Technical Lead (.NET WinForms)

Our client is a top-tier proprietary trading firm building its own trading technology end-to-end. Their engineering teams develop high-performance Windows desktop applications relied upon by professional traders every day. 

As a Tech Lead, you will combine hands-on coding with architectural ownership to guide the evolution of real-time trading UIs. This role focuses on performance, responsiveness, and user experience at scale. 

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 Daily Missions 

• Lead the architecture and development of real-time WinForms applications. 

• Design and build custom-rendered controls for high-frequency, data-driven UI. 

• Ensure ultra-responsive UI updates in a multi-threaded environment. 

• Profile, debug, and optimize UI performance (latency, GC pressure, redraw behavior). 

• Work closely with traders and C++ backend teams to deliver reliable, low-latency features. 

• Mentor engineers through reviews, design sessions, and technical coaching. 

• Work with source control and support transition plans (e.g., SVN to Git). 

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. 

Nice to Have 

• Experience with trading systems or real-time market data environments. 

• Familiarity with C++ interop or mixed managed/unmanaged architectures. 

• Comfort working with Figma or similar UI collaboration tools. 

Reasons Why You Would Enjoy Working With Us

• We work in the latest technologies and with international clients, and our projects are polished from < to /> - learn about some of the projects we have completed.

• We organize TechTalks, meet-ups and create guilds where we exchange knowledge - you can learn a lot from your teammates.

• We have a close-knit team and we make sure to have regular integrations - we often go out to celebrate together.

• You can work remotely or choose to work from our offices in Wroclaw or Bielsko-Biala. However, we count on your openness to occasionally visit the office for team meetings or client visits, or possible occasional trips to the client's headquarters.

• You can adjust your working hours to suit your needs, starting your day between 7:00 and 10:00 am.

• You can work with great specialists in their fields who also have a sense of humor and other after-hours hobbies. It is the people who create the unique atmosphere and relaxed atmosphere at CSHARK.

• We have a flat structure - we are not a corporation and don't want to be one 🙃.

• We offer bonuses for employee referrals (from 3000 PLN to 7000 PLN).

• We organize remote English classes and provide access to the company library. You can also become an author/author of articles published on our technical blog - https://cshark.com/blog/.