.NET WinForms Developer

Quick Facts

• 100% remote or from the office (Wrocław, Bielsko-Biała) — you choose
• Rate: 125–140 PLN/h
• B2B contract
• >5 years of commercial programming experience

Description

We are looking for an experienced .NET WinForms Developer to help build high-performance, real-time trading applications for professional traders.

This role focuses on crafting fast, responsive, custom-rendered desktop UI (not configuring UI frameworks). You will design and optimize WinForms controls, handle continuous real-time data streams, and collaborate with backend engineers to keep communication low-latency.

Responsibilities

• 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)
• 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 (safe UI updates from worker threads)
• 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 UI design decisions, trade-offs, and their impact on end users
• English fluency (minimum B2+)

Benefits

• Work 100% remote or from the office in Wrocław or Bielsko-Biała
• B2B contract
• 125–140 PLN/h