Substack

At Substack, we build software in the service of writers. Our distributed backend system is responsible for taking the content writers create and delivering it to millions of email inboxes every day while keeping spam out. We balance cutting-edge technology with defending our infrastructure’s reliability and security and build thoughtful products that help writers grow their businesses. We’re well-funded, growing and need an experienced security software engineer that can dive into the code and lead implementation for foundational projects around auth, identity, and product security.