Firmware Engineer

Meet Yubico 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. Why Join Our Mission? 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 seeking the next new team member for our Firmware team. We're looking for someone with a passion for security to join us in our work to develop new features for our products. Your role will be to implement established cryptographic protocols, as well as to take part in creating the protocols of tomorrow. As part of our team you'll be working on our core products and the tools and libraries which make them useful. Use your passion, insights, and technical skills to help us create a trusted Internet. Tasks & Responsibilities: • Develop, design and test new features for the firmware of Yubico's products, such as the YubiKey and the YubiHSM. • Write libraries and utilities to expose new features to higher level applications. • Develop integrations with existing systems to enable them to take advantage of our products. Skills & Experience: • Experience with cryptography and security (such as smart cards, PKCS#11, common encryption schemes and cryptographic libraries) • 3+ years experience with writing software for microprocessors with constrained resources • High proficiency in C • Familiarity with Linux, git (ideally CLI) and Python or similar high-level languages • Ability to work independently as well as in a team, capable of taking own initiatives but also listening to others • Experience with integrating/building open source software and the open source community #LI-BR1 We are an equal opportunity employer, we value diversity and uphold an inclusive environment where all people feel that they are equally respected and valued. All applicants will be considered for employment without attention to race, color, religion, sex, sexual orientation, gender identity or expression, age, marital status, religion, national origin, disability, protected Veteran status or any other characteristic protected by law. We'd love to learn about what you can add to our diverse team. We are an E-Verify Participating Employer. Yubico does not accept agency resumes or referrals so please do not send them to our careers staff or employees. Yubico is not responsible for any fees related to unsolicited resumes or referrals. Personal data submitted through t