C# / .NET Developer – Front Office, FX & Orchestrade Systems in London

Join MARGO in the UK (London)

MARGO is a tech-native consultancy delivering high value-added IT expertise to the financial services industry.

We specialise in complex software engineering environments where performance, robustness, and scalability are critical: real-time systems, low-latency architectures, and high-throughput data processing.

Joining MARGO means working in demanding

Front Office and Trading IT environments while benefiting from a human-sized structure, close follow-up, and tailor-made training paths.

• Business Context
• You will join the

FX Risk IT environment of a leading tier-1 investment bank. The team is responsible for designing and maintaining mission-critical systems supporting

• FX Cash
• (Forward, Swap, NDF) and
• FX Derivatives

(Options, Carbon Offsets).

The environment is built around the

Orchestrade vendor platform and involves close collaboration with traders, quants, and risk managers to deliver high-performance trading solutions.

Role Overview

We are looking for a

Senior C# / . NET Developer with a strong technical background to lead the development and integration of FX trading solutions. While expertise in the

Orchestrade platform is highly desirable, we are primarily seeking a high-caliber engineer who can master complex vendor APIs and provide technical leadership within a fast-paced, agile culture.

Key Responsibilities

• Design & Development
• System Evolution: Analyse, design, and develop high-performance C# solutions for FX cash and derivative products.
• Orchestrade Integration: Develop code to integrate Orchestrade with connected internal systems such as Sigma, Barracuda, and Deal Hub.
• Architecture: Advise on the best architectural approaches for integrating vendor products with service-oriented and micro-services concepts.
• Data & Middleware: Design clean interfaces and manage data flow using SQL and messaging middleware.
• Engineering & Mentoring
• Technical Leadership: Provide mentoring and guidance to other developers on C# best practices and FX business logic.
• Delivery Ownership: Take ownership of specific project deliveries, applying agile methodologies and project management skills where required.
• Quality Standards: Drive high engineering standards through continuous integration and Dev Ops practices.
• Production & Support
• Level 3 Support: Provide expert-level support for production Orchestrade systems and connected FX IT platforms.
• System Controls: Ensure all developments comply with internal systems, controls, and regulatory requirements.
• Technical Environment & Skills

Essential Experience

• Expert C# / . NET: Substantial experience in software development with deep knowledge of the . NET ecosystem.
• Investment Banking: Prior experience working in a Front Office environment alongside traders, quants, or risk managers.
• Backend & Middleware: Strong understanding of SQL/RDBMS and messaging middleware.
• Architecture: Solid grasp of service-oriented and micro-services design concepts.
• Valued Technical Exposure (Desirable)
• Orchestrade: Strong experience with Orchestrade features, configurations, and APIs.
• FX Domain: Knowledge of FX Forward, Swap, NDF, and FX Options/Derivatives.
• Cross-Platform: Experience with C++, Java, or FIX protocol.
• Other Vendors: Familiarity with Calypso, Murex, or similar trade management products.
• Why Join MARGO
• Tier-1 Exposure: Work at the heart of FX Risk IT for a major global bank.
• Technical Growth: Highly challenging assignments bridging vendor platform expertise and bespoke C# engineering.
• Career Progression: Clear paths for technical leadership and architectural ownership.
• Mentorship Culture: Benefit from and contribute to a high-quality peer-review and mentoring environment.

Please note: We do not offer visa sponsorship for this position.

• Interested? Motivated? Apply on our website or at
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