Senior Software Engineer – Desktop Applications (Linux/Windows)

Job Openings

Senior Software Engineer – Desktop Applications (Linux/Windows)

2026

Full time

Location: Budapest

from October

About Us

We are a fast-growing, innovation-driven startup where you can work with cutting-edge technologies across software, firmware, and hardware.

Our solutions combine Linux and Windows applications, device firmware, drivers, and bootloader systems. We work with an agile mindset, a high degree of autonomy, and a collaborative, supportive team culture.

Key Responsibilities

Application Design & Development:

• Design and develop cross-platform desktop applications for Linux and Windows using C/C++ and C#/.NET
• Own the software architecture end-to-end, establishing patterns, module boundaries, and coding standards that other engineers on the team will build on
• Write clean, maintainable, well-documented code and review teammates’ work against the architecture you define
• Balance platform-specific requirements (Linux vs. Windows) while maximizing shared/reusable code across the codebase

• Design and implement encrypted communication channels between application components and external services (TLS, mutual authentication, key management)
• Apply secure coding practices to guard against common vulnerabilities (memory safety issues, injection, privilege escalation, etc.)
• Evaluate and select appropriate cryptographic libraries and protocols for the application’s needs

• Configure and build custom Linux kernels or kernel modules (custom build flags/config options) to support application requirements — deep kernel internals expertise not required, but comfort with the build/config process is expected
• Develop OS-level plugins, background services, or lightweight drivers that extend application functionality on Linux and/or Windows
• Implement and troubleshoot network communication at the application level and, where needed, at the OS/service level

• 5–8 years of experience developing desktop applications for Linux and Windows
• Strong proficiency in C/C++ and C#/.NET
• Solid understanding of security fundamentals: encryption, authentication, secure network protocols
• Experience designing software architecture for multi-developer teams — defining structure others follow, not just writing code
• Familiarity with the Linux kernel build/configuration process (custom kernel flags, module compilation)
• Experience with networking (TCP/UDP/HTTP or custom protocols)
• Experience writing Windows services and/or Linux daemons/systemd services
• Comfortable working across both OS ecosystems and their differing toolchains (GCC/Make/CMake vs. MSVC/Visual Studio)
• Confident Hungarian and English, both written and spoken. German is a plus.

• The opportunity to contribute to the development of innovative products at a rapidly growing company.
• Strong opportunities for professional development, with a clear technical and career path.
• A flexible and supportive international company culture.
• Home office and flexible working hours.
• A competitive benefits package.
• The opportunity to gain valuable experience through exciting international projects.

You can expect a varied role, attractive conditions, a professional environment, and the security of a successful company. We look forward to receiving your detailed application with photo and letter of motivation by e-mail to:

[email protected]