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Added 11 hours ago
Sr. AWS Cloud Architect
Peraton
Remote, United States
US citizenship required; ability to obtain and maintain a Top-Secret eligible clearance
Added 11 hours ago
Senior Cloud Developer - Legacy Migration (Secret Clearance/TS Elgible)
GD Information Technology, Inc.
United States
Candidates MUST have an active Secret clearance with ability to obtain Top Secret and an agency-specific suitablity.
Added 11 hours ago
Full Stack Developer (Secret Clearance/TS Elgible)
GD Information Technology, Inc.
United States
Candidates MUST posess an active Secret Clearance and be eligible to obtain Top Secret clearance and agency-specific suitability.
Added 11 hours ago
GA
Senior Software Developer NET PL SQL TS/SCI
Geospatial And Cloud Analytics Inc
Qua, VA
- $191,000 USD / year
We are seeking a highly skilled Software Developer Subject Matter Expert (SME) to join our team supporting the Naval Criminal Investigative Service (NCIS) in Quantico, VA. The ideal…
Added 12 hours ago
Software Developer
LEIDOS, INC.
San Antonio, TX
Must have an active DoD Secret clearance with the ability to obtain a Top Secret /SCI.
Added 12 hours ago
C# .NET Software Developer
Atlas Technologies Inc
North Charleston, SC
…customers in support of America's warfighters, is seeking a C# .NET Software Developer in Charleston, SC, to serve as a developer for a major Navy system. You will primarily use C# and…
Added 15 hours ago
A
Software Test Engineer
Actalent
Huntsville, AL
- $49.95 to $93.47 USD / hour
Ability to obtain and maintain an active Secret security clearance.
Added 15 hours ago
Software/Web Developer (SharePoint) – TS/SCI required
GD Information Technology, Inc.
United States
Advance how our customers operate while you advance your career. Join GDIT as a Software/Web Developer (SharePoint) Associate and build an impactful career in enterprise IT, collaborating…
Added 16 hours ago
Software Developer SME (SIPR Case Management Systems) – TS/SCI
Xcelerate Solutions
Remote, United States
Xcelerate Solutions is seeking a Software Developer SME SIPR. Who will assist with the modernization of NCIS’s case management for classified networks.
Added 16 hours ago
Software Developer SME (Containerized Applications Specialist) – TS/SCI
Xcelerate Solutions
Remote, United States
Design, develop, implement, and maintain enterprise software applications using .NET technologies to support mission-critical systems and operational requirements.
Added 17 hours ago
Microsoft .NET Software Engineer
ASRC Federal
MI · MA · RI · AL · AK · OK · NV · NY · MS · SC · OH · IA · NE · ME · NH · UT · KY · TN · SD · ID · AR · KS · WI · IN · WY · PA · LA · ND · VT · OR · IL · MN · CT · DE · MD · VA · Washington, DC · NJ · NC · HI · FL · MT · GA · MO · CA · WA · CO · TX · AZ · WV · NM
ASRC Federal Technology Solutions LLC, a subsidiary of ASRC Federal, is seeking a Software Engineer with a minimum of a Secret security clearance and strong Microsoft .NET experience to…
Added 1 day ago
DevOps Engineer
Jobgether
Remote, United States
Eligibility to obtain a SECRET security clearance is highly preferred.
Added 1 day ago
IT Applications Senior Developer
Jobgether
Remote, United States
…and monitoring operations. You will build and maintain modern .NET applications, APIs, and integrations while helping shape the technical architecture behind essential business systems.…
Added 1 day ago
Senior Software Engineer
CACI International
Washington, DC
Design, build, and maintain full-stack applications using modern technologies such as React, TypeScript, NodeJS, Python, and .NET
Added 1 day ago
SI
Senior Application Developer
SOS International LLC
Fort Belvoir, VA
- $140,000 to $155,000 USD / year
SOSi is seeking a highly qualified Senior Application Developer to join our team 100% on site in Fort Belvoir, VA , in support of our government customer. In this role, the Senior…
Added 2 days ago
ICBM Futures- SW Engineering Lead
BAE Systems
Hill AFB, UT
…excellence to the Government. BAE Systems has been recognized as a “Top Workplace” in Utah for seven consecutive years, earning special distinction for providing a healthy work-life balance…
Added 2 days ago
Software Engineering Manager – C# & Oracle Development
GD Information Technology, Inc.
United States
The Software Engineering Manager leads a team of C#/.NET developers supporting complex, mission-critical enterprise applications. This position combines hands-on technical leadership with…
Added 2 days ago
Application Security Architect, Information Technology
ServiceLink
Remote, United States
…next-generation software delivery practices. We empower the nation's top lenders and financial institutions with advanced technology, data-driven insights, and high-velocity product…
Added 2 days ago
Senior Software Engineer | C5 SW Architect
General Dynamics Mission Systems, Inc
Remote, United States
CLEARANCE REQUIREMENTS:[Department of Defense Secret security clearance is preferred at time of hire.] Applicants selected will be subject to a U.S. Government security investigation and…
Added 2 days ago
Senior .Net developer (Secret Clearance)
System One
Stafford, VA
Design and Develop .NET based web application functionality using C# and MVC
Added 2 days ago
S
Senior Application Developer
SOSi
Fort Belvoir, VA
- $140,000 to $155,000 USD / year
SOSi is seeking a highly qualified Senior Application Developer to join our team 100% on site in Fort Belvoir, VA, in support of our government customer. In this role, the Senior…
Added 2 days ago
AE
CNO Analyst Programmer 1 (AE26100943A)
Advantage Engineering & IT Solutions Inc
Hanover, MD
- $140,918 to $151,758 USD / year
Clearance: Active Top Secret SCI with polygraph.
Added 2 days ago
AE
CNO Analyst Programmer, Level 2 (AE26100935A)
Advantage Engineering & IT Solutions Inc
Hanover, MD
- $169,703 to $182,757 USD / year
Clearance: Active Top Secret SCI with polygraph.
Added 2 days ago
AE
CNO Analyst Programmer, Junior (AE26100928SW0A)
Advantage Engineering & IT Solutions Inc
Hanover, MD
- $114,079 to $122,854 USD / year
Clearance: Active Top Secret SCI with polygraph.
Added 2 days ago
SI
Senior Application Developer
SOS International LLC
Fort Belvoir, VA
- $140,000 to $155,000 USD / year
SOSi is seeking a highly qualified Senior Application Developer to join our team on site in Fort Belvoir, VA , in support of our government customer. In this role, the Senior Application…

SOS International LLC

Senior Application Developer

Fort Belvoir, VA, United States

$140,000 to $155,000 USD / year

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Job details

Pay: $140,000 to $155,000 USD / year
Posting language: English
Posted: Oct 27, 2026

Original job description

Fort Belvoir, VA, USA

Full-time

Clearance Requirement: Top Secret

Compensation: USD 140000 - USD 155000 - yearly

Company Description

Founded in 1989, SOSi is among the largest private, founder-owned technology and services integrators in the defense and government services industry. We deliver tailored solutions, tested leadership, and trusted results to enable national security missions worldwide.

Job Description

Overview:

SOSi is seeking a highly qualified Senior Application Developer to join our team on site in Fort Belvoir, VA , in support of our government customer. In this role, the Senior Application Developer will serve as a technical expert responsible for the design, development, integration, and maintenance of complex software applications. The position requires a strong proficiency in .NET Core and extensive experience supporting the operation, enhancement, and modernization of the ITCD (Information Technology and Compliance Directorate) family of applications. The ideal candidate excels in system integration, collaborates effectively across teams, delivers high‑quality solutions, and provides mentorship to junior developers. This role is best suited for someone who is proactive, detail‑oriented, and committed to building reliable and scalable systems.

Essential Job Duties:

Design, develop, test, and maintain high‑performance software applications.
Analyze business requirements and translate them into technical specifications.
Lead the architecture and design of application components and integrations.
Review code for accuracy, quality, and adherence to best practices.
Troubleshoot and resolve complex technical issues across the application stack.
Collaborate with cross‑functional teams, including product managers, QA, and DevOps.
Contribute to process improvements, automation, and development standards.
Mentor junior developers and support team knowledge sharing.
Stay current with emerging technologies and recommend solutions when appropriate.
Support the project manager in overseeing project operation, planning, and execution.
Formulate objectives and levels of effort through research and fact-finding with customer representatives and project managers.
Be responsible for the software development life cycle from planning to implementation to testing and documenting, to deployment and maintenance.
Assist the project manager and client in developing a schedule/timeframe for each project to ensure each one is executed efficiently and in a timely manner.
Create and maintain complete and accurate documentation on all supported applications.
Oversee technical issues related to the operation, maintenance, and modification of GOTS application.
Work with customer stakeholders to design or customize software with a focus on optimizing operational efficiency.
Apply knowledge of hardware and/or software engineering principles.
Design and/or customize software for client use to optimize operational efficiencies.
Monitor application performance and perform application changes to optimize performance.
Analyze and design GOTS applications and systems with a focus on improving functionality and stakeholder usability.
Provide evaluations and recommendations of GOTS applications and systems to provide solutions to complex technical challenges.
Follow all applicable agency policies, procedures, and regulations.
Provide technical guidance to lower-level developers and engineers.

Qualifications

Bachelor’s degree or postgraduate degree in engineering, scientific, technical, or business management disciplines from an accredited college or university.
A minimum of 5 years of technical supervisory experience in an application/software development environment.
An active in scope Top Secret security clearance, or Secret with the ability to obtain a Top Secret.
Experience with GOTS applications such as ARMIS, AAO, ACOTD, FACTS, MDR, or ADAMS.
Experience with Microsoft SQL and the .NET framework.
Experience with Configuration Management processes including Change Control Boards (CCB).
Ability to schedule, track, and perform across multiple concurrent projects.
Must have demonstrated the ability to communicate with a variety of stakeholders in multiple formats.
Must possess baseline and computing environment certifications for IAT-II IAW DoD 8570.01-M (CCNA-Security, CySA+, GICSP, GSEC, Security+, CND, or SSCP).
5–8+ years of professional experience in software or application development.
Strong proficiency in modern programming languages and frameworks (such as C#, JavaScript, .NET, or similar).
Hands-on experience with cloud platforms and services (AWS, Azure, or GCP).
Proficiency with REST APIs, microservices, and application integration patterns.
Solid understanding of relational and NoSQL databases.
Experience with CI/CD pipelines, version control systems, and automated testing.
Strong analytical, problem‑solving, and communication skills.
Ability to work independently while supporting team goals.

Additional Information

Work Environment:

Normal office conditions.
Core hours of operation are Monday through Friday, 0600 – 1700.
On government site within Fort Belvoir, VA.
No hybrid or remote availability.
Compensation: $140K - $155K yearly.

Working at SOSi:

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

SOSi is an equal employment opportunity employer and affirmative action employer. All interested individuals will receive consideration and will not be discriminated against on the basis of race, color, religion, sex, national origin, disability, age, sexual orientation, gender identity, genetic information, or protected veteran status. SOSi takes affirmative action in support of its policy to advance diversity and inclusion of individuals who are minorities, women, protected veterans, and individuals with disabilities.

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