---
title: 'C# / .NET Developer – Front Office Liquidity, Treasury & Risk Systems at MARGO'
canonical: 'https://feeny.ai/job/c-net-developer-front-office-liquidity-treasury-risk-systems-margo-london-ea8faa6gm4jv'
type: 'job'
last_seen: '2026-11-09'
---

# C# / .NET Developer – Front Office Liquidity, Treasury & Risk Systems at MARGO

- **Company:** MARGO
- **Location:** London, United Kingdom
- **Employment:** contract
- **Work type:** hybrid
- **Posted:** 2026-11-04
- **Last confirmed live:** 2026-11-09
- **Apply:** https://jobs.lever.co/margo-group/6bed8e22-f0ea-4499-a50d-b93753fa307e

## Job description

C# / .NET Developer – Front Office Liquidity, Treasury & Risk 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, distributed architectures, high-throughput engines, and complex financial calculations. Joining MARGO means working in demanding Front Office, Global Markets, and Treasury IT environments while benefiting from a human-sized structure, dedicated technical support, and tailored career development paths.

Business Context

You will join the Front Office / Treasury IT environment  of a premier Tier-1 investment bank in London.

Working within the Non-Linear IT team across distributed locations, you will engineer mission-critical systems supporting Liquidity Risk, Treasury ALM, XVA, and Financial Resource Management. The platform operates in direct proximity to trading desks, Treasury, and risk managers to calculate balance-sheet funding costs and risk exposures in real time.

The team is actively executing an advanced migration toward a modern, event-driven back-end microservices architecture while supporting interactive UI tools used daily by several hundred users.

## Role Overview

We are looking for a passionate Senior C# / .NET Developer to build, modernize, and scale our core front-office calculation engines.

This is a 100% hands-on Individual Contributor seat. You will write clean, high-performance back-end code and translate complex financial logic directly into production systems without business analyst or translation layers.

## Key Responsibilities

Design & Engineering

- Design, build, and optimize high-performance back-end calculation engines using modern C# .NET.

- Develop asynchronous, message-driven microservices (using Rebus / messaging queues) and Windows Services for distributed processing.

- Build and tune database objects, complex queries, and data access layers using MS SQL Server and Dapper.

- Implement real-time communication feeds and RESTful APIs using ASP.NET Web API and SignalR.

- Leverage LLMs and practical agentic AI workflows (Copilot, Claude) within daily engineering to accelerate testing, refactoring, and delivery.

Functional Implementation

Implement core calculation logic across at least two of the following business areas:

- Liquidity Risk & Treasury: Cash-flow time-bucketing, NSFR, RNFB, LCR, or liquidity buffers.

- Cash Forecasting: Forward cash projections and contractual vs. behavioral maturities.

- Balance Sheet & Capital Metrics: Leverage exposure and financial resource utilization.

- XVA & Pricing Adjustments: CVA, FVA, ColVA, and funding costs.

- Risks & Greeks: Non-linear sensitivities (Delta, Gamma, Vega) and PnL Explain.

- Financial Products: Listed or OTC derivatives.

- Pre-Trade Analytics: Trade simulation, margin/funding impact checks, and booking workflows.

Delivery & Engineering Standards

- Deliver clean, testable, and maintainable code adhering to SOLID principles and design patterns.

- Participate in automated CI/CD pipelines using Git (Bitbucket), TeamCity, Jenkins, or Ansible.

- Maintain high standards of ownership, transparency, and operational risk mitigation.

Technical Environment

Core Technologies

- Languages & Frameworks: C# .NET, Windows Services, ASP.NET Web API, SignalR

- Architecture & Messaging: Event-driven architecture, asynchronous message-driven systems (Rebus), Service-Oriented Architecture (SOA)

- Data & Storage: MS SQL Server (performance tuning, schema design), Dapper

- DevOps & CI/CD: Git, TeamCity, Jenkins, Ansible

- Modern Tooling: Practical experience applying LLMs / agentic AI tools in software engineering

Valued / Nice-to-Have

- Front-end web development with React, Redux, TypeScript, and HTML

Required Experience & Skills

Essential

- Proven experience as a Senior C# .NET Developer in demanding, performance-sensitive banking environments.

- Deep understanding of Object-Oriented design patterns, asynchronous programming, and multithreading.

- Solid back-end experience building event-driven services, messaging systems, and Windows Services.

- Strong MS SQL Server database expertise and experience with lightweight ORMs (Dapper).

- Practical familiarity with enterprise DevOps pipelines and AI developer tools (Copilot/Claude).

- A dedicated individual contributor mindset committed to daily hands-on coding.

## 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 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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