Must have

• C#

• .NET

• Windows Forms

• SVN

• Git

• TCP

• C++

• English (C1)

• Polish (C1)

Requirements description

The Essentials We're Seeking

• 8+ years of professional experience in C#/.NET with strong focus on Windows Forms.
• Proven ability to build custom UI controls from scratch (inheriting base controls and implementing custom rendering, not configuring DevExpress/Telerik).
• Hands-on experience with continuous real-time data streaming to the UI ( data pushed, not polled or periodically refreshed).
• Deep understanding of multi-threaded UI architecture (safe UI updates from worker threads, no freezes or stalled redraw).
• Demonstrated skill in UI performance tuning (batching updates, reducing paint cost, minimizing flicker, lowering GC pressure).
• Experience working with TCP / socket communication and interacting with C++ backend systems.
• Ability to explain design decisions clearly and articulate the impact on end-user experience.
• Strong communication skills and experience mentoring or leading developers.
• Fluency in English (minimum C1) to collaborate effectively with stakeholders.

Offer description

Our client is a top-tier proprietary trading firm known for building its own trading technology from the ground up. Their in-house engineering team designs and maintains high-performance Windows desktop applications that traders rely on daily. As a Tech Lead, you’ll combine technical depth with hands-on coding and architectural decision-making to ensure scalability, performance, and an exceptional user experience.

IN SHORT:

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

💰 150 - 190 PLN/h

☑️ B2B contract

💻 >8 years of commercial programming experience

Your responsibilities

1. Lead the architecture and development of real-time WinForms applications.
2. Design and build custom-rendered controls for high-frequency, data-driven UI.
3. Ensure ultra-responsive UI updates in a multi-threaded environment.
4. Profile, debug, and optimize UI performance (latency, GC pressure, redraw behavior).
5. Work closely with traders and C++ backend teams to deliver reliable, low-latency features.
6. Mentor engineers through reviews, design sessions, and technical coaching.

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