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# Cortex FX Full Stack Developer - Lorien

- **Company:** Vertage Group
- **Location:** London, United Kingdom
- **Experience:** Expert
- **Contract:** Temporary to permanent
- **Skills:** Java (Programming Language), JavaScript (Programming Language), .NET Framework, Agile Methodology, Algorithmic Trading, Application Performance Management, ARM Architecture, HTML5, Automation of Tests, C Sharp (Programming Language), Cascading Style Sheets (CSS), Profiling, Code Review, Continuous Integration, Software Design Patterns, Software Construction, Software Engineering, Software Systems, Data Streaming, TypeScript, Web Applications, RxJS, Test-Driven Development (TDD), Backend, AngularJS, Low Latency, Reactive Programming, Front End Software Development
- **Published:** October 27, 2026
- **Apply:** https://www.reed.co.uk/jobs/cortex-fx-full-stack-developer-lorien/57494463

## About the Role

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., * 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.

## Description

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