Principal Engineer – User Identity, Messaging & Trust Infrastructure

About Quizlet

At Quizlet, our mission is to help every learner achieve their outcomes in the most effective and delightful way. Our $1B+ learning platform serves tens of millions of students every month, including two-thirds of U.S. high schoolers and half of U.S. college students, powering over 2 billion learning interactions monthly.

We blend cognitive science with machine learning to personalize and enhance the learning experience for students, professionals, and lifelong learners alike. We’re energized by the potential to power more learners through multiple approaches and various tools.

Let’s Build the Future of Learning

Join us to design and deliver AI-powered learning tools that scale across the world and unlock human potential.

About the Role

We’re seeking a Principal Engineer to architect the future of identity, account management, user communication infrastructure, and trust & safety systems at Quizlet. This high-impact role will help shape Quizlet into the most secure, intelligent, and trusted learning platform on the internet.

You’ll be the hands-on technical leader driving the evolution of our core user platform, guiding strategic investments in authentication, consent frameworks, martech, and safety tooling — all while partnering closely with product, marketing, legal, and data / ML teams.

We’re happy to share that this is an onsite position in our San Francisco office. To help foster team collaboration, we require that employees be in the office a minimum of three days per week : Monday, Wednesday, and Thursday and as needed by your manager or the company. We believe that this working environment facilitates increased work efficiency, team partnership, and supports growth as an employee and organization.

In this role, you will

• Identity & Access Architecture : Define and evolve our authentication and authorization architecture (e.g., OAuth 2.0, SSO, MFA)
• Account Lifecycle Management : Own core services powering sign-up, login, recovery, and settings
• Messaging Platform : Architect a scalable, consent-aware system for in-app, push, email and external comms; partner with Braze and marketing teams to drive intelligent engagement
• Trust & Safety Systems : Build infrastructure to support abuse detection, content moderation, and policy enforcement
• Privacy and Consent Frameworks : Ensure platform-wide compliance with data protection regulations (e.g., COPPA, GDPR, FERPA)
• Cross-Org Collaboration : Influence engineering and legal peers on data minimization, secure defaults, and safety practices

What you bring to the table

Compensation, Benefits & Perks

Why Join Quizlet?

We strive to create a culture that is inclusive and impactful. Quizlet has massive reach, cutting-edge technology, strong momentum, mission-first culture, and a commitment to diversity, equity, and belonging.

In Closing

At Quizlet, we’re excited about passionate people joining our team—even if you don’t check every box on the requirements list. We value unique perspectives and believe everyone has something meaningful to contribute. Our culture is all about taking initiative, learning through challenges, and striving for high-quality work while staying curious and open to new ideas. We believe in honest, respectful communication, thoughtful collaboration, and creating a supportive space where everyone can grow and succeed together.

Quizlet’s success as an online learning community depends on a strong commitment to diversity, equity, and inclusion. As an equal opportunity employer and a tech company committed to societal change, we welcome applicants from all backgrounds. Women, people of color, members of the LGBTQ+ community, individuals with disabilities, and veterans are strongly encouraged to apply. Come join us!

To All Recruiters and Placement Agencies

Quizlet does not accept unsolicited agency resumes and / or profiles. Please do not forward unsolicited resumes to our website or to any Quizlet employee. Quizlet will not pay fees to any third-party agency or firm nor will it be responsible for any agency fees associated with unsolicited resumes. All unsolicited resumes received will be considered the property of Quizlet.

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