Merck Posted October 14, 2026

Associate Principal Scientist, Biologics Analytical Research & Development

Rahway, New Jersey, United States of America FULL_TIME
Notify me about similar jobs
This position is no longer accepting applications.

Merck has closed or removed this posting -- see current similar openings below.

View the original listing (may no longer be live).

About this opportunity

Job Description

The Biologics Analytical Research & Development department of our Research & Development Division is seeking applicants for an Associate Principal Scientist position available at its Rahway, New Jersey research facility.  The Associate Principal Scientist is a laboratory-based scientific role tasked with solving complex analytical problems at the interface of biology, chemistry, and lab informatics disciplines to enable development of Biologics drug substances and drug products.  The successful candidate must function well and be able to collaborate in a fast-paced, integrated, multidisciplinary team environment.  The qualified candidate will be responsible for development, qualification, implementation, troubleshooting and transfer of analytical methods for monoclonal proteins or other complex therapeutic proteins. Responsibilities include development of new assay platforms, benchmarking current approaches/techniques to industry standards, and providing technical leadership of design of experiments and data interpretation.  Applicants must have effective organizational, multi-tasking, oral/written communications skills, show scientific leadership, and a desire to conduct research and publish.  Experience leading small groups of technical personnel and analytical projects will aid in distinguishing candidates.  Evidence of strong cross-functional collaboration in an academic or industrial setting is also preferred.

Qualifications

Education:

B.S. in Chemistry, Biochemistry, Engineering, Pharmaceuticals, or related field with 12 years of relevant experience; or Master's degree with 8 years of relevant experience; or Ph.D. with 4 years of relevant experience.

Required Experience and Skills:

Strong background and experience in separations science

Extensive experience with UPLC/HPLC analysis of biologics (e.g. SEC, RP, IEX)

Extensive experience with process- and impurity-related residual assay development using molecular biology and immunoassay techniques

Background in Analytical Methodologies and sound scientific understanding of Critical Quality Attributes/QbD/DOE principles as well as data analysis and statistics for setting specifications

Ability to design, execute and/or direct the development and qualification of release, characterization, and stability assays for testing of clinical trial material and in support of product and process development

A strong team player with excellent oral and written communication skills; ability to work both independently for development of assays and cross-functionally for successful transfer of assays. Plan assay optimization and documentation to meet program deadlines.

Authoring and reviewing internal technical reports, sections of regulatory filings (e.g., IND, BLA) and external scientific publications.

Experience with matrix management and peer to peer coaching

Accurately and efficiently documentation of experiments

Strong ability to deliver complex objectives under aggressive timelines in a rapidly changing environment.

Preferred Experience and Skills:

Understanding of protein degradation mechanisms and link between analytical methodologies for analysis.

Experience with qualification, validation, and transfer of assays to a GLP or regulated laboratory environment as listed in ICH Q2 and USP .

Experience in representing analytical functional area on project teams.

Experience with complex glycan analysis and link to mechanisms of actions.

Experience in analysis of various Biologic modalities (e.g., mAb, antibody-drug conjugate, fusion protein).

#AR&D

Required Skills:

Adaptability, Analytical Method Development, Assay Development, Biological Assay Development, Cell-Based Assays, Chromatographic Techniques, Cross-Functional Teamwork, External Collaboration, High Resolution Mass Spectrometry (HRMS), Liquid Chromatography-Mass Spectrometry (LC-MS), Mass Spectrometry Analysis, Optimism, Process Analytical Technology (PAT), Protein Analysis, Teamwork

Preferred Skills:

Current Employees apply HERE

Current Contingent Workers apply HERE

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 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:

EEOC Know Your Rights

EEOC GINA Supplement​

We are proud to be a company that embraces the value of bringing together, talented, and committed people with diverse experiences, perspectives, skills and backgrounds. The fastest way to breakthrough innovation is when people with diverse ideas, broad experiences, backgrounds, and skills come together in an inclusive environment. We encourage our colleagues to respectfully challenge one another’s thinking and approach problems collectively.

Learn more about your rights, including under California, Colorado and other US State Acts

The primary location for this posting is:

USA - New Jersey - Rahway

Where required by law, the compensation range for this role is provided below.

The salary range for the primary location of this role is:

$142,400.00 - $224,100.00

This range reflects the Company's reasonable expectation of the base salary applicable to this role at the time of 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 .

Additional location(s): Please note the salary range above applies to the Primary Location of the position. Where a role has other listed locations, different compensation guidelines may apply. You may find the salary ranges for additional locations below. If the salary range is not listed for the location you are applying to, our Talent Acquisition team will provide further information to you relevant to your location.

Additional location(s) Compensation Information:

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:

10/16/2026 *A job posting is effective until 11:59:59PM on the day BEFORE  the listed job posting end date. Please ensure you apply to a job posting no later than the day BEFORE the job posting end date.

Requisition ID:R399133

Job details

Seniority
Principal
Function
Drug Discovery & Preclinical Research
Therapeutic area
Not listed
Location
Rahway, New Jersey, United States of America
Employment type
FULL_TIME

How this role compares

Computed from every other active Drug Discovery & Preclinical Research role in our database, not just this employer's listings.

We currently track 460 comparable Principal Drug Discovery & Preclinical Research roles across 55 biopharma companies.

460Comparable roles tracked
426Currently active
55Companies hiring similar roles
21Countries represented

Salary context

230 of 460 peers report a salary range (USD, annualized)

Peers share this role's job function and a matching or adjacent seniority level -- not necessarily the same therapeutic area or country.

This roleSubject Not listed on this posting
Lowest disclosed · Senior Animal Behaviorist - Primate · Labcorp $70,000/yr – $80,000/yr
Peer group range $75,000 – $322,000 (median $169,300)

Where these roles are based

Top locations among the 460 comparable roles

United States345
China22
India16
United Kingdom12
Switzerland10
Germany9

+ 15 more countries

Seniority mix

460 of 460 peers have a known seniority level

Senior233
Principal167
Director60

Therapeutic area mix

62 of 460 peers have a known therapeutic area; the rest are genuinely unlabeled, not hidden

Immunology22
Oncology19
Neuroscience14
Cardiovascular / CVRM3
Vaccines & Infectious Disease1
Respiratory1
Gastroenterology1
Dermatology & Aesthetics1

Currently open similar roles

This posting is closed, but here are live openings closest to it -- ranked by similarity, not by how well you'd qualify for them.

60%similar
Lilly Indianapolis, Indiana, United States of America Principal
Same function Same seniority Same country
60%similar
Lilly Indianapolis, Indiana, United States of America Principal
Same function Same seniority Same country
60%similar
Lilly Indianapolis, Indiana, United States of America Principal
Same function Same seniority Same country
60%similar
AbbVie North Chicago, IL Principal
Same function Same seniority Same country
60%similar
AbbVie North Chicago, IL Principal
Same function Same seniority Same country
60%similar
AbbVie San Francisco, CA Principal
Same function Same seniority Same country

Notify me about similar jobs

Get an email when we spot other openings like this one – same job function, comparable seniority, roles you'd actually want to see.

Or follow a whole field: get every new Drug Discovery & Preclinical Research job in the United States, and choose locations and companies.

How we calculate "similar"

No black box, no LLM guesswork: a deterministic score built from four normalized attributes. Here's this role's own peer group at different match levels, so you can see the mechanism, not just the result.

Every comparison starts from the same 100-point budget: 25 for working in the same function, 40 for the same therapeutic area, 20 for the same or adjacent seniority, 15 for the same country. A dimension we can't confirm on both sides contributes nothing, never a guess, never a free pass.

60%
Advisor / Senior Advisor, CNS/PNS NAMs – Investigative Toxicology
Lilly · Indianapolis, Indiana, United States of America · Principal
Function Therapeutic area Seniority Country
60%
Advisor / Senior Advisor, Cardiovascular NAMs – Investigative Toxicology
Lilly · Indianapolis, Indiana, United States of America · Principal
Function Therapeutic area Seniority Country
60%
Principal Scientist I, Biologics Analytical Research and Development
AbbVie · San Francisco, CA · Principal
Function Therapeutic area Seniority Country
60%
Principal Research Scientist II, Process Chemistry
AbbVie · North Chicago, IL · Principal
Function Therapeutic area Seniority Country
Unmatched or unknown dimensions score exactly the same: 0 points, never a partial guess. A role we know almost nothing about beyond its function bottoms out at 25%; it never inflates to 100% just because there's little to compare against. Seniority uses a defined ladder (Associate → Manager → Associate Director → Senior → Principal → Director → Senior Director → Executive/VP) so "Director" and "Senior Director" count as adjacent, but "Director" and "Executive/VP" do not.