OneSignal

OneSignal is a push notification & email platform for mobile apps and websites. Our mission is to democratize access to great messaging tools for all publishers. Over the last three years, we’ve grown to deliver 3.6 billion notifications per day for 220,000 apps and websites. Our stack includes React + TypeScript for our dashboard, Ruby on Rails, Rust (for our delivery system), Spark (for data projects), and PostgreSQL with 12 first-party mobile SDKs. Roles listed are onsite and full-time.