{"@context":"https://schema.org","@type":"JobPosting","title":"Machine Research Engineer (RLHF, Multimodal) – San Francisco","description":"

Machine Learning Research Engineer

Location: San Francisco (on-site)

Compensation: $200K–$350K + equity

Visa sponsorship available

A stealth AI startup is building technology that teaches models what great feels like — across writing, design, and creative expression.

They’re hiring a Machine Learning Research Engineer to design and run experiments that shape how models learn taste, tone, and quality. You’ll focus on post-training, reward modeling, and multimodal research, collaborating with creative experts and AI labs on frontier model behavior.

What you’ll do

Run post-training and fine-tuning experiments (RLHF, DPO, SFT).
Develop benchmarks and evaluations for subjective model outputs.
Train reward models, classifiers, and verifiers for tone and style.
Prototype and test multimodal architectures (text, vision, design).
Work closely with researchers, engineers, and creative collaborators.

You might be a fit if

2+ years in ML research or engineering, especially post-training or alignment.
Hands-on with LLMs or multimodal models (text + image).
Strong in Python, PyTorch, and experimental research cycles.
Experience at a startup or small research team.
Creative, curious, and interested in how AI learns taste and aesthetics.

If you want to help define how AI understands creativity, emotion, and style — this is the kind of research role that sets the standard.

","datePosted":"2025-11-06T09:01:10.329796+00:00","validThrough":"2025-12-06T09:01:07.801+00:00","employmentType":"FULL_TIME","identifier":{"@type":"PropertyValue","name":"Benchstack Ai","value":"aa2102af-9f77-4b68-8959-b73be894dc03"},"hiringOrganization":{"@type":"Organization","name":"Benchstack Ai","sameAs":null,"logo":"https://jeorvdjgxlatuthhpoqi.supabase.co/storage/v1/object/public/org-assets/96/jobs/iLLSoP4E.jpg"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","streetAddress":"San Francisco, CA","addressCountry":"US"}},"baseSalary":{"@type":"MonetaryAmount","currency":"USD","value":{"@type":"QuantitativeValue","minValue":200,"maxValue":350,"unitText":"YEAR"}}}

Machine Research Engineer (RLHF, Multimodal) – San Francisco

Job Type