Senior .NET Developer (Docker/Kubernetes)

With 4,300 employees and over 400,000 retail and institutional clients from more than 80 offices spread across five continents, we’re a Fortune-100, Nasdaq-listed provider, connecting clients to the global markets – focusing on innovation, human connection, and providing world-class products and services to all types of investors.

At StoneX, we offer you the opportunity to be part of an institutional-grade financial services network that connects companies, organizations, and investors to the global markets ecosystem. As a team member, you'll benefit from our unique blend of digital platforms, comprehensive clearing and execution services, personalized high-touch support, and deep industry expertise. Elevate your career with us and make a significant impact in the world of global finance.

Business Segment Overview: Engage in a deep variety of business-critical activities that keep our company running efficiently. From strategic marketing and financial management to human resources and operational oversight, you’ll have the opportunity to optimize processes and implement game-changing policies.

Technology Ecosystem:

• Languages & Frameworks: C#, .NET Core, ASP.NET 

• Architecture: Microservices, Event-driven (Kafka, AMQ), CQRS 

• Cloud & Infra: Azure, Kubernetes, Docker, Rancher 

• Databases: MS SQL Server (T-SQL), NoSQL (a plus) 

• Tooling: Git, Visual Studio, CI/CD pipelines (TeamCity), Octopus, Grafana

Responsibilities

Position Purpose:  This role is ideal for a seasoned .NET engineer who thrives on ownership, enjoys mentoring others, and wants to work on robust APIs that power real trading - including authentication, pricing, order handling, and more. 

You’ll be an essential part of a highly skilled product team, collaborating with other engineers, tech leads, and QAs to build scalable, high-performing systems used by thousands of clients. 

Primary duties will include:

• Develop highly performant solutions using the latest .NET technologies. Build performant, scalable backend services from scratch, or improve existing ones.

• Build applications from scratch or pick up existing applications and modify them to meet business or technology needs. 

• Tackle live production challenges - debug, diagnose, and solve with confidence.

• Design and build APIs and backend logic to support high-volume trading systems. 

• Work closely with team leads and stakeholders to shape features and architecture. 

• Write clean, testable code with a TDD/BDD-first approach. Strong focus on solution design, performance, and scalability. 

• Support and mentor junior engineers in the team. 

• Participate in code reviews, design sessions, and agile ceremonies. 

• Continuously explore and evaluate new technologies that could enhance the platform. 

• Maintain an appropriate level of competence through ongoing training, making requests for updates or development as required. 

Qualifications

To land this role you will need:

• 5+ years of experience in backend .NET/C# development.

• Solid grasp of .NET Core, RESTful APIs, multithreading, and system performance .

• Experience using Kubernetes or Docker – it’s a must! 

• Experience working with high-traffic APIs and messaging systems like ActiveMQ.

• Good SQL Server/T-SQL knowledge; NoSQL is a plus. 

• Familiarity with CI/CD, agile practices, and DevOps tools (TeamCity, Octopus). 

• Strong communication skills and the ability to collaborate across teams. 

• A growth mindset and eagerness to stay current with industry trends.

• Experience with financial systems or real-time data? Big bonus. 

Education / Certification Requirements: 

• Bachelor's degree in Computer Science, Software Engineering, or equivalent experience 

Working environment:

• Hybrid - private parking for employees.

• FTE (UoP).