Software Engineer (Cross-Platform Applications)

Software Engineering

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.

The Role

We are looking for a versatile Software Engineer to join our Stockholm-based team to help shape the future of Yubico’s software products. In this role, you will focus on building high-quality, secure applications across desktop and mobile platforms using Flutter, while also contributing to our command-line tools and libraries. As part of our team, you will play a key role in refining our cross-platform strategy. While our team includes iOS and Android experts to address platform-specific requirements, we look for a generalist who won’t shy away from working in these environments. You should be eager to explore new technologies and take full ownership of your work. We encourage you to use the best tools for the job, including AI. Ultimately, you are accountable for the quality, security, and performance of the code you ship.

Tasks & Responsibilities:

Develop, test, and maintain cross-platform graphical applications using Flutter for Desktop and Mobile.
Contribute to the development and maintenance of CLI tools and libraries alongside graphical applications.
Take end-to-end ownership of features, from initial design through to packaging and deployment.
Collaborate with UX/UI designers to implement intuitive and beautiful user interfaces.
Ensure code quality through rigorous testing and maintain full accountability for all code you ship, regardless of how it was created.

Basic Qualifications:

Bachelor or MS in Computer Science, a relevant technical discipline, or equivalent work experience
Strong programming fundamentals and experience with at least one modern UI framework
Experience building mobile (iOS/Android) and/or desktop (Windows/macOS/Linux) applications
A versatile mindset with the ability to learn and adapt to new technologies (like Dart/Flutter or Rust) quickly.
Ability to write secure, testable, and maintainable code
Self-motivated with a high degree of autonomy and the ability to take full ownership of the codebase

Bonus Qualifications:

Experience with Flutter development in a production environment
Experience with cryptography (PKI, digital signatures, etc)
Experience with CI/CD pipelines (e.g. Github Actions)
Experience integrating with native APIs or lower-level libraries

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 this form is used for managing Yubico’s recruitment activities, which include facilitating any application you make, setting up and conducting interviews and tests for applicants, evaluating and assessing results and selecting candidates, and as otherwise needed in our recruitment and onboarding processes. The use of your personal data may also be necessary prior to entering into a contract with you (that is prior to offering you a job with Yubico). Your personal data will only be used for the purposes for which it was collected and in accordance with the Yubico Privacy Notice. We only keep your personal data for as long as necessary and in compliance with Yubico’s record retention policies. If you have asked us to, we will keep you informed of other opportunities at Yubico. We do this in various ways, including email and by phone. If at any time you do not want us to contact you or use your information as described herein please contact us at jobs@yubico.com to let us know and we will delete all such information. Providing your personal data is voluntary, but necessary to join our talent community, and if you do not agree to provide your data, we will not be able to consider you as part of our talent community.

As part of providing the requested service, we will transfer your data to be processed by Greenhouse Software Inc., a service provider contracted by Yubico AB and/or its subsidiaries that meets legally mandated privacy requirements. The Yubico Privacy Notice offers more information about Yubico privacy practices, including the lawful basis for processing of personal data, how to lodge a complaint with the supervisory authority, and how to contact Yubico to exercise your data subject rights. In this notice, when we refer to "Yubico", "us", "we" or "our", we mean the Yubico group company or companies that you apply to, or correspond with, and which are responsible for any personal data collected about you.