Lead UI Developer – Single Dealer Platform (TypeScript / RxJS / React)

United States Digital Space LLC; Bromley; On-site; GBP 90,000 - 130,000; Full time

Benefits offered by this job

Private healthcare

Pension plan

Health screening

Paid parental leave

Flexible benefits

Job summary

The company in Bromley is seeking a hands-on Lead UI Developer to own the Single Dealer Platform front-end. You will manage the React/TypeScript codebase, apply RxJS reactive patterns, and build low-latency UI features for real-time market data and trading workflows.

Collaborating with product, UX, and server teams, you will drive architecture, performance, and accessibility, delivering resilient, secure interfaces for sales, trading, and institutional clients.

Qualifications

• 3+ years in a senior/lead UI role.
• Strong experience with TypeScript and React in production.
• Experience with high-performance bidirectional data streaming (WebSockets/SSE).
• Proven ability to design modular, testable front-end architectures.

Responsibilities

• Lead the UI roadmap, architecture choices, coding standards, and code reviews.
• Partner with product and UX to translate requirements into delivery plans.
• Own the front-end architecture (React + TypeScript + RxJS) and data-flow design.
• Design reusable components and design system primitives with accessibility in mind.
• Drive performance: virtualization, memoization, and React features.
• Champion resilience: offline fallbacks, retry/backoff, and circuit breakers at UI edge.
• Enforce automated testing and CI/CD with quality gates.
• Instrument analytics and front-end observability.
• Ensure secure front-end practices (XSS, CSP, OAuth/JWT).

Skills

TypeScript

React

RxJS

WebSockets

Server-Sent Events

Real-time UIs

Performance optimization

Tools

Jest

Playwright

CI/CD

Job description

Job Description

Job Title: Lead UI Developer – Single Dealer Platform (TypeScript / RxJS / React)

Corporate Title

Up to VP

Location

Bromley

Company Overview

At the company, we are guided by a common purpose to help make financial lives better through the power of every connection. We do this by driving Responsible Growth and delivering for our clients, teammates, communities and shareholders every day.

Being a Great Place to Work is core to how we drive Responsible Growth. This includes our commitment to being an inclusive workplace, attracting and developing exceptional talent, supporting our teammates’ physical, emotional, and financial wellness, recognizing and rewarding performance, and how we make an impact in the communities we serve.

the company is committed to an in-office culture with specific requirements for office-based attendance and which allows for an appropriate level of flexibility for our teammates and businesses based on role-specific considerations.

At the company, you can build a successful career with opportunities to learn, grow, and make an impact. Join us!

Location Overview

Join our bustling Bromley office, situated in one of London’s greenest boroughs. Here you’ll find plentiful and easy commuting routes, with central London just 15 minutes away by train.

The Team

You will be joining a highly collaborative, cross-functional team responsible for delivering a world-class Single Dealer Platform used by Sales, Trading, and institutional clients globally. The team works closely with product, UX, quantitative, pricing, execution, and infrastructure teams to build low-latency, real-time trading applications that power critical front-office workflows

Role Description

We’re looking for a hands on Lead UI Developer to drive the front end architecture, delivery, and quality of our Single Dealer Platform used by Sales/Trading and institutional clients. You’ll own the React/TypeScript codebase, bring reactive programming best practices (RxJS), and build low latency, event driven UI features for real time market data, pricing, RFQ, order entry, and trade capture. You will collaborate closely with product, UX, and server side teams (pricing/MD feeds, execution, and risk) to ship performant, resilient, and accessible interfaces

Responsibilities

• Lead the UI roadmap, architecture decisions, coding standards, and code reviews for the SDP.


• Partner with product owners and UX to shape requirements into pragmatic, iterative delivery plans.


• Own the front end architecture (React + TypeScript + RxJS), including state management, observables, and data flow design for live market data (WebSockets/Server Sent Events).


• Design and implement modular, testable, and reusable components and design system primitives aligned to accessibility (WCAG 2.1 AA+).


• Drive performance engineering: rendering optimization, virtualization for large grids/blotters, memoization, Suspense/Concurrent features, and profiling.


• Champion resilience: graceful degradation, offline/slow network fallbacks, retry/backoff for streaming and REST, circuit breaker patterns at the UI edge.


• Enforce automated testing (unit, integration, and UI E2E) and CI/CD with quality gates.


• Instrument analytics, logging, and front end observability (e.g., Web Vitals, error tracking).


• Ensure secure front end practices (XSS/CSRF protection, content security policy, secrets handling, auth flows with OAuth/OIDC/JWT).

What we are looking for

• Solid years building web applications with TypeScript and React; 3+ years in a senior/lead role.


• WebSockets, Server-Sent Events, WebRTC or other high performance bidirectional data streaming experience.


• GraphQL, Protobuf, Flatbuffers or other schema-driven API design tools.


• Strong RxJS (or equivalent observables experience) and reactive architecture in production systems.


• Proven experience with real time UIs (market data streams, pricing, RFQ/execution, dashboards) and low latency rendering.


• Deep knowledge of state management (RxJS, or React Query + custom streams) and data flow patterns for streaming + request/response.


• Testing: Jest/Vitest, React Testing Library, Playwright; strong mock/contract testing.


• Security: XSS mitigation, CSP, auth flows (OAuth), secure storage, anti phishing UX.


• CI/CD and feature flagged rollout in regulated environments.


• Excellent communication; ability to drive consensus across engineering, product, and trading desks.

What You’ll Build (Examples)

• Streaming price tiles with RFQ/quote negotiation, inline hedging hints, and instantaneous trade tickets.


• Blotters & position views capable of handling 100k+ rows with virtualization and multi column filters.


• Risk & PnL dashboards with real time recalculation indicators and snapshot comparisons.


• Workflow panels for allocations, confirmations, and exception handling with audit friendly UX.

Skills that will help

• Capital markets domain: FX, Rates, Credit, Equities, Commodities—pricing conventions, market conventions, RFQ lifecycle, OMS/EMS, STP.


• Micro frontends (Module Federation, single-spa) and shared design systems across multiple pods.


• Data heavy UIs: grid ecosystems (AG Grid), complex filtering, pinning, pivoting.


• Publishing and maintaining NPM packages.

Benefits of working at the company

UK

• At the company, we strive to prioritise employees’ health and wellbeing – it’s what makes us a Great Place to Work.


• Private healthcare for you and your family plus an annual health screen to help you manage your physical wellness with the option to purchase a screen for your partner.


• Competitive pension plan, life assurance and group income protection cover if you become unable to work as a result of a disability or health reasons.


• We offer 26-weeks paid maternity leave, 16-weeks paid paternity leave and inclusive family leave arrangements for working parents and carers including 20 days of back-up childcare including access to school holiday clubs and 20 days of back-up adult care per annum.


• 20 days of back-up childcare including access to school holiday clubs and 20 days of back-up adult care per annum.


• The ability to change your core benefits as well as the option of selecting a variety of flexible benefits to suit your personal circumstances including access to a wellbeing account, travel insurance, critical illness, cycle to work etc.


• Access to free counselling through the Employee Assistance Program and virtual GP services through our private health care plan.


• Access to an Employee Assistance Program for confidential support and help for everyday matters.


• Ability to donate to charities of your choice directly through payroll and the bank will match your contribution.


• Opportunity to access our Arts & Culture corporate membership program and receive discounted entry to some of the UK’s most iconic cultural institutions and exhibitions.


• Opportunity to give back to your community, develop new skills and work with new groups of people by volunteering in your local community.

the company

Good conduct and sound judgment is crucial to our long term success. It’s important that all employees in the organisation understand the expected standards of conduct and how we manage conduct risk. Individual accountability and an ownership mind-set are the cornerstones of our Code of Conduct and are at the heart of managing risk well.

We are an equal opportunities employer and ensure that no applicant is subject to less favourable treatment on the grounds of sex, gender identity or gender reassignment, marital or civil partner status, race, religion or belief, colour, nationality, ethnic or national origins, age, sexual orientation, pregnancy or maternity, socio-economic background, responsibility for dependants or physical or mental disability. The Bank selects candidates for interview based on their skills, qualifications and experience.

We strive to ensure that our recruitment processes are accessible for all candidates and encourage any candidates to tell us about any adjustment requirements.