Sr. Software Engineer - Systems Level

About this role

<div class="content-intro"><h3><strong>Meet Yubico</strong></h3> <p>Yubico is a global leader in identity security and creator of the YubiKey, 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.</p> <p><strong>Why Join Our Mission?</strong></p> <p>At Yubico, we are guided by a shared belief that your work matters. We operate under a cultural philosophy of <em>Speed with Integrity</em>, 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:</p> <ul> <li><strong>Battle Friction:</strong> We constantly look for new ways to simplify our products, our work, and the user experience.</li> <li><strong>Inspire Higher:</strong> We think big, champion the open internet, and strive to do the right thing even when it is difficult.</li> <li><strong>One Team:</strong> We are open, responsive, and collaborative, overcoming challenges and celebrating our successes together.</li> </ul> <p>Aligned with our commitment to open standards, we foster a thriving builder ecosystem through the<a href="https://developers.yubico.com/"> Yubico Developer Program</a>, offering free<a href="https://developers.yubico.com/Software_Projects/"> open-source repositories</a>, 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 <a href="https://www.yubico.com/why-yubico/secure-it-forward/"><em>Secure it Forward</em></a> program.</p></div><h2><strong>The</strong> <strong>Role</strong></h2> <p>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 YubiKey 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.</p> <h2><strong>Tasks &amp; Responsibilities:</strong></h2> <ul> <li>Design, propose, and refactor applications and integrations that enable Windows desktop operators to leverage the full capabilities of our custom production equipment.</li> <li>Experiment, create prototypes and refine your work based on user feedback, industry standards, and business needs.</li> <li>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.</li> <li>Hone your skills in designing and developing compelling user experiences using native and cross-platform technologies.</li> <li>Expand your technical knowledge of the various security technologies and protocols that YubiKeys supports (e.g, FIDO2 / WebAuthn, FIDO U2F, PIV, etc.).</li> </ul> <h2>Basic Qualifications:</h2> <ul> <li>Bachelor or MS in Computer Science or a relevant technical discipline or equivalent experience, including 5+ years of software engineering experience.</li> <li>Familiarity with operating system internals and services, such as synchronization. primitives, efficient file system access, threading and thread safety, and logging facilities.</li> <li>Proven experience of building system software using native and/or memory safe languages such as modern C++, C#, .Net.</li> <li>Hands-on experience with REST API integrations.</li> <li>Hands-on experience using AI tools such as Claude/Codex/ChatGPT.</li> <li>Architecture and design knowledge and experience.</li> <li>Knowledge and/or experience with asymmetric cryptography.</li> <li>Experience with UI Frameworks (e.g., Avalonia UI, WPF (Windows Presentation Foundation) &amp; XAML).</li> <li>Experience working with CI/CD pipelines and hands-on experience with Kubernetes and GCP (or comparable cloud), ideally in production environments.</li> <li>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.</li> <li>Demonstrated ability to learn and apply new technologies.</li> </ul> <h2><strong>Preferred Qualifications:</strong></h2> <ul> <li>Experience with writing and/or utilizing C/C++ libraries and software.</li> <li>Experience with Postgres SQL.</li> <li>Experience building and interacting with system level services.</li> <li>Comfortable interacting with operating system APIs from application code, such as interacting with serial ports or block devices.</li> <li>Comfortable working with binary serialization protocols and formats.</li> </ul> <h2><strong>Bonus Skills:</strong></h2> <ul> <li>Experience developing software to control robotics (e.g., developing an orchestration engine controlling robotic arms).</li> </ul> <p>&nbsp;</p> <p>&nbsp;</p> <h3><span style="text-decoration: underline;"><strong>U.S. benefits designed for your overall well-being:</strong></span></h3> <p><strong>Health coverage.</strong> We’ve got you covered with top of the line health plans, including dental and vision. We pay 100% of your premium and 85% for your family.</p> <p><strong>Retirement plan.</strong> Our retirement plan includes a 401K dollar per dollar match up to 6% with a cap of $6K/year. Immediate vesting.</p> <p><strong>Wellness reimbursement.</strong> We offer $1,200.00 in wellness earnings (prorated based on start date) that you can use on your gym membership, a massage, or your favorite online fitness classes. This is a taxable benefit if you choose to