Senior Software Engineer – Desktop Applications (Linux/Windows)

2026
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
Security & Communication
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
Systems / Low-Level Integration
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
What We´re Looking For
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.
What We Offer
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.
Role
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:
office@backbone.io

Work arrangement
No