Based in the San Francisco / Bay area, RefleXion Medical is developing the first biological-guided radiation therapy system for treating metastatic cancer. By uniquely leveraging Positron Emission Tomography (PET), RefleXion's patented technology uses signals that are continuously emitted from the tumor itself to guide the treatment beam, enabling the systemic treatment of multiple moving tumors in the body with ablative radiotherapy.  

Systems Physicist/Research Dosimetrist will be part of the Product Engineering group, a multi-disciplinary team of radiotherapy use experts. This team will work with the design engineers and outside clinicians to define, develop, and validate the clinical performance of new RefleXion biology-guided radiation therapy products. The team will focus on establishing the clinical requirements for the products and validating that the products address them. Successful candidate will need a strong background in radiation physics, radiation therapy, treatment planning, diagnostic imaging and medical device design control. Systems Physicist/Research Dosimetrist will develop deep relationships with key opinion leaders in cancer treatment and in investigating and developing new high-value clinical applications for RefleXion’s products, contributing to the larger radiotherapy, radiology and oncology communities.

This position is a hands-on role. The Systems Physicist/Research Dosimetrist will be expected to understand medical device quality systems and design control, including specification, hazard analysis, and formal testing. This position will engage the team on any and every issue necessary to ship products to customers of the highest quality and reliability.


  • Investigate the performance of treatment planning software under development by creating and analyzing clinical treatment plans in accordance with standard clinical practices and protocols
  • Develop and maintain a HIPAA compliant clinical data repository
  • Conceptualize and execute medical physics projects to validate the clinical performance of RefleXion biology-guided radiation therapy system
  • Develop tools to simulate and evaluate system performance under various clinical and practical test conditions – covering imaging, dosimetry, tracking, system throughput and other key performance parameters.
  • Develop technical requirements and specifications from the simulations to ensure that RefleXion’s products meet their clinical performance goals
  • Develop protocols and conduct formal testing to validate the clinical safety and efficacy of the product
  • Support Regulatory (FDA, CE, …) documentation and applications
  • Collaborate with other organizations within the company as needed i.e. regulatory, product education. training, sales and marketing
  • Collaborate with clinical partners and KOL’s in the industry to develop protocols and criteria for acceptance and clinical utilization of Reflexion systems
  • Publish system evaluation and clinical performance papers in collaboration with clinical partners, KOL’s, and internal R&D partners


  •  MS or PhD degree in Physics or Engineering with relevant clinical and research work experience.  Certified Medical Dosimetrist with relevant clinical and research or commercial work experience may also be considered.
  • Clinical experience, particularly in radiation therapy or radiosurgery, and strong background and radiation physics and diagnostic imaging is highly desirable
  • ­Well-versed with multi-modality imaging and image fusion; PET/CT preferred
  • Working knowledge of basic DICOM and DICOM-RT is highly desirable
  • Ability to program in Matlab or equivalent language for simulation and data analysis is highly desirable
  • Strong background in computational algorithms, data structures, computer systems engineering is highly desirable
  • Keen aptitude to work as part of a cross-functional product development team to move successful products from concept through launch
  • Experience with QA methodologies for medical imaging and radiation therapy is highly desirable
  • Excellent communicator with strong written and oral presentation skills
  • Must be a self-starter and work with minimal supervision
  • Experience with design control process for medical devices is highly desirable
  • A passion for innovation leading to creation of robust and reliable products

Apply for this Job

* Required


U.S. Equal Opportunity Employment Information (Completion is voluntary)

Individuals seeking employment at RefleXion Medical are considered without regards to race, color, religion, national origin, age, sex, marital status, ancestry, physical or mental disability, veteran status, gender identity, or sexual orientation. You are being given the opportunity to provide the following information in order to help us comply with federal and state Equal Employment Opportunity/Affirmative Action record keeping, reporting, and other legal requirements.

Completion of the form is entirely voluntary. Whatever your decision, it will not be considered in the hiring process or thereafter. Any information that you do provide will be recorded and maintained in a confidential file.

Race & Ethnicity Definitions

If you believe you belong to any of the categories of protected veterans listed below, please indicate by making the appropriate selection. As a government contractor subject to Vietnam Era Veterans Readjustment Assistance Act (VEVRAA), we request this information in order to measure the effectiveness of the outreach and positive recruitment efforts we undertake pursuant to VEVRAA. Classification of protected categories is as follows:

A "disabled veteran" is one of the following: a veteran of the U.S. military, ground, naval or air service who is entitled to compensation (or who but for the receipt of military retired pay would be entitled to compensation) under laws administered by the Secretary of Veterans Affairs; or a person who was discharged or released from active duty because of a service-connected disability.

A "recently separated veteran" means any veteran during the three-year period beginning on the date of such veteran's discharge or release from active duty in the U.S. military, ground, naval, or air service.

An "active duty wartime or campaign badge veteran" means a veteran who served on active duty in the U.S. military, ground, naval or air service during a war, or in a campaign or expedition for which a campaign badge has been authorized under the laws administered by the Department of Defense.

An "Armed forces service medal veteran" means a veteran who, while serving on active duty in the U.S. military, ground, naval or air service, participated in a United States military operation for which an Armed Forces service medal was awarded pursuant to Executive Order 12985.

Form CC-305

OMB Control Number 1250-0005

Expires 05/31/2023

Voluntary Self-Identification of Disability

Why are you being asked to complete this form?

We are a federal contractor or subcontractor required by law to provide equal employment opportunity to qualified people with disabilities. We are also required to measure our progress toward having at least 7% of our workforce be individuals with disabilities. To do this, we must ask applicants and employees if they have a disability or have ever had a disability. Because a person may become disabled at any time, we ask all of our employees to update their information at least every five years.

Identifying yourself as an individual with a disability is voluntary, and we hope that you will choose to do so. Your answer will be maintained confidentially and not be seen by selecting officials or anyone else involved in making personnel decisions. Completing the form will not negatively impact you in any way, regardless of whether you have self-identified in the past. For more information about this form or the equal employment obligations of federal contractors under Section 503 of the Rehabilitation Act, visit the U.S. Department of Labor’s Office of Federal Contract Compliance Programs (OFCCP) website at

How do you know if you have a disability?

You are considered to have a disability if you have a physical or mental impairment or medical condition that substantially limits a major life activity, or if you have a history or record of such an impairment or medical condition.

Disabilities include, but are not limited to:

  • Autism
  • Autoimmune disorder, for example, lupus, fibromyalgia, rheumatoid arthritis, or HIV/AIDS
  • Blind or low vision
  • Cancer
  • Cardiovascular or heart disease
  • Celiac disease
  • Cerebral palsy
  • Deaf or hard of hearing
  • Depression or anxiety
  • Diabetes
  • Epilepsy
  • Gastrointestinal disorders, for example, Crohn's Disease, or irritable bowel syndrome
  • Intellectual disability
  • Missing limbs or partially missing limbs
  • Nervous system condition for example, migraine headaches, Parkinson’s disease, or Multiple sclerosis (MS)
  • Psychiatric condition, for example, bipolar disorder, schizophrenia, PTSD, or major depression

1Section 503 of the Rehabilitation Act of 1973, as amended. For more information about this form or the equal employment obligations of Federal contractors, visit the U.S. Department of Labor's Office of Federal Contract Compliance Programs (OFCCP) website at

PUBLIC BURDEN STATEMENT: According to the Paperwork Reduction Act of 1995 no persons are required to respond to a collection of information unless such collection displays a valid OMB control number. This survey should take about 5 minutes to complete.