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.
Skills Required
- 5+ years 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.
- Hands-on experience with DevOps tools: Git/Bitbucket, TeamCity/Jenkins, Ansible.
- Familiarity with ORM libraries (e.g., Dapper) and version-controlled build pipelines.
- Understanding and practical experience using Large Language Models (LLMs) and agentic AI in enterprise software development.
- Excellent communication skills in English (C1).
What We Do
More than a simple IT consulting group, MARGO is an alchemy of talents with constantly enriched expertise, always encouraged to be dynamic and to flourish. For more than 17 years, we have been carrying out missions of the highest technical complexity, enabling the digital acceleration of our clients, while ensuring a perpetual intellectual and collective stimulation for all our talents. At MARGO it's Consultant First. By joining MARGO, your talent today will remain relevant tomorrow. We bring you into the group not only for what you are today but for the potential you wish to develop. At MARGO, you will be able to build your own path to excellence within our teams and our missions. Tailor-made to serve your ambition and to match your talent. Today, Margo has over 400 employees in 8 entities: ► MARGO Trading Systems: our full stack development offer in market finance ► MARGO Capital Markets: our business offer in market finance ► MARGO Analytics: our expertise in data science and data engineering ► A CAPELLA Consulting: our business offer dedicated to insurance ► CODE BUSTERS: our community of developers ► DELIVERED by MARGO: our 100% remote full stack development entity ► MARGO UK: expertise in complex coding and application support on the English market. ► MARGO Poland: expertise in complex coding in retail Banking on the Polish market
