Senior Principal Scientist

## Senior Principal Scientist Apply locations:
Cambridge, MAtime type:
Full time posted on:
Posted Todaytime left to apply:
End Date:
September 16, 2026 (30+ days left to apply) job requisition :
R2857792
** Job title**:
* Senior Principal Scientist*
*
* Location:

Cambridge, MA
*** About the Job
** We are seeking a highly motivated Senior Principal Scientist to spearhead the execution and expansion of our mast cell disorders Research & Development pipeline.  A successful candidate will have deep expertise in hematopoietic stem cell biology with a particular focus on mast cell disorders and related immune disorders in the context of rare diseases. This individual will work cross-functionally to identify and shepherd early-stage programs into the research pipeline, through internal and external innovation, and ensure the successful progression of development stage programs through the clinic to registration by providing deep research subject matter expertise.

In parallel, the candidate will build relationships with key opinion leaders in the field and work to source disease relevant cell lines, models, and patient samples and work with research and translational sciences to expedite internal research and accelerate later-stage research programs.

Join the engine of Sanofi’s mission — where deep immunoscience meets bold, AI-powered research. In R&D, you’ll drive breakthroughs that could turn the impossible into possible for millions.
** About Sanofi:
** We’re an R&D-driven, AI-powered biopharma company committed to improving people’s lives and delivering compelling growth. Our deep understanding of the immune system – and innovative pipeline – enables us to invent medicines and vaccines that treat and protect millions of people around the world. Together, we chase the miracles of science to improve people’s lives.
*
* Main Responsibilities:

*** Serve as subject matter expert for mast cell disorders and related rare immune and hematologic conditions, providing scientific leadership and strategic guidance.
* Drive early discovery initiatives by directing target identification, mechanistic biology research, and preclinical strategy development for first-in-class and best-in-class rare disease therapeutics.
* Initiate and lead new preclinical programs to strategically expand the rare disease pipeline and advance innovative treatment options.
* Identify and leverage cross-portfolio synergies with rare blood disorders and hematopoietic stem cell programs to maximize therapeutic opportunities and optimize resource allocation.
* Monitor competitive landscape and establish strategic partnerships through targeted academic collaborations and business development initiatives.
* Partner cross-functionally with Clinical and Business Development teams to develop indication expansion and lifecycle management strategies, supporting comprehensive portfolio development from discovery through commercialization.
* Contribute to organizational excellence through strategic planning, executive communications, scientific publications, and regulatory submissions that advance company objectives.
** About You
*
* Basic Qualifications:

* Earned Ph.D. in molecular biology, cellular biology, hematology, immunology, or related discipline PLUS at least 7 years research experience in biopharmaceutical setting.
* Experience in hematopoietic stem cell and mast cell research, including systemic mastocytosis.
* Experience in early and late-stage research.

Preferred Qualifications:

* Track record of scientific publications and external visibility (e.g., scientific publications, conference presentations)
* Experience in translational research and drug development.
* The candidate is expected to have a strong network of research and clinician colleagues to leverage for collaboration and insight.
* Strong understanding of emerging science, leading therapeutic approaches and competitive landscapes for HSC and mast cell disorders, particularly in the rare disease space.
* Familiarity and/or experience with broad range of cell-based and animal models of HSC and mast cell disorders and relevant readouts.
* Familiarity with wide range of therapeutic modalities including…