Senior/Principal Scientist, Analytical Cell Line Engineering and Bioassay Development

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As a senior technical expert within the function, you will apply deep scientific expertise in analytical cell line engineering and bioassay development to anticipate technical challenges, recommend improvements, and provide consultative guidance across programs. You will operate independently, lead complex technical workstreams, mentor colleagues, and contribute to technical standards, regulatory-ready documentation, and capability development within Analytical Development and Quality Control Biologics.  About the role: You will report to the Associate Director, Analytical Cell Line Engineering and Bioassay Development, within the Analytical Development and Quality Control (Biologics) team. You will design, generate, characterize, and manage analytical cell lines that serve as critical reagents for potency assay development, functional characterization, and analytical control strategy. Operating at the interface between Discovery, Global Biologics, Analytical Development, and late-stage potency teams, this role translates product mechanism of action into scientifically sound, phase-appropriate cell line and assay strategies. You will lead complex technical workstreams, solve scientific problems, contribute to regulatory documentation, and help establish scalable approaches for analytical cell line engineering and bioassay development. At the Principal Scientist level, you will serve as a subject matter expert, influence cross-program strategy, and contribute to technical standards and capability development. This is an individual contributor technical leadership role with responsibility for mentoring junior scientists and leading technical work across programs.  How you will contribute: Lead the design, generation, characterization, and lifecycle management of stable mammalian analytical cell lines expressing targets of interest, receptor systems, or reporter constructs to support potency and functional bioassays.  Develop and implement technical approaches for plasmid and vector design, transfection or transduction, stable integration, clone screening, clonal isolation, genomic and copy number characterization, expression stability, and analytical cell banking.  Translate product mechanism of action into cell line designs and cell-based assay concepts aligned with potency and analytical control strategy.  Develop and support cell-based bioassays, including reporter gene assays, signaling pathway assays, proliferation or cytotoxicity assays, and other mechanism-based functional readouts.  Contribute to early-stage potency assay development and ensure effective technical continuity with late-stage potency, validation, transfer, and QC implementation strategies.  Evaluate assay and cell line performance attributes, including sensitivity, specificity, robustness, stability, reproducibility, and fitness for intended use.  Independently design and execute complex experimental plans, interpret data, identify technical risks, and recommend scientifically justified solutions.  Represent Analytical Development on cross-functional program teams and provide technical input on potency strategy, functional characterization, cell line suitability, and control strategy.  Author and review technical reports, protocols, method documents, cell line characterization packages, technology transfer documents, and CMC source documentation supporting regulatory submissions.  Ensure that analytical cell line generation, assay development, documentation, and data packages are aligned with applicable quality and compliance expectations, good documentation practices, and data integrity principles.  Lead or contribute to technical transfers to internal laboratories, external partners, vendors, or quality control functions, providing the technical rationale and knowledge needed for transfer.  Identify opportunities to improve workflows, increase assay robustness, reduce development timelines, and establish platform or semi-platform approaches where scientifically appropriate.  Mentor junior scientists and associates through technical guidance, experimental design review, data interpretation, and development of scientific judgment.  For Principal Scientist level, establish technical standards, influence cross-program strategy, lead complex scientific initiatives, and serve as a recognized subject matter expert in analytical cell line engineering and bioassay development.  What you bring to Takeda: Ph.D. in Cell Biology, Molecular Biology, Bioengineering, Biochemistry, Immunology, or a related discipline with relevant industry experience in biologics analytical development, bioassay development, cell line engineering, or functional characterization.  Senior Scientist level: typically, a doctoral degree with 3+ years, a master’s degree with 9+ years, or a bachelor’s degree with 11+ years of relevant industry experience.  Principal Scientist level: typically, a doctoral degree with 7+ years, a master’s degree with 13+ years, or a bachelor’s degree with 15+ years of relevant industry experience.  Deep technical expertise in stable mammalian cell line engineering, including vector design, transfection or transduction, clonal isolation, clone sc