Associate Principal Scientist, Biologics Process R&D

Job Description

Position Summary

We are seeking a highly motivated and experienced Associate Principal Scientist to join our Cell Line Development group.

The successful candidate will also provide scientific and technical leadership for late-stage biologics programs with a focus on cell line development and cell banking-related regulatory strategy, filing authoring, and health authority response support. The ideal candidate will have strong hands-on and strategic experience with mammalian cell line development, late-stage CMC program support, regulatory filing authoring, and limit of in vitro cell age (LIVCA) studies.

The candidate will be responsible for ensuring that cell line development and cell bank characterization data packages are scientifically sound, and suitable to support global regulatory submissions. This role will serve as a key interface between Cell Line Development, Regulatory CMC, and cross-functional CMC program teams.

Key Responsibilities

• Lead and support cell line development and cell bank characterization activities for late-stage biologics programs.

• Design and execute pre-LIVCA studies, coordinate LIVCA campaigns and generate genetic stability data package to support establishment of control strategy for commercial manufacturing process. Partner with Upstream, Downstream, Analytical and Manufacturing teams.

• Author, review, and provide technical input for CLD-related sections of regulatory submissions, including IND, IMPD, BLA and MAA submissions, and responses to global regulatory agencies.

• Serve as the CLD representative on cross-functional CMC teams and partner closely with Regulatory CMC to develop scientifically robust filing strategies.

• Support responses to health authority questions (RTQs) related to cell line development, cell banking, clonality, genetic stability, LIVCA, and related control strategy topics.

• Author technical reports, source documents, risk assessments, and knowledge management content related to cell line development. Support digitization efforts to streamline authoring and report writing.

• Maintain awareness of relevant regulatory expectations, industry practices, and scientific developments related to cell line development, cell bank characterization, and LIVCA.

Required Qualifications

• Ph.D. in Biology, Cell Biology, Molecular Biology, Biochemistry, Biotechnology, Chemical/Biochemical Engineering, or a related discipline with 4+ years of industry experience; or Master’s degree with 8+ years of industry experience.

• Strong experience in mammalian cell line development, preferably using CHO-based expression systems for therapeutic proteins or monoclonal antibodies.

• Working knowledge of ICH guidelines and regulatory expectations relevant to biotechnology-derived products, cell substrates, cell banking, and genetic stability.

• Demonstrated experience supporting late-stage biologics programs, including pre-LIVCA studies to generate both phenotypic and genotypic stability data packages.

• Experience authoring CLD-related regulatory submissions and supporting responses to health authority questions in collaboration with Regulatory CMC teams and cross-functional CMC development teams.

• Strong scientific writing and communication skills, with the ability to develop clear, accurate, and well-structured technical and regulatory documents.

• Strong understanding of cell line history, clone selection, clonality, cell substrate characterization, cell bank generation & testing, genetic stability, and LIVCA.

• Ability to work independently, manage multiple priorities, and influence cross-functional teams effectively.

Preferred Qualifications

• Experience supporting global regulatory submissions across major markets, including the United States, Europe, Japan and China.

• Experience in upstream commercial process development for biologics programs.

• Hands-on experience with cell line genetic characterization techniques including RNAseq, PCR, Southern and Northern blotting.

• Experience preparing technical source documents, regulatory summaries, RTQs, and agency briefing materials.

• Experience across early and late-stage biologics development, with an ability to connect CLD decisions into long-term regulatory and commercial strategy.

Required Skills:

Biochemistry, Biochemistry, Biotechnology, Cell Line Development, Cell Physiology, Chemical Engineering, Control Strategy, Detail-Oriented, Downstream Process Development, Drug Delivery Technology, Drug Development, Expression Vectors, Interpersonal Relationships, Leading Project Teams, Mammalian Cell, Manufacturing Strategies, Microbiology, Molecular Biology, Monoclonal Antibodies, Pharmaceutical Formulations, Pharmaceutical Process Development, Physical Characterization, Regulatory Submissions, Risk Assessments, Stable Cell Lines {+ 1 more}

Preferred Skills:

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As an Equal Employment Opportunity Employer, we provide equal opportunities to all employees and applicants for employment and prohibit discrimination on the basis of race, color, age, religion, sex, sexual orientation, gender identity, national origin, protected veteran status, disability status, or other applicable legally protected characteristics.  As a federal contractor, we comply with all affirmative action requirements for protected veterans and individuals with disabilities.  For more information about personal rights under the U.S. Equal Opportunity Employment laws, visit:

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The salary range for this role is

$142,400.00 - $224,100.00

This is the lowest to highest salary we in good faith believe we would pay for this role at the time of this posting. An employee’s position within the salary range will be based on several factors including, but not limited to relevant education, qualifications, certifications, experience, skills, geographic location, government requirements, and business or organizational needs.

The successful candidate will be eligible for annual bonus and long-term incentive, if applicable.

We offer a comprehensive package of benefits.  Available benefits include medical, dental, vision healthcare and other insurance benefits (for employee and family), retirement benefits, including 401(k), paid holidays, vacation, and compassionate and sick days. More information about benefits is available at https://jobs.merck.com/us/en/compensation-and-benefits.

You can apply for this role through https://jobs.merck.com/us/en (or via the Workday Jobs Hub if you are a current employee). The application deadline for this position is stated on this posting.

San Francisco Residents Only: We will consider qualified applicants with arrest and conviction records for employment in compliance with the San Francisco Fair Chance Ordinance

Los Angeles Residents Only: We will consider for employment all qualified applicants, including those with criminal histories, in a manner consistent with the requirements of applicable state and local laws, including the City of Los Angeles’ Fair Chance Initiative for Hiring Ordinance

Search Firm Representatives Please Read Carefully 
Merck & Co., Inc., Rahway, NJ, USA, also known as Merck Sharp & Dohme LLC, Rahway, NJ, USA, does not accept unsolicited assistance from search firms for employment opportunities. All CVs / resumes submitted by search firms to any employee at our company without a valid written search agreement in place for this position will be deemed the sole property of our company.  No fee will be paid in the event a candidate is hired by our company as a result of an agency referral where no pre-existing agreement is in place. Where agency agreements are in place, introductions are position specific. Please, no phone calls or emails. 

Employee Status:

Regular

Relocation:

VISA Sponsorship:

Travel Requirements:

Flexible Work Arrangements:

Not Applicable

Shift:

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Hazardous Material(s):

Job Posting End Date:

06/6/2026

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