Front Office C# Senior Developer - VP

Role: Front Office C# Senior Developer - VP

Location: London

Contract: 6 Months (PAYE)

You will be joining an exciting team on a new project to deliver several new global services used directly by the business.These will be used by over ~380 users and represent a key part of our strategy.This strategy is to transform our area delivering new services with next generation technology and modern practices.

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.

Technical & System Performance Calibration

C# Mastery (threading, memory management, and concurrency)

High-Availability (active-active, hot-hot, zero-downtime distributed systems)

Messaging experience (Solace or similar like Kafka/RabbitMQ)

Backend focus with UI-awareness for BFF interaction

Must Have

C#

Real time data/streaming

API design experience

Server side development experience (threading, memory management, performance)

Desirable

K8S

AI/LLM experience (e.g. Claude, Codex, Agents and Agentic flow)

Modernization & Domain Expertise

Legacy code analysis (ability to dissect existing C++ systems)

Financial domain knowledge (Fixed Income, bond curves, capital markets)

Evaluating Ownership Mindset (No BA, No QA)

Direct business engagement and requirement gathering

Full ownership of testing (TDD, automated integration, benchmarking)

Production support and L3 rotation engagement

Culture & Distributed Team Dynamics

Rigorous code reviews and craftsmanship (avoiding AI slop)

Collaboration across distributed teams (14 people, 4 cities)

Sub-projects & Responsibilities

Permissions management

Controls for marking and spreading

Delegation of controls/group management

Providing different levels of control from instrument level, book, sector

Administration functions, auditability, and security of prime concern

Pricing Service (Backend For Frontend)

Support Bond Curve configuration screens (add constituents to the bond curves)

Multitude of functions to support UI interaction for pricing

Pricing blotter support

Adapt messages to proprietary Pricing Engine format sent and received over Solace

API design to be flexible – reuse where possible for curve construction for Rates, FX, and other problem domains

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.