OneSignal is building the best platform for businesses to intelligently engage with customers across every channel. We provide a simple interface to push notifications, email, and in-app messages, letting content creators focus on quality user engagement instead of complex implementation.
When you pick up your smartphone, the first thing you see is a push notification - maybe there’s a breaking news alert, a message from a dating site, or football scores… Whatever it is, chances are it came from us. We deliver over 5 billion push notifications per day, at up to 1 million notifications per second from our Rust backend.
Earlier this year we raised a $25M Series B and have been rapidly expanding the team. Our product & engineering team is 20 people now, expanding to 40 over the coming year.
Here's an overview of our tech stack:
Front-end / Full Stack: Typescript, React, CSS Grid, Rails
Database: PostgreSQL, Redis Enterprise, Kafka
Backend & Delivery: Rust, Go, Kubernetes
Data Backend: HDFS, Presto, Airflow
Mobile: We maintain first-party SDKs for all mobile platforms including native iOS, Swift, Android, Flutter, Ionic, Unity3D, and Xamarin.