.NET WinForms Developer (Fintech)

Location: Remote or hybrid in Wrocław or Bielsko-Biała, Poland

Salary: 125–140 PLN/h + VAT (B2B)

Company

hirify.global is a software development partner specializing in building complex, high-performance financial and trading systems.

What you will do

• Design, implement, and optimize custom WinForms controls including charts and interactive visualization components.
• Handle continuous real-time data streams to ensure ultra-responsive UI performance.
• Manage multi-threaded UI updates to prevent thread blocking and freezing.
• Collaborate with backend engineers to maintain low-latency TCP/socket communication.
• Profile and tune rendering performance, focusing on reducing GC pressure and flicker.

Requirements

• 5+ years of hands-on experience in desktop development using C# and .NET.
• Strong expertise in Windows Forms and building custom UI controls from scratch.
• Experience with continuous real-time data streams and multi-threaded UI applications.
• Practical knowledge of UI performance optimization and TCP/socket-based communication.
• English proficiency: B2+ level required.

Nice to have

• Experience with trading systems, market data, or financial applications.
• Familiarity with C++ or C# interoperability.
• Understanding of high-performance data visualization patterns.

Culture & Benefits

• Flexible work environment with remote and hybrid options in Poland.
• Exposure to complex, high-load financial software development.
• Opportunity to influence UI architecture and engineering practices.