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Job Description
United States - California – Oceanside, CA or Foster City, CA
We are seeking a highly motivated and experienced Principal Scientist to join the Biologics Structural Characterization team within Pivotal and Commercial Analytical Development. This role will provide scientific and people leadership for mass spectrometry–based characterization with a primary focus on critical post‑translational modifications (PTMs), intact and subunit mass analysis across a range of late‑stage biologics programs, to support product understanding, control strategy, and regulatory filings from late development through commercialization.
The successful candidate will serve as a technical expert in MS‑based structural characterization, act as a mentor to junior scientists, and bring demonstrated experience in managing and developing MS teams within a regulated CMC environment.
This role is designed to bridge deep MS technical expertise with people leadership, enabling robust PTM, intact and subunit mass characterization in support of late‑stage biologics development and commercialization.
The position will be on-site at Oceanside, CA with a future transfer to Foster City, CA.
Key Responsibilities
Provide scientific and people leadership to a team of scientists focused on extended characterization analysis, for example, PTM characterization, intact and subunit mass analysis for biologics.
Mentor, coach, and develop junior scientists; set clear expectations, performance goals, and scientific standards.
Lead and oversee MS‑based structural characterization strategies, including intact mass, subunit analysis, peptide mapping, and PTM profiling (e.g., oxidation, deamidation, clipping, disulfide integrity, glycation, terminal variants, etc.).
Define and drive late‑stage characterization and control strategies in alignment with CQAs and product quality targets.
Serve as an analytical project lead (ASTL) or senior analytical representative for late‑phase programs, ensuring timely delivery of high‑quality characterization data.
Author and review CMC sections for IND, BLA, and post‑approval submissions, and support interactions with global health authorities.
Partner cross‑functionally with Process Development, Quality, Manufacturing, CMC Regulatory Affairs, Technical Development, and Supply Chain to support commercialization and lifecycle management.
Drive adoption of state‑of‑the‑art MS technologies and workflows, including high‑resolution MS, native MS, multi‑attribute methods (MAM), and data‑driven characterization approaches.
Ensure compliance with GMP, data integrity, and CMC regulatory expectations.
Contribute as a member of the extended Analytical Development leadership team, influencing strategy, resourcing, and capability building.
Qualifications
Ph.D. with 8+ years or M.S. with 10+ years of industry experience in Analytical Chemistry, Biochemistry, or related fields, with significant experience in biologics structural characterization.
Deep expertise in mass spectrometry, particularly intact mass analysis, peptide mapping, and PTM characterization for biologics.
At least three years of experience leading and managing MS teams, including mentoring, hiring, and performance development.
Strong understanding of CMC, CQAs, comparability, specifications, and control strategies for late‑stage biologics.
Proven track record of mass spectrometry expertise, including PTM and intact mass characterization, with demonstrated scientific impact through publications, internal innovations, or program support.
Experience with relevant techniques may include (but is not limited to): high‑resolution LC‑MS, intact and subunit analysis, peptide mapping, MAM, SEC‑MS, IEX‑MS, RP‑LC, native MS, and complementary biophysical methods.
Solid knowledge of FDA, EMA, and ICH guidelines related to biologics development and commercialization.
Strong collaboration, communication, and stakeholder‑management skills in a cross‑functional environment.
Strong business acumen, with ability to balance resource, budget, and program milestones.
Create Inclusion - knowing the business value of diverse teams, modelling inclusion and embedding the value of diversity in the way they manage their teams.
Develop Talent - understand the skills, experience, aspirations and potential of their employees and coach them on current performance and future potential. They ensure employees receive feedback and insight needed to grow, develop and realize their purpose.
Empower Teams - connect the team to the organization by aligning goals, purpose, organizational objectives and holding to account. They provide the support needed to remove barriers and connect their team to the broader ecosystem.
Leadership Competencies
Develop Talent: Actively mentor and grow scientific talent; provide timely feedback and career guidance.
Build High‑Performing Teams: Foster accountability, inclusion, and collaboration.
Strategic Mindset: Translate scientific insights into CMC and business impact.
Executive Presence: Communicate complex technical concepts clearly to diverse audiences.
For additional benefits information, visit:
https://www.gilead.com/careers/compensation-benefits-and-wellbeing
* Eligible employees may participate in benefit plans, subject to the terms and conditions of the applicable plans.
Gilead Sciences Inc. is committed to providing equal employment opportunities to all employees and applicants for employment, and is dedicated to fostering an inclusive work environment comprised of diverse perspectives, backgrounds, and experiences. Employment decisions regarding recruitment and selection will be made without discrimination based on race, color, religion, national origin, sex, age, sexual orientation, physical or mental disability, genetic information or characteristic, gender identity and expression, veteran status, or other non-job related characteristics or other prohibited grounds specified in applicable federal, state and local laws. In order to ensure reasonable accommodation for individuals protected by Section 503 of the Rehabilitation Act of 1973, the Vietnam Era Veterans' Readjustment Act of 1974, and Title I of the Americans with Disabilities Act of 1990, applicants who require accommodation in the job application process may contact ApplicantAccommodations@gilead.com for assistance.
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