Market Pre Trade C# Developer (Contract)

Role: Market Pre Trade C# Developer (Contract)

Location: London

Contract duration: 6 Months initial term (with further extension potential)

Rate: Competitive

Join a high-performing Markets Pre-Trade technology team delivering next-generation services used globally by Front Office users. You will work on strategic platforms that support over 380 users across the firm and play a key role in modernising critical pre-trade systems.

We are replacing older C++ services - whose function and requirements have changed compared to today. As part of this work, analysis of the existing system and requirement discovery will be needed. This is a great opportunity to deliver improvements for the firm. All of these sub-projects offer great exposure to linear products and working with the business.

Instrument Management

• Integration with enterprise data sources

• Support for pre-issuance, corrections, and overrides

• Direct integration with trading and pricing workflows

Pricing Services

• APIs and backend services supporting pricing applications

• Configuration and workflow tooling for traders

• Integration with pricing engines and market data systems

• Reusable services that can be leveraged across asset classes

This is a hands-on engineering role requiring developers who can take ownership from analysis through to production support. You should be comfortable:

• Working directly with business users

• Gathering and refining requirements

• Delivering high-quality, well-tested code

• Participating in code reviews

• Supporting production systems when required

• Demonstrating and iterating solutions frequently

You will work in the following environment;

• GitLab-based development and CI/CD pipelines

• Agile delivery with close Front Office engagement

• No dedicated QA or BA function, we deliver end-to-end

• Focus on quality, observability, scalability, and resilience

You will work with;

• Developers across London, New York, Tokyo

• Close collaboration between UI and backend teams

• High-profile programme with strong business sponsorship

• Long-term roadmap with multiple strategic deliverables

What we are looking for in required skills;

• Strong C# development experience

• Real-time data and event-driven systems

• API design and backend service development

• Performance optimisation, threading, and memory management

• Experience building scalable, highly available systems

What we would like to see from you;

• Kubernetes (K8S)

• AI / LLM tooling (Claude, Codex, Agents)

• Angular or React

• TypeScript / JavaScript

• AG Grid

• WebSocket / WebTransport

• gRPC/Protobuf

• Solace messaging

• Modern Visual Studio / VS Code workflows

• C++

This is an opportunity to shape the future architecture of the Pre-Trade technology stack while gaining strong exposure to Fixed Income and broader Markets business functions and we replace several legacy C++ services with modern, scalable platforms.

About Barclays

Barclays is a British universal bank. It is diversified by business, by different types of customers and clients, and by geography. Barclays businesses include consumer banking and payments operations around the world, as well as a top-tier, full service, global corporate and investment bank, all of which are supported by its service company which provides technology, operations and functional services across the Group.

Values

Everything Barclays does is shaped by its five values of Respect, Integrity, Service, Excellence and Stewardship. The Barclays values inform the foundations of its relationships with customers and clients, but they also shape how Barclays measures and rewards the performance of colleagues. Simply put, success is not just about what you achieve, but about how you achieve it.

Diversity

Barclays aims to foster a culture where individuals of all backgrounds feel confident in bringing their whole selves to work, feel included and their talents are nurtured, empowering them to contribute fully to Barclays vision and goals.

Hybrid Working

Barclays is currently in the early stages of implementing a hybrid working environment, which means that many colleagues spend part of their working hours at home and part in the office, depending on the nature of the role they are in. Barclays is flexible on how this works and it may continue to change and evolve. Depending on your team, typically this means that colleagues spend a minimum of between 20% to 60% of their time in the office, which could be over a week, a month or a quarter. However, some colleagues may choose to spend more time in the office over a typical period than their role type requires. Barclays also has a flexible working process where, subject to business needs, all colleagues globally are able to request work patterns to reflect their personal circumstances

Your Benefits

As a contract employee of Randstad Sourceright, you’ll receive a wide range of financial and personal benefits. There’s enrolment in a pension plan (after 12 weeks on assignment) and holiday pay. You’ll also get 24/7 access to an Employee Assistance Programme, designed to help you deal with any problems that could be affecting your home or work life. Plus, there’s discounts at heaps of high street shops, restaurants and entertainment - from Asda to Zizzi Italian restaurants.