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LC-MS/MS Sr. Scientist

Saint Charles, MO, us💼 Full-time🗓 2026-09-02 → 2026-09-25

Core

Develops and validates LC-MS/MS methods for ADME/DMPK applications in biological matrices, performing production assays and troubleshooting mass spectrometry equipment.

Role type

Senior Individual Contributor Analytical Scientist (LC-MS/MS)

Builds

Production assays and analytical methods for ADME Toxicology Services

Domain

Life Sciences / Contract Research Organization (CRO) / Drug Discovery

Deliverable

production ML models | product features | dashboards & analysis | research | client delivery | infrastructure | physical/clinical work

Required skills

LC-MS/MS method development, ADME/DMPK quantification, mass spectrometry troubleshooting, HPLC operation, bioanalytical method validation, regulatory compliance (FDA/ICH), small team leadership, project management

Preferred skills

Sciex or Waters instrumentation experience, liquid handling automation, solid-phase extraction (SPE), HTS applications, statistical analysis

Technologies

LC-MS, HPLC, Sciex, Waters

Responsibilities

Develop LC-MS methods for ADME/DMPK, troubleshoot and maintain mass spectrometers and HPLC units, prepare and manage inventory of buffers and reagents, perform data and report QC review, support validation of new methods, lead small projects with minimal supervision, train colleagues and external users

Seniority

Senior, hands-on IC with project leadership

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