Halian | Managed Services, Recruitment Agency & Contract Staffing
Senior Frontend Developer
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Senior Front End Engineer (React / TypeScript)
London
Hybrid (2-3 days per week)
Build the platform that powers client onboarding at scale
We're looking for a Senior Front End Engineer to help shape and build a modern onboarding and account management platform used by businesses across multiple customer types, including corporates, funds, intermediaries, and complex account structures.
You'll join a highly autonomous engineering team responsible for creating exceptional user experiences within a sophisticated, form-driven application. This is a role for someone who enjoys solving complex frontend challenges, influencing architecture, and taking ownership from design through to production.
We're looking for engineers who care deeply about customer outcomes, software quality, and building the right solutions, not just shipping features.
The Opportunity
- You'll be working on a modern React-based single-page application, building complex onboarding journeys, integrating with external services, and helping define the future direction of the platform's frontend architecture.
- You'll have the freedom to make technical decisions, contribute to architectural discussions, and work in an environment where engineers are trusted to own what they build.
What You'll Be Doing
- Design and develop new features within a modern React single-page application.
- Build and maintain complex user journeys involving multi-step workflows and advanced form validation.
- Take ownership of functionality from concept through to production.
- Define and influence frontend architecture, documenting and presenting technical decisions.
- Ensure security, reliability, and observability are considered from the outset.
- Build highly accessible, responsive, and user-friendly interfaces.
- Integrate with third-party platforms including identity verification, document management, and API services.
- Use AI-assisted development tools effectively and responsibly.
- Review code, mentor team members, and contribute to engineering best practices.
- Collaborate closely with product, design, and engineering teams to deliver outstanding user experiences.
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What We're Looking For
Essential Experience
- Strong commercial experience building and maintaining production-scale applications with React and TypeScript.
- Deep understanding of modern frontend architecture and state management.
- Experience building complex, form-driven applications with sophisticated validation and business rules.
- Strong knowledge of multi-step workflows, state persistence, and long-running user journeys.
- Expertise in server-state management, including caching, invalidation, and data-fetching strategies.
- Experience integrating third-party services and APIs.
- Strong understanding of authentication, authorization, roles, and permissions.
- Solid testing practices with experience using modern frontend testing frameworks.
- Strong accessibility knowledge with experience building applications to WCAG 2.1 AA standards.
- Experience working with component-based design systems and reusable UI libraries.
- Practical experience using AI development tools within software delivery teams.
- Excellent communication skills and the confidence to challenge ideas while remaining collaborative and outcome-focused.
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Technical Skills
- React 18
- TypeScript (Strict Mode)
- TanStack Query, Form, and Router
- Tailwind CSS
- Radix UI / shadcn
- Vitest
- React Testing Library
- Mock Service Worker (MSW)
Nice to Have
While not essential, experience in any of the following would be highly beneficial:
- Auth0 or similar identity providers
- Sentry or comparable monitoring and error-tracking platforms
- Azure Static Web Apps
- Azure DevOps
- CI/CD pipelines
- Vite performance optimization and bundle analysis
- Storybook or other component documentation platforms
- WebSockets or SignalR
- Client onboarding platforms
- KYC/KYB workflows
- Regulated financial services environments
If you don't have industry-specific experience but are an exceptional engineer, we'd still love to hear from you.
Technology Environment
- React 18
- TypeScript (Strict Mode)
- Vite
- Azure Static Web Apps
- Azure DevOps
- Grafana
- Application Insights
- AI-assisted development tools
- Storybook
- MacBook Pro workstation
Why Join?
- End-to-end ownership of the software you build.
- Influence technical direction and architectural decisions.
- Work on genuinely complex frontend engineering challenges.
- Modern technology stack and engineering practices.
- Highly autonomous teams with rapid decision-making.
- Strong culture of quality, collaboration, and continuous improvement.
- Opportunity to work alongside talented engineers solving real-world problems at scale.
If you're passionate about building high-quality React applications, enjoy solving complex user experience challenges, and want the freedom to shape both product and architecture, we'd love to hear from you.
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