Senior C# Developer

New
M
MargoFinancial markets
Workplace type: remote; Locations: London, Centre, Paris, Rue Poissonnière 46, Kraków, Centre, London, Country code: GBFull-TimeSenior
Salary160 - 190 PLN per hour
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Job Details

Languages
Excellent communication skills in English (C1)
Experience
5+ years of professional experience with C#/.NET
Required Skills
Microsoft SQL ServerC#ASP.NET Web API.NET

Requirements

  • Have 5+ years of professional experience with C#/.NET.
  • Have experience with Windows Services, ASP.NET Web API, and SignalR.
  • Demonstrate strong object-oriented programming, design patterns, and SOLID principles.
  • Have proven experience with service-oriented architectures and asynchronous messaging using Rebus.
  • Have advanced knowledge of MS SQL.
  • Have hands-on experience with Git/Bitbucket, TeamCity or Jenkins, and Ansible.
  • Be familiar with ORM libraries such as Dapper and version-controlled build pipelines.
  • Have practical experience with agentic AI engineering in an enterprise environment.
  • Have excellent English communication skills at C1 level.

Responsibilities

  • Design, develop, and evolve high-performance C#/.NET services for XVA, liquidity, and cash-forecasting workflows.
  • Contribute to migration to a modern, event-driven architecture.
  • Implement asynchronous, message-driven communication using Rebus and ensure data integrity.
  • Participate in DevOps processes, including source control, CI/CD pipelines, and configuration management.
  • Apply LLMs and agentic AI to coding efficiency, code review, and automated testing.
  • Provide technical mentorship and conduct code reviews.
  • Champion object-oriented design, SOLID principles, and clean architecture.
  • Deliver software under tight deadlines and maintain robust documentation.
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160 - 190 PLN per hour
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