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OneSignal is used by over 80,000 developers to send mobile and desktop notifications to 1.4 Billion end-user devices.

Our free notification service powers a powerful data platform that helps marketers and researchers better understand mobile users to create more effective advertising campaigns.

We’re backed by investors including YCombinator, Justin Kan, SV Angel, and Rakuten Ventures.

Our stack includes Ruby, Rails, Rspec, Javascript ES6, PostgreSQL, Redis, and Rust. Our blazing-fast backend system send hundreds of millions of notifications per day and processes 10,000 API requests per second. Our Rust-based notification delivery server might be the world's fastest (read about it here).

Our extraordinary growth has been a direct result of our experienced and passionate team. We love solving difficult problems, scaling our services efficiently, and providing a great product for our clients. We’re currently on the lookout for several additional engineering roles to join our team of 9.

Current Openings