Cortex FX Full Stack Developer

Cortex FX Full Stack Developer Job TypeContract to HireLocationLondonSalaryNegotiableJob RefBBBH189458_1793009218Date AddedOctober 26th, 2026ConsultantNicholas Marshall Senior Full Stack Developer (Front Office Trading)

6-Month Contract London / Hybrid Working Competitive Day Rate

The Opportunity

We are currently seeking an experienced Senior Full Stack Developer to join a high-performing Front Office technology team within a leading global investment banking environment.

You will play a key role in the development and enhancement of mission-critical electronic trading platforms supporting FX and Fixed Income products. Working within a globally distributed Agile team, you'll contribute to the evolution of a next-generation trading ecosystem, delivering scalable, high-performance applications used by traders, sales teams, and clients worldwide.

This is an exciting opportunity for a developer with strong JavaScript/TypeScript and .NET or Java expertise, ideally gained within electronic trading, capital markets, or real-time financial systems.

The Role

As a Senior Developer, you will be involved throughout the full software development lifecycle, contributing to architecture, design, development, testing, and deployment activities.

You'll work on a suite of front-office applications undergoing significant transformation, including platform modernisation, UI convergence, service modularisation, and scalability improvements to support future business growth.

Key Responsibilities

• Design, develop and maintain high-performance front-office trading applications.
• Participate in an Agile software development lifecycle including technical analysis, development, testing, code reviews and documentation.
• Collaborate closely with product owners, business stakeholders, developers and support teams.
• Contribute to architectural discussions and influence technology direction and best practices.
• Develop modern web-based user interfaces using JavaScript, TypeScript and HTML5 technologies.
• Build and maintain backend services using .NET/C# or Java.
• Deliver scalable solutions capable of processing real-time market and trading data.
• Support platform modernisation, integration and migration initiatives.
• Create reference implementations and technical documentation.
• Conduct peer reviews and mentor less experienced developers.
• Work closely with production support teams during releases and ongoing maintenance.
• Drive continuous improvement across development practices, tooling, testing and delivery processes.

Required Skills & Experience

• Extensive software development experience within enterprise environments.
• Strong commercial experience with:
• JavaScript / TypeScript
• HTML5
• CSS
• Angular or similar modern front-end frameworks
• Web Components
• Strong backend development experience with:
• C# / .NET
• OR Java
• Experience working with real-time and streaming data technologies.
• Knowledge of Reactive programming frameworks such as:
• RxJS
• Reactive Extensions
• Strong understanding of software engineering best practices, design patterns and architecture principles.
• Experience working in Agile/Scrum environments.
• Strong understanding of:
• Test-Driven Development (TDD)
• Continuous Integration (CI/CD)
• Automated testing practices
• Excellent communication and stakeholder engagement skills.
• Strong analytical and problem-solving capabilities.

Desirable Experience

• Front Office Investment Banking experience.
• Electronic Trading platform development experience.
• FX, FX Options or Interest Rate product knowledge.
• Experience developing large-scale real-time trading systems.
• Knowledge of real-time messaging and market data technologies.
• Application performance profiling and optimisation expertise.
• Experience designing low-latency, highly performant software solutions.
• Exposure to pricing, execution, trade capture or booking platforms.

Guidant, Carbon60, Lorien & SRG - The Vertage Group Portfolio are acting as an Employment Business in relation to this vacancy.

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