Software Developer I (Junior)
3Si Security Systems
Ashburn, VA
Apply
JOB DETAILS
SKILLS
Application Programming Interface (API), Atlassian JIRA, Best Practices, C Programming Libraries, Communication Skills, Computer Science, Cross-Functional, Debugging Skills, Develop and Maintain Customers, Documentation, Financial Regulations, GPS (Global Positioning System), Git, HTTP (HyperText Transport Protocol), HTTPS (HyperText Transport Protocol Secure), Information Technology Software, Law Enforcement, Leading Edge Technology, Microsoft .NET, Microsoft C# (C Sharp), Microsoft Visual Studio, Programming Tools, REST (Representational State Transfer), Retail, Sales Support, Scalable System Development, Secure Coding, Software Design, Software Development, Software Development Lifecycle (SDLC), Software Engineering, Surveillance, Team Player, Technical Support, Telerik, Test Plan/Schedule, User Documentation, User Interface Tools, Windows Presentation Foundation (WPF)
LOCATION
Ashburn, VA
POSTED
1 day ago
At 3Si, our mission is to make your world, safer. As a global leader in innovative security technology, we help businesses and law enforcement prevent and respond to crime through field-proven solutions and trusted partnerships. With over 100+ years of combined experience through our merged companies, our expertise drives measurable impact in communities worldwide.
We specialize in GPS tracking, video surveillance, and integrated response technologies that deter theft and accelerate criminal apprehension. Designed for retail, financial institutions, law enforcement, and more, our solutions combine cutting-edge tools with unmatched response capabilities. Through our exclusive DirectToDispatch technology, verified crime alerts are sent directly to law enforcement dispatch centers in real time—bypassing traditional third-party monitoring delays—to enable rapid, precise response when it matters most.
At 3Si, meaningful work makes a difference. We’re a purpose-driven team that values innovation, trust, and collaboration. From engineering to sales and support, every role contributes to our mission to protect communities and make the world safer. We offer a hybrid, flexible work culture, competitive benefits, and the chance to grow alongside a team of passionate, dedicated professionals.
Join us—and be part of something that matters. The Junior Software Developer is responsible for participating in technical development, testing, debugging, and implementation of enhancements to enterprise-level applications. The developer is expected to work collaboratively with senior developers and members of the team, contributing to the mission-critical success of our organization. Additionally, you may be tasked with writing Jira tickets, technical user guides, and supporting documentation.
Primary Responsibilities
Participate in full software development lifecycle activities, including design, development, testing, debugging, and implementation
Design and develop scalable software solutions using C# and .NET
Collaborate with other developers and cross-functional teams to ensure technical alignment with project goals
Utilize development tools such as Visual Studio, Git, Jira, and
Work with technologies including REST/ServiceStack, WPF, Progress/Telerik UI Toolkit
Support and maintain client and server utilizing REST and HTTPS protocols
Perform other duties as needed to support the company’s mission and project requirements
Knowledge, Skills, and Abilities
Understanding of full-stack development practices
Proficiency in C# and the .NET framework
Experience with Windows Presentation Foundation (WPF)
Knowledge of software development best practices and secure coding techniques
Ability to work with RESTful APIs and HTTP network technologies
Skilled in using Visual Studio, Git, and Jira
Strong problem-solving and analytical abilities
Effective communication and collaboration skills
Ability to work independently or within a team environment
Qualifications
Bachelor’s degree in Computer Science, Information Technology, Software Engineering, or a related technical field
Equivalent professional experience may be considered in lieu of formal education
Associate degree in a technical discipline combined with relevant experience and/or industry certifications may also be considered
1 year of related software development experience
1 year of hands-on experience in C#/.NET development
Experience with reusable C# library development and version-controlled environments
Additional Comments
Position on-site in Ashburn, VA.
Successful candidates must pass a comprehensive background investigation
Pre-employment drug screening is required
- Comprehensive benefits package including medical, dental, vision, life insurance, short- and long-term disability starting on your first day
- 401(k) retirement savings plan with company match
About the Company
3
3Si Security Systems
Established as a repair center for manufacture warranty and other repairs in 1955.
Increased our service to include among audio, TV, PLASMA, LCD, LED service and now Home Appliances.
For the last 10-15 years we have added Security Alarms Service/Installation. This branch has increased in work
so much that we had to recruit more alarm techs and vans.
COMPANY SIZE
10 to 19 employeesINDUSTRY
Security and Surveillance
FOUNDED
1955
WEBSITE
http://avrsecurity.com