StoneX

Senior .NET Developer

Job Locations PL-Kraków
Requisition ID 2025-13222
Category (Portal Searching)
Information Technology
Position Type (Portal Searching)
Experienced Professional

Overview

Permanent, full-time, hybrid

 

Connecting clients to markets – and talent to opportunity.

 

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:

  • Back End: C#, .NET (.NET Core, ASP.NET MVC & Web API), Kafka, AMQ, Kubernetes
  • Cloud: Azure

Responsibilities

Position Purpose: Senior .NET Developer will be a technical expert with a strong focus on software design and engineering, who likes to work with similar technology-oriented individuals in delivering efficient and elegant software and IT solutions. They are great at writing software and explaining it to both technology and business-oriented audiences, and work efficiently with other software and QA engineers in the team to deliver projects. They must be good at assisting more junior members of the team. 

 

The candidate should actively evaluate new products and technologies to build solutions that can streamline business operations. They must be delivery-focused and have strong knowledge of object-oriented development methodologies, and be open to facing challenges and learning new technologies. They will be required to be proactive, carrying out their day-to-day activities and be involved in technical discussions with other Senior developers and Tech and Team Leads. The candidate will be working on the API used to provide it with full trading functionality, including authentication, trading, pricing, and much more. 

 

Primary duties will include:

  • Develop highly performant solutions using the latest .NET technologies. 
  • Debug live and development problems using any means necessary to understand the problem and come up with a solution. 
  • Build applications from scratch or pick up existing applications and modify them to meet business or technology needs. 
  • Working with RESTful API development and modern architectures. 
  • Interact with other teams and functions within the business or technology department to come up with the best solution for the task at hand. 
  • Take part in planning and estimation work for each sprint, actively involved in discussing technical solutions. 
  • Strong focus on solution design, performance, and scalability. 
  • Ensure that solutions align with best practices and modern design principles. 
  • Use a test-driven approach to development in both unit and integration testing. 
  • Utilize effective continuous integration builds and techniques for efficient and agile development. 
  • Maintain an appropriate level of competence through ongoing training, making requests for updates or development as required. 
  • Assist junior members of the team. 
  • Participate in conducting code reviews and design/architecture sessions. 
  • Continually evaluate new technologies and tools to determine if they could enhance the current offerings and processes. 

Qualifications

To land this role you will need:

  • At least 3-5 years of C# / .NET development. 
  • Good C# & .NET knowledge (.NET Core, ASP.NET MVC & Web API). 
  • Practicing Automated Testing – TDD/BDD. 
  • Understanding of messaging systems (Active MQ). 
  • Experience in RESTful web service API development and architecture, especially with high-traffic APIs. 
  • Experience with streaming data using WebSocket technologies. 
  • Knowledge of SQL Server & T-SQL. 
  • Working in an Agile Scrum. 
  • Strong communication skills. 

Continuous Integration experience, especially TeamCity, would be a plus. 

Continuous Deployment experience, especially with Octopus, would be beneficial. 

  • NoSQL experience would be advantageous. 
  • Knowledge of modern architectures (CQRS, Event Sourcing). 
  • Experience with financial products would be beneficial.

Education / Certification Requirements: 

  • Bachelor’s degree or higher in Engineering (Computer Systems, Software, IT&T, Systems) or relevant experience.

Working environment:

  • Hybrid - private parking for employees.
  • FTE (UoP).

 

#LI-Hybrid #LI-DK1

Options

Sorry the Share function is not working properly at this moment. Please refresh the page and try again later.
Share on your newsfeed