Scientist II, Display Technologies

Xaira Therapeutics

$124K — $155K *
Pharmaceuticals & Biotech
Less than 5 years of experience
Job Overview by Ladders

Qualifications

  • PhD in Molecular Biology, Biochemistry, Immunology, Protein Engineering, or related field with 2-4 years of industry experience.
  • Significant hands-on expertise in phage display for antibody/protein discovery, including library design and validation.
  • Strong skills in molecular biology for library construction, such as cloning and mutagenesis.
  • Hands-on experience with flow cytometry (FACS) and ability to interpret data effectively.
  • Proven track record in running independent campaigns and troubleshooting, especially with membrane proteins in relevant expression systems.
  • Knowledge of antibody characterization assays (e.g., ELISA) and core molecular and cell biology techniques.
  • Exceptional analytical skills with detail-oriented experimental design and documentation.

Responsibilities

  • Design, execute, and manage phage display campaigns from library construction to hit validation for various targets.
  • Develop and optimize selection strategies for difficult targets, ensuring troubleshooting of antigen aspects.
  • Construct and build display libraries using robust molecular biology techniques to ensure diversity and quality.
  • Conduct clonal-level affinity and functional characterization and adapt these assays for high-throughput environments.
  • Collaborate with computational and machine learning teams to ensure effective data generation and quality control.
  • Mentor associate scientists, enhancing their workflows and contributing to the development of technical standards.
  • Lead the preparation of technical documentation including reports and presentations of findings.

Benefits

  • Flexible and open work environment promoting employee development and long-term career growth.
  • Opportunities for mentorship and knowledge-sharing among team members.
  • Collaborative multidisciplinary team atmosphere aimed at pushing scientific boundaries.
Full Job Description
About the Role

We are looking for an accomplished protein biochemist to own phage display campaigns end-to-end within our Display Technologies group. You bring deep hands-on display expertise and the judgment to design selection strategies, troubleshoot challenging targets, and turn campaigns into high-quality datasets that feed AI antibody design. You take pride in rigorous bench execution, you think critically about experimental design, and you are comfortable working against difficult target classes-including membrane proteins presented in cell-based expression systems or recombinant formats.

Beyond your own bench work, you will help raise the level of the group: mentoring associate scientists, setting technical standards, and partnering with computational and engineering colleagues to scale data generation. You thrive in a fast-paced, collaborative environment where pushing the boundaries of what is possible is the norm.

Responsibilities
  • Independently design, execute, and own phage display campaigns from library through panning and hit validation, across both soluble antigens and membrane-protein targets (e.g., GPCRs) presented in cell-based expression systems or recombinant formats.
  • Develop and optimize selection strategies for difficult target classes, including troubleshooting antigen production, presentation, and quality control.
  • Design and build display libraries, applying strong molecular biology fundamentals (cloning, mutagenesis, assembly) to generate high-quality, diverse repertoires.
  • Design and run clonal-level affinity and functional characterization-including flow cytometry (FACS), ELISA, and SPR-and help adapt these assays to higher-throughput and automated formats.
  • Partner with computational and ML colleagues to generate, structure, and quality-control data at scale for model training and evaluation.
  • Mentor associate scientists on display workflows, experimental design, and lab best practices; contribute to technical standards within the group.
  • Contribute to and lead the preparation of technical reports, presentations, and documentation of methods and results.

Qualifications
  • PhD in Molecular Biology, Biochemistry, Immunology, Protein Engineering, or a related field, with 2-4 years of relevant industry experience.
  • Significant hands-on expertise with antibody/protein discovery by phage display, including library design, build, panning/selection, and hit validation.
  • Strong molecular biology skills for library construction, including cloning, mutagenesis, and assembly, with the rigor to build high-quality, diverse libraries.
  • Hands-on flow cytometry (FACS) experience is required, including data interpretation and gating strategy.
  • Demonstrated ability to run campaigns independently and troubleshoot challenging targets; experience with membrane proteins (e.g., GPCRs) in cell-based expression systems or recombinant formats is strongly preferred.
  • Strong working knowledge of antibody binding and characterization assays (e.g., ELISA) and proficiency in core molecular and cell biology techniques, including mammalian cell culture.
  • Excellent analytical and problem-solving skills, with meticulous attention to detail and a rigorous, organized approach to experimental design and documentation.
  • Strong written and verbal communication skills, with the ability to present complex scientific concepts to both technical and non-technical audiences.
  • Ability to work effectively in a collaborative, multidisciplinary team, with a track record of fostering knowledge-sharing and supporting more junior colleagues.

Nice to Have
  • Experience with label-free affinity characterization (SPR, BLI/Octet).
  • Experience with alternative display formats (yeast, mammalian, or ribosome/mRNA display).
  • Experience with lab automation (e.g., Hamilton, Tecan, or similar liquid handling).
  • Working knowledge of scripting for analysis of large datasets (e.g., Python or R).

Compensation

Annual

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 $124,000 to $155,000 annually; however, the base pay offered may vary depending on the market, job-related knowledge, skills and capabilities, and experience.

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