Principal Associate/Scientist I, Process Development-Upstream

Process Development

San Diego, CA

Summary Description
PaxVax, Inc. is seeking a Principal Associate or Scientist I to join the Process Development and Clinical Production department. The successful candidate will be expected to work as part of a team that is focused on the process development for vaccine development from preclinical through Phase III, and commercialization. The main responsibilities will include the design, execution, and documentation of experiments to develop/optimize upstream (bioreactor, transfection, microfiltration, filtration) for clinical supply production and to scale up these processes to enable transfer of robust processes to the commercial space. The successful candidate will be able to work in a fast-paced team environment and be able to learn new skills quickly. The candidate at PaxVax will be a key member of the Process Development team and will report to the Sr. Scientist/Manger, Process Development.


The candidate will be in a process development and clinical manufacturing team. The candidate will focus on the development work of upstream cell culture and virus amplification/virus-like-particles transfection with disposable bioreactors, and support downstream purification with Chromatography method.

  • Develop and optimize the cell culture parameters (for various cell lines) and nutrient requirement in shaker flasks and disposable bioreactors (10L, 50L and 200L) for mammalian suspension cell growth for Virus and virus like particle
  • Develop and optimize the viral amplification/virus-like-particle transient transfection process to maximize the
  • Develop and optimize the microfiltration process to concentrate the cells for viral amplification/virus-like-particle transient transfection.
  • Use DOE software to design the experiment, analyze the results for the virus/virus-like-particle yield
  • Write technical reports and transfer the method and work with clinical production team to support/generate the SOPs/batch record and produce the clinical trial
  • Support investigational new drug (IND) chemistry-manufacturing-control (CMC) section
  • Support downstream purification team for the development work (tangential flow filtration, anion exchange chromatography purification and sterile filtration) and clinical trial material production as
  • Guide/train junior level associates

Technical Skills and Knowledge:

  • Cell culture experience is
  • Bioreactor experience is necessary
  • Design of Experiment (DoE) is necessary
  • Electroporation experience is preferred
  • Anion Exchange Purification experience is preferred
  • Diafiltration/Ultrafiltration experience is preferred
  • Good data analysis skills
  • cGMP experience is preferred
  • Molecular biology and virology knowledge is preferred
  • Good aseptic techniques
  • Good writing skills

Qualification Requirements:

  • Minimum of 2 years of experience in the mammalian cell culture and bioreactor experience
  • Degree in chemistry, biochemistry, pharmaceutical sciences, chemical engineering or a related field
  • MS degree with over 3 three years’ industrial experiences or Ph.D. degree with 0-2 years’ industrial experiences are required.
  • Excellent written and verbal communication skills required.
  • Record of successful publication is a plus


  • Minimum travel