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About the Role

This role sits in the Accounts tribe, which owns the onboarding of clients and their accounts, including KYC/KYB across corporate, fund, intermediaries and sub-accounts. You will be part of a team building a single page application that runs on React 18, TypeScript (strict), TanStack Query / Form / Router, Tailwind + a Radix/shadcn component system, Vitest + RTL + MSW. You make the design calls on your domain and argue them out with the tribe. You build it, you run it, you own it. We are after someone who owns customer outcomes, takes responsibility to ensure their software works and sounds the alarm if we are attempting to build the wrong things.

Responsibilities

Design and build new features in a form-heavy, React single page application
Thoroughly test everything you build to prove your software works
Make architectural calls on your domain, record down, present and defend them in front of the tribe.
Build in security, reliability and observability from the start.
Use AI tooling well. We use Claude Code daily and we expect judgement about where it earns its place and where it doesn't.
Review code, raise the standard around you, and help less experienced engineers get better.

Requirements

A strong track record of building modern single-page applications in React and TypeScript, running in production with real users.
Complex form engineering. Four onboarding cohorts, branching validation and cross-field dependencies.
Multi-step flow state. Long journeys that a client leaves and returns to. You must reason about where the state lives and what happens on a reload.
Server-state architecture. TanStack Query at depth: query-key design, cache invalidation, stale policies and prefetch through route loaders.
Third-party integration. Identity verification, document upload and OpenAPI-generated API clients.
Roles and permissions. Enforced in the interface as well as the API.
Testing as a habit. Vitest, React Testing Library and MSW, against a coverage gate that fails the build. You can say what a piece of code is actually protected against.
Accessibility to WCAG 2.1 AA, in Tailwind with a Radix/shadcn component system and a Storybook library.
Real experience building software with AI, not just an interest in it. We want someone with a feel for when it helps and when it is quietly making a mess.
Clear communication with engineers and non-engineers, including the willingness to disagree, and to commit once the call is made.
You must be eligible to work in the UK to be considered for this position.

Skills

React
TypeScript
TanStack Query
TanStack Form
TanStack Router
Tailwind
Radix
shadcn
Vitest
React Testing Library
MSW
AI tooling
WCAG 2.1 AA
Storybook
Auth0
Sentry
Azure Static Web Apps
Azure DevOps
Vite
WebSockets
SignalR

Location

London

Work Type

Permanent
Full Time

Experience Level

Senior

Benefits

25 days’ annual leave, plus bank holidays
An extra day off for your birthday
Holiday loyalty scheme rewarding long-term service
Work abroad scheme for added flexibility
Competitive pension scheme via salary exchange
Annual discretionary bonus scheme (eligible after probation)
Financial education, planning & coaching platform
Interest-free Season Ticket Loan for London travel
Salary exchange nursery fee scheme
Life Insurance
Healthcare platform including: Cashback on dental, optical & physio, Virtual GP access, Mental health and stress support helplines, Additional wellbeing resources
Enhanced parental leave
Cycle to work scheme
Flexible benefits that support everyday life
Career development and progression tools
Opportunities to grow within a fast-scaling international business
Social events

About the Company

Our Development Environment: React 18, TypeScript in strict mode and Vite, deployed to Azure Static Web Apps. The business logic sits behind APIs, so the front end owns orchestration, state and complex forms. Azure DevOps for planning and CI/CD. Grafana and Application Insights for observability. Claude Code in daily use. Autonomous teams, short paths between a decision and it being live. A macbook pro for your workstation.

Equal Opportunity

We believe that diversity and inclusion are essential to our success. We are committed to fostering a culture where everyone feels valued and respected, regardless of their background, identity or experiences. By embracing diverse perspectives and promoting equity, we aim to create an environment where all employees can perform and reach their full potential.