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Proxima

Principal Biologist

Proxima

Biologist designing and executing cell-based pharmacology assays for proximity drug discovery at Proxima. Collaborating with computational scientists and managing external partnerships in a fast-paced environment.

Posted 6/29/2026full-timeBoston • Massachusetts • 🇺🇸 United StatesLeadWebsite

About the role

Key responsibilities & impact
  • Design and execute cell-based pharmacology assays to evaluate proximity-inducing compounds (degraders, molecular glues, stabilizers)
  • Manage CRO relationships for outsourced assays and run high-priority experiments in-house
  • Characterize compound activity profiles: dose-response, kinetics, selectivity, mechanism of action, and SAR at the cellular level
  • Build and validate disease-relevant cellular models (engineered cell lines, primary cells, co-culture systems) for target validation and translational pharmacology
  • Develop and optimize quantitative assay readouts including high-content imaging, flow cytometry, reporter systems, and multiplexed approaches
  • Collaborate with computational scientists and the XLMS platform team, providing biological feedback to improve ML model predictions and data generation priorities
  • Prepare data packages for internal decision-making, BD/partnership discussions, and due diligence

Requirements

What you’ll need
  • PhD in cell biology, pharmacology, molecular biology, or a related discipline
  • 3–8 years of post-PhD experience in a biotech or pharma drug discovery environment, ideally in proximity biology, targeted protein degradation, or molecular glue programs
  • Deep hands-on expertise in designing and executing cell-based pharmacology assays (degradation assays, ternary complex formation, ubiquitination, reporter systems)
  • Experience with quantitative cellular techniques: high-content imaging, flow cytometry, AlphaLISA/HTRF, NanoBRET, Western blot, ELISA, and/or proteomics-based approaches (TMT, global proteomics)
  • Track record of working at the interface of computational predictions and experimental validation
  • Comfortable working in a fast-paced, resource-constrained environment where you own the experimental design end to end
  • Strong scientific communication skills; able to present data clearly to computational and medicinal chemistry and biology audiences.

Benefits

Comp & perks
  • Health insurance
  • Flexible work arrangements
  • Professional development opportunities

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools
Cell-Based AssaysQuantitative TechniquesDegradation AssaysTernary Complex FormationUbiquitinationReporter SystemsAlphaLISAHTRFNanoBRETProteomics
Soft Skills
Scientific CommunicationData Presentation