Job Description

Java Developer - Front Office / Trading Systems

Join MARGO in the UK (London) - Perm & Contracting Opportunity

*

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: low latency systems, real-time data processing, distributed architectures and high-volume flows.
Joining MARGO means working in

demanding Front Office and Risk 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 partners.
The teams design and maintain

mission-critical Java systems

supporting electronic trading activities across multiple asset classes (e.g. Equities, Fixed Income, Commodities, FX, Derivatives).
The environment is characterised by:Real-time and event-driven architectures High performance and low-latency constraints Close interaction with trading, quantitative and risk teams Short delivery cycles and high engineering standards

Role Overview

We are looking for an experienced

Java Developer

to work on

real-time trading and risk systems.

The role is

primarily technical

, focused on software engineering excellence 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 Java applications

Work on

real-time data processing

(market data, pricing, orders, analytics) Implement

multithreading and concurrency patterns

adapted to performance-critical systems Participate in system design, architecture discussions and technical specifications Continuously optimise performance (latency, throughput, memory, GC behaviour)

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 interventions) Contribute to system stability, monitoring and incident prevention

Technical Environment

Core Technologies

Java (expert level)

- Multithreading & concurrency
- Performance optimisation & low latency techniques
- Garbage Collection awareness

Linux / UNIX environments

Distributed systems and messaging architectures

Performance monitoring and profiling tools

Valued Technical Exposure

Event-driven or real-time systems Messaging middleware (Kafka, Solace or equivalent) FIX or other market connectivity protocols Networking fundamentals (TCP/IP, multicast)

Required Experience & Skills

Essential

Strong experience as a

Java Developer

in performance-critical environments Proven background in

low-latency or high-throughput systems

Solid understanding of

concurrency, threading and memory management

Experience working in

Front Office, Trading or Risk IT environments

Comfortable working in

Linux production environments

Clear communication and structured problem-solving skills

Valued (but not restrictive)

Exposure to one or more asset classes (Equities, Fixed Income, Commodities, FX, Derivatives) Experience in trading, pricing, risk or market data systems

Why Join MARGO

Access to

multi-asset Front Office environments

Highly technical and challenging engineering assignments 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]

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.