Principal Scientist, Long-Acting Injectable Sterile Product Development

MSD


Job Location:

Rahway, NJ - USA

Monthly Salary: $ 173200 - 272600
Posted on: 3 days ago
Vacancies: 1 Vacancy

Job Summary

Job Description

The Sterile Product Development group is responsible for the development of parenteral dosage forms including long-acting injectables (LAIs) across small molecules peptides and biologics from preclinical development through commercialization. Our teams enable robust and scalable drug product and delivery solutions through deep scientific understanding of formulation drugexcipient interactions delivery system performance and manufacturing processes ensuring product quality safety efficacy and patient-centric design.

This role is a Principal Scientistlevel technical leadership position with a primary focus on long-acting injectable drug products including depot formulations extended-release systems and injectable sustained-delivery technologies. The successful candidate will serve as a scientific leader across multidisciplinary teams shaping LAI formulation and development strategy across the portfolio.

Primary Duties

  • Serve as a principal-level LAI formulation scientist providing scientific leadership for the design development and lifecycle management of long-acting injectable drug products including depot sustained-release and controlled-delivery parenteral dosage forms

  • Lead LAI formulation and delivery strategy development including selection and optimization of release mechanisms (e.g. polymer-based depots suspensions microspheres in situ forming systems) excipient systems and delivery approaches to meet target product profiles

  • Provide strategic technical leadership on cross-functional program teams ensuring alignment of formulation drug substance properties delivery system performance

  • container/closure systems manufacturability and clinical use considerations throughout development

  • Design and interpret studies to understand and control release kinetics stability and performance including:

  • Drugexcipient and drugpolymer interactions

  • In vitro and in vivo performance relationships

  • Physical stability aggregation and particle size control

  • Syringeability injectability and device compatibility

  • Support early- and late-stage development programs including:

  • Selection of scalable manufacturing processes for LAIs

  • Definition of formulation and process design space

  • Support for clinical and commercial process scale-up and validation

  • Technology transfer to GMP manufacturing facilities

  • Partner closely with Clinical Non-Clinical Quality Regulatory Manufacturing and Engineering teams to:

  • Define critical quality attributes (CQAs) and critical process parameters (CPPs) relevant to LAI performance

  • Support clinical strategy through formulation design and risk mitigation

  • Contribute to CMC regulatory submissions and health authority interactions

  • Provide scientific oversight and mentoring to junior scientists fostering capability development in LAI formulation science experimental design and data-driven decision making

  • Maintain awareness of emerging LAI technologies and delivery platforms contributing to internal capability assessments external collaborations and innovation initiatives aligned with portfolio and organizational strategy

Minimum Education Requirements

  • Ph.D. with 7 years industry experience or

  • M.S. with 10 years or

  • B.S. with 14 years in Pharmaceutics Pharmaceutical Sciences Chemical Engineering Biochemical Engineering Chemistry Materials Science or a related discipline

Required Experience and Skills

  • Deep expertise in parenteral drug product development with demonstrated experience in long-acting injectable or sustained-release formulations

  • Strong scientific understanding of:

  • Controlled-release mechanisms and LAI delivery systems

  • Drugpolymer and drugexcipient interactions

  • Formulation stability and performance characterization

  • Experience applying Quality by Design (QbD) principles and DOE approaches to formulation and process development

  • Experience supporting process scale-up validation and technology transfer for sterile injectable products

  • Working knowledge of CMC regulatory expectations for parenteral and extended-release products including development-stage and commercial submissions

  • Demonstrated ability to lead cross-functional teams influence strategy and communicate complex scientific concepts clearly

  • Proven mentoring and scientific leadership skills at the senior/principal level

Preferred Experience and Skills

  • Experience with LAI-specific platforms such as polymer depots microspheres nanosuspensions or in situ forming systems

  • Experience with devicedrug product integration including prefilled syringes or delivery systems relevant to LAIs

  • Understanding of clinical and patient-centric considerations influencing LAI design (e.g. dosing interval injection volume administration route)

  • Experience supporting global regulatory filings and health authority interactions

  • Track record of contributing to publications patents or external scientific collaborations in drug delivery or formulation science

Required Skills:

Cell Culture Process Development Cell Line Development Chemical Engineering Combination Products Finite Element Analysis (FEA) GMP Compliance Pharmaceutical Process Development Pharmaceutical Sciences Project Manufacturing Quality by Design Quality Control Management Quality Management Stability Calculations Strategic Thinking Technology Transfer

Preferred Skills:

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US and Puerto Rico Residents Only:

Our company is committed to inclusion ensuring that candidates can engage in a hiring process that exhibits their true capabilities. Please click here if you need an accommodation during the application or hiring process.

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 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

$173200.00 - $272600.00

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 employees 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 can apply for this role through (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:

Domestic

VISA Sponsorship:

Yes

Travel Requirements:

10%

Flexible Work Arrangements:

Not Applicable

Shift:

Not Indicated

Valid Driving License:

No

Hazardous Material(s):

n/a

Job Posting End Date:

08/1/2026

*A job posting is effective until 11:59:59PM on the day BEFOREthe listed job posting end date. Please ensure you apply to a job posting no later than the day BEFORE the job posting end date.


Required Experience:

Staff IC

Job DescriptionThe Sterile Product Development group is responsible for the development of parenteral dosage forms including long-acting injectables (LAIs) across small molecules peptides and biologics from preclinical development through commercialization. Our teams enable robust and scalable drug ...

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Merck & Co., Inc., Kenilworth, New Jersey, USA is known as “Merck” in the United States, Canada & Puerto Rico. We are known as “MSD” in Europe, Middle East, Africa, Latin America & Asia Pacific. We are a global biopharmaceutical leader with a diverse portfolio of prescription medicine ... View more

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