Apple's Security Engineering & Architecture organization is responsible for the security of all Apple products. When it comes to securing more than a billion devices running the world's most sophisticated operating systems, that means finding vulnerabilities first. Our mission is to discover, understand, and exploit vulnerabilities across all layers of Apple’s platforms, and we believe that ML techniques significantly enhance our ability to do so. We are seeking an Applied Machine Learning Engineer who will help us invent and deliver these new methods and techniques. This position provides rare exposure to a full‑stack view of security along with direct access to expert knowledge, unique datasets, and cross‑domain experience. Join our extraordinary group of security researchers, tool developers, and machine learning experts, and help protect all Apple users.

In this role, you will integrate deeply with security research teams to understand the challenges of analyzing large, complex systems across Apple’s full stack, from custom silicon and microarchitectural elements to boot ROMs, firmware, kernels, system frameworks, web browser and user applications.



You will design and develop AI‑enhanced systems using large language models, agentic workflows and machine learning approaches that complement other analysis methods such as fuzzing, static & dynamic analysis, and manual inspection. Your work will leverage raw data and expert behavior to create practical, scalable approaches to help researchers navigate vast codebases, reason about intricate attack surfaces, and identify subtle weaknesses that are challenging to detect manually. Solid understanding of machine learning algorithms (supervised, unsupervised, and reinforcement learning) and evaluation methods
Strong software engineering and programming skills in languages like Python, C, C++, Swift, Objective‑C
Experience scaling LLM training and fine‑tuning (pretraining, SFT, alignment)
Familiarity with software‑analysis techniques such as fuzzing, static analysis, code‑analysis tooling, reverse engineering, binary‑analysis
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.

📌 Applied Machine Learning Engineer - SEAR (Madrid)
🏢 Apple
📍 Madrid