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Salary
$94k – $198k per year
Location
In office (Fort Belvoir)
Seniority
Staff · 10+ years exp
Employment
Full-Time

Confirmed on the employer's own hiring board on Nov 13, 2026. First seen by Alion on Nov 12, 2026. CACI International scores D on the Alion truth index.

Overview
Company
Impact
Profile match
CACI International is an American technology company founded in 1962 that works almost entirely for United States defence, intelligence and federal civilian agencies. It has moved from being a conventional IT services contractor toward supplying its own technology, with a substantial expeditionary electronic warfare and signals intelligence product line, photonics and optical communications for space, and secure network modernisation. Headquartered in Reston, Virginia, the company employs more than twenty thousand people, the majority holding security clearances, and has grown through a steady programme of acquisitions that add differentiated technology rather than headcount alone.
Job Title: PhysicistJob Category: EngineeringTime Type: Full timeMinimum Clearance Required to Start: SecretEmployee Type: RegularPercentage of Travel Required: NoneType of Travel: None* * *

The Opportunity:

As a Physicist you will support defense analytical requirements with enhanced scientific research, capability/limitation analysis, reverse engineering analysis/ characterizations, facility, and vulnerability assessments. This includes, but is not limited to, applied and interdisciplinary fields of physics such as astrophysics, biophysics, directed energy weapons, and/ or geophysics. You will conduct independent research, technical writing, modeling, and overseeing/ consulting with allied engineering disciplines on, but not limited to, the areas of fiber optics, acoustics, semiconductors, lasers, weapons development, and testing and / or identifying the characteristics of hard and deeply buried targets. Prepares products to describe and document findings and activities.

Responsibilities:

  • You will get to demonstrate an in-depth knowledge and understanding of physics and system engineering.
  • You will get to demonstrate your mastery of qualitative and quantitative analytic methodologies and pursue developments in academia or other fields that affect tradecraft methodology.
  • You will demonstrate the ability to define comprehensive, new, or unique research approaches that enable rigorous assessments to address and contribute to high-level tasks.
  • You will use your in-depth analysis of analytic operations and knowledge management issues across organization and intra-IC boundaries and clearly articulate key findings in relation to physics.
  • You will use your ability to review analytic products for cogent arguments, tradecraft standards, and adequate support for conclusions and routinely test analytic rigor of products.

Qualifications:

Required:

  • Security Level: Requires Secret to start with ability to obtain TS/SCI
  • Bachelor’s degree in related field (physics, nuclear physics, quantum physics, biophysics, etc.) from a college or university accredited by an agency recognized by the U.S. Department of Education.
  • Desired Experience: Minimum 5 years of experience in the field of physics with at least a portion of the experience within the last 2 years relevant to physics and defense applications.
  • You must also possess the ability to effectively communicate both orally and in writing.
  • Willing to work rotating shifts if needed - that may include nights and weekends.

Desired:

  • Security Level: TS/SCI
  • Master’s degree in related field (nuclear physics, quantum physics, biophysics, etc.) from a college or university accredited by an agency recognized by the U.S. Department of Education.
  • Desired Experience: Minimum 10 years of experience in the field of physics with at least a portion of the experience within the last 5 years relevant to physics and defense applications.
-

What You Can Expect:

A culture of integrity.

At CACI, we place character and innovation at the center of everything we do. As a valued team member, you’ll be part of a high-performing group dedicated to our customer’s missions and driven by a higher purpose - to ensure the safety of our nation.

An environment of trust.

CACI values the unique contributions that every employee brings to our company and our customers - every day. You’ll have the autonomy to take the time you need through a unique flexible time off benefit and have access to robust learning resources to make your ambitions a reality.

A focus on continuous growth.

Together, we will advance our nation's most critical missions, build on our lengthy track record of business success, and find opportunities to break new ground - in your career and in our legacy.

Pay Range:

There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. Our employees value the flexibility at CACI that allows them to balance quality work and their personal lives. We offer competitive compensation, benefits and learning and development opportunities. Our broad and competitive mix of benefits options is designed to support and protect employees and their families. At CACI, you will receive comprehensive benefits such as; healthcare, wellness, financial, retirement, family support, continuing education, and time off benefits.

The proposed salary range for this position is:

$94,400 - $198,200

CACI is an Equal Opportunity Employer.All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, age, national origin, disability, status as a protected veteran, or any other protected characteristic.

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