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Added 13 days ago
IC
Principal User Experience Researcher -Acton, MA or San Diego, CA (Hybrid)
Insulet Corporation
Acton, MA · San Diego, CA
- $171,800 to $257,750 USD / year
Mentor junior staff on interaction design principles and processes.
Added 13 days ago
SS
ServiceNow Senior Developer / Technical Lead
Softthink Solutions Inc
Tysons Corner, VA
- $50 to $55 USD / hour
Must have minimum Public trust clearance
Added 13 days ago
ID
Senior SharePoint Developer
ITC Defense
Lexington Park, MD
- $95,000 to $145,000 USD / year
Overview: ITC Defense is seeking a Senior SharePoint Developer to support the design, modernization, and sustainment of Microsoft SharePoint Online and Microsoft 365 solutions in support of…
Added 13 days ago
Automation Test Lead Engineer- Facets Claims, Enrollment and Billing (Remote)
CareFirst
Baltimore, MD
…requirements and creates highly complex systems. Acts as a mentor to junior…
Added 13 days ago
A
Senior Email Production Specialist
Amsive
New York, NY
- From $70,000 USD / year
This is a HYBRID position (1-2 days in office) located in Midtown Manhattan, New York, NY
Added 13 days ago
Sr. Software Engineer
Zeitview
Mountain View, CA
Mentor junior engineers and contribute to a culture of learning and experimentation.
Added 13 days ago
Jr. Full Stack Developer
The Cadmus Group, Inc.
UNAVAILABLE
Cadmus is seeking a Junior Full Stack Developer to join our Federal Operations Group. This role provides full-stack software development support to a file management application team, a…
Added 13 days ago
Software Engineer - Integration Center
SHI International Corp
Piscataway, NJ
…integration and QC teams, and OEM technologies, while also mentoring junior…
Added 13 days ago
Junior Software Engineer
Priceline.com LLC
NY
Junior Software Engineer/Developer - Front End
Added 13 days ago
Senior Full-Stack Software Engineer
Cisco
San Jose, CA
Collaborate with team members on the design and implementation of frameworks and backend components and mentor junior engineers, to help develop their technical skills, communication and…
Added 13 days ago
IA
Sr. Full Stack Developer (51611)
INDEX ANALYTICS LLC
Baltimore, MD
- $145,000 to $185,000 USD / year
Index Analytics is seeking a Senior Full Stack Developer responsible for designing, developing, and maintaining web applications across both front-end and back-end stacks. This role…
Added 13 days ago
CO
Senior Application Developer
Commission on Teacher Credentialing
CA
- $8,625 to $11,557 USD / month
.NET 6+ (.NET Core), ASP.NET Core, C#, MVC, SQL, HTML/CSS, JavaScript/jQuery, Language Integrated Query (LINQ), and Entity Framework.
Added 13 days ago
AI
Senior Software Developer
Alphonso Inc
Denver, CO
- $205,000 to $215,000 USD / year
Added 13 days ago
Software Engineer
CACI
Aurora, CO · Ypsilanti, MI · King of Prussia, PA · Aurora · Ypsilanti · King of Prussia
If you're passionate about technology, ready to grow beyond junior-level work, and excited to make an impact on space mission systems, we would love to hear from you!
Added 13 days ago
Software Engineer
CACI
Aurora, CO · Ypsilanti, MI · King of Prussia, PA · Aurora · Ypsilanti · King of Prussia
If you're passionate about technology, ready to grow beyond junior-level work, and excited to make an impact on space mission systems, we would love to hear from you!
Added 13 days ago
AI & Software Engineering Lead
PMG
Dallas, TX
Fostering a culture of collaboration and innovation by mentoring junior and mid-level engineers and promoting development best practices.
Added 13 days ago
Staff Software Engineer, Supply Chain Warehouse Execution Systems (Remote)
HOME DEPOT MANAGEMENT COMPANY, LLC
Remote, United States
…You’ll serve as a core member of a balanced team, mentoring junior engineers, and helping them expand both their technical expertise and leadership…
Added 13 days ago
S
SharePoint/Power Apps Developer
SOSi
Fort Belvoir, VA
- $90,000 to $110,000 USD / year
SOSi is seeking a highly qualified SharePoint/Power Apps Developer to join our team 100% on site in Fort Belvoir, VA, in support of our government customers. In this role, the…
Added 13 days ago
EU
Software Engineer III $90,000- $120,000 Missoula/Hybrid/Remote
ELM Utility Services
Missoula, MT
- $90,000 to $120,000 USD / year
…independently carry work through the full SDLC, and mentor junior engineers while contributing to system design and architecture decisions. This role works closely with Product, QA, and…
Added 13 days ago
Senior Manager, Software Engineering
Walmart
BENTONVILLE, AR
…high-scalability needs. Assist in selecting appropriate languages (e.g., JavaScript, Python, C#), development standards, and tools (e.g., Monday.com, Linx, Embold) for software coding and…
Added 13 days ago
Full Stack Developer (Drupal)
Steampunk
McLean, VA
As a Full Stack Developer, you will work with our growing DevSecOps practice delivering software features, APIs, and micro-service solutions. We are looking for candidates with at least 5…
Added 13 days ago
SCADA Lead Full Stack Application Developer - Industrial Automation
The Sherwin-Williams Company
Cleveland, OH
The Lead Full Stack Application Developer role will be responsible for leading the broaderprocess of developing and deploying enhancements and/or new applications used in local, networked,…
Added 13 days ago
ServiceNow Developer
CNMK Texas Properties, LLC.
Plano, TX
…technology supporting the theater environment. The ServiceNow Developer assists with implementing new modules and integrations within the ServiceNow Platform, customizing module functions…
Added 13 days ago
DP
Sr. FullStack Java Developer
District Partners
Ashburn, VA
- $50 to $60 USD / hour
Work Model: Onsite five days per week for the first 6–12 months, followed by a hybrid schedule
Added 13 days ago
S
Senior Application Developer
SOSi
Fort Belvoir, VA
- $140,000 to $155,000 USD / year
Must have demonstrated the ability to communicate with a variety of stakeholders in multiple formats

SOSi

Senior Application Developer

Fort Belvoir, VA, United States

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

Apply on jobs.smartrecruiters.com About employer

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Job details

Pay: $140,000 to $155,000 USD / year
Posting language: English
Posted: Oct 28, 2026

Original job description

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 100% 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:

100% on government site within Fort Belvoir, VA.
Normal office conditions.
Core hours of operation are Monday through Friday, 0600 – 1700.
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.

Apply on jobs.smartrecruiters.com About employer

More about this job

Skills

.NET
ICT system integration
Troubleshoot
DevOps
Research
Software development
Documentation
Engineering principles
SQL
Microsoft .NET Framework
CCNA
Security+
Programming languages
C#
JavaScript
AWS
Microsoft Azure
Google Cloud
API development
Microservices
NoSQL
CI/CD
Control systems
Test automation
Problem solving
Communication skills
Work independently

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Work requirements

Jobs in the United States