Senior Scientist, Antibody Characterization

Xaira Therapeutics
Location
South San Francisco, California, United States
Job Type
Full-time
Posted
October 7, 2026
Salary Range
$136k - $170k USD

Job Description

About Xaira Therapeutics

Xaira is an innovative biotech startup focused on leveraging AI to transform drug discovery and development. The company is leading the development of generative AI models to design protein and antibody therapeutics, enabling the creation of medicines against historically hard-to-drug molecular targets. It is also developing foundation models for biology and disease to enable better target elucidation and patient stratification. Collectively, these technologies aim to continually enable the identification of novel therapies and to improve success in drug development. Xaira is headquartered in the San Francisco Bay Area, Seattle, and London.

About the Role

As a part of the Protein Analytics team, you will play a crucial role in discovering and developing novel biotherapeutics. The ideal candidate will have extensive experience characterization of monoclonal and bi/multispecific antibodies within a biotherapeutics discovery setting, coupled with a proactive and can-do attitude. This is a hands-on, lab-based position.

Responsibilities:

  • Support the discovery and development of therapeutic molecules through hands-on laboratory work.
  • Characterize antibodies in high-throughput manner via biolayer interferometry (BLI) and surface plasmon resonance (SPR) based biosensor platforms to determine Yes/No binding, Kinetics and Affinity information.
  • Screen antibodies and other antibody-like molecules for off-target binding assessment via BVP ELISA or other poly-specificity/poly-reactivity assays.
  • Perform early developability assessment on antibody panels using SPR, DLS, DSF, SEC and ELISA platforms.
  • Support other workflows as needed, including fluorescence based binding assays and assay automation.
  • Analyze experimental data, curate results and reports, and present findings to cross-functional teams.
  • Maintain experimental records in an ELN.
  • Ensure compliance with laboratory safety protocols and contribute to lab organization and operations.

Qualifications:

  • PhD degree in a relevant discipline with 5+ years of industry experience or a BS/MS degree with 10+ years of industry experience in biophysics, biochemistry, structural biology, or a related discipline
    • Candidates with fewer years of experience are also encouraged to apply, and the leveling of the role can be adjusted if needed
  • Extensive experience in antibody screening including monoclonals, bispecific, and other antibody-like molecules.
  • Extensive hands-on experience with ELISA, BLI and SPR based platforms (Carterra, Biacore).
  • Basic knowledge of protein production, purification and characterization techniques (including affinity, ion exchange, HIC, DLS, DSF and SEC).
  • Proficiency in data analysis software (e.g., GraphPad Prism) and other statistical tools.
  • Proactive attitude with a self-starter mindset.
  • Strong organizational, communication, and interpersonal skills.
  • Strong collaborative skills and interest in working in cross-functional teams and a startup environment.
  • Excellent problem-solving and troubleshooting abilities.
  • Ability to work independently with accountability and meticulous attention to detail.

Compensation
We offer a competitive compensation and benefits package, seeking to provide an open, flexible, and friendly work environment to empower employees and provide them with a platform to develop their long-term careers. A Summary of Benefits is available for all applicants. We offer a competitive package that includes base salary, bonus, and equity.  The base pay range for this position is expected to be $136,000 - $170,000 annually; however, the base pay offered may vary depending on the market, job-related knowledge, skills and capabilities, and experience.

Xaira Therapeutics an equal-opportunity employer. We believe that our strength is in our differences. Our goal to build a diverse and inclusive team began on day one, and it will never end.

TO ALL RECRUITMENT AGENCIES: Xaira Therapeutics does not accept agency resumes. Please do not forward resumes to our jobs alias or employees. Xaira Therapeutics is not responsible for any fees related to unsolicited resumes.

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Frequently Asked Questions

Where is the job located, and is it remote/hybrid/on-site?
The position is located in South San Francisco, California, United States. It is a hands-on, lab-based position, meaning it is on-site.
What are the key responsibilities of this role?
You will support biotherapeutic discovery through hands-on lab work, characterize antibodies using BLI and SPR platforms, screen for off-target binding, perform early developability assessments, analyze and present experimental data, and maintain records in an ELN.
What qualifications and experience are required?
You need a PhD with 5+ years of industry experience, or a BS/MS with 10+ years of industry experience in biophysics, biochemistry, structural biology, or a related field. Candidates with fewer years of experience are also encouraged to apply, as leveling can be adjusted.
What is the salary range for this position?
The expected annual base pay range is $136,000 - $170,000. The final base pay offered may vary depending on market factors, job-related knowledge, skills, capabilities, and experience.
What benefits does the company offer?
Xaira Therapeutics offers a competitive package that includes base salary, bonus, equity, and a comprehensive benefits package. A Summary of Benefits is available for all applicants.

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Job Information

Source: greenhouse
AI Relevance: 75/100 (Relevant)
Remote Type: onsite
Allowed Locations: South San Francisco, California, United States
Skills & Tags:
Drug Discovery & Development
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