.NET Developer
We are looking for a .NET Developer to join the front-office Trading Tool team that builds and maintains high-performance applications used by traders for market-making. You will work on a complex system combining WPF/DevExpress interfaces, browser-based tools, and integrations with multiple internal APIs. The team operates in a distributed setup between France and Poland.
The role requires working from the Warsaw office two to three days per week.
Your tasks
Design, develop, test, and deploy high-performance trading applications operating in a multi-threaded environment
Build and maintain WPF/DevExpress user interface components used by traders
Translate technical and functional requirements into detailed user stories and collaborate closely with Agile Masters and Business Analysts
Deliver and support applications through Continuous Delivery (DevOps)
Maintain and improve production support tools and participate in non-regression testing
Recommend and implement improvements to application performance, architecture, and development processes
Provide clear and consistent progress updates to traders and stakeholders
Requirements
Minimum 5 years of experience in backend C# development
Strong understanding of multithreaded programming and microservices architecture
Experience with WPF/DevExpress
Fluency in English (spoken and written)
Excellent communication and teamwork skills
Proactive, solution-oriented, and collaborative mindset
Open to a hybrid work model (2-3 days per week on-site)
Fluent in Polish required
Residing in Poland required

Sii
Sii Polska to czołowy dostawca doradztwa technologicznego, transformacji cyfrowej oraz usług biznesowych i inżynieryjnych. Firma obecna jest na rynku od 2006 roku, zatrudnia ponad 7 300 ekspertów, jedenastokrotnie zdobył...
.NET Developer
.NET Developer