Mid/Sr. Test Engineer TS/SCI Poly

Leidos has a new and exciting opportunity for a Mid-Senior Test Engineer in our Intel Sector's Cyber & Analytics Business Area (CABA). Our talented team is at the forefront in Security Engineering, Computer Network Operations (CNO), Mission Software, Analytical Methods and Modeling, Signals Intelligence (SIGINT), and Cryptographic Key Management. At Leidos, we offer competitive benefits, including Paid Time Off, 11 paid Holidays, 401K with a 6% company match and immediate vesting, Flexible Schedules, Discounted Stock Purchase Plans, Technical Upskilling, Education and Training Support, Parental Paid Leave, and much more. Join us and make a difference in National Security!  

Leidos is seeking a Mid-Senior Test Engineer to support a high-impact, multi-agency program serving the United States Space Force (USSF)/Space Systems Command (SSC), the United States Air Force (USAF), and other key mission stakeholders. The selected candidate will play an important role on a critical program focused on enhancing, testing, and deploying a large-scale Satellite Communications (SATCOM) system within an existing infrastructure. The ideal candidate will bring strong expertise in public key infrastructure (PKI) and Agile development, along with exceptional problem-solving, communication, and collaboration skills.

Primary Responsibilities:

• Collaborate with Senior Engineers and customer test stakeholders to define test priorities, align scope, and establish integrated test event schedules.

• Partner with System-Level Test Teams and Scrum Masters to assess tasking and resource requirements for test environment preparation, test procedure development, and execution of informal and formal test events.

• Drive the identification, tracking, and resolution of cross-team dependencies critical to the successful execution of program release test events.

• Serve as a key technical interface among software engineers, systems engineers, information assurance engineers, and other program stakeholders within an Agile Scrum environment.

• Apply Behavior Driven Development (BDD) practices within the program’s Agile framework to maintain engineering rigor, consistency, and quality across assigned efforts.

• Plan, execute, and oversee regression testing using the full suite of Operational Test Scenarios for customer-delivered builds and images.

• Engage with customer points of contact, as needed, to prepare for and support formal test milestones, including Test Readiness Reviews and Test Results Reviews, coordinate customer witnessing of formal tests, and ensure adequate test support for customer events.

• Develop, maintain, and deliver test artifacts and documentation, including Test Plans, Test Descriptions, and Test Reports.

• Collaborate with the Automated Test Development team when necessary and manage and monitor test automation within the continuous integration pipeline to support timely validation, issue identification, and reporting of test results.

Basic Qualifications:

• Bachelor’s degree in a technical field, and at least 8 years of related experience. Additional relevant work experience may be substituted for a degree.

• In-depth experience testing across the full system development life cycle, including development and implementation of test plans, test cases, and test processes.

• Demonstrated experience developing and executing formal system tests to verify compliance with customer requirements.

• Experience authoring detailed test procedures based on acceptance criteria derived from system and software requirements.

• Experience participating in formal test events, including Acceptance Test, User Acceptance Test, Software Final Release Test, and Maintenance Release Test.

• Experience collaborating with software developers to develop and refine formal test procedures.

• Proven ability to document test results in support of corrective actions, formal reporting, and audit activities.

• Hands-on experience designing and performing regression testing for software-based systems.

• Experience analyzing test data, using configuration management tools, and validating software applications.

• Demonstrated experience conducting test activities within an Agile Scrum environment.

• Experience working with physical equipment in a test lab environment.

• Experience collecting, analyzing, presenting, and reporting test results both verbally and in writing.

• Experience using elevated privileges to set up and execute manual test procedures.

• Experience testing systems against established system and functional specifications.

• Strong communication skills, with the ability to effectively interact with both management and technical personnel.

• Clearance Required: Must have TS/SCI with Polygraph.

Preferred Qualifications:

• Experience with Behavior Driven Development (BDD) and Test-Driven Development (TDD).

• Experience using automated test tools.

• Experience with programming and scripting languages (i.e., Java, shell, Python, etc).

• SAFe Agilist or DevOps certification.

• Experience working in an Agile Development Environment or on an Agile Team.

At Leidos, the opportunities are boundless. We challenge our staff with interesting assignments that allow them to thrive professionally and personally. For us, helping you grow your career is good business. We look forward to learning more about you – Apply today!

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:

September 12, 2026

Pay Range:

Pay Range $92,300.00 - $166,850.00

The Leidos pay range for this job level is a general guideline only and 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.