Must have

• .NET

• Windows Forms

• UI

• C++

• TCP

• C#

• Polish (C1)

• English (C1)

Requirements description

The Essentials We're Seeking

• 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+).

Offer description

We are looking for an experienced .NET WinForms Developer to join the frontend team and help design, develop, and optimize high-performance trading applications.

IN SHORT:

🌎 100% remote or from the office (Wrocław, Bielsko-Biała) - You choose!

💰 125 - 140 PLN/h

☑️ B2B contract

💻 >5 years of commercial programming experience

Your responsibilities

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