.NET WinForms Developer
Description
Wynagrodzenie
B2B: 21000 – 23500 PLN / mies. netto
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.
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 Daily Missions
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.
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+).
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.