Scientist / Senior Scientist

Yoh is seeking a Senior Scientist, Analytical Validation – NGS & Molecular Diagnostics for an exciting opportunity with an innovative biotechnology client in the South Bay Area. This role will be responsible for designing, executing, analyzing, and documenting analytical validation studies supporting advanced molecular diagnostic and next-generation sequencing (NGS) assays. The successful candidate will play a key role in establishing assay performance, reproducibility, robustness, and readiness for future clinical and regulatory milestones. We are looking for a scientist who combines strong molecular biology expertise with analytical rigor, statistical thinking, and hands-on experience in cell-free nucleic acid workflows, NGS technologies, and regulated assay development environments.

Department: Assay Development / Research & Development

Location: Sunnyvale, CAEmployment Type: Full-timeSalary: $160,000 - $220,000 (DOE)Responsibilities:Analytical Validation Strategy & ExecutionDesign and execute analytical validation studies for molecular diagnostic assays and NGS-based testing platforms.Develop scientifically sound study designs, acceptance criteria, sample size calculations, and statistical analysis plans.Lead studies evaluating:Limit of Blank (LoB), Limit of Detection (LoD), and Limit of Quantitation (LoQ), as applicableAnalytical sensitivity and specificityRepeatability and reproducibilityOperator, instrument, reagent lot, and workflow variabilityMethod comparison and analytical agreementInterference, contamination, carryover, and assay robustnessSpecimen and reagent stabilityIdentify assay failure modes and implement corrective actions to improve performance and reliability.Molecular Biology & NGS Assay DevelopmentPerform and optimize workflows involving plasma processing, cell-free nucleic acid extraction, quantification, and quality assessment.Execute NGS library preparation workflows including:End repairAdapter ligationIndexingAmplificationTarget enrichmentLibrary quality controlEvaluate the impact of DNA input quantity, library efficiency, sequencing depth, and molecular background noise on assay performance.Develop and qualify controls, reference materials, and test specimens for validation studies.Support characterization of low-abundance molecular signals and assay sensitivity limits.NGS Data Analysis & Performance AssessmentOperate and troubleshoot NGS instrumentation and associated workflows.Analyze sequencing and library quality metrics, including:Read depthCoverage uniformityMapping performanceLibrary complexityDuplication ratesOn-target performanceCollaborate with bioinformatics teams to evaluate analytical pipeline performance and quality-control thresholds.Perform statistical analyses using tools such as R, Python, JMP, SAS, or equivalent platforms.Generate technical summaries, validation reports, and performance assessments.Automation & Workflow OptimizationPartner with automation engineers to transfer molecular workflows onto automated liquid-handling platforms.Evaluate variability introduced by automation and support workflow qualification activities.Assess contamination control strategies, sample tracking systems, and recovery procedures.Support high-throughput laboratory process development and operational scale-up.Contribute to SOP development, troubleshooting guides, and workflow documentation.Quality & Regulatory SupportAuthor validation protocols, reports, deviation investigations, and technical documentation.Maintain traceable documentation for samples, instrumentation, reagents, software, and analytical methods.Support quality-system initiatives and documentation practices consistent with regulated laboratory environments.Collaborate with Quality and Regulatory teams on validation strategies, verification activities, design controls, and submission-support documentation.Cross-Functional LeadershipWork closely with assay development, bioinformatics, automation, clinical, quality, and regulatory teams.Present study results, technical findings, and recommendations to project stakeholders.Lead technical investigations and support risk mitigation activities.Contribute to assay development strategy, validation planning, and project execution.Required Qualifications:Ph.D. in Molecular Biology, Genetics, Genomics, Biochemistry, Bioengineering, or a related scientific discipline.Hands-on experience with cell-free nucleic acid workflows, liquid biopsy technologies, or low-input molecular assays.Strong background in NGS library preparation, sequencing workflows, and molecular assay development.Experience designing and executing analytical validation studies for molecular assays or NGS-based products.Working knowledge of:Analytical sensitivity and specificityLoB, LoD, and LoQ studiesPrecision and reproducibility assessmentsInterference and robustness testingStatistical study design and analysisExperience analyzing complex experimental data and applying appropriate statistical methodologies.Strong troubleshooting, documentation, experimental design, and scientific communication skills.Ability to work independently and effectively in a multidisciplinary environment.

Preferred Qualifications

Experience supporting development or validation of liquid biopsy, cell-free DNA (cfDNA), or other advanced molecular diagnostic assays.Experience with targeted sequencing, low-frequency variant detection, DNA methylation analysis, or related technologies.Familiarity with FDA-regulated diagnostic development programs and analytical validation frameworks.Knowledge of CLSI guidance and quality-system requirements applicable to molecular diagnostics.Experience with laboratory automation and liquid-handling systems.Proficiency in R, Python, JMP, SAS, or similar analytical tools.Experience with design controls, risk management, CAPA, method transfer, and assay lifecycle management.Experience supporting medium- to high-throughput laboratory operations. #IND-SPGEstimated Min Rate: $160000.00Estimated Max Rate: $220000.00What’s In It for You?We welcome you to be a part of the largest and legendary global staffing companies to meet your career aspirations. Yoh’s network of client companies has been employing professionals like you for over 65 years in the U.S., UK and Canada. Join Yoh’s extensive talent community that will provide you with access to Yoh’s vast network of opportunities and gain access to this exclusive opportunity available to you. Benefit eligibility is in accordance with applicable laws and client requirements. Benefits include:Medical, Prescription, Dental & Vision Benefits (for employees working 20+ hours per week)Health Savings Account (HSA) (for employees working 20+ hours per week)Life & Disability Insurance (for employees working 20+ hours per week)MetLife Voluntary BenefitsEmployee Assistance Program (EAP)401K Retirement Savings PlanDirect Deposit & weekly epayrollReferral Bonus ProgramsCertification and training opportunitiesNote: Any pay ranges displayed are estimations. Actual pay is determined by an applicant's experience, technical expertise, and other qualifications as listed in the job description. All qualified applicants are welcome to apply.Yoh, a Day & Zimmermann company, 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, disability, or status as a protected veteran.Visit https://www.yoh.com/applicants-with-disabilities to contact us if you are an individual with a disability and require accommodation in the application process.For California applicants, qualified applicants with arrest or conviction records will be considered for employment in accordance with the Los Angeles County Fair Chance Ordinance for Employers and the California Fair Chance Act. All of the material job duties described in this posting are job duties for which a criminal history may have a direct, adverse, and negative relationship potentially resulting in the withdrawal of a conditional offer of employment.It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.By applying and submitting your resume, you authorize Yoh to review and reformat your resume to meet Yoh’s hiring clients’ preferences. To learn more about Yoh’s privacy practices, please see our Candidate Privacy Notice: https://www.yoh.com/privacy-noticeStay Safe During Your Job SearchFraudulent recruiting communications have become increasingly common. Emails from Yoh recruiters will only come from an @yoh.com email address. Yoh will never ask candidates to pay fees, purchase equipment, send gift cards, or transfer funds as part of the recruiting or hiring process. If you receive a communication that appears suspicious or requests payment, contact Yoh directly before responding or sharing personal information.