C# / .NET Developer – Front Office, Electronic & Low Latency Trading Systems

C# / .NET Developer – Front Office, Electronic & Low Latency Trading Systems

Join MARGO in the UK (London) – Perm & Contracting Opportunities

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, distributed computing 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 Front Office / Trading IT environment of one of our tier-1 investment banking or trading partners.

The teams design and maintain mission-critical C# / .NET systems supporting electronic trading, real-time risk and analytics platforms across multiple asset classes (Equities, Fixed Income, Commodities, FX, Derivatives).

These systems operate close to trading desks and electronic trading platforms, with strong constraints on performance, reliability and production stability.

Real-time and event-driven architectures

Low-latency and high-throughput processing requirements

Strong production and stability constraints

Close interaction with trading, quantitative and risk teams

High engineering standards and short delivery cycles

Role Overview

We are looking for an experienced C# / .NET Developer to work on real-time, electronic trading and risk systems.

The role is primarily technical and engineering-driven, focused on performance, scalability and robustness rather than business analysis.

Candidates are expected to have prior exposure to Front Office, Trading or Risk environments, regardless of the underlying asset class.

Key Responsibilities

Design & Development

Design, develop and maintain high-performance C# / .NET applications

Work on real-time data processing including market data, pricing, orders, analytics and risk calculations

Implement concurrency and parallel programming patterns adapted to performance-sensitive systems

Participate in system design, architecture discussions and technical specifications

Continuously optimise performance including latency, throughput and memory usage

Engineering & Delivery

Contribute to the full software lifecycle: design, development, testing and release

Produce clean, maintainable and well-tested code

Participate in sprint planning, estimations and technical reviews

Collaborate closely with developers, quant and infrastructure teams

Production & Support

Provide 3rd line support on production systems when required

Participate in production releases including occasional out-of-hours interventionsContribute to system stability, monitoring and incident prevention

Technical Environment

Core Technologies

C# / .NET (expert level)

Concurrency and parallel programming

Asynchronous and multithreaded models

Memory management and performance profiling

Distributed and event-driven architectures

Windows and/or Linux production environments

Performance monitoring and profiling tools

Valued Technical Exposure

Electronic trading or low-latency trading systems

High-throughput or real-time architecturesMessaging middleware (Kafka, Solace or equivalent)

FIX or other market connectivity protocols

RESTful or service-oriented architectures

High Performance Computing (HPC) or grid computing concepts

Required Experience & Skills

Essential

Strong experience as a C# / .NET Developer in performance-sensitive environments

Proven background in real-time or high-throughput systems

Solid understanding of concurrency, parallelism and memory optimisation

Experience working in Front Office, Trading or Risk IT environmentsStrong production mindset and system ownership

Clear communication and structured problem-solving skills

Valued (but not restrictive)

Exposure to electronic trading platforms or low-latency environments

Experience across one or more asset classes (Equities, Fixed Income, Commodities, FX, Derivatives)

Familiarity with distributed, grid or event-driven systems

Interaction with C++ low-latency or HFT-adjacent components

Why Join MARGO

Access to multi-asset Front Office, Trading and Electronic Trading environments

Highly technical and challenging engineering assignments

Clear positioning between HFT and non-HFT trading systems

Strong emphasis on skill development and long-term career progression

Human-sized consultancy with close support and high-quality missions

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

Interested? Motivated? Apply on our website or at [email protected]

#J-18808-Ljbffr