Sr. Scientist, Mass Spectrometry

Req ID #:  177427

Shrewsbury, MA, US, 01545

For 70 years, Charles River employees have worked together to assist in the discovery, development and safe manufacture of new drug therapies. When you join our family, you will have a significant impact on the health and well-being of people across the globe. Whether your background is in life sciences, finance, IT, sales or another area, your skills will play an important role in the work we perform. In return, we’ll help you build a career that you can feel passionate about.

Basic Summary

Serve as the Principle Investigator/Senior Scientist responsible for the development and execution of highly complex method development and characterization studies related to the testing, characterization and analysis of biotherapeutics using mass spectrometry instrumentation and methodologies. Independently responsible for conducting and guiding method feasibility, development, optimization, method transfers, qualifications, validations, and routine testing in both R&D and cGMP environments.  Responsible for guidance and oversite of Jr. Staff performing same.  Additionally, will be responsible for management of projects including client interaction, interpretation and reporting of data for assigned research projects.  May be responsible for oversite of Laboratories and Scientific staff. 



  • Functioning independently as the Principal Investigator and technical expert, on highly complex studies, develop, perform, and troubleshoot experiments, tests, and procedures within accepted regulatory compliance for the characterization and analysis of biotherapeutics, by mass spectrometry, particularly HPLC-MS.
  • Generate and finalize high quality method and study protocols for sponsor and internal characterization and sample testing programs.  
  • Ensure that study protocols are amended to accurately reflect any changes in, scope of work or deliverables, in a timely fashion.
  • Function as the primary contact for the planning and execution of Sponsor interaction related to proposal management, research and method development, and for the design, scheduling, conduct and reporting of studies.
  • Provide oversight of laboratories and mentor and/or supervise scientific staff in the development and execution of studies to generate high quality scientific data within accepted regulatory compliance.
  • Provide mentoring and technical guidance to resolve analytical challenges in a timely fashion. 
  • Implement techniques to improve productivity, increase efficiencies and maintain laboratory state-of-the-art practices. 
  • Perform routine testing in techniques such as the following with a degree of reliability, efficiency and accuracy.
    • Total proteomics, identification and quantification of host cell proteins (HCP)
    • Targeted peptide quantification 
    • Peptide Mapping by LC-UV/MS (MS)
    • Intact Molecular Weight Analyses by LC-UV/MS
    • Sample preparation techniques including protein concentration determination,
    • SDS PAGE, SPE, HPLC Fraction Collection
    • Glycosylation site Mapping 
    • Released N- and O- Linked Glycosylation Profiling
    • Residuals and impurities investigations 
    • Methodologies developed for Orbitrap, QTOF, and Triple Quadrupole 
    • Use of Agilent and Thermo MS Platforms
  • Independently Review, interpret, analyze, evaluate, and discuss study results with research staff and Sponsor.  
  • Perform tabulation and statistical analyses of study data, as required.
  • Prepare high quality final reports appropriate for assigned study, including integration of supporting subcontractor(s)’s reports into final reports as required, with minimal assistance
  • Assist in the technical review of procedures and data and documentation.

Additional Duties and Resopnsiblities

  • Interact with clients regarding project design, scheduling and conduct as requested.
  • Collaborate with appropriate departments to coordinate performance of projects, discuss issues and prepare reports.
  • Provide scientific and technical leadership within Biologics to resolve challenges in a timely fashion, including research and development of new methodologies in study conduct.
  • Manage improvement projects (e.g. instrumentation system, redesign of SOP’s, research procedures or report formats).
  • Attend scientific meetings, conferences and training courses to enhance job and professional skills. 
  • Evaluate Mass Spectrometry software.
  • For both cGMP and R&D grade routine testing, generate analytical data and technical report(s) on-time with respect to internal and client deadlines.  
  • Maintain a weekly schedule to ensure all timelines are met.
  • Actively participate in laboratory instrumentation and equipment preventative maintenance and qualification programs.
  • Maintain a safe working environment by adhering to Company policies or procedures. Actively participate in laboratory maintenance.
  • Comply with all pertinent regulatory standards regarding environs, equipment and testing services.
  • Perform equipment troubleshooting and repair (as applicable) with minimal guidance.
  • Make detailed observations and maintain clear, accurate and timely documentation of all laboratory work.
  • Independently compose quality documentation including deviation reports and change control documentation with no/minimal guidance. 
  • Create, review and edit SOPs, protocols and other data forms and testing documentation. 
  • Follow all SOPs, CTMs and cGMP as they relate to specific tasks.
  • Assist in training and provide technical support of junior staff. 
  • Participate in transferring and training of analytical technical staff on methodology for which qualification has been successfully completed.
  • Maintain up to date training records on all procedures and protocols applicable to work duties.
  • Ability to work in a structured and regulated environment
  • Work productively in group situations as well as independently
  • Perform other related duties as assigned.  


  • Bachelor’s degree (B.A./B.S.) or equivalent in Chemistry/ Biochemistry or related scientific discipline. M.S. or Ph.D. strongly preferred.
  • This position may require overtime, weekend, holiday, and/or after hours shift coverage, as needed.
  • Minimum 7 years of relevant experience within a contract research, academic or pharmaceutical industry, including experience in the core competencies of characterization and analysis of complex biotherapeutics/ glycoproteins. 
  • An equivalent combination of education and experience with contract research or the pharmaceutical industry may be accepted as a satisfactory substitute for the specific education and experience listed above.
  • Demonstrated knowledge of cGMPs or regulatory affairs pertaining to the pharmaceutical and biological industries is preferred.
  • Ability to work on problems of complex scope where analysis of situation or data requires a review of identifiable factors.  
  • Exercises judgment within defined procedures and practices to determine appropriate action.
  • Demonstrated ability to operate typical laboratory equipment, specifically HPLC, Plate Reader, CE, spectrophotometer and other laboratory equipment required.  
  • Ability to handle multiple projects, prioritize work and meet deadlines within a cGMP environment.  
  • Capable of data interpretation of basic characterization and analysis of biotherapeutics (glycoproteins and peptides) using analytical laboratory tools and methodologies.
  • Capable of anticipating and recognizing potential problems.
  • Demonstrated independent analytical and problem-solving abilities.
  • Experience with Sponsor interaction and business development.  
  • Must possess excellent interpersonal skills to maintain communication across functional groups.
  • Ability to collaborate effectively within a group environment.
  • Able to communicate (verbal and written) effectively in a small group and one-on-one settings.  
  • Computer proficiency in MS Word, Excel, Outlook, HPLC, Mass spec instrumentation and data analysis software.
  • Ability to understand and use internal software programs such as LIMS required.


  • Must be able to remain in a stationary position 50% of the time while performing laboratory tasks.
  • Regularly observes, inspects, and interprets laboratory experiments, requiring close vision and the ability to adjust focus and detect and differentiate colors. 
  • Frequently and accurately operate laboratory pipettes.
  • Regularly lift and/or move up to 10 pounds and may occasionally lift and/or move up to 50 pounds. 
  • Regularly operates a computer and other office productivity machinery, such as a calculator, copy machine, and computer printer. 
  • Must regularly communicate with employees; must be able to exchange accurate information. 


  • Regularly wears protective clothing (cap, gloves, scrubs, lab coat, and safety glasses).
  • Regularly works with or near toxic or caustic chemicals.
  • May be exposed to fumes or airborne particles.
  • Regularly works in a chemical fume hood.
  • Occasionally works near moving mechanical parts.
  • Frequently works with biohazards.
  • May be exposed to unpleasant odors. 

Vaccine Mandate
Charles River is a U.S. Federal Contractor.  As a result, we must follow the Presidential Executive Order to mandate vaccinations, and ensure our employees are fully vaccinated against COVID-19.  Our main priority is the wellbeing, health, and safety of our people. We require proof of vaccination from all employees. 

Anyone with requests for disability-related and/or religious exemptions should contact Talent Acquisition ( so that information can be provided about the accommodation process at Charles River.


About Biologics Testing Solutions
With more than 50 years of experience and proven regulatory expertise, the Charles River Biologics group can address challenging projects for biotechnology and pharmaceutical companies worldwide. Offering a variety of services such as contamination and impurity testing, protein characterization, bioassays, viral clearance studies and stability and lot release programs, we support clients throughout the biologic development cycle, from the establishment and characterization of cell banks through preclinical and clinical studies to marketed products. Whether clients need stand-alone services, a unique package of testing, or insourced support, our Biologics group can create a custom solution to suit their needs.  Each year more than 20,000 biologic testing reports are sent each and over 200 licenses products are supported by our biologics testing solutions team.

About Charles River
Charles River is an early-stage contract research organization (CRO). We have built upon our foundation of laboratory animal medicine and science to develop a diverse portfolio of discovery and safety assessment services, both Good Laboratory Practice (GLP) and non-GLP, to support clients from target identification through preclinical development. Charles River also provides a suite of products and services to support our clients’ clinical laboratory testing needs and manufacturing activities. Utilizing this broad portfolio of products and services enables our clients to create a more flexible drug development model, which reduces their costs, enhances their productivity and effectiveness to increase speed to market.

With over 18,000 employees within 100 facilities in over 20 countries around the globe, we are strategically positioned to coordinate worldwide resources and apply multidisciplinary perspectives in resolving our client’s unique challenges. Our client base includes global pharmaceutical companies, biotechnology companies, government agencies and hospitals and academic institutions around the world. 

At Charles River, we are passionate about our role in improving the quality of people’s lives. Our mission, our excellent science and our strong sense of purpose guide us in all that we do, and we approach each day with the knowledge that our work helps to improve the health and well-being of many across the globe. We have proudly supported the development of >80% of the drugs approved by the FDA for the past 3 years.

Equal Employment Opportunity
Charles River Laboratories is an Equal Opportunity Employer - all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, veteran or disability status.

If you are interested in applying to Charles River Laboratories and need special assistance or an accommodation due to a disability to complete any forms or to otherwise participate in the resume submission process, please contact a member of our Human Resources team by sending an e-mail message to This contact is for accommodation requests for individuals with disabilities only and cannot be used to inquire about the status of applications.


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