Senior / Principal Scientist, Antibody Engineering & Rational Design
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Before you apply
Salary$177k – $235k
LocationSouth San Francisco, CA, South San Francisco, CA
Work modeon-site
Typefull-time
SeniorityLead
Experience5+ yrs
DepartmentDISCOVERY TECHNOLOGIES
Company size501–1,000 people
PostedDec 20, 2025 · 10mo ago
Verified live1d ago
May no longer be actively hiring
Posted by the company on Dec 20, 202555% of this company's open roles have been listed for 90+ days
At a glanceSummarised by Seekless from the posting.
Ph.D. in molecular biology, biochemistry, biophysics, computational chemistry, structural biology, or related discipline
5+ years (for Senior Scientist) or 8+ years (for Principal Scientist) post-PhD experience in antibody/protein engineering within the biotech or biopharma industry
Demonstrated ability to work closely with data scientists and ML engineers and to articulate biological constraints to collaboratively improve model performance
Hands-on experience using state of the art ML protein design tools (e.g. AlphaFold, Boltz, RFDiffusion, ProteinMPNN)
Fluency with programming in Python
Extensive experience in rational design for humanization, affinity/specificity optimization, pH-dependence, and liability removal
Strong understanding of biophysical characterization to ensure designed molecules are developable therapeutics
Experience technically managing CROs for gene mutagenesis, in vitro library design, protein production, and screening assays
Ability to independently propose novel scientific approaches and solve complex technical hurdles
Experience with structural modeling using molecular dynamics or other physics-based simulation to validate and optimize designs
Experience designing experiments specifically to generate high-quality training data for ML models
Experience running computational pipelines for de novo antibody or VHH design
Familiarity with common scientific computing and machine learning Python libraries (e.g. NumPy, SciPy, PyTorch)
Experience with in vivo and in vitro discovery of antibodies by display technologies
Experience in engineering multi-specific antibodies
Must be willing to work onsite 5 days a week
Skills
Python
AlphaFold
Boltz
RFDiffusion
ProteinMPNN
NumPy
SciPy
PyTorch
Schrödinger
MOE
Rosetta
Who We Are:
Calico (Calico Life Sciences LLC) is an Alphabet-founded research and development company whose mission is to harness advanced technologies and model systems to increase our understanding of the biology that controls human aging. Calico will use that knowledge to devise interventions that enable people to lead longer and healthier lives. Calico’s highly innovative technology labs, its commitment to curiosity-driven discovery science, and, with academic and industry partners, its vibrant drug-development pipeline, together create an inspiring and exciting place to catalyze and enable medical breakthroughs.
Position Description:
We are seeking an innovative Senior Scientist / Principal Scientist to bridge the gap between traditional antibody discovery and cutting-edge computational design. In this role, you will serve as the primary scientific liaison between the wet-lab antibody team and our machine learning team, driving the evolution of our “Design-Build-Test-Learn” cycle.
Responsibilities
You will be responsible for using internal and external computational tools to generate designs for a variety of discovery campaigns and optimization of antibodies. You will also ensure that the computational predictions are rigorously validated and that the resulting biological data is structured to retrain and refine our internal models. We are looking for a deep expert in therapeutic antibody development who is eager to move beyond traditional random screening and champion a rational, data-driven approach to biologic drug discovery.
Position Requirements:
•
Ph.D. in molecular biology, biochemistry, biophysics, computational chemistry, structural biology, or related discipline
•
5+ years’ (for Senior Scientist) or 8+ years (for Principal Scientist) post-PhD experience in antibody/protein engineering within the biotech or biopharma industry
•
Demonstrated ability to work closely with data scientists and ML engineers and to articulate biological constraints (e.g., immunogenicity, manufacturability) to collaboratively improve model performance
•
Hands-on experience using state of the art ML protein design tools (e.g. AlphaFold, Boltz, RFDiffusion, ProteinMPNN)
•
Fluency with programming in Python
•
Extensive experience in rational design for humanization, affinity/specificity optimization, pH-dependence, and liability removal
•
Strong understanding of biophysical characterization to ensure designed molecules are developable therapeutics
•
Experience technically managing CROs for gene mutagenesis, in vitro library design, protein production, and screening assays
•
Ability to independently propose novel scientific approaches and solve complex technical hurdles
•
Must be willing to work onsite 5 days a week
Nice to Have:
•
Experience with structural modeling using molecular dynamics or other physics-based simulation (e.g. Schrödinger, MOE, Rosetta) to validate and optimize designs
•
Experience designing experiments specifically to generate high-quality training data for ML models (e.g. focused libraries or systematic mutagenesis for optimization of binding, manufacturability, biophysical properties and stability)
•
Experience running computational pipelines for de novo antibody or VHH design
•
Familiarity with common scientific computing and machine learning Python libraries (e.g. NumPy, SciPy, PyTorch)
•
Experience with in vivo and in vitro discovery of antibodies by display technologies
•
Experience in engineering multi-specific antibodies
Benefits
The estimated base salary range for this role is $177,000 - $235,000. Actual pay will be based on a number of factors including experience and qualifications. This position is also eligible for two annual cash bonuses.