Associate Scientist, Immunogenicity Assessment

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

We are seeking a Scientist to join our Immunogenicity team within Biology Pharmacology to lead and execute immunogenicity risk assessment for de novo protein therapeutics. This role is central to our Immunogenicity Risk Assessment and Management framework, encompassing pre-clinical immunogenicity characterization, ADA assay development, and risk-tiering of novel biologic formats including VHH antibodies, minibinders, and T cell engager (TCE) bispecific antibodies. You will operate at the interface of translational science and assay development, partnering closely with discovery biology, process development, and clinical teams to ensure immunogenic risk is identified and managed across the development pipeline.

About You The successful candidate is a hands-on immunogenicity scientist with a strong grasp of antibody biology, T and B cell immunology, and bioanalytical assay development. At this level, you independently design and execute experiments of significant scope and complexity — establishing experimental strategy, selecting appropriate methods, drawing conclusions, and defining next steps with minimal supervision. You are comfortable evaluating variable factors in complex datasets, exercising scientific judgment to interpret relationships and solve problems within defined frameworks, and knowing when to seek guidance on broader implications.

You actively collaborate, share knowledge, and support peers across the immunogenicity and broader translational sciences team. You are comfortable contributing to cross-functional updates and have a track record of identifying opportunities for improvement and implementing changes within your personal scope. You thrive in fast-paced environments and bring a rigorous yet pragmatic approach to assay design, data interpretation, and risk communication.

You are comfortable leveraging AI tools to accelerate experimental design, synthesize complex datasets, and surface actionable insights.

Key Responsibilities

Independently design and execute immunogenicity risk assessments including pre-existing ADA screening and T cell reactivity profiling. Develop and optimize ADA assay platforms (liquid-phase bridging MSD ECL); independently define cut points, validation strategies, and risk classification. Design and execute T cell activation assays with fresh and cryopreserved PBMCs; interpret MSD V-Plex cytokine readouts using appropriate metrics and recommend assay adjustments based on results.

Leverage AI tools to support experiment design, data summarization, and interpretation of complex immunogenicity datasets; apply AI-assisted approaches to identify patterns across multi-donor and multi-analyte studies and generate hypothesis-driven insights. Align immunogenicity programs with EMA and FDA guidance; Assist in preparing risk summaries and data packages for IND-enabling and clinical support. Collaborate with discovery and process development teams to de-risk immunogenicity at candidate selection; share knowledge and support peers across functions.

Identify and implement improvements to immunogenicity workflows within personal scope; contribute to our risk assessment framework evolution and internal best practices.