SENIOR SCIENTIST, BIOANALYTICS

Sutro Biopharma, Inc.; South San Francisco (CA); On-site; USD 174,000 - 208,000; Full time

Job summary

A leading biotechnology firm in South San Francisco is seeking a highly motivated Senior Scientist in Bioanalytics. The candidate will lead bioanalytical strategies, develop methods for ADCs, and manage CRO relationships. Requires a Ph.D. with 7+ years experience or equivalent, strong LC-MS knowledge, and excellent communication skills. The anticipated salary range is between $174,000 and $208,000 annually, excluding bonuses and benefits. Inclusive workplace environment commitment to diversity is emphasized.

Qualifications

• 7+ years of relevant industry experience in bioanalytical environments.
• Proven ability to lead complex bioanalytical strategies.
• Strong expertise with ADC bioanalysis is necessary.

Responsibilities

• Lead and implement bioanalytical strategies for drug development.
• Develop LC-MS/MS-based methods to quantify antibodies and small molecules.
• Transfer bioanalytical methods to CROs and oversee studies.

Skills

LC-MS instrumentation

Bioanalytical methods development

Communication skills

Collaboration

Drug-to-antibody ratio (DAR) characterization

Education

Ph.D. in PK/ADME, analytical chemistry or related field

12+ years of relevant industry experience (without Ph.D.)

Tools

Triple quadrupole mass spectrometer

High-resolution mass spectrometer

LIMS

Analytical/data processing software

Job description

SENIOR SCIENTIST, BIOANALYTICS

Sutro Biopharma is seeking a highly motivated and experienced Senior Bioanalytical Scientist to join its Preclinical Development team in South San Francisco, CA. The successful candidate will lead the design and execution of bioanalytical strategies for discovery, preclinical, and early clinical development programs. They will be responsible for developing and qualifying bioanalytical methods for small molecules and antibody-drug conjugates (ADCs), including drug-to-antibody ratio (DAR) assessment, and transferring these methods to CROs to enable preclinical and clinical studies. This role requires deep expertise in LC-MS/MS-based bioanalysis and a proven track record of independently driving complex programs in a fast-paced, collaborative environment.

Responsibilities

• Lead and implement bioanalytical (BA) strategies to address key scientific questions across discovery, preclinical, and early clinical programs
• Develop stage-appropriate LC-MS/MS-based bioanalytical methods to quantify antibodies, ADCs, and small molecules in various biological matrices
• Transfer bioanalytical methods to CROs and serve as the primary scientific lead overseeing external studies
• Manage CRO relationships to ensure high-quality data delivery, adherence to timelines, and alignment with program goals
• Assess in vitro and in vivo drug-to-antibody ratio (DAR) stability using high-resolution mass spectrometry
• Analyze, interpret, and clearly communicate DMPK/BA data to internal project teams, senior leadership, and external collaborators
• Author high-quality DMPK/BA reports to support IND submissions, regulatory filings, patent applications, and publications
• Mentor and supervise junior bioanalytical scientists as needed
• Serve as a functional representative on cross-functional project teams, including partnered programs
• Contribute to the development of organizational processes, infrastructure, and resource planning, including capital equipment and budget considerations

Qualifications

• Ph.D. in PK/ADME, analytical chemistry, or a related field with 7+ years of relevant industry experience (biologics and small molecules)
• Exceptional candidates without a Ph.D. with 12+ years of relevant experience may be considered
• Proven track record of developing and optimizing quantitative bioanalytical methods for small molecules, biologics, and conjugates
• Strong expertise in LC-MS instrumentation, including triple quadrupole and high-resolution mass spectrometry
• Hands‑on experience with ADC bioanalysis, including DAR characterization
• Demonstrated ability to independently establish new experimental protocols using novel methods or techniques
• Experience with ligand-binding assays is a plus
• Experience developing automated sample handling and assay workflows is preferred
• Familiarity with PK analysis and interpretation
• Working knowledge of regulatory guidance (FDA, ICH) relevant to bioanalytical and DMPK studies
• Experience with LIMS and common analytical/data processing software
• Demonstrated ability to author technical reports supporting regulatory filings, patents, and publications
• Excellent communication skills and ability to thrive in a collaborative, cross-functional environment

The anticipated salary range for fully qualified candidates applying for this role at Sutro Biopharma’s California based locations will be $174,000 - $208,000 (not including bonus, equity, and benefits). The final salary offered will be dependent on several factors that include and are not limited to relevant previous experience, job responsibilities and duration of experience, the type and length of experience within the industry and education.

As an equal opportunity employer, we believe in fostering a culture that is inclusive and values diversity in background and opinions. Sutro Biopharma hires extraordinary individuals into every position in the company and is committed to the diversity of our team. Our company progresses without regard of race, ethnicity, gender, sexual orientation, religious belief, age, disability or citizenship status. We are dedicated to creating a safe environment where our employees can grow and succeed together.