AI Research Scientist (Europe/UK - Remote)

AI Proficiency at Sword Health AI fluency is a core expectation at Sword Health. Every candidate is assessed against our three-level framework — be ready to share real examples of how AI is already part of how you work. Explorer (Level 1) — Uses AI daily to boost personal productivity Builder (Level 2) — Creates workflows and tools that elevate the whole team Integrator (Level 3) — Embeds AI into products and processes at scale Every hire must demonstrate at least Level 1. The expected level will vary depending on the seniority of the role. Design and execute research on LLM fine-tuning, alignment, and post-training methods (SFT, RLHF) tailored for clinical and therapeutic domains; Develop and improve foundational AI models that power our AI agents, spanning language, vision, speech, and multimodal systems; Contribute to the full model development cycle: dataset curation and annotation, architecture design, training, evaluation, and iteration; Collaborate across AI Engineering, Product, and Clinical teams to translate research breakthroughs into production systems that deliver patient care; Work towards long-term ambitious research goals, such as clinical memory, long-horizon planning, and safety validation, while identifying and delivering immediate milestones; Advance the field by publishing in top-tier AI venues and clinical journals, contributing to Sword's growing body of peer-reviewed research. A PhD in Computer Science, Machine Learning, Natural Language Processing, or a closely related AI field; Hands-on experience fine-tuning large language models (pre-training, SFT, RLHF, or related post-training techniques); A strong publication track record in peer-reviewed AI conferences or journals; Proficiency in Python and deep experience with modern ML frameworks (e.g., PyTorch, JAX); Demonstrated ability to design rigorous experiments and interpret their results. First-author publications in top-tier AI conferences (e.g., NeurIPS, ICML, ICLR, ACL, EMNLP, COLM, CVPR); Deep expertise in one or more of: large language models, reinforcement learning from human feedback, multimodal learning (vision, speech), or agentic AI systems; Experience building or contributing to LLM-based agents, including prompt engineering, memory orchestration, or agentic workflows; A track record of taking research ideas from conception to working systems, including developing and debugging complex ML pipelines; Industry experience during or after the PhD (e.g., research internships at leading AI labs); Comfort with ambiguity and a track record of delivering results in fast-moving, high-uncertainty environments where research and product development happen in parallel; Strong communication skills and a history of effective cross-functional collaboration; A broader record of research excellence demonstrated through grants, fellowships, patents, or impactful open-source contributions.