Senior Principal Scientist, Peptide Chemistry / API Development

Who We Are:

Neurocrine Biosciences is a leading biopharmaceutical company with a simple purpose: to relieve suffering for people with great needs. We are dedicated to discovering, developing and commercializing life-changing treatments for patients with under-addressed neurological, psychiatric, endocrine and immunological disorders. The company's diverse portfolio includes FDA-approved treatments for tardive dyskinesia, chorea associated with Huntington's disease, classic congenital adrenal hyperplasia, hyperphagia in Prader-Willi syndrome, endometriosis* and uterine fibroids*, as well as a robust pipeline including multiple compounds in mid- to late-phase clinical development across our core therapeutic areas. For more than three decades, we have applied our unique insight into neuroscience and the interconnections between brain and body systems to treat complex conditions. We relentlessly pursue medicines to ease the burden of debilitating diseases and disorders, because you deserve brave science. For more information, visit neurocrine.com , and follow the company on LinkedIn , X , Facebook and YouTube . ( *in collaboration with AbbVie )

About the Role:

Lead the peptide chemistry and peptide API development function or major program area, defining scientific strategy and development standards for peptide drug substances from early development through commercialization. This role combines deep expertise in peptide synthesis and process chemistry with strategic CMC leadership to establish robust, scalable, and commercially viable manufacturing approaches. The successful candidate will guide cross-functional and external teams, resolve complex technical challenges, and translate evolving scientific and regulatory expectations into clear development strategies across the peptide portfolio. _

Your Contributions (include, but are not limited to):

Apply highly advanced scientific principles in peptide and organic chemistry to complex, cross-asset API development challenges

Lead teams in applying advanced peptide chemistry and process-development principles across multiple development programs.

Define scientific strategy, governance frameworks, and technical decision standards for peptide API development

Lead development and optimization of peptide manufacturing processes, including solid-phase peptide synthesis (SPPS), liquid-phase peptide synthesis (LPPS), hybrid/fragment approaches, cleavage and deprotection, purification, and drug-substance isolation

Drive scale-up, process transfer, and manufacturing readiness from laboratory scale through clinical, registration, PPQ, and commercial manufacturing

Guide development of robust control strategies by identifying critical quality attributes (CQAs), critical material attributes (CMAs), critical process parameters (CPPs), proven acceptable ranges, and appropriate in-process controls

Lead technical risk assessments, process characterization, robustness studies, and investigations for complex peptide manufacturing processes

Oversee laboratory activities and resource allocation while ensuring high scientific standards, safe operations, and efficient execution

Lead resolution of high-impact technical challenges related to coupling, aggregation, deletion sequences, epimerization, oxidation, cleavage, purification, precipitation, lyophilization, and product stability

Drive innovation in peptide manufacturing technologies to improve product quality, process robustness, sustainability, cycle time, and cost of goods

Develop and manage strategic CDMO and contractor partnerships, including technical evaluation, vendor selection, technology transfer, person-in-plant support, and manufacturing oversight

Provide technical leadership for CMC regulatory documentation and readiness, including development reports, process descriptions, control strategies, regulatory starting-material justification, and responses to health-authority questions

Partner effectively with Analytical Development, Formulation, Quality, Regulatory, Supply Chain, Project Management, Discovery, and other cross-functional teams

Provide leadership, coaching, and scientific mentoring to peptide chemists and technical leads; build capability and scientific excellence within the function

Influence cross-departmental, portfolio-level, and external decisions through clear scientific rationale and strategic communication

Strengthening internal and external scientific networks and representing the organization in technical discussions with CDMOs, consultants, and external experts

Performs other duties as assigned

Requirements:

BS/BA in chemistry, biochemistry, biology, chemical engineering, or similar scientific discipline and 10+ years of relevant experience; OR

MS/MA in chemistry, biochemistry, biology, chemical engineering, or similar scientific discipline and 8+ years of relevant experience; OR

PhD in chemistry, organic chemistry, peptide chemistry, biochemistry, chemical engineering, or similar scientific discipline (or equivalent) and 6+ years of relevant experience

Relevant experience should include substantial hands-on and/or technical leadership experience in peptide synthesis, peptide process development, scale-up, technology transfer, or GMP peptide manufacturing

Industry experience in peptide API process development and/or manufacturing is strongly preferred for this role

Deep expertise in peptide synthesis, including SPPS and/or LPPS; experience with fragment condensation, hybrid approaches, Tag assist peptide synthesis or complex modified peptides is highly desirable

Expertise in peptide cleavage/deprotection, purification by preparative chromatography, and product isolation by precipitation and/or lyophilization

Strong understanding of peptide-related impurities and degradation pathways, including deletion sequences, epimerization, oxidation, deamidation, aggregation, and sequence-dependent challenges

Proven experience in process development, scale-up, technology transfer, and manufacturing of peptide drug substances

Demonstrated knowledge of process characterization, validation, control strategy development, and lifecycle management

Advanced understanding of cGMP, ICH expectations, CMC regulatory requirements, and regulatory starting-material strategy as applied to peptide APIs

Experience overseeing GMP manufacturing and person-in-plant activities at external manufacturing sites

Experience with bioconjugation, lipidation, PEGylation, or other peptide modification technologies is a plus

Ability to lead cross-functional development programs and make sound technical decisions under aggressive timelines

Significant contributor to functional scientific strategy and portfolio-level peptide development decisions

Substantial scientific mastery in peptide chemistry, process chemistry, and pharmaceutical development

Translates regulatory, manufacturing, and business objectives into practical scientific direction

Applies multidisciplinary expertise to complex technical and development challenges

Leads and integrates teams across programs and organizational boundaries

Mentoring scientific talent across levels and builds strong technical capabilities

Excellent written, verbal, analytical, and scientific communication skills

Implements long-term functional strategy while managing high-stakes initiatives and competing priorities

Influences internal and external stakeholders and demonstrates organizational-level thinking

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Neurocrine Biosciences is an EEO/Disability/Vets employer.

We are committed to building a workplace of belonging, respect, and empowerment , and we recognize there are a variety of ways to meet our requirements. We are looking for the best candidate for the job and encourage you to apply even if your experience or qualifications don’t line up to exactly what we have outlined in the job description.