Sr. Software Engineer - Systems Level

Bellevue, Washington OR Santa Clara, California

Yubico is a global leader in identity security and creator of the Yubi Key, the original hardware-backed passkey. We are publicly traded on Nasdaq Stockholm; our global footprint includes headquarters in Stockholm, Sweden, Silicon Valley, California; and Singapore.

At Yubico, we are guided by a shared belief that your work matters. We operate under a cultural philosophy of Speed with Integrity, pushing the boundaries of technology to secure the AI frontier—protecting both human and agentic AI interactions—and leading the transition to post-quantum cryptography. In everything we do, we live by our core values:

• Battle Friction: We constantly look for new ways to simplify our products, our work, and the user experience.
• Inspire Higher: We think big, champion the open internet, and strive to do the right thing even when it is difficult.
• One Team: We are open, responsive, and collaborative, overcoming challenges and celebrating our successes together.

Aligned with our commitment to open standards, we foster a thriving builder ecosystem through the Yubico Developer Program , offering free open-source repositories , libraries, and SDKs to help developers rapidly integrate strong hardware authentication into any application. Through close collaborations with technical partners like Google, Microsoft, and Amazon, as well as newer frontiers like OpenAI, we continue to shape a safer digital world while donating security keys to protect vulnerable communities, journalists, and humanitarian groups worldwide through our Secure it Forward program.

Yubico is looking for a Sr. Software Engineer who is innovative and has a passion for building security solutions and software. You will join our Production and Fulfillment Services (PFS) team. The PFS team develops the software systems that control our Yubi Key production, fulfillment, and manufacturing. They build integrated end-to-end solutions for production software to enhance and scale our capabilities and ease of use for our operators and supervisors.

• Design, propose, and refactor applications and integrations that enable Windows desktop operators to leverage the full capabilities of our custom production equipment.
• Experiment, create prototypes and refine your work based on user feedback, industry standards, and business needs.
• Work collaboratively across functions with our Product Managers, Production, Hardware, and UX designers to bring the most user-friendly and streamlined software for our operations.
• Hone your skills in designing and developing compelling user experiences using native and cross-platform technologies.
• Expand your technical knowledge of the various security technologies and protocols that Yubi Keys supports (e.g, FIDO2 / Web Authn, FIDO U2F, PIV, etc.).

• Bachelor or MS in Computer Science or a relevant technical discipline or equivalent experience, including 5+ years of software engineering experience.
• Familiarity with operating system internals and services, such as synchronization. primitives, efficient file system access, threading and thread safety, and logging facilities.
• Proven experience of building system software using native and/or memory safe languages such as modern C++, C#, .Net.
• Hands-on experience with REST API integrations.
• Hands-on experience using AI tools such as Claude/Codex/ChatGPT.
• Architecture and design knowledge and experience.
• Knowledge and/or experience with asymmetric cryptography.
• Experience with UI Frameworks (e.g., Avalonia UI, WPF (Windows Presentation Foundation) & XAML).
• Experience working with CI/CD pipelines and hands-on experience with Kubernetes and GCP (or comparable cloud), ideally in production environments.
• Thrives in a dynamic fast paced environment where you will be challenged to become better and expected to make a positive impact on Yubico Engineering.
• Demonstrated ability to learn and apply new technologies.

• Experience with writing and/or utilizing C/C++ libraries and software.
• Experience with Postgres SQL.
• Experience building and interacting with system…