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69 senior scientist jobs at 36 companies in Saint Charles, MO

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Senior Scientist
St. Louis, Missouri, United States
$106k-$158k/yr OnsiteFull Time
MilliporeSigma
MilliporeSigma: Merck KGaA's U.S./Canada life science business supplies research tools, bioprocessing products, and services to scientists and drugmakers.
5+ YOERequires a chemistry-related BS with 5–7+ years, master's with 3–5+ years, or PhD with 0–1+ years; advanced LC-MS, biomolecule sample preparation, and collaborative communication skills.
LC-MS, Multiple Reaction Monitoring (MRM), Parallel Reaction Monitoring (PRM), UNIFI, BioPharma Finder, Mascot, Scaffold, Thermo, Sciex, Waters, Agilent, MALDI-MS
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Senior Scientist
St. Louis, Missouri, United States
$106k-$158k/yr OnsiteFull Time
MilliporeSigma
MilliporeSigma: Merck KGaA's U.S./Canada life science business supplies research tools, bioprocessing products, and services to scientists and drugmakers.
5+ YOERequires chemistry-related BS with 5–7+ years, master's with 3–5+ years, or PhD with 0–1+ years; advanced LC-MS experience, biomolecule sample preparation, and independent and team communication skills.
LC-MS, Multiple Reaction Monitoring (MRM), Parallel Reaction Monitoring (PRM), UNIFI, BioPharma Finder, Mascot, Scaffold, Thermo, Sciex, Waters, Agilent, MALDI-MS
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1mo
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Senior Scientist
Lenexa or Topeka or Manhattan or Wichita or Columbia or Saint Louis
OnsiteFull Time
Terracon
Terracon: Employee-owned consulting engineering firm providing multidisciplinary technical services.
8+ YOEBachelor's or Master's in environmental science/geology,8+ years environmental consulting experience focused on building sciences,project management and technical assessment skills,valid driver's license,and willingness to travel for field work.
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Senior Data Scientist
St. Louis, Missouri, United States
OnsiteFull Time
GRVTY
GRVTY: Defense technology firm delivering automated intelligence and mission support.
Active TS/SCI clearance, senior-level Python and data science experience supporting intelligence missions, scalable data pipeline and visualization skills, ability to operate independently and lead technical initiatives.
Python, JEMA, Brewlytics, ArcGIS ModelBuilder
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Data Scientist, Senior
St. Louis, Missouri, United States
$120k-$150k/yr OnsiteFull Time
Chopine Analytic Solutions
Chopine Analytic Solutions: Woman- and veteran-owned small business providing mission-support and technical services to U.S. intelligence and defense customers.
TS/SCI clearance required (CI/Poly obtainable), intelligence analysis experience, senior-level Python scripting, designing scalable processes for large datasets, creating visualizations, and managing multiple projects.
Python, JEMA, Brewlytics, ArcModel Builder
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Senior Scientist
St. Louis, Missouri, United States
$106k-$158k/yr OnsiteFull Time
MilliporeSigma
MilliporeSigma: Merck KGaA's U.S./Canada life science business supplies research tools, bioprocessing products, and services to scientists and drugmakers.
0+ YOERequires chemistry degree and 0–7+ years of relevant experience depending on education, advanced LC-MS instrumentation, biomolecule sample preparation, and effective independent and team communication.
LC-MS, Multiple Reaction Monitoring (MRM), Parallel Reaction Monitoring (PRM), UNIFI, BioPharma Finder, Mascot, ScaffoldPro, Thermo, Sciex, Waters, Agilent, MALDI-MS
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2mo
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Formulation & Process Development Senior Scientist
Bridgeton, Missouri, United States
OnsiteFull Time
Virbac
VirbacEuronext Paris: VIRP: Independent French animal-health pharmaceutical developing veterinary medicines for veterinarians, farmers, and pet owners worldwide.
5+ YOEBS in chemistry/pharmaceutical science/chemical engineering or higher; 5+ years pharmaceutical experience desired; expertise in formulation and process development, DOE/QbD, cGMP/GLP/GCP, technology transfer, stability testing, and mentoring junior scientists.
Quality by Design (QbD), Design of Experiments (DOE)
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Senior Analytical Scientist
St. Louis, Missouri, United States
$76k-$114k/yr OnsiteFull Time
MilliporeSigma
MilliporeSigma: Merck KGaA's U.S./Canada life science business supplies research tools, bioprocessing products, and services to scientists and drugmakers.
1+ YOEBachelor's degree plus 6+ years, master's plus 2+ years, or PhD plus 1+ years of research in chemistry, biochemistry, biomedical engineering, chemical engineering, life science, or engineering. Analytical development expertise required.
ELISA, SPR, Isoelectric Focusing, CE, UV-Vis, HPLC, GC, IC, UPLC, SEC, HILIC, Microsoft Word, Microsoft Excel, Microsoft PowerPoint
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Senior Data Scientist
New York City or Milwaukee or Dallas or Columbus or Kirkland or Cincinnati or Cleveland or Oklahoma City or Austin or Albany or Chicago or St. Petersburg or Hartford or Pittsburgh or St. Louis or Miami or Sacramento or Raleigh or Minneapolis or Mountain View or Scottsdale or San Francisco or Morristown or Denver or Boston or Philadelphia or Des Moines or Overland Park or Los Angeles or Charlotte or Walnut Creek or Carmel or Seattle or Houston or Arlington or Atlanta or Redmond or Bentonville or Beaverton or Nashville or Detroit or San Diego
$87k-$294k/yr HybridFull Time
Accenture
AccentureNYSE: ACN: Global professional services delivering 360° value.
6+ YOE6+ years in data science, AI, analytics, Responsible AI, or consulting; bachelor's or master's in a quantitative field; Python, SQL, machine learning, generative AI, governance, and client leadership experience.
Python, pandas, NumPy, scikit-learn, PyTorch, TensorFlow, XGBoost, SQL, MLOps, GenAIOps, LLMOps, AWS, Microsoft Azure, Google Cloud
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Senior Data Scientist
Denver or Springfield or Sterling or St. Louis
$82k-$172k/yr OnsiteFull Time
CACI
CACINYSE: CACI: Provider of specialized IT and mission-critical government services.
8+ YOETS/SCI clearance with polygraph, Bachelor or equivalent, 8+ years experience, expert Python/R and SQL, ML production experience, data visualization, and geospatial experience preferred.
Python, R, SQL
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2mo
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Senior Formulation Scientist
Bridgeton, Missouri, United States
OnsiteFull Time
Balchem Corporation
Balchem CorporationNASDAQ: BCPC: Public U.S. manufacturer of specialty ingredients for nutrition, food, pharmaceutical, animal-health, plant-nutrition, and industrial markets.
5+ YOEBachelor's in food science or related with 10+ years or Master's with 5+ years; hands-on formulation and scale-up experience in beverages/frozen desserts/confections; UHT/HTST experience preferred; MS Office proficiency; strong problem solving and communication.
Microsoft Excel, Microsoft Word, Microsoft PowerPoint, Microsoft Outlook
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1mo
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Senior Data Scientist
Denver or St. Louis or Sterling or Springfield
$82k-$172k/yr OnsiteFull Time
CACI
CACINYSE: CACI: Provider of specialized IT and mission-critical government services.
8+ YOEBachelor's in related field,8+ years data science experience,expert Python or R,SQL proficiency,production ML deployment experience,and TS/SCI clearance with polygraph willingness.
Python, R, SQL
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Senior AI Scientist
Tempe or St. Louis
HybridFull Time
Edward Jones
Edward Jones: Financial services firm providing wealth management and investment advice.
9+ YOERequires 9+ years delivering applied data science solutions, an MS in a quantitative field, Python, statistical modeling, and expertise in at least two of ML, AI, GenAI, optimization, or agentic systems.
Python, SQL, Git, CI/CD, Databricks
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Senior Data Scientist
Hazelwood, Missouri, United States
$162k-$220k/yr OnsiteFull Time
Boeing
BoeingNYSE: BA: Global aerospace manufacturer of commercial and defense aircraft.
9+ YOEBachelor's in relevant field,9 years data science experience,active U.S. Secret security clearance,programming in Python/Julia/R/C/C++/C#/Java,team leadership,EMR not mentioned,technical assessment required.
Python, Julia, R, C, C++, C#, Java, SQL, NoSQL, PyTorch, TensorFlow, ClearML, MLFlow, Azure, AWS, LLMs
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Senior Data Scientist
Hazelwood or St. Louis
$162k-$220k/yr OnsiteFull Time
Boeing
BoeingNYSE: BA: Global aerospace manufacturer of commercial and defense aircraft.
9+ YOEBachelor's degree in a related technical field, 9 years of data science, AI, or machine learning experience, programming skills, technical leadership experience, and active U.S. Secret clearance with U.S. citizenship.
Python, Julia, R, C, C++, C#, Java, SQL, NoSQL, PyTorch, TensorFlow, ClearML, MLFlow, Azure, AWS
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Senior Data Scientist
Hazelwood, Missouri, United States
OnsiteFull Time
Boeing
BoeingNYSE: BA: Global aerospace manufacturer of commercial and defense aircraft.
9+ YOEActive U.S. Secret clearance, Bachelor’s degree or equivalent,9 years data science experience, programming in Python/Julia/R/C/C++/C#/Java, experience leading teams, onsite at Hazelwood, up to 10% travel.
Python, Julia, R, C, C++, C#, Java, SQL, NoSQL, PyTorch, TensorFlow, ClearML, MLFlow, Azure, AWS
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1mo
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Senior Data Scientist
Saint Louis, Missouri, United States
$117k-$151k/yr HybridFull Time
Safety National
Safety National: Specialty insurance and reinsurance provider serving commercial, public-entity, and self-insured customers nationwide.
6+ YOEMaster's in a quantitative field, 6+ years data science experience, proficiency with Python or R, ML libraries, advanced SQL, Microsoft SQL Server and Snowflake experience, strong communication; U.S. work authorization required.
Python, R, Scikit-Learn, XGBoost, TensorFlow, PyTorch, Microsoft SQL Server, Snowflake, SQL
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2mo
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Senior Data Scientist
St. Louis, Missouri, United States
OnsiteFull Time
Tiger Analytics
Tiger Analytics: We provide certainty by solving your toughest challenges.
8+ YOE8 years data science/ML experience; hands-on Python and SQL; experience with A/B testing, causal ML/matching models/AutoML; strong statistical knowledge, problem-solving, and stakeholder communication.
Python, SQL, AutoML
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2mo
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Senior AI Scientist
Arizona or Tempe or Missouri or St. Louis or United States
HybridFull Time
Edward Jones
Edward Jones: Financial services firm providing wealth management and investment advice.
9+ YOE9+ years applied data science experience; MS required (PhD preferred) in a quantitative field; strong Python, SQL, Git, Databricks, CI/CD experience; expertise in statistical modeling, ML/GenAI/optimization; productionizing models and influencing stakeholders.
Python, SQL, Git, Databricks, CI/CD
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Senior Scientist - Neurology
St. Louis, Missouri, United States
$63k-$115k/yr OnsiteFull Time
Washington University School of Medicine
Washington University School of Medicine: Private nonprofit research university in St. Louis providing undergraduate, graduate, professional, medical education, research and patient care.
3+ YOEPhD or terminal degree (or equivalent), ~3 years postdoctoral experience, expertise in cellular/molecular/neurodegeneration techniques, mentoring, grant and manuscript contributions, and laboratory safety compliance.
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