Description
The Undersea Systems Division at Leidos currently has an opening for a Senior Mechanical Engineer/Technical Writer for an existing and growing program. Candidate will join a fast-paced engineering group rapid-prototyping unresolved and emergent requirements for a critical Department of Defense project managed by the Naval Information Warfare Center (NIWC) Pacific. It provides deployable radiation sensors and monitoring systems to counter Weapons of Mass Destruction (WMD) across land, maritime, and aerial environments.
Primary Responsibilities:
Translate complex engineering specifications, sensor capabilities, and system behaviors into user-friendly language while preserving technical precision.
Develop and maintain technical documentation for radiation detection and monitoring systems with little support from the sensor designer
Document system architectures, interfaces, workflows, and data pathways for radiation sensing
Support updates to documentation as system hardware, firmware, and software evolve across RADIAC product lines.
Ensure all documents comply with DoD, Navy, and NIWC Pacific standards, including required formatting, terminology, and security markings
Produce briefs, fact sheets, and stakeholder-facing communications that describe mission @context, operational capabilities, and deployment scenarios.
Manage version control for technical documents and ensure proper storage within approved configuration management systems
Review and edit existing documentation for clarity, consistency, and compliance with RADIAC program requirements
Basic Qualifications
U.S. Citizen with ability to obtain SECRET security clearance.
Knowledge of Systems engineering principles, including system architectures, interface control, requirements traceability, and configuration management.
Ability to read, understand, and interpret complex technical documents.
Ability to communicate complex ideas in writing, orally and visually.
Preferred Qualifications
Basic familiarity with radiation detection technologies, fielded sensing systems, and environmental monitoring principles
Knowledge of test and evaluation processes for complex DoD systems, including developmental testing, operational testing, and verification/validation methodologies.
Knowledge of test facility design, operations, and maintenance (O&M), especially for radiation sensing, environmental simulation, or specialized instrumentation labs
Knowledge of DoD-specific documentation standards, technical writing practices, security classification guidance, and formatting requirements.
Ability to translate engineering notes, phone calls, schematics into technical documentation for high level management.
If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo - because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 - and moving faster than anyone else dares.
Original Posting:
July 21, 2026
For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.
Pay Range:
Pay Range -
The Leidos pay range for this job level is a general guideline onlyand not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.
About Leidos
Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit www.Leidos.com .
Pay and Benefits
Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available at www.leidos.com/careers/pay-benefits .
Securing Your Data
Beware of fake employment opportunities using Leidos' name. Leidos will never ask you to provide payment-related information during any part of the employment application process (i.e., ask you for money), nor will Leidos ever advance money as part of the hiring process (i.e., send you a check or money order before doing any work). Further, Leidos will only communicate with you through emails that are generated by the Leidos.com automated system - never from free commercial services (e.g., Gmail, Yahoo, Hotmail) or via WhatsApp, Telegram, etc. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at LeidosCareersFraud@leidos.com .
If you believe you are the victim of a scam, contact your local law enforcement and report the incident to the U.S. Federal Trade Commission (https://reportfraud.ftc.gov/#/) .
Commitment to Non-Discrimination
All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.
Remote
REQNUMBER: R-00187613
All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or veteran status. Leidos will consider qualified applicants with criminal histories for employment in accordance with relevant Laws. Leidos is an equal opportunity employer/disability/vet.
