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28 applied research scientist jobs at 8 companies in Fullerton, CA

1mo
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Applied Research Scientist - Trust and Safety
Los Angeles or Singapore or New York City or London or Dublin or Paris or Berlin or Dubai or Jakarta or Seoul or Tokyo
$219k-$408k/yr OnsiteFull Time
TikTok
TikTok: Global short-form video hosting and social media platform.
5+ YOE5+ years applied research experience with strong quantitative and qualitative methods, experimentation, causal inference, and ability to translate findings into policy and product recommendations.
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6d
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Sr. Applied Scientist, AGI
Sunnyvale or San Francisco or Los Angeles County
$192k-$260k/yr OnsiteFull Time
Amazon
AmazonNASDAQ: AMZN: Global online retail and cloud computing technology provider.
3+ YOERequires 3+ years building machine learning models, large-scale ML systems experience, a PhD or master's degree with 6+ years applied research, and Java, C++, or Python programming.
Java, C++, Python, Large Language Models (LLMs), Generative Artificial Intelligence (GenAI), RL Gyms
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Research Scientist
Pasadena or United States
$100k-$135k/yr RemoteFull Time
Carbon Mapper
Carbon Mapper: Detects and quantifies greenhouse gas emissions using satellite technology.
Graduate degree in physical/environmental/earth/applied sciences, experience with methane emission sectors and remote sensing, ability to work independently and manage multiple projects.
Git
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2mo
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Scientist - Applied Laser Physics
Foothill Ranch, California, United States
$115k-$155k/yr OnsiteFull Time
TAE Technologies
TAE Technologies: Developing commercial fusion energy and advanced power management technologies.
PhD in Physics/Applied Physics/Optical Engineering required; established experience with optical diagnostics and laser systems in plasma or accelerator environments; expertise in interferometry and Thomson scattering; strong mentoring and data-interpretation skills.
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2w
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AI Research Scientist, Learning & Evaluation
Beverly Hills, California, United States
$180k-$280k/yr OnsiteFull Time
StudyFetch
StudyFetch: AI-powered platform providing interactive study tools for students.
5+ YOEPhD or equivalent with 5+ years applying quantitative methods to products, experience evaluating LLMs, experimental design, causal inference, strong communication and analytics skills.
Python, Pandas, NumPy, SciPy, Jupyter, SQL, MongoDB, PostgreSQL, GCP
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5d
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2027 Principal Research Scientist - Directed Energy and Thermal Physics - Manhattan Beach CA
Manhattan Beach, California, United States
$114k-$171k/yr OnsiteFull Time
Northrop Grumman
Northrop GrummanNYSE: NOC: Develops and manufactures advanced aerospace, defense, and space systems.
Completing or completed a PhD in applied physics, materials science, electrical engineering, thermal physics, or related field; U.S. citizenship and eligibility for government clearance required.
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1mo
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Jr. Data Scientist, Business Analytics & Research
Universal City, California, United States
$70k-$85k/yr HybridFull Time
NBCUniversal
NBCUniversalNASDAQ: CMCSA: Produces and distributes entertainment content and theme park experiences.
2+ YOEBachelor's in a quantitative field,2+ years applying quantitative analysis,proficiency in SQL and Python or R,statistical modeling knowledge,experience with Tableau or Power BI,Microsoft Excel and PowerPoint.
SQL, Python, R, Tableau, Power BI, Microsoft Excel, Microsoft PowerPoint
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1w
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Assistant Project Scientist in MRI and Image Processing 2026
Irvine, California, United States
$79k-$101k/yr OnsiteFull Time
University of California
University of California: A public research university system providing education and healthcare.
PhD in engineering, medical physics, computer science, applied mathematics, or related field; experience in MRI, image processing, medical imaging, deep learning, and high-impact publications required.
MRI, Python, C++, CUDA, Siemens, Philips
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