Take part in bringing the best possible Siri to as many users and use cases as possible. As a Sr. Language Expansion Engineer, you’ll have the opportunity to have end-to-end ownership for the development of Siri for multiple locales, from voice, to language, to character you will play a key guiding role. You'll work with engineering partners to develop processes, tools, and frameworks for building fine-tuning/optimizing ML models for TTS text processing and acoustic models of Siri. You'll also build tools for analyzing errors and systemic issues on Siri voices in all locales. Lastly, you'll implement your ideas directly in our TTS engine in production. Hundreds of millions of users will experience your contributions through more natural and expressive Siri on Apple products.