Software developer jobs in Mount Pleasant, DC and nearby (659 jobs)

Software developer jobs within 25 miles of Mount Pleasant, DC. Nearby towns and cities are included. Distances are straight-line, not driving distances.

Counted Nov 10, 2026

Hiring at a glance

View jobs

Open jobs: 659
Employers: 237

Advertised starting pay

Average starting payUSD / year: $127,185Across 85 listings

Employer-advertised starting pay, not employee salaries. Currencies and pay periods stay separate.

Where work happens

Remote: 0%0 listings
Hybrid: 1%7 listings
On-site: 18%119 listings

Not specified: 81% (533 listings)

Employers hiring include Leidos (27), CACI International (25), Booz Allen Hamilton_United States (21).

Sources & calculation notes

These figures describe the listings on this role page at the date shown, not the whole job market. Listings can change.

Employer-listed minimums from at least 10 listings per currency and pay period. These are advertised starting amounts, not employee salaries. Jobs without a minimum and unusual amounts are excluded.

Hybrid and on-site classifications may be inferred from descriptions. Check the original ad. How we count

Software developer jobs in Mount Pleasant, DC and nearby

Within 25 miles

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Added 13 hours ago
Sr Software Developer
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Added 13 hours ago
Sr Software Developer
Cherokee Federal
Chantilly, VA
Added 13 hours ago
Sr Software Developer
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Chantilly, VA
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Chantilly, VA
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McLean, VA · Rosslyn, VA
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Suitland, MD
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Software Developer – Entry Level (Top Secret Clearance Required)
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Suitland, MD
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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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