Pfizer Posted October 21, 2026

Associate Scientist in Protein Mass Spectrometry

Groton, United States Full time
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About this opportunity

ROLE SUMMARY

Pfizer currently has an open position for an Associate Scientist in Protein Mass Spectrometry (MS) within the Structural Analytical and Molecular Sciences (SAMS) department in Groton, CT. We are seeking a highly motivated individual with strong expertise in biochemistry and experimental protein characterization. Experience in native MS, nanoelectrospray applications or MS characterization of large molecules is a strong plus. The successful candidate will demonstrate scientific proficiency from the bench, be a fast learner of new skills, and work effectively in a matrix team environment.

We are an integrated and highly collaborative team of colleagues with technical expertise across molecular biology, protein biochemistry, biophysics, and structural biology. We have a strong track record of enabling hit-to-lead progression for small molecule modulators of diverse protein targets using integrated biophysical and structural approaches. We actively collaborate with Pfizer drug discovery teams across multiple therapeutic areas by providing comprehensive molecular and structural insights into therapeutic targets, lead molecules, and protein-ligand interactions.

ROLE RESPONSIBILITIES

Learn and deploy native MS and other structural MS methods for deep characterization of protein-ligand interactions

Handle and manipulate protein samples to enable and execute quantitative and qualitative binding studies.

Support and maintain open-access MS systems for a suite of users and assist with data collection and processing where needed.

Be part of multi-disciplinary teams to support discovery projects across diverse disease areas.

Effective oral and written communication of experimental work and analysis.

Perform timely notebook entries and review for completed experiments.

QUALIFICATIONS

BS in chemistry, biochemistry, biophysics, molecular biology or related field with ~1-3 years of relevant laboratory experience.

Skill and familiarity with handling and manipulating recombinant protein samples

Ability to multi-task to balance parallel activities.

Ability to troubleshoot scientific and technical challenges and contribute to their resolution.

Previous experience with mass spec instrumentation and data analysis is a strong plus.

Experience using common AI tools, including generative technologies such as ChatGPT or Microsoft Copilot, to support problem solving and enhance productivity.

Demonstrated curiosity for exploring how these tools can improve outcomes and understanding of responsible AI practices, including risk management and ethical use.

PHYSICAL/MENTAL REQUIREMENTS

Sitting, standing, lifting, bending, and walking. Ability to perform practical laboratory bench work and work on a computer (while standing or sitting). Ability to perform mathematical calculations and interpret data.

NON-STANDARD WORK SCHEDULE, TRAVEL OR ENVIRONMENT REQUIREMENTS

Minimal, if any travel related to this position.

Candidate must comply with laboratory safety practices

Work Location Assignment: On Premise

The annual base salary for this position ranges from $60,200.00 to $100,400.00. In addition, this position is eligible for participation in Pfizer’s Global Performance Plan with a bonus target of 7.5% of the base salary. We offer comprehensive and generous benefits and programs to help our colleagues lead healthy lives and to support each of life’s moments. Benefits offered include a 401(k) plan with Pfizer Matching Contributions and an additional Pfizer Retirement Savings Contribution, paid vacation, holiday and personal days, paid caregiver/parental and medical leave, and health benefits to include medical, prescription drug, dental and vision coverage. Learn more at Pfizer Candidate Site – U.S. Benefits | (uscandidates.mypfizerbenefits.com). Pfizer compensation structures and benefit packages are aligned based on the location of hire. The United States salary range provided does not apply to Tampa, FL or any location outside of the United States.

Relocation assistance may be available based on business needs and/or eligibility.

Candidates must be authorized to be employed in the U.S. by any employer.

U.S. work visa sponsorship (such as TN, O-1, H-1B, etc.) is not available for this role now or in the future.

Sunshine Act

Pfizer reports payments and other transfers of value to health care providers as required by federal and state transparency laws and implementing regulations.  These laws and regulations require Pfizer to provide government agencies with information such as a health care provider’s name, address and the type of payments or other value received, generally for public disclosure.  Subject to further legal review and statutory or regulatory clarification, which Pfizer intends to pursue, reimbursement of recruiting expenses for licensed physicians may constitute a reportable transfer of value under the federal transparency law commonly known as the Sunshine Act.  Therefore, if you are a licensed physician who incurs recruiting expenses as a result of interviewing with Pfizer that we pay or reimburse, your name, address and the amount of payments made currently will be reported to the government.  If you have questions regarding this matter, please do not hesitate to contact your Talent Acquisition representative.

EEO & Employment Eligibility

Pfizer is committed to equal opportunity in the terms and conditions of employment for all employees and job applicants without regard to race, color, religion, sex, sexual orientation, age, gender identity or gender expression, national origin, disability or veteran status.  Pfizer also complies with all applicable national, state and local laws governing nondiscrimination in employment as well as work authorization and employment eligibility verification requirements of the Immigration and Nationality Act and IRCA.  Pfizer is an E-Verify employer.  This position requires permanent work authorization in the United States.

Pfizer endeavors to make   www.pfizer.com/careers   accessible to all users. If you would like to contact us regarding the accessibility of our website or need assistance completing the application process and/or interviewing, please email   disabilityrecruitment@pfizer.com . This is to be used solely for accommodation requests with respect to the accessibility of our website, online application process and/or interviewing. Requests for any other reason will not be returned.

To learn more about acceptable and prohibited uses of AI during the recruitment process, please review our candidate AI-use guidelines available on  Pfizer Careers .

Research and Development

Job details

Seniority
Associate
Function
Drug Discovery & Preclinical Research
Therapeutic area
Not listed
Location
Groton, United States
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 180 comparable Associate Drug Discovery & Preclinical Research roles across 39 biopharma companies.

180Comparable roles tracked
161Currently active
39Companies hiring similar roles
18Countries represented

Salary context

63 of 180 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 $60,200/yr – $100,400/yr
Lowest disclosed · Lab Associate Flow Cytometry · IQVIA $34,700/yr – $72,300/yr
Highest disclosed · Advisor - Isotopic Chemistry · Lilly $153,000/yr – $246,400/yr
Peer group range $53,500 – $199,700 (median $90,200)

Where these roles are based

Top locations among the 180 comparable roles

United States118
France13
Germany11
Belgium7
United Kingdom6
Switzerland4

+ 12 more countries

Seniority mix

180 of 180 peers have a known seniority level

Intern/Fellow/Postdoc83
Associate73
Manager24

Therapeutic area mix

16 of 180 peers have a known therapeutic area; the rest are genuinely unlabeled, not hidden

Oncology8
Neuroscience4
Immunology2
Vaccines & Infectious Disease1
Cardiovascular / CVRM1

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The closest matches from our peer group, ranked by how similar they are, not how well you'd qualify for them -- treat this as market context, not a guaranteed shortlist; a weak match is labeled as one below.

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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.

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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.