code, and have a considered view of where they help. * You have a degree in engineering, computer science or a related field, or equivalent experience. Useful to have, none required * Interfaces for AI-assisted or agentic products * Micro-frontends, including Module Federation or comparable approaches * Contribution to or ownership of a design system * Financial data visualisation The reality This will be difficult. It demands pace and accuracy. We are building autonomous systems inside high-stakes live businesses, where decisions carry real consequences and impact and waiting for everyone to agree is not always an option. The systems will sometimes get things wrong. In this phase the London team needs to create the evaluations, visibilities and safeguards that catch mistakes early, reducing ## Description made. Thirty of us in King's Cross, small and senior, with day one founder intensity. At its fullest expression, Descrial changes how every serious investment firm decides. The role You report to the Head of Engineering and contribute to a shared component system that can be themed across tenants. Your work combines data-heavy enterprise interfaces with the performance and interaction design that AI-assisted workflows need. Your remit The product surfaces You build advanced forms, analytics dashboards, real-time updates and rich document views in React and React Native with TypeScript. You make dense data usable through grid components such as AG Grid or MUI DataGrid, virtualisation and CSS Grid/Flexbox layouts that hold at scale. The AI experience You implement streaming responses, citations, verification affordances and safe failure states. For agent workflows, you make approvals, hand-offs, tool calls and partial progress visible, and let users interrupt or correct a run. 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