Global Siri Engineer, English

Lex; Barcelona; On-site; EUR 90,000 - 130,000; Full time

Job summary

Apple's Siri team in Barcelona seeks an engineer with deep ML or software expertise to shape Siri for English-speaking users worldwide. You will contribute to ML/DL models, data experiments, and scalable software that delivers culturally aware experiences across languages and markets.

Whether you are a strong software engineer applying ML to production or an ML expert with coding skills, you will leverage LLMs, agentic approaches, and data generation to build real-world systems for global users.

Qualifications

• Fluent English with UK culture familiarity.
• Experience applying ML/NLP to products, with solid ML concepts.
• Strong software design and production code experience.
• Experience building/curating large datasets and data-driven decisions.

Responsibilities

• Design and implement large-scale ML/GenAI solutions for Siri across markets.
• Lead cross-functional work streams spanning ML, data, and software engineering.
• Collaborate with partner teams across Apple to ensure native feel for English users.

Skills

Professional English fluency

ML & NLP techniques

Software design & programming

Data at scale

Education

MS/PhD in CS or related

Tools

Python

Swift

Objective-C

C++

Apple platforms

Job description

Summary

Play a part in the next revolution of machine learning technology! Siri assists hundreds of millions of people, in dozens of languages, every day, and Global Siri is the team that teaches Siri each one of them.

We own the product end-to-end, from Speech Recognition and Natural Language Understanding through to Response. We are looking for an engineer with deep expertise in either Machine Learning or Software Engineering, and practical working knowledge of the other, to shape the future of Siri for English users.

Your work will range across multiple disciplines, including employing advanced Large Language Models (LLMs), adopting models for global markets, running data experiments, and engineering scalable software to deliver highly personalized, culturally relevant experiences for our customers.

Description

As a member of our dynamic and fast-paced group, you will play a key role in crafting innovative, end-to-end solutions that delight millions of customers across the globe. You will act as the technical anchor for the UK English speaking market, leading work streams to design and implement large-scale ML and GenAI solutions that advance our customer experience.

This position sits squarely at the intersection of Machine Learning, Data, and Software Engineering. Whether you are a strong Software Engineer who has applied ML to production systems, or an ML expert with solid coding skills, you will leverage large language models (LLMs), agentic approaches to tasks, and data generation methods to build real-world systems.

You will work with partner teams across Apple, sharing your expertise and bringing architectural proposals that account for international market nuances, so that Siri feels genuinely native to English users.

Join us as we build the foundation of Siri AI for users around the world!

Minimum Qualifications

• Professional-level fluency in English, with deep familiarity with the culture and idiom of the United Kingdom or other English-speaking regions.
• Experience in applying machine learning and NLP techniques to deliver products, with a solid understanding of ML concepts
• Strong skills in software design and programming across different paradigms, including testing and maintainability, with experience contributing to large production code bases.
• Experience working with data at scale, including building or curating datasets, analyzing results, and making data driven decisions.

Preferred Qualifications

• Hands-on experience with large language models: fine-tuning, prompt and context engineering, evaluation, and inference optimization, including agentic systems, tool calling, or retrieval-augmented generation.
• Experience with speech technologies such as ASR, TTS, or pronunciation modeling.
• Experience adapting models or products across languages and markets — multilingual and cross-lingual modeling, transfer learning, or low-resource settings.
• Ability to formulate a research problem, design, experiment, implement and communicate solutions.
• Product focus with a strong emphasis on end-user experience.
• Experience writing software in Python, Swift, Objective-C, C++ or C; experience on Apple platforms preferred.
• M.S, Ph.D. in Computer Science or a related field, or equivalent practical experience.

At Apple, we’re not all the same. And that’s our greatest strength. We draw on the differences in who we are, what we’ve experienced, and how we think. Because to create products that serve everyone, we believe in including everyone. Therefore, we are committed to treating all applicants fairly and equally. We will work with applicants to make any reasonable accommodations.

At Apple, we believe accessibility is a fundamental human right. You’ll find that idea reflected in everything here — in our culture, our benefits and our digital tools. By welcoming as many perspectives as possible, we help you build a career where you feel like you belong.

Learn about accessibility in Apple’s workplace