Backend Software Engineering jobs in Fairfax

CACI International

Job Title: Software Engineering Job Category: Engineering Time Type: Full time Minimum Clearance Required to Start: TS/SCI with Polygraph Employee Type: Regular Percentage of Travel Required: None Type of Travel: None Anticipated Posting End: 7/31/2026 The Opportunity: CACI is seeking a talented and

CACI International Inc

Job Title: Software Engineering Job Category: Engineering Time Type: Full time Minimum Clearance Required to Start: TS/SCI with Polygraph Employee Type: Regular Percentage of Travel Required: None Type of Travel: None Anticipated Posting End: 7/31/2026 The Opportunity CACI is seeking a talented and

CACI International Inc

Job Title: software engineering Job Category: Engineering Time Type: Full time Minimum Clearance Required to Start: TS/SCI with Polygraph Employee Type: Regular Percentage of Travel Required: None Type of Travel: None Anticipated Posting End: 7/31/2026 The Opportunity CACI is seeking a talented and

Vantor

$11,417 - $19,000 /month

Vantor is forging the new frontier of spatial intelligence, helping decision makers and operators navigate what’s happening now and shape what’s coming next. Vantor is a place for problem solvers, changemakers, and go-getters—where people are working together to help our customers see the world diff

Steampunk, Inc.

$85,000 - $170,000 /year

As a Backend Software Engineer, you will work on modernizing legacy enterprise systems by decomposing monolithic Java and .NET services into cloud-native Python microservices. This role is centered on Python development. You will design and deploy lightweight REST APIs and batch processing jobs acro

## **Please review the job details below.** This position requires an active U.S. Government Security Clearance at the TS/SCI level with CI Polygraph. The Back-end Developer will work independently and as part of a cross-functional team comprised of technical experts supporting an established and gr

Leidos

Description If you've spent the last few years building your expertise in backend engineering, Java or Python development, and mission-driven systems , and you're ready for work that actually moves the needle, this is the kind of opportunity cleared engineers pursue when they want real impact . If y

Swoop Technologies

$10,417 - $15,833 /month

About Swoop: Swoop Technologies has a mission to organize and make accessible the world’s military and critical infrastructure. We are building a distributed operating system, SwoopOS, that decomposes the world’s equipment into a distributed robotic embodiment upon which a new generation of distribu

Backend Engineer We're looking for a backend engineer who's excited to build the infrastructure behind cutting-edge AI development tools. Under the hood, Braintrust is a real-time, high-availability data platform that operates in both SaaS and self-hosted environments. You'll help scale our ingestio