Principal Engineer Partner Platform, APIs & Ecosystem Services

Principal Engineer Partner Platform, APIs & Ecosystem Services

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.

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

We're hiring a Principal Engineer to lead the technical design of Quizlet's extensible learning ecosystem, including our Partner API platform, Connector services, and LearnOS plugin architecture. This is a pivotal role shaping Quizlet's AI-powered integration layer for both human and agentic users. You'll define and implement the secure, scalable infrastructure that enables seamless learning experiences on and off Quizlet, from LMS integrations and productivity tools to AI agents and autonomous workflows.

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 :

• API & Partner Platform Architecture : Own and evolve the external API gateway, SDKs, and developer tooling.
• Connector Runtime & LearnOS : Design sandboxed plugin runtimes to support real-time learning triggers across platforms like Discord, Google Calendar, Grammarly
• Model Context Protocol (MCP) Interoperability : Architect Quizlet's participation in agent-driven ecosystems, to integrate into AI services, like ChatGPT, Comet, Chrome
• Agentic Enablement : Define APIs that allow external agents to create study sets, track progress, or initiate learning actions programmatically
• Secure Developer Experience : Collaborate with Legal and T&S to implement audit, rate limiting, and permissions for third-party integrations
• Data Exchange & Event Streams : Design publish-subscribe infrastructure for syncing learning activity across systems

What you bring to the table :

Compensation, Benefits & Perks :

Massive reach : 60M+ users, 1B+ interactions per week

Cutting-edge tech : Generative AI, adaptive learning, cognitive science

Strong momentum : Top-tier investors, sustainable business, real traction

Mission-first : Work that makes a difference in people's lives

Inclusive culture : Committed to equity, diversity, and belonging

We strive to make everyone feel comfortable and welcome!

We work to create a holistic interview process, where both Quizlet and candidates have an opportunity to view what it would be like to work together, in exploring a mutually beneficial partnership.

We provide a transparent setting that gives a comprehensive view of who we are!

At Quizlet, we're excited about passionate people joining our teameven 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!