Software Engineer Subject Matter Expert (SME)

Job overview

The Software Engineer Subject Matter Expert (SME) is an onsite role based in Belleville, IL, with a salary range of $131,300 to $237,350 per year. This position supports the Chinook Program, contributing to critical national security objectives for an Intelligence Community customer. This role serves as a senior technical authority responsible for the full software development lifecycle, including design, development, integration, and maintenance of mission-critical applications. The SME provides technical leadership, mentors junior engineers, and ensures the implementation of robust, scalable, and secure software solutions.

What you'll do

• Serve as senior technical advisor for mission applications
• design and develop modern web applications and backend services
• provide technical leadership in architecture and coding standards
• develop RESTful APIs and microservices
• optimize database schemas
• troubleshoot complex performance issues
• support CI/CD and DevSecOps practices
• mentor engineering staff.

What we're looking for

Skills & competencies

full-time

software engineer

sme

belleville il

top secret sci

intelligence community

agile

devsecops

cloud

java

python

$131k-$237k

Work arrangement

• Weekend coverage required

Benefits & perks

• Competitive compensation, Health and Wellness programs, Income Protection, Paid Leave, and Retirement.

Why this role

Requires active Top Secret/SCI clearance with polygraph; focuses on high-impact intelligence mission support.

About the employer

Leidos is hiring for this role. Industry: Computer Systems Design Services. Sector: 54.