Seeking LC-MS Senior Chemist with strong theoretical knowledge of quantitative and qualitative LC-MS analyses and sample preparation experience for large molecules (peptides, proteins and nucleotides). Responsibilities include routine analysis of pharmaceutical samples, maintenance of laboratory equipment (including LC-MS), and method development (e.g., peptide mapping, intact mass analysis, reduced mass analysis, amino acid analysis, protein sequencing, N-glycan analysis, UV assay, HPLC purity). Familiarity with cGMP laboratory guidelines preferred. 5+ years relevant experience with BS or MS, or PhD with 2+ years post-graduate work experience required.