---
title: 'senior c# at MARGO'
canonical: 'https://feeny.ai/job/senior-c-margo-warsaw-fjsw9jmf0r05'
type: 'job'
last_seen: '2026-09-07'
---

# senior c# at MARGO

- **Company:** MARGO
- **Location:** Warsaw, Poland
- **Compensation:** PLN 170–PLN 190/hr
- **Employment:** contract
- **Work type:** remote
- **Posted:** 2026-08-03
- **Last confirmed live:** 2026-09-07
- **Apply:** https://jobs.lever.co/margo-group/ac926b9b-1088-4255-9045-d129400bc445

## Job description

Description & Requirements We are seeking a Senior C# Developer to join the Non‑Linear IT team within Global Markets IT. The team builds and maintains the core applications that support XVA, liquidity, and financial‑resource management. You will work in an agile, collaborative environment in team distributed between London, Paris and Kraków, delivering clean, maintainable code while helping migrate our back‑end services to a modern event‑driven architecture. Senior C# Developer Responsibilities: Design, develop, and evolve high‑performance C#/.NET services that power XVA, liquidity and cash‑forecasting workflows. Contribute to the migration to a modern, event‑driven architecture. Implement asynchronous, message driven communication using Rebus and ensure data integrity Participate in full‑cycle DevOps processes: source control (Bitbucket/GIT), CI/CD pipelines (TeamCity, Jenkins), and configuration management (Ansible). Apply knowledge of Large Language Models (LLMs) and agentic AI to improve coding efficiency, code review, and automated testing within an enterprise setting. Provide technical mentorship, conduct code reviews, and champion best‑practice patterns (OO design, SOLID, clean architecture). Deliver high‑quality software under tight deadlines while maintaining attention to detail and robust documentation. Requirements: 5+ years of professional experience with C#/.NET (Windows Services, ASP.NET Web API, SignalR). Strong command of Object‑Oriented Programming, design patterns, and SOLID principles. Proven experience with service‑oriented architectures and asynchronous messaging (Rebus). Advanced knowledge of MS SQL and hands‑on with DevOps tools: Git/Bitbucket, TeamCity/Jenkins, Ansible. Familiarity with ORM libraries (e.g., Dapper) and version‑controlled build pipelines. Understanding of the capabilities of LLM's in the software development process with practical experience of agentic AI engineering in an enterprise environment. Excellent communication skills in English (C1) Nice‑to‑Have: Front‑end development experience with HTML, JavaScript/TypeScript, React, Redux. Financial domain knowledge: Financial products (Listed / OTC) PnL Explain, risks (Delta, Gamma, Theta, Vega) XVA (CVA, FVA, ColVA) Liquidity Risk (RNFB, NSFR) Cash Forecasting Balance Sheet Metrics (Leverage Exposure) Pre-trade calculation and booking workflow We offer: Equivalent for remote work expenses (120 PLN per month) Stable employment in the international company Fully paid private medical care for employee Pre-paid lunch card Employee Pension Plan Co-financed Multisport Card Life insurance Car parking availability in the office building Trainings and development opportunities We invite you to apply with your resume in English.

## 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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