Senior .NET (WPF) Developer

About Skylum

Skylum empowers millions of photographers worldwide with award-winning photo editing software that blends AI-driven automation with complete creative control, making editing accessible and enjoyable for everyone. We foster an environment that champions growth, learning, and creativity, offering flexible schedules and a supportive team to enable your best work. As a proudly Ukrainian company, Skylum actively supports initiatives accelerating Ukraine's victory.

About the Role

We are seeking a talented and experienced C#/.NET Desktop Developer to architect and build high-performance features for our cutting-edge photo editing software. You will play a crucial role in optimizing performance, ensuring UI responsiveness, and maintaining a seamless bridge between .NET and native C++ libraries. This position is ideal for a developer who thrives in an Agile environment and enjoys tackling complex technical challenges.

Responsibilities

• Architect and build high-performance features using .NET 10 and WPF, ensuring the UI remains fluid and responsive under heavy loads.
• Develop and optimize C++/CLI wrappers to maintain a seamless, memory-safe bridge between our .NET environment and native C++ core libraries.
• Profile and hunt down complex desktop issues, eliminating memory leaks, fixing UI thread blockages, and resolving interop vulnerabilities.
• Deliberately refactor legacy modules, gradually transforming older parts of the codebase into clean, testable, and modern architecture.
• Conduct high-standard code reviews.
• Leverage modern AI-assisted tools to accelerate routine coding, unit-test generation, and documentation.
• Collaborate closely with the team during 2-week sprints to flesh out technical requirements, cover tricky corner cases, and estimate complex tasks.

Requirements

• 3-5+ years of commercial C#/.NET desktop development experience.
• Deep WPF expertise: Strong mastery of MVVM, data binding, custom controls, and a solid grasp of the UI thread / Dispatcher model and async programming.
• Real experience with .NET memory management and performance profiling – and a proven track record of fixing leaks, not just describing them.
• Practical exposure to native C++ interop (C++/CLI, P/Invoke, or marshaling).
• Solid understanding of OOP, SOLID, clean code, and a genuine code-review habit.
• Comfortable in an Agile environment, writing clear acceptance criteria and handling corner cases.
• A practical, daily relationship with AI-assisted development tooling (Copilot, Cursor, etc.) to boost productivity.
• English strong enough to live in official documentation and deep-dive technical literature (MSDN, specs, deep-dive articles).

Nice to Have

• Experience with Image/graphics processing, GPU, or DirectX/Direct2D.
• Experience with WinUI 3.
• A background in photo, creative, or media desktop apps.
• Comfort improving large legacy codebases through deliberate and safe refactoring.
• Native instinct for desktop pitfalls - handling leaks, permission levels, and UI-thread affinity.
• Photography as a hobby.

What We Offer

For Personal Growth:

• A chance to work with a strong team and make substantial contributions to our award-winning photo editing tools.
• An educational allowance to ensure your skills stay sharp.
• English, German, and Polish classes to strengthen your capabilities.

For Comfort:

• A great environment with true professionals and amazing colleagues.
• The choice of working remotely or in our office space in Podil, equipped for productive and comfortable work.

For Health:

• Medical insurance.
• Twenty-one days of paid sick leave per year.

For Leisure:

• Twenty-one days of paid vacation per year.
• Fun team-building activities.

Application Process

• An interview with our Talent Acquisition Specialist
• Professional/technical interview
• Management interview
• Job offer!