Senior C#/.NET Developer – Finance XVA & Event-Driven

Margo Group; Warszawa; Hybrid; PLN 180,000 - 240,000; Full time

Benefits offered by this job

Remote work allowance (120 PLN per月)

Private medical care

Lunch card

Employee Pension Plan

Co-financed Multisport Card

Life insurance

Parking in office

Training and development opportunities

Job summary

Margo Group is seeking a Senior C# Developer to join the Non-linear IT team in Global Markets IT. You will design and evolve high-performance C#/.NET services supporting XVA, liquidity and cash-forecasting workflows in an agile, multi-city environment.

You will help migrate back-end services to a modern event-driven architecture and implement asynchronous messaging with Rebus, ensuring data integrity and robust documentation. English communication is essential.

Qualifications

• 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 MSSQL 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 LLMs in software development with agentic AI engineering in an enterprise setting.
• Excellent communication skills in English (C1)

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.

Skills

C# / .NET

OO programming

SOLID principles

Asynchronous messaging

Event-driven architecture

MSSQL

DevOps pipelines

Rebus

Git/Bitbucket

TeamCity/Jenkins

Ansible

Dapper

LLMs / agentic AI

English (C1)

Tools

Rebus

Git/Bitbucket

TeamCity

Jenkins

Ansible

Dapper

Job description

Margo Group is seeking a Senior C# Developer to join the Non-linear IT team in Global Markets IT. You will design and evolve high-performance C#/.NET services supporting XVA, liquidity and cash-forecasting workflows in an agile, multi-city environment.

You will help migrate back-end services to a modern event-driven architecture and implement asynchronous messaging with Rebus, ensuring data integrity and robust documentation. English communication is essential.