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OneSignal | San Mateo | Full-time / Onsite | Distributed Systems Architect, Full Stack Engineer, Site Reliability Engineer (SRE), Mobile Developer, Data Engineer, Product Manager | https://onesignal.com/careers 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.