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Walker Cole International is searching for a Senior R&D Scientist - E&L and Nitrosamine Method Development - to join a global pharmaceutical company at their R&D and GMP-regulated site in the UK. As the Senior Scientist, you will play a key role in developing and validating analytical methods to support Extractables, Leachables, and Nitrosamine testing across pharmaceutical products and materials. Your responsibilities will include: Leading and supporting risk assessments and analytical method development for E&L and Nitrosamines. Developing, validating, and transferring LC-MS and GC-MS methods in compliance with GMP and regulatory guidelines. Performing data interpretation, troubleshooting, and technical investigations to resolve analytical issues. Preparing technical reports and regulatory documentation to support product filings and submissions. Collaborating with QC, QA, and Regulatory Affairs teams to ensure analytical compliance and product quality. Contributing to continuous improvement within analytical R&D and supporting method optimisation projects. To be successful, you will have: Proven experience in Extractables & Leachables and/or Nitrosamine analysis within a GMP-regulated laboratory. Hands-on experience with LC-MS or GC-MS and method validation techniques. Strong problem-solving, communication, and documentation skills. Analytical Chemistry Extractables & Leachables Nitrosamines LC-MS GC-MS Method Development Validation GMP Pharmaceuticals R&D