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Fullstack Developer

Job Type
Contract/Temporary
Location
London
Salary
Negotiable
Job Ref
BBBH169206_1767975448
Date Added
January 9th, 2026
Consultant
scott palmer
6 month contract - Inside IR35 - Investment Banking, London
FO I.T. Client and Sales facing is an I.T. group providing applications to the Investment Bank Global Market Front Office for e-commerce of both EQD and fixed income products. It comprises approximately 200 people across London, Paris, New York and Mumbai. Amongst other things, this group is responsible for the development of the award-winning Cortex FX application and for electronic connectivity to customers and exchanges throughout the world.
Within this department there are multiple roles developing internally and externally facing applications for pricing and trading cash and structure products across the different product lines through the Smart Derivatives and Cortex brands. The applications are delivered via HTML5 UI technologies and a mix of .NET and Java server side components to manage downstream service interactions and orchestration from pricing through to booking. The projects are undergoing some transformation both with UI platform convergence with like applications but also modularization and industrialization of services to provide a scalable, robust platform for upcoming years of growth.
To further enhance Cortex FX and associated platforms we are seeking to appoint a talented developer with proven experience in .NET and HTML5/Javascript application development and preferably with FX product experience to help complete platform migrations and then to extend capabilities and interoperability with other applications as required.
Key Responsibilities
· Participate in an Agile based software development life-cycle including technical analysis, documentation, development, testing and code reviews.
· Collaborate with the production support team for release and maintenance of the components.
· Work closely with the other developers in determining and following best development and architecture practice.
· Propose and provide feedback from experience/knowledge on architecture, design, technology choices and technology direction of the platform.
· Train and mentor less experienced participants through instruction, pair programming and code review.
· Fully participate in requirement and design meetings for new functionality.
· Develop reference implementations and documentation for platform features
· Moderate and review development contributions from the development community
Skills and Experience
· At least 5 years software development experience in an enterprise environment
· Strong development skills and experience with .NET
· Strong development skills and experience with Javascript/Typescript and HTML5.
· Good development skills and experience with common JS libraries and other web technologies e.g. Angular, Web Components.
· Good development skills and experience with CSS.
· Excellent knowledge of programming best practices, design patterns etc.
· Strong interest in continuous improvement and all aspects of software development and delivery
· Agile practitioner using Scrum.
· Strong understanding of test driven development and continuous integration practices
· Strong communication skills, both orally and in writing, inside and outside the team.
· Desire to learn quickly and ability to adapt to a fast changing environment.
· Strong problem solving skills.
Desirable Requirements
· Experience with common .NET patterns and libraries (i.e. Reactive Extensions (RX), Unity, NUnit)
· Experience developing large, real-time financial trading applications.
· Experience with real time messaging protocols.
· Front office development experience in any of : Interest Rates products, FX, FX Options
· Financial product knowledge in Interest Rates products, FX, FX Options
· An ability to design performant software and an understanding of application performance profiling.

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

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