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Software Developer (Senior)

SOS International LLC (SOSi)Chantilly, VA🇺🇸United StatesPosted Sep 23, 2026

Why This Role Stands Out

This Senior Software Developer role at SOSi offers significant growth potential through leading complex projects and mentoring junior developers within a reputable defense and government solutions business. You'll thrive if you possess a strong technical background, a desire to drive innovation, and an active TS/SCI clearance, allowing you to make a tangible impact in a hybrid work environment. Apply today to join a team dedicated to advanced technology and mission support.

Quick Overview

Seniority
Mid Senior
Work mode
Hybrid
Location
Chantilly, VA, United States
Posted
Yesterday

Job Description

Company Description
Founded in 1989 and headquartered in Reston, Virginia, SOSi is a private defense and government solutions business specializing in advanced technology systems and mission support. Its capabilities include data science, software development, network engineering, intelligence, surveillance, and reconnaissance (ISR), and logistics.
Job Description
*Position is contingent upon contract award*
SOSi is seeking a Software Developer to support our government customer in Chantilly, VA.
Essential Job Duties
  • Lead design and development of complex software solutions writing clean, efficient code.
  • Mentor junior developers.
  • Conduct architectural reviews.
  • Integrate COTS, GOTS, and Open-Source components.
  • Drive continuous improvement in development processes.

Qualifications
  • Active in scope TS/SCI w/ Poly.
  • Minimum 7+ years of relevant experience.
  • Understanding of the Sponsor's technical environment.
  • Experience in full lifecycle software engineering.
  • Experience moving capabilities from development through testing to production environments.

Additional Information
Working Conditions
  • Office environment.

Working at SOSi
All interested individuals will receive consideration and will not be discriminated against for any reason.

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