Software Engineer, Expo/Flutter

About Clerk

Clerk is on a mission to solve user management once and for all. We are a globally distributed team dedicated to providing best-in-class developer experience, with obsessive attention to every detail. Today, we provide developers with full-stack React components and hooks like <SignUp/>, <SignIn/>, <UserProfile/>, useUser, and useOrganization. These APIs allow developers to build hard-to-get-right user and organization management flows. We believe that a component is worth a thousand APIs.

About the Role

We're looking for a passionate Software Engineer to take ownership of our Expo and Flutter SDKs. Our Expo SDK is already one of our most popular offerings, trusted by thousands of developers building React Native applications. Our Flutter SDK recently entered beta and is already being used in production by many customers.

As the lead engineer for these mobile frameworks, you'll be responsible for maintaining, supporting, and continuously improving these critical SDKs that enable developers to add authentication and user management to their mobile applications with just a few lines of code.

What you’ll do

SDK Development & Maintenance

• Take full ownership of Clerk's Expo and Flutter SDKs, from architecture to implementation

• Design and implement new Clerk features that make authentication even better for mobile developers

• Maintain high code quality, security standards, and performance across both SDKs

• Write comprehensive documentation, guides, and code examples that developers actually want to read

Developer Experience

• Collaborate with our marketing & support teams to understand pain points and feature requests

• Create sample applications and integration guides that showcase best practices

• Respond to community questions and provide technical support for SDK-related issues

• Contribute to our open-source ecosystem and engage with the developer community

Cross-Platform Excellence

• Ensure seamless functionality across iOS, Android, and web platforms for both Flutter and Expo

• Work closely with our native iOS and Android developers to maintain consistency across all mobile SDKs

• Stay current with React Native, Expo, and Flutter ecosystem changes and updates

• Optimize for performance, security, and developer ergonomics

Strategic Development

• Define the technical roadmap for mobile SDK development

• Evaluate and potentially lead development for additional mobile frameworks based on customer demand

• Collaborate with Product and Engineering teams to prioritize features and improvements

• Influence Clerk's overall mobile strategy based on your deep ecosystem knowledge

Who you are

Required Experience

• 3+ years of software engineering experience, with significant mobile development focus

• Strong experience with JavaScript/TypeScript (React Native/Expo), ideally direct experience working with Expo

• Experience building and maintaining SDKs, libraries, or developer tools

• Understanding of authentication flows, security best practices, and mobile-specific considerations

• Knowledge of authentication protocols (OAuth, SAML, JWT)

• Experience with API integration, state management, and mobile app architecture patterns

• Experience with Git, package managers (pub.dev, npm), and collaborative development workflows

Nice to Have

• Deep expertise in Flutter development, including Dart, widget architecture, and cross-platform considerations - if you only have light Flutter experience or intend to learn as it comes, that's ok, still apply!

• Experience with other mobile frameworks (Ionic, Electron, etc.)

• Background in developer