senior c#

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.