---
title: 'C++ Developer – High Frequency Trading (HFT Systems) at MARGO'
canonical: 'https://feeny.ai/job/c-developer-high-frequency-trading-hft-systems-margo-london-daxv9krnf4c5'
type: 'job'
last_seen: '2026-09-07'
---

# C++ Developer – High Frequency Trading (HFT Systems) at MARGO

- **Company:** MARGO
- **Location:** London, United Kingdom
- **Employment:** contract
- **Work type:** hybrid
- **Posted:** 2026-01-12
- **Last confirmed live:** 2026-09-07
- **Apply:** https://jobs.lever.co/margo-group/f93cf28e-4336-4ab3-8e75-d2efdea3718b

## Job description

C++ Developer – High Frequency Trading (HFT Systems)

Join MARGO in the UK (London) – High Performance Trading Environments

MARGO is a tech-native consultancy delivering elite software engineering expertise to the most demanding financial markets environments. We operate in latency-critical trading contexts where performance, determinism and predictability are core system requirements. Our consultants work in highly specialised trading environments, designing systems that interact directly with exchanges and market venues under extreme time constraints.

Business Context

You will join a High Frequency Trading / Low Latency Trading environment within one of our partners (investment banks, proprietary trading firms or market makers). The teams design, build and operate latency-sensitive trading systems directly connected to exchanges, typically deployed in colocated environments. These systems are characterised by:

- Microsecond to sub-microsecond latency constraints
- Deterministic and predictable execution paths
- Minimal software and network overhead
- Direct interaction with market data feeds and order gateways

## Role Overview

We are looking for a C++ Software Engineer to work on latency-critical trading infrastructure. The role is strongly engineering-driven and focuses on speed, predictability and control of execution rather than functional feature delivery. Depending on the environment, the role may also involve interaction with C# components used outside the ultra-latency-critical execution path.

## Key Responsibilities

Core HFT Engineering

- Design, develop and optimise ultra-low latency C++ trading components
- Work on critical execution paths for market data processing and order routing
- Implement lock-free and wait-free algorithms
- Optimise memory allocation, cache locality and CPU utilisation
- Reduce jitter and tail latency

System-Level & Hardware-Aware Optimisation

- Analyse and optimise CPU behaviour (branch prediction, cache misses, NUMA effects)
- Work closely with infrastructure and network teams on kernel bypass and user-space networking
- Profile systems at instruction-level and hardware-counter granularity

Production Ownership

- Ensure correctness, determinism and stability of production trading systems
- Participate in production releases and live deployments
- Investigate latency regressions and production anomalies
- Maintain rigorous operational discipline

Use of C# (Non-Critical Path) C# may be used outside the latency-critical execution path for:

- Monitoring and control tooling
- Configuration and orchestration services
- Risk guards, limits and kill-switch mechanisms
- Real-time dashboards and operational analytics

C# is not used on the execution path and does not replace core C++ expertise.

Technical Environment

Core Technologies

- Modern C++ (C++17/20)
- Lock-free programming
- Custom memory allocators
- Zero-copy architectures
- Linux (advanced / low-level understanding)
- CPU pinning
- Huge pages
- NUMA architectures
- Networking
- TCP / UDP market data feeds
- Multicast
- Kernel bypass technologies (DPDK, Solarflare Onload or equivalent)

Latency & Performance Tooling

- CPU profilers and hardware performance counters
- Packet capture and latency measurement tools
- Exchange simulators and market data replay tools

Required Experience & Skills

Essential

- Strong experience in C++ development for performance-critical or low-latency systems
- Proven background in HFT or ultra-low latency trading environments
- Deep understanding of CPU architecture, caches and memory models
- Strong knowledge of concurrency, memory ordering and Linux internals
- Experience working close to hardware and network layers
- Strong production mindset and sense of ownership

Highly Valued

- Exposure to C# in trading, control or monitoring systems
- Experience with market data feed handlers or order gateways
- Prior exposure to market making or proprietary trading environments
- Experience with FPGA-assisted or hybrid architectures

## Why Join MARGO

- Access to elite HFT and ultra-low latency trading environments
- Technically extreme and intellectually demanding engineering assignments
- Clear separation between execution-critical and supporting systems
- Human-sized consultancy with very high technical standards
- Long-term positioning on rare, high-value low-latency engineering skillsets

Important Note This role is not suitable for candidates with a C#-only background. Core execution systems are implemented in C++.

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

Interested? Motivated? Apply on our website or at staff.uk@margo.com

## About MARGO

## Company Overview
- **One-liner**: MARGO is an international technology engineering and AI consulting group that transforms technological complexity into business performance for global leaders in finance, insurance, energy, manufacturing, and tech.
- **Entity Type**: Private (100% organically grown, no external funding disclosed)
- **Headquarters**: Paris, France (with offices in London and Warsaw)
- **Founded**: 2005
- **Founders**: Olivier Hemar and Xavier Lagarrigue

## Core Business
- **Primary industries**: Data, Cloud, and AI consulting; IT engineering services
- **Target customers**: B2B – large enterprises and global leaders in Finance, Insurance, Energy, Manufacturing, and Technology
- **Mission/purpose**: To solve highly complex IT challenges by combining engineering excellence with world-class partner solutions, transforming technological complexity into business performance and competitive advantage.

## Products & Services
- **Data, Cloud & AI Architecture Consulting**: Design and deployment of critical data, cloud, and AI architectures for high-stakes environments. Service type: Consulting & Engineering Services.
- **Hyper-specialized IT Consulting**: Focus on highly complex IT projects where the complexity of the mission correlates with its value. Service type: Consulting.

## Market Standing
- **Valuation/Market Cap**: Not publicly available (private company)
- **Key Metric**: €45M turnover in 2025 (annual revenue)
- **Notable Investors/Partners**: No external investors cited; company is 100% organically grown. Partners include global technology leaders (e.g., cloud and data platform providers).
- **Growth Signals**: 19+ consecutive years of growth; expanded from Paris to London and Warsaw with a team of 450; 34% of consultants from Tier 1 universities; certified Great Place to Work (Top 30 in France).

## Competitive Advantages
- **Hyper-specialization**: Focuses exclusively on highly complex IT projects, avoiding volume-driven commodity consulting.
- **Elite talent pool**: 34% of consultants from top-tier engineering schools (Polytechnique, CentraleSupélec, Télécom Paris, ENSIMAG) – 15% above market average.
- **Strong culture of excellence**: Peer-led EXCELLENCE Hub delivers 726 coaching sessions/year, 35 Learning Expeditions, one certified training per employee per year.
- **100% organic growth** since 2005, demonstrating a resilient and independent business model.

## Strategic Focus
- Continue organic growth by deepening relationships with key accounts in finance, insurance, and industry.
- Invest in the EXCELLENCE Hub to further develop technical skills and personal branding (e.g., speaking at Devoxx, ACCU, CppCon).
- Expand the hybrid work model that balances in-person collaboration (headquarters in La Défense, Paris) with remote flexibility.
- Maintain a selective project portfolio – prioritize quality and intellectual challenge over volume.

## Why Work Here
- **Culture**: Emphasizes excellence, exemplarity, and ambition. Peer-led acceleration with continuous learning (Learning Lunches, meetups, certifications). Encourages personal branding and thought leadership.
- **Work environment**: Hybrid approach – offices in La Défense (27th floor of Tour Aurore) with collaborative spaces, auditorium, rooftop terrace, and private gym. On-site presence is valued for social cohesion and innovation.
- **Perks**: Guaranteed certified training each year; sports communities (Running, Football, Yoga); participation in major events like Marathon de Paris. Great Place to Work certified (Top 30 in France with 83% employee approval).
- **Hiring process**: 3-step recruitment (Talent Acquisition + Business Developer, technical employee interview with logic exercises and algorithmic challenges, Head of Department final round). AI tools may be used in application review.

## Sources
1. [margo.com – Company overview](https://www.margo.com/en/accueil-english/)
2. [margo.com – Company Life](https://www.margo.com/en/company-life/)
3. [margo.com – DNA & History](https://www.margo.com/en/dna-margo-en/)
4. [margo.com – Recruitment process](https://www.margo.com/en/recruitment-process/)
5. [jobs.lever.co – MARGO careers page](https://jobs.lever.co/margo-group)

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