Senior Scientist, Protein Engineering

Xaira Therapeutics

$150K — $170K *
Pharmaceuticals & Biotech
Less than 5 years of experience
Job Overview by Ladders

Qualifications

  • Ph.D. in molecular biology, biochemistry, structural biology, or related field.
  • 4+ years' experience in biotech or biopharma R&D for large molecule therapeutics.
  • Extensive hands-on experience in protein engineering and antibody characterization.
  • Deep expertise in antibody formats, production, purification, and characterization.
  • Proficiency in developability assessments and stability studies.
  • Fluent in protein visualization and structural modeling software (e.g., PyMOL, AlphaFold).
  • Strong record of scientific achievement with first-author publications or patents.

Responsibilities

  • Partner with Disease Biology and Therapeutic Binder Design teams to evaluate therapeutic targets and hypotheses.
  • Design and conduct protein engineering, including antibody optimization and antigen design.
  • Express, purify, and characterize antibodies and proteins using chromatographic and biochemical techniques.
  • Assess developability profiles of therapeutic molecules using in silico and analytical methods.
  • Collaborate across computational and biological teams to advance programs to clinical development.
  • Present findings at group meetings and ensure accurate documentation in ELN.
  • Mentor junior scientists and manage outsourcing of protein production and assay development.

Benefits

  • Comprehensive benefits package including health and wellness programs.
  • Opportunities for professional development and career advancement.
  • Friendly and flexible work environment that empowers employees.
  • Potential for equity participation in the company.
Full Job Description
About the Role

As a member of the Protein Engineering team, you will play a critical role in the discovery and development of next-generation protein therapeutics. You will be responsible for designing, producing, and characterizing proteins and antibodies, with an emphasis on engineering desired functions and evaluating drug-like properties. The ideal candidate will bring deep technical expertise in protein engineering, a strong understanding of antibody formats and developability metrics, and a collaborative mindset. This is a hands-on, on-site position.

Responsibilities
  • Partner with Disease Biology and Therapeutic Binder Design teams to evaluate new targets, define therapeutic hypotheses and target molecule profiles, and plan and coordinate the execution of drug discovery programs.
  • Design and carry out protein engineering efforts, including antibody format optimization and antigen design.
  • Express, purify, and characterize tool and therapeutic antibodies and proteins using chromatographic techniques and biophysical/biochemical assays.
  • Assess the developability profile of therapeutic molecules (e.g., stability, specificity, immunogenicity) by in silico and analytical methods.
  • Collaborate with computational protein design, screening, protein science, pharmacology and biology teams to advance programs toward clinical development.
  • Collaborate with computational teams and provide clear articulation of biological constraints including immunogenicity and manufacturability.
  • Present data at protein engineering group meetings and at cross-functional team meetings.
  • Maintain accurate, timely, and well-documented experiment records in ELN.
  • Ensure compliance with laboratory safety protocols; contribute to lab organization and operational efficiency.
  • Contribute to the preparation of technical reports, regulatory documentation, and scientific presentations.
  • Stay current on advancements in antibody engineering and protein design.
  • Mentor and develop junior scientific staff to foster a high-performing and collaborative team.
  • Manage and oversee CROs for outsourced protein production, assay development, and screening, ensuring data quality and timely delivery.

Qualifications
  • Ph.D. in a relevant scientific discipline, with a strong foundation in molecular biology, biochemistry, structural biology, or a related field.
  • Minimum of 4 years of post-academic experience in a biotech or biopharma R&D environment supporting large molecule-based therapeutic programs.
  • Extensive hands-on experience in protein engineering, including structural and functional characterization of antibodies and proteins using state-of-the-art analytical methods.
  • Deep expertise in antibody formats, production, purification, and characterization.
  • Proficiency in developability assessments and stability studies.
  • Fluency with protein visualization and structural modeling software (e.g., PyMOL, AlphaFold).
  • Experience with protein/protein interaction assays is preferred
  • Experience interacting with CMC and writing IND reports is preferred.
  • Strong organizational, communication, and interpersonal skills.
  • Ability to propose novel scientific approaches and a genuine interest in exploring relevant therapeutic hypotheses.
  • Proactive, self-starter mindset with excellent problem-solving and troubleshooting capabilities.
  • Enthusiasm for working in a fast-paced, collaborative startup environment, with a demonstrated ability to foster cooperation and knowledge sharing across multidisciplinary teams.
  • A strong record of scientific achievement as evidenced by first-author publications in peer-reviewed journals or granted patents.

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 $150,000 to $170,000 annually; however, the base pay offered may vary depending on the market, job-related knowledge, skills and capabilities, and experience.

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