Sr Fullstack Engineer

SuperTokens is an exciting Y Combinator-backed startup building open-source authentication as an alternative to Auth0, Firebase, and AWS Cognito. The company is experiencing rapid growth with 30-40% month-over-month adoption metrics and is in early monetization stages. As a Sr Fullstack Engineer, you'll be working on core infrastructure that powers authentication for thousands of developers worldwide.

The role offers a unique opportunity to work on open-source projects while getting paid, with direct impact on developer experience. You'll be joining a company that's well-funded, having closed both seed and pre-series A rounds from top-tier US VCs specializing in developer tools. The company has demonstrated strong growth with 25-30% monthly user increase and has successfully attracted customers migrating from major competitors, including apps with 300k+ MAUs.

The position involves working on both frontend and backend SDKs, architecting authentication flows, and contributing to a product that serves as a critical infrastructure layer for web applications. You'll be working remotely with flexible hours, and your work will directly influence the user experience of developers implementing authentication solutions.

The ideal candidate should have strong expertise in full-stack development, including HTML, CSS, JavaScript, and frameworks like React. Knowledge of SQL databases, object-oriented programming languages (Go, Python, Node.js, Java), and DevOps tools like Git and Docker is required. Experience with authentication solutions and open-source contributions would be particularly valuable.