Senior Software Developer - TS/SCI Clearance Required

Description

The Mission Solutions Business Area at Leidos seeks a Software Engineer to lead the creation of new software capabilities within a matrixed research and development organization. This position will be responsible for designing and developing browser-based applications, backend data ETL, 3D modeling, and AI integration. This position requires advanced knowledge (at least 12 years) of computer science, application development, requirements collection, system design, data analysis, test, simulation, and verification of software simulation or decision systems. A successful applicant will be able to write various coding languages (for example: Java, C++, Python, R, JavaScript, HTML), construct enterprise solutions using multi-level architectures, containerization, cloud services, database systems, and COTS integration (for example: JBoss, Tomcat, MySQL, PostgreSQL, MongoDB, Docker).

A successful applicant will also need to mentor and lead teams of other subject matter experts, guiding and teaching junior and mid-level resources in the process of defining new systems to achieve specific research and development goals.

This software development position leads activities and performs them. It is a critical role within multiple active R&D projects. The focus of this position is on the creation of new, novel, and imaginative approaches to solving difficult analytical, modeling, and engineering challenges within the government problem domain.

Required clearance:

Candidates for consideration must possess an active and in-scope Top Secret clearance with the ability and willingness to obtain SCI and Polygraph after start. The program may consider sponsoring a clearance upgrade for the right candidate that holds another lower level US government security clearance as a starting point. This position requires US citizenship.

Required Education, Skills, and Experience:

• BS degree in Computer Science, Information Systems, Systems Engineering, or relevant systems or science discipline and 12+ years of experience or Masters degree and 10+ years of experience.

• 3+ years' experience in the intelligence and/or DoD communities

• 5+ years' experience with software development

• 5+ years' Java experience, building HTML/JavaScript (eg. Angular) user interfaces, data storage back ends in json, sql, or no-sql databases. Experience building simulation "gameboards" and scenario-design tools

• 3+ years' experience delivering tools or solutions to end users, guiding them through adaptation, and working through emerging requirements.

• 3+ years' experience with detailed Agent-Based simulations, formatting input or post-processing output.

• Ability to conceive of, prototype, and present new analytic tools that deal with qualitative and user survey collected data as well as geospatial, numeric, and scientific data and programming

• Capability to execute Extract-Transform-Load (ETL) scripting, build custom scripts, generate docker containers, and collect data within both a Windows and a Linux/Unix environment

• Ability to work closely with users to design, build, prototype, and deploy software systems within highly managed government environments

• Experience documenting software systems using Word, PowerPoint, or in-line video help

• Experience explaining or teaching software systems in a meeting or conference setting

• Ability to work individually, as well as within a larger team construct

• Excellent technical writing, communication, and customer relation skills

• Highly detailed oriented

• Adept at working in a fast-paced environments

• Ability to resolve complex, unclear problems and issues with research and nontraditional solutions

• Expert in creating briefs and documents using Microsoft office

Desired Technical Qualifications:

• MS in degree in Computer Science, Information Systems, Systems Engineering, or relevant systems or science discipline

• Experience with Artificial Intelligence and Machine Learning

• Working knowledge of the Defense Threat Reduction Agency (DTRA) - Research & Development Directorate

• Experience working with Combatant Commands

• Ability to work closely with users to design, build, prototype, and deploy software systems within highly managed government environments

• COTS integration experience to include 3D modeling tools, simulation applications, and visualization tools.

• Ability to design and build software systems "from scratch"

• Experience to documenting software systems and explaining or teaching software systems in a meeting or conference setting

• Experience delivering tools or solutions to end users, guiding them through adaptation, and working through emerging requirements

• A history of working with detailed Agent-Based simulations, formatting input or post-processing output would be preferred.

• A history of using MASON simulation library especially valuable.

At Leidos, we don't want someone who "fits the mold"-we want someone who melts it down and builds something better. This is a role for the restless, the over-caffeinated, the ones who ask, "what's next?" before the dust settles on "what's now."

If you're already scheming step 20 while everyone else is still debating step 2... good. You'll fit right in.

Original Posting:

September 3, 2025

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 $126,100.00 - $227,950.00

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.

REQNUMBER: R-

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.