Senior .NET Developer

Who are we?

Founded in 2001, MobiSystems is a Bulgarian software company dedicated to empowering users with a better choice for office suite apps. Our feature-rich tools—MobiOffice and MobiPDF—offer a seamless, privacy-conscious, and affordable alternative to traditional office suite software for Windows, Android, iOS, and macOS. Trusted by over 550 million users worldwide, MobiSystems is committed to delivering accessible, cost-effective solutions that make work and personal tasks easier. Our headquartered in Sofia with a team of 200 and we have a sales office in San Diego, CA.

What are we looking for? 

We are currently seeking an experienced .NET/C# Developer to join our Windows platform team and contribute to the development of our Windows applications. You will be responsible for creating a seamless user experience and delivering high-quality, efficient code for our desktop software, analyze, optimize, and refactor existing code for better performance and maintainability, collaborate with cross-functional team members to define, design, and implement new features and improvements.

Requirements:

• 5+ years of professional experience in .NET/C# software development

• Deep proficiency in Software Architecture and Object-Oriented Design (OOD) (SOLID principles, Design Patterns, Dependency Injection)

• Passion for writing good code combined with a strong ability to produce clean, maintainable, and testable solutions

• Fast learner willing to adapt to the Windows Desktop environment (including WPF), with a focus on core application logic rather than just UI

• General understanding of Desktop application programming concepts (e.g., state management, UI threading models, event-driven programming)

• Good understanding of C# asynchronous programming, multi-threading, and memory management

• Strong understanding of algorithms, data structures, and performance optimization techniques

• Strong communication skills & willingness to work in a team

Nice to have:

• Experience with C++, WinRT, or WINAPI is a big plus

• Previous experience with WPF, WinForms, or other Desktop UI frameworks

• Degree in Informatics, Computer Science, Engineering, or equivalent

What do we offer? 

• Working on inspiring products in a team of supportive professionals

• Compelling salary and regular performance assessment with salary review

• Work at the Headquarters of a product company and have a say in the direction of its products

• A great location - right next to a metro station, Paradise Center and the best park in Sofia

• Work from the office, with the option to work from home one day per week

• Opportunities for professional growth and freedom to make an impact

• Multiple secondary benefits: additional health insurance with dental care coverage, sport program, corporate discounts, 25 days paid yearly leave + additional days off, etc.