Principal Software Engineer

TP ICAP; Belfast City District; Hybrid; GBP 75,000 - 110,000; Full time

Job summary

TP ICAP in Belfast is seeking a Senior Frontend Engineer to own the React/TypeScript architecture for a high-scale trading platform. You will set patterns, drive quality, and ensure delivery across multiple workstreams.

You will mentor engineers and collaborate with product, architects, and backend teams to shape the roadmap. The role requires strong leadership and a passion for scalable frontend systems.

Qualifications

• Deep React + TypeScript expertise and scalable architecture decisions.
• Strong experience with Redux in data-intensive UIs and performance at scale.
• Experience designing and maintaining monorepo architecture with clear package boundaries.
• Production GraphQL experience — schema design, caching, subscriptions, codegen.
• Testing strategies across unit, integration, and browser layers.
• Frontend observability and performance tooling experience.

Responsibilities

• Own the frontend architecture: define component boundaries, state management patterns, and data-flow contracts.
• Drive technical strategy for the platform — evaluate tools, migrations, and build-vs-buy decisions.
• Set and enforce engineering standards: testing strategy, code quality, observability.
• Design solutions for real-time data rendering at scale and efficient Redux-saga orchestration.
• Lead delivery across multiple workstreams and ensure consistency.
• Mentor Senior Engineers and foster architectural collaboration across teams.
• Collaborate with Product, Architects, and backend teams to shape roadmap priorities.

Skills

React

TypeScript

Redux

Monorepo

GraphQL

Testing

Observability

Mentoring

Communication

Tools

Turborepo

pnpm

Vitest

Playwright

MSW

Apollo Client

OpenTelemetry

Grafana

Job description

Group OverviewThe TP ICAP Group is a world leading provider of market infrastructure.Our purpose is to provide clients with access to global financial and commodities markets, improving price discovery, liquidity, and distribution of data, through responsible and innovative solutions.Through our people and technology, we connect clients to superior liquidity and data solutions.The Group is home to a stable of premium brands. Collectively, TP ICAP is the largest interdealer broker in the world by revenue, the number one Energy & Commodities broker in the world, the world’s leading provider of OTC data, and an award winning all-to-all trading platform.The Group operates from more than 60 offices in 27 countries. We are 5,300 people strong. We work as one to achieve our vision of being the world’s most trusted, innovative, liquidity and data solutions specialist.Role OverviewYou’ll be the technical leader for a real-time trading platform used daily by brokers across Rates & FX desks. The frontend is a large-scale React/TypeScript monorepo — dense data grids, real-time pricing via WebSocket and GraphQL subscriptions, and complex multi-panel layouts. You’ll set the technical direction and make sure the architecture scales as the product grows.You’ll own the frontend architecture end-to-end: defining patterns, driving quality standards, removing technical debt, and enabling your team to ship confidently. You balance long-term technical vision with pragmatic delivery under real market conditions.Role ResponsibilitiesOwn the frontend architecture: define component boundaries, state management patterns, and data-flow contracts across a pnpm/Turborepo monorepoDrive technical strategy for the platform — evaluate new tools, plan migrations, and make build-vs-buy decisions with clear rationaleSet and enforce engineering standards: testing strategy (Vitest, Playwright, MSW), code quality (Biome, Knip, dependency-cruiser), and observability (Grafana Faro, OpenTelemetry)Design solutions for complex problems: real-time data rendering at scale, performant AG Grid configurations, efficient Redux-saga orchestration, and GraphQL subscription managementLead technical delivery across multiple workstreams — unblock teams, resolve cross-cutting concerns, and ensure consistency across packagesMentor and grow Senior Engineers through architecture reviews, pairing on hard problems, and creating space for others to make decisionsCollaborate with Product, Architects, and backend teams (C#/.NET, GraphQL BFF) to shape roadmap priorities and negotiate technical trade-offsExperience / CompetencesEssentialDeep React + TypeScript expertise — you’ve architected large-scale applications and made structural decisions you can defendStrong experience with Redux in complex, data-intensive UIs (sagas, selectors, normalised state, performance at scale)Proven ability to design and maintain monorepo architecture: package boundaries, dependency management, build orchestration with Turborepo/pnpmProduction GraphQL experience (Apollo Client) — schema design collaboration, caching strategies, subscriptions, codegen workflowsExperience defining and implementing testing strategies across unit, integration, and browser layersTrack record of improving developer experience: build performance, linting/formatting automation, CI pipeline optimisationYou’ve led technical migrations or platform upgrades without halting feature deliveryExperience setting up or evolving frontend observability (RUM, tracing, error budgets)Strong communicator who can translate architectural decisions into clear rationale for engineers, product, and leadershipDesiredExperience with real-time data systems (WebSockets, streaming updates, high-frequency UI rendering)Deep AG Grid expertise — custom renderers, virtual scrolling, enterprise modules at scaleExposure to financial/trading platforms or latency-sensitive environmentsExperience with Module Federation or micro-frontend architecturesFamiliarity with feature flag systems (Unleash) and progressive rollout strategiesBackend awareness (C#/.NET, GraphQL resolvers, relational databases) sufficient tocollaborate on API designRole Band & LevelManager, 7#LI-Hybrid #LI-MID #NIJobsNot The Perfect Fit?Concerned that you may not meet the criteria precisely? At TP ICAP, we wholeheartedly believe in fostering inclusivity and cultivating a work environment where everyone can flourish, regardless of your personal or professional background. If you are enthusiastic about this role but find that your experience doesn't align perfectly with every aspect of the job description, we strongly encourage you to apply. You may be the ideal candidate for this position or another opportunity within our organisation. Our dedicated Talent Acquisition team is here to assist you in recognising how your unique skills and abilities can be a valuable contribution. Don't hesitate to take the leap and explore the possibilities. Your potential is what truly matters to us.Company StatementWe know that the best innovation happens when diverse people with different perspectives and skills work together in an inclusive atmosphere. That's why we're building a culture where everyone plays a part in making people feel welcome, ready and willing to contribute. TP ICAP Accord - our Employee Network - is a central to this. As well as representing specific groups, TP ICAP Accord helps increase awareness, collaboration, shares best practice, and holds our firm to account for driving continuous cultural improvement.LocationUK - City Quays 3 - Belfast