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Apple · London, United Kingdom

# Principal Machine Learning Engineer, AI & Data Platforms (AiDP)

London, United Kingdom Senior individual contributor Data & Analytics 

Listed on Apple’s official careers site. Posted March 16, 2026. Check that it is still open and apply there.
[Apply on Apple’s careers site →](https://jobs.apple.com/en-us/details/200651188/principal-machine-learning-engineer-ai-data-platforms-aidp)

[OpenNash Jobs](https://jobs.opennash.com/) / [Apple](https://jobs.opennash.com/companies/apple/) / Principal Machine Learning Engineer, AI & Data Platforms (AiDP)

## Job description

At Apple, we build AI systems that define experiences for billions of people and we do it with an unwavering commitment to privacy, performance, and craft. The AI & Data Platforms (AiDP) team is seeking a Principal Machine Learning Engineer to lead the design, fine-tuning, evaluation, and productionisation of large language models and generative internal AI systems at global scale. This is a deeply hands-on, high-impact role: you will work across the full model lifecycle, from reinforcement learning and upstream training through to deployment of standalone, customer-facing products.

The ideal candidate is equal parts researcher, engineer, and product builder. You bring authoritative depth in LLM customisation and alignment, a sharp instinct for performance and quality, and the ability to ship end-to-end AI-powered products that meet Apple's standard of excellence. If you thrive at the intersection of frontier model development, systems engineering, and product creation we want to hear from you.

## At a glance
- Posted by the employer: Mar 16, 2026
- First seen by OpenNash: Jul 10, 2026
- Last checked: Oct 18, 2026
- Listed for: 216 days
- Location: London, United Kingdom[Apply on Apple’s careers site →](https://jobs.apple.com/en-us/details/200651188/principal-machine-learning-engineer-ai-data-platforms-aidp)

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OpenNash lists jobs from employers’ own careers sites and does not handle applications.
Dates come from the employer where stated; “first seen” and “last checked” are our own observations.

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