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Principal Scientist Assay Development Jobs (NOW HIRING)

Novartis

Principal Scientist, Biophysicist

San Diego, CA

$119K - $222K/yr

You will work on-site full-time and bring deep expertise in biophysical assay development and high ... Principal Scientist I/Principal Scientist II Position Location: onsite, La Jolla, CA #LI-onsite We ...

GrapheneDx

Research Scientist, Assay Development

Boston, MA · On-site

$85K - $120K/yr

The Research Scientist in Assay Development will design and execute experiments to functionalize sensors with nucleic acid or antibody probes for biomarker detection, contributing to the development ...

Legend Biotech USA, Inc.

... including assay development, validation, CRO oversight, and deep data interpretation to support ... Conduct deep scientific review and interpretation of flow cytometry datasets to support PK/PD ...

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Principal Scientist Assay Development information

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$68.5K

$144K

$190.5K

How much do principal scientist assay development jobs pay per year?

As of Aug 4, 2026, the average yearly pay for principal scientist assay development in the United States is $144,009.00, according to ZipRecruiter salary data. Most workers in this role earn between $117,500.00 and $169,000.00 per year, depending on experience, location, and employer.

What are the key skills and qualifications needed to thrive as a principal scientist assay development, and why are they important?

To thrive as a Principal Scientist Assay Development, you need advanced expertise in biochemistry or molecular biology, a PhD or equivalent experience, and a strong background in assay design and validation. Familiarity with laboratory automation, data analysis software, and regulatory compliance systems such as GLP/GMP is typically required. Leadership, project management, and effective communication are crucial soft skills for guiding teams and collaborating across departments. These skills ensure robust assay performance, regulatory adherence, and efficient innovation in complex scientific environments.

What is the difference between Principal Scientist Assay Development vs Senior Scientist Assay Development?

AspectPrincipal Scientist Assay DevelopmentSenior Scientist Assay Development
CredentialsAdvanced degree (PhD or equivalent), extensive experienceMaster's or PhD, significant industry experience
Work EnvironmentLeads assay development projects, strategic planningExecutes assay development tasks, supports project teams
Employer & Industry UsagePharmaceutical, biotech, CROs, biotech companiesPharmaceutical, biotech, research labs

The main difference between Principal Scientist Assay Development and Senior Scientist Assay Development lies in their level of responsibility and leadership. Principal Scientists typically lead projects, set strategies, and have more extensive experience, while Senior Scientists focus on executing assays and supporting project goals. Both roles require strong technical expertise, but the Principal Scientist position involves higher-level decision-making and oversight.

What are some common challenges faced by principal scientists assay development, and how can they be addressed?

Principal Scientists in Assay Development often encounter challenges such as optimizing assay sensitivity and specificity, troubleshooting inconsistent results, and scaling up assays for high-throughput screening. Addressing these issues requires strong analytical thinking, effective cross-functional collaboration with research, engineering, and quality assurance teams, and staying updated with the latest technological advances. Regularly reviewing validation protocols and actively participating in peer discussions can also help in overcoming technical hurdles and ensuring robust assay performance.

What does a principal scientist assay development do?

A Principal Scientist in Assay Development leads the design, optimization, and validation of assays used for research, diagnostics, or drug development. They oversee laboratory teams, develop protocols, and ensure that assays meet regulatory and quality standards. Their role also involves troubleshooting complex scientific problems, collaborating with cross-functional teams, and staying current with technological advances in assay technologies. Principal Scientists play a key role in translating scientific concepts into reliable, reproducible assays that support broader organizational goals.
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What cities are hiring for Principal Scientist Assay Development jobs? Cities with the most Principal Scientist Assay Development job openings:
What states have the most Principal Scientist Assay Development jobs? States with the most job openings for Principal Scientist Assay Development jobs include:
What job categories do people searching Principal Scientist Assay Development jobs look for? The top searched job categories for Principal Scientist Assay Development jobs are:
Principal Scientist Assay Development jobs near you
Infographic showing various Principal Scientist Assay Development job openings in the United States as of July 2026, with employment types broken down into 3% Locum Tenens, 1% As Needed, 84% Full Time, 2% Part Time, 4% Contract, and 6% Summer. Highlights an 93% Physical, 2% Hybrid, and 5% Remote job distribution, with an average salary of $144,009 per year, or $69.2 per hour.

Sr. Principal Scientist

Legend Biotech US

Somerset, NJ • On-site

Other

Re-posted 8 days ago

Job description

Legend Biotech is seeking a Sr. Principal/Principal Scientist as part of the Research & Early Development team based in Somerset, NJ.

Role Overview

Legend Biotech is seeking a highly experienced Senior Principal Scientist / Principal Scientist - Flow Cytometry to provide scientific leadership and hands-on expertise in flow cytometry to support cell and gene therapy programs from IND-enabling studies through early- and late-stage clinical development. This role is critical for ensuring scientific rigor, data quality, and strategic insight across in-house and outsourced flow cytometry activities, including assay development, validation, CRO oversight, and deep data interpretation to support translational, PK/PD, and regulatory decision-making.

Key Responsibilities

  • Lead the design, development, optimization, qualification, and validation of multicolor and spectral flow cytometry assays supporting IND-enabling animal studies and clinical trials.
  • Provide subject-matter expertise in panel design, antibody and reagent qualification, gating strategies, and data analysis for complex immunophenotyping applications.
  • Conduct deep scientific review and interpretation of flow cytometry datasets to support PK/PD, mechanism-of-action, and translational insights.
  • Serve as the primary scientific lead for external laboratories and CROs performing flow cytometry assays.
  • Oversee assay transfer, validation, execution, troubleshooting, and data delivery at CROs.
  • Ensure outsourced activities meet Legend quality standards, regulatory expectations, and program timelines.
  • Identify risks related to assay performance, data quality, and operational execution, and implement mitigation strategies.
  • Author, review, and approve bioanalytical assay validation reports, study reports, and regulatory documentation.
  • Ensure flow cytometry assays and data packages are inspection-ready and compliant with GxP principles and data integrity requirements.
  • Contribute to bioanalytical sections of IND and other regulatory submissions.
  • Partner with Clinical, Translational Research, Biomarkers, Nonclinical Safety, and Data Science teams to align assay strategy with program objectives.
  • Provide scientific input to study design, endpoint selection, and interpretation of bioanalytical results.
  • Communicate complex data clearly to multidisciplinary stakeholders.
  • Establish and maintain SOPs, best practices, and governance for in-house flow cytometry workflows.
  • Mentor and scientifically guide junior scientists and associates.
  • Evaluate and implement new technologies, platforms, and analytical approaches to enhance capabilities.

Requirements

  • Ph.D. in Immunology, Cell Biology, Molecular Biology, or related discipline with 8+ years (Principal Scientist) or 10+ years (Senior Principal Scientist) of relevant industry experience; or M.S. with 12+ years of experience.
  • Extensive hands-on experience with multicolor and spectral flow cytometry platforms.
  • Demonstrated experience supporting cell therapy and/or gene therapy programs.
  • Strong understanding of bioanalytical method development, validation, and regulatory expectations.
  • Proven ability to lead complex programs, influence cross-functional teams, and provide strategic scientific direction.
  • Experience overseeing CROs and external vendors.
  • Excellent written and verbal communication skills.
  • Experience with CAR-T, in vivo gene delivery, or other advanced cell therapy platforms.
  • Experience contributing to IND-enabling or regulatory filings.
  • Background in translational PK/PD applications of flow cytometry. 

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