Senior Software Engineer (SWE-3)

Leidos LLC; Fort Meade (MD); On-site; USD 108,000 - 195,000; Full time

Benefits offered by this job

Paid Time Off

11 paid Holidays

401K with company match

Flexible Schedules

Discounted Stock Purchase Plans

Technical Upskilling

Education and Training Support

Parental Paid Leave

Job summary

Leidos seeks a Senior Software Engineer in the Intel Sector to lead the development of scalable analytics, prototype tools, and data-driven solutions. You will collaborate with data scientists and mission analysts to deliver impact across critical global challenges, advancing analytics and tradecraft in a fast-paced environment.

The role requires deep experience in big data, ML/AI, and modern software stacks, with a TS/SCI with Polygraph clearance.

Qualifications

• Bachelor's degree plus 11+ years of relevant experience or equivalent.
• Experience with data science, ML/AI, and LLMs is desirable.
• Active TS/SCI with Polygraph required.

Responsibilities

• End-to-end software engineering to prototype, develop, test, and deploy tools.
• Collaborate with data scientists and mission analysts on analytics at scale.
• Develop innovative analytic tools to operationalize data science.
• Work within Leidos corporate architecture and procedures.

Skills

Jupyter Notebooks

Java MapReduce

Python PySpark

Statistics

Machine Learning

Agile methodologies

Data analysis

Education

Bachelor's degree

Tools

Jira

Confluence

GitLab

Big Data architectures

Job description

Leidos has a new and exciting opportunity for a Senior Software Engineer in our Intel Sector. 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!

Job Summary: Our program provides our customer's Operations organization with the best possible solutions for their mission needs. We achieve this through rapid prototyping, new development, and advanced technology research. From leading-edge visualizations to analytic development, we're always pushing the boundaries to find new and better data sources and tradecraft to answer intelligence questions. With a focus on collaboration and a fast-paced environment, our prototype development program is the ideal place to grow your skills and make a real impact.

Click here to learn more about how this program “Delivers Mission Success!”

Seeking an experienced senior developer to create custom analytics to perform at scale. The software engineer will work closely with data scientists and end users to develop innovative analytic tools to further discovery and tradecraft around critical global challenges, then deliver innovative solutions focused on operationalizing data science.

Job Responsibilities/Qualifications:

• Mission Focus: Work directly with data scientists as well as mission analysts to solve the most demanding strategic problems; perform end-to-end software engineering to prototype, develop, integrate, test, and deploy tools and tradecraft into the customer’s corporate architecture.
• Technical Proficiency: Strong experience with Jupyter Notebooks, Java MapReduce, Python PySpark. Strong experience with statistical analysis and machine learning fundamentals, strong experience with customer tools, architecture, data flow, and use of big data. Proficiency with Jira, Confluence, Gitlab; experience with Agile methodologies.
• Qualifications: Bachelor's degree plus eleven (11) years of relevant experience or equivalent.
• Security Clearance: Must possess an active TS/SCI with Polygraph to be considered for this role.
• Desirable Skills: Experience with software development processes (i.e., requirements analysis, software design, implementation, testing, integration, deployment/installation, and maintenance) and programming. Experience with Data Science, Machine Learning (ML), Artificial Intelligence (AI) and using Large Language Models (LLM’s).

Pay Range:

Pay Range $107,900.00 - $195,050.00

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.

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.

Securing Your Data

Leidos will never ask you to provide payment-related information at any part of the employment application process. And Leidos will communicate with you only through emails that are sent from a Leidos.com email address. If you receive an email purporting to be from Leidos that asks for payment-related information or any other personal information, please report the email to [e-mail].

Commitment and Diversity

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.

For more information, visit www.Leidos.com.

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.

Original Posting: February 4, 2026

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 $17.2 billion for the fiscal year ended January 2, 2026.