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Cshark Logo Cshark · IT - Software Development

.NET WinForms Developer

Poland, Wrocław B2B 125.00 - 140.00 PLN / Hour · Job Posted December 27, 2025
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Job Description

We are looking for an experienced .NET WinForms Developer to join the frontend engineering team and help build high-performance, real-time trading applications used by professional traders. This role is not about configuring UI frameworks – it is about crafting fast, responsive, custom-rendered desktop UI.

Job Responsibility

  • Design, implement and optimize custom WinForms controls (charts, grids, interactive visualization components)
  • Work with continuous real-time data streams and ensure ultra-responsive UI under load
  • Ensure smooth multi-threaded UI updates without blocking or freezing
  • Collaborate with backend engineers (C++ systems) to maintain low-latency TCP/socket communication
  • Profile, debug, and tune rendering performance (GC pressure, paint cost, batching, flicker control)
  • Improve engineering practices, and influence UI architecture and usability

Requirements

  • 5+ years of hands-on experience developing desktop applications in C#/.NET (preferably .NET 8)
  • Strong expertise in Windows Forms
  • Proven experience building custom UI controls from scratch (inheriting from base controls and implementing custom rendering – not configuring DevExpress/Telerik/Infragistics)
  • Experience working with continuous real-time data streams, where data is pushed to the UI (not periodic refresh)
  • Strong understanding of multi-threaded UI applications (updating UI safely from worker threads, avoiding freezes and stalls)
  • Practical experience in UI performance optimization (reducing redraw cost, minimizing GC pressure, batching updates, preventing flicker)
  • Experience working with TCP / socket-based communication
  • Ability to clearly explain previous UI design decisions, trade-offs, and the impact on end users
  • Fluency in English (minimum B2+)

Nice to have

  • Experience with trading systems, market data, or real-time financial applications
  • Familiarity with C++ or interoperability between C# and native components
  • Understanding of high-performance visualization and data interaction patterns

What we offer

  • 100% remote work
  • Flexible hours
  • International projects
  • Business english lessons
  • Participation in charity actions
  • In-house technology workshops
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