Software Engineer - (C# / .NET)

About Millennium Millennium is a global, diversified alternative investment firm, founded in 1989. Defined by evolution, innovation and focus, Millennium’s mission is to deliver results for our investors. Our people are empowered with both independence and support: the autonomy to pursue ideas with conviction and the backing of a global network committed to collaboration, disciplined risk management and continuous learning. With opportunities to deepen expertise and accelerate development, talent at Millennium is equipped to adapt, evolve and build lasting impact over time. Discover how transformative growth accelerates impact.

Meet the Team The Treasury Technology team at Millennium is responsible for developing and supporting wide range of software product and services across Treasury ecosystems. In this role, you will work on sophisticated software systems that support our firm’s liquidity management and financing strategy. You will design and implement cutting-edge solutions in close collaboration with our technology, Quantitative modeling, and Treasury teams, contributing directly to strategic funding and liquidity decisions.

What You’ll Do

• Design, develop, and enhance full-stack applications using .NET, C#, ASP.NET Web API, and modern UI frameworks.
• Build rich, responsive user interfaces using Angular, Typescript, and components such as Ag-Grid.
• Apply Object-Oriented Programming, design patterns, SOLID principles, and concurrency concepts to deliver clean, scalable solutions.
• Integrate applications with enterprise databases (MS SQL Server, Sybase, Oracle) and optimize data access and performance.
• Develop and maintain services within message- or service-oriented architectures, leveraging AWS and other cloud technologies.
• Contribute to and refine SDLC processes, Agile practices, and continuous delivery pipelines to improve delivery quality and speed.
• Collaborate with cross-functional teams, troubleshoot complex technical issues, and drive continuous technical improvements in a fast-paced environment.

What You’ll Bring

• 7+ years of full-stack development experience in a technology-focused environment.
• Expert hands-on experience with .NET, including C# and ASP.NET Web API.
• Strong front-end development skills with Angular, Typescript, and UI libraries such as Ag-Grid.
• Deep understanding of OOP, design patterns, service-oriented architecture, concurrency, and SOLID principles.
• Experience working with enterprise databases such as MS SQL Server, Sybase, or Oracle, and with message- or service-oriented architectures.
• Practical experience with AWS and cloud technologies, as well as continuous delivery tools and modern SDLC/Agile practices.
• Strong problem-solving and analytical skills, with a self-starter mindset and proven ability to thrive in a dynamic, fast-paced environment.
• Excellent written and verbal communication skills; experience with enterprise caching solutions and/or Python is a plus.