Principal Machine Learning Engineer (AI)

Location: US - Remote

Salary: $180K–$200K plus $290K–$330K equity

Company

Hims & Hers is a public health and wellness platform delivering personalized diagnosis, treatment, and care access, including AI-powered healthcare solutions.

What you will do

• Define the architectural vision for ML and LLM systems supporting treatment recommendations, personalization, and intelligent care delivery at scale.
• Establish scalable, resilient, secure, and maintainable design patterns and infrastructure practices.
• Prototype and optimize complex model pipelines and platform components using Python and ML frameworks such as PyTorch.
• Architect ML infrastructure for continuous training, real-time inference, evaluation, and observability.
• Partner with platform, product, and clinical teams on high-impact technical decisions and long-term product strategy.
• Lead cross-functional initiatives, define quality standards, and mentor senior and staff engineers across squads.

Requirements

• 10+ years of experience in machine learning and/or engineering, including technical leadership and system architecture across teams or business areas.
• Expert-level Python proficiency and advanced ML framework experience with PyTorch or TensorFlow.
• Experience designing, scaling, and evolving production-grade ML platforms for training, deployment, real-time inference, and monitoring.
• Deep experience with LLMs and NLP, including transformer models, summarization, conversational agents, and embedding-based retrieval.
• Advanced knowledge of ML infrastructure, continuous training, observability, performance optimization, and platform reliability.
• Experience with Databricks, MLflow, SageMaker, or equivalent ML infrastructure tools.
• Exceptional communication and cross-organizational leadership skills, with the ability to align technical and non-technical stakeholders around ML strategy and architecture.

Nice to have

• Master’s degree or PhD in Computer Science, Machine Learning, or a related field; not strictly required.

Culture & Benefits

• Full-time employment with competitive salary and equity compensation.
• Unlimited PTO, company holidays, and quarterly mental health days.
• Medical, dental, and vision coverage, parental leave, and a 401(k) with employer matching.
• Employee Stock Purchase Program.
• Offsite team retreats and a culture focused on ethics, wellness, belonging, sustainable speed, system ownership, and architectural clarity.