[Remote] Principal Machine Learning Engineer- LLM Fine-tuning and Optimization

Note: The job is a remote job and is open to candidates in USA. Airbnb, founded in 2007, has grown into a global leader in travel and hospitality, connecting millions of hosts and guests. They are seeking a Principal Machine Learning Engineer to lead the fine-tuning and optimization of large language models (LLMs) for various applications, collaborating with cross-functional teams to develop impactful AI products.ResponsibilitiesWork with large scale structured and unstructured data; explore, experiment, build and continuously improve foundation models for Airbnb product, business and operational use casesCreate a multi-year tech roadmap that enables our team to stay on the leading edge of the rapidly evolving AI landscape and leverage the best in class technologies to deliver customer benefitsContinuously evaluate recent and upcoming large foundational models, ensuring the selection and refinement of the highest quality models for enhanced performance and efficiencyHands-on prototype, develop and productionize LLM models and pipelines at scale, including both batch and real-time use casesDrive key AI architectural decisions for products, and contribute to Airbnb’s ML platform architecture and strategySkillsPhD in Computer Science, Machine Learning, Mathematics, Statistics, or related technical field10+ years of experience with developing machine learning models and products at scale from inception to business impactProgramming experience in Python and hands-on experience with frameworks such as PyTorchProven record of training, fine tuning, optimizing models and inference run-timePost-training experience in areas like data processing for fine-tuning; responsible LLMs; LLM alignment; reinforcement learning; efficient training and inference; language model evaluation; and/or multilingual and multimodal modelingOr specialized experience in runtime optimizations, model quantization, compression, on-device inference, GPU inference, pytorch, kernel developmentPhD in AI, machine learning, data science, or related technical fieldsPublications at peer-reviewed AI conferences (e.g., NeurIPS, CVPR, ICML, ICLR, ICCV, and ACL)Customer Support Systems: Experience with AI technologies in customer support applicationsAgile Practice for AI production: Experience with the entire AI product development lifecycle from incubation to production at scale, following agile practices in the Applied AI/ML domainInfrastructure Acumen: Experience deploying and scaling business-critical AI services and driving architectural requirements on ML infrastructuresBenefitsBonusEquityBenefitsEmployee Travel CreditsCompany OverviewAirbnb is an online community marketplace for people to list, discover, and book accommodations through mobile phones or the Internet. It was founded in 2008, and is headquartered in San Francisco, California, USA, with a workforce of 5001-10000 employees. Its website is https://www.airbnb.com.Company H1B SponsorshipAirbnb has a track record of offering H1B sponsorships, with 27 in 2026, 234 in 2025, 176 in 2024, 160 in 2023, 270 in 2022, 250 in 2021, 274 in 2020. Please note that this does not guarantee sponsorship for this specific role.