frontend js/react/typescript in fintech

IFX Payments provides financial services focused on client and account onboarding, including KYC/KYB for corporate clients, funds, intermediaries, and sub-accounts.

• Design and build new features in a form-heavy React single-page application;
• Thoroughly test all delivered software;
• Make architectural decisions within the domain, document them, present them, and defend them before the tribe;
• Build security, reliability, and observability into software from the start;
• Use AI tooling with sound judgment about where it adds value;
• Review code, raise engineering standards, and help less experienced engineers improve.

• Strong track record of building modern React and TypeScript single-page applications running in production with real users;
• Experience with complex form engineering, including branching validation and cross-field dependencies;
• Ability to design multi-step flow state for long journeys that clients may leave and resume;
• Deep experience with TanStack Query, including query-key design, cache invalidation, stale policies, and route-loader prefetching;
• Experience integrating identity verification, document upload, and OpenAPI-generated API clients;
• Experience implementing roles and permissions in both the interface and API;
• Habit of testing with Vitest, React Testing Library, and MSW against coverage gates;
• Experience building accessible software to WCAG 2.1 AA standards with Tailwind, Radix/shadcn, and Storybook;
• Real experience building software with AI and judgment about when it helps or creates problems;
• Clear communication with engineers and non-engineers, including willingness to disagree and commit once a decision is made;
• Nice to have: Auth0 or a similar identity provider, Sentry or similar error tracking and observability, Azure Static Web Apps and Azure DevOps or comparable CI/CD, Vite build and bundle work, regulated financial services or KYC/KYB or client onboarding, Storybook or another documented component library, real-time updates over WebSockets or SignalR;
• Must be eligible to work in the UK.

• 25 Days’ annual leave plus bank holidays;
• An extra day off for your birthday;
• Holiday loyalty scheme;
• Work abroad scheme;
• Competitive pension scheme via salary exchange;
• Annual discretionary bonus scheme eligible after probation;
• Financial education, planning, and coaching platform;
• Interest-free Season Ticket Loan for London travel;
• Salary exchange nursery fee scheme;
• Life Insurance;
• Healthcare platform with dental, optical, physiotherapy, virtual GP, and mental health support;
• Enhanced parental leave;
• Cycle to work scheme;
• Flexible benefits;
• Career development and progression tools;
• A MacBook Pro for the workstation;
• Full background checks will be carried out on all successful candidates.