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Principal Machine Learning Engineer

Yahoo

$143,625 - $299,375
Oct 16, 2025
Remote, US
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Yahoo Mail is looking to enhance its consumer inbox with hundreds of millions of users by developing scalable, intelligent capabilities that uncover user interests, reveal habits, and personalize journeys within Yahoo Mail and the broader Yahoo ecosystem. This involves leveraging cutting-edge algorithms, including natural language processing, generative AI, large language models, and machine learning, to process billions of mail messages and extract information, build mail content, enhance user knowledge, and connect diverse data sources to highlight and amplify key insights.

Requirements

  • Proficient in programming languages such as Python or Java and machine learning frameworks like TensorFlow, PyTorch, and Scikit-learn.
  • Skilled with AI tools such as Cursor, Copilot, and Claude.
  • Advanced AI skills, including experience with AI development tools and frameworks.
  • Expertise in Python, Java, or C++ and machine learning frameworks like TensorFlow, PyTorch, and Scikit-learn.
  • Proficient in big data technologies (Hadoop, Spark) and modern ML infrastructure (Airflow, MLFlow, feature stores, vector databases, CI/CD for ML).
  • Hands-on experience with LLMs, generative AI (prompt engineering, Agent frameworks, fine-tuning, RAG, LLMOps), and GPU optimizations.
  • Solid understanding of machine learning algorithms, natural language processing, and data mining techniques.

Responsibilities

  • Support the development of AI/ML capabilities that enhance user personalization and insights within Yahoo Mail and the broader Yahoo ecosystem.
  • Assist in building scalable AI/ML solutions that identify user interests and habits, contributing to personalized user experiences.
  • Apply machine learning techniques and big data processing to derive insights from mail data, enhancing content and user knowledge.
  • Develop AI/ML tools and workflows to manage and utilize large datasets, supporting AI-based infrastructure and analytics.
  • Run regular A/B tests, gather data, and draw conclusions on the impact of your models.
  • Maintain high engineering standards, focusing on code quality and architectural skills, while delivering optimal user experiences.
  • Implement feedback loops and recovery paths to handle AI failures gracefully, ensuring user satisfaction.

Other

  • Guide and mentor a team of passionate engineers, fostering a culture of innovation and excellence.
  • Work with cross-functional teams to integrate new AI/ML features and improve existing platforms, ensuring smooth user interactions.
  • You possess strong analytical skills and a knack for solving complex problems using data-driven approaches.
  • You are a team player who can work effectively with cross-functional teams, including tech leads and architects, to deliver high-quality solutions.
  • You are enthusiastic about leveraging AI/ML to drive innovation and enhance user experiences across Yahoo Mail and the broader ecosystem.