Sr. Fullstack Engineer II, Khan Kids

San Mateo, CA / Remote friendly (Continental US + Hawaii + Canada)

Khan Academy is a nonprofit on a mission to provide a free, world-class education to anyone, anywhere. We already reach millions of students every month and are growing rapidly. We’re building a library of high-quality instructional and practice resources that empowers learners and the teachers who support them. Whether they’re studying metaphors, mitosis, Marbury v. Madison, or multivariable calculus, we want to offer students the resources to realize that they can learn anything.

Khan Academy Kids is a free and fun learning program for children ages 2 to 8. Kodi Bear and a cast of animated characters lead children on a personalized education journey filled with fun, standards-aligned activities in early literacy, math, executive functioning and social emotional skills. Built by a small but mighty team, Khan Academy Kids is used by millions of children in homes and classrooms around the world.

As a Senior Software Engineer II on the Khan Academy Kids team, you will be a core technical contributor responsible for building and maintaining the fullstack web infrastructure that supports our educational platform. You'll work across the entire technology stack—from frontend user interfaces to backend APIs and databases—ensuring that teachers, parents, and administrators have powerful, intuitive tools to support young learners.

This role offers the opportunity to tackle complex technical challenges while directly contributing to our mission of providing free, world-class education to every child.

• Design, build, and maintain fullstack web applications and services that power dashboards and administrative tools used by educators and families worldwide.
• Lead complex technical projects from conception through launch, collaborating with cross-functional teams including engineering, product, design, and content to deliver impactful features that advance our educational mission.
• Drive engineering excellence by writing clean, testable, well-documented code, conducting thorough code reviews, and championing best practices that elevate the entire team’s technical capabilities.
• Participate in technical planning and architecture decisions, bringing deep fullstack expertise to shape the long-term technical direction of the Khan Academy Kids platform.

• 7+ years of fullstack web development experience. Strong proficiency in modern web frameworks with a demonstrated ability to work across frontend and backend systems.
• Project leadership capabilities, with the ability to drive initiatives from concept through launch. Capable of coordinating with cross-functional stakeholders and managing complex technical projects.

• Extensive backend development experience building RESTful APIs and server-side applications, with a strong understanding of web application architecture, authentication, and security best practices.
• Experience working with relational databases (SQL), including schema design, query optimization, and data modeling for scalable applications.
• Demonstrated ability to design, build, and maintain complex, testable software systems while upholding high standards for readability and automated testing.

• High empathy for the Khan Academy Kids audience and a genuine passion for the mission to deliver a free, world-class education to every child.
• Experience working collaboratively with both technical and creative team members.
• A commitment to pushing the team forward through technical contributions, mentorship, and solving hard technical problems.

• Experience with C++ and understanding of native mobile development workflows
• Experience building educational apps and tools for kids or educators
• Prior experience in a startup or small team environment

We may be a non-profit, but we reward our talented team extremely well! We offer:

• Ample paid time off as needed – Your well-being is a priority.
• Remote-first culture - that caters to your time zone, with open flexibility as needed, at times
• Generous…