Currently, ManTech is seeking a motivated, career and customer-oriented Applications Developer to help support our current USMC contract out of Quantico, VA. We are looking for a new teammate to support our Marine Corps customer in areas related to Knowledge Management. Specifics involve anything and everything related to creating, maintaining, optimizing, troubleshooting, and decommissioning applications that help our customer meet their mission strategy. Customer support ranges from complex mission critical needs to increasing morale and wellbeing **Responsibilities include but are not limited to:** + Develop new user-facing features + Update and maintain existing applications to meet the command’s mission needs + Build reusable code and libraries for future use + Ensure the technical feasibility of UI/UX designs + Optimize applications for maximum speed and scalability + Test, validate, and receive customer acceptance of new or optimized functionality + Collaborate with other team members and stakeholders + Interface with customers/stakeholders to collect and analyze requirements + Translate the possible to stakeholders for requirement refinement + Integrate other’s tools to meet the command’s mission needs + Systems engineering, systems administration, development, security, operations related tasking + Create documentation to include, but not limited to, code comments, user guides, admin manuals, test procedures, test results + Train peers on concepts and methods used **Minimum Qualifications:** + Bachelors Degree and at least 5 years of related experience with software development and systems administration to include the following: ( _Additional 2 years of experience may be substituted in lieu of degree)_ + Familiar with ServiceNow + Experience with scripting techniques and incorporating into frameworks such as, but not limited to, SharePoint and ServiceNow + Understanding of web site development, customization, branding, authentication, and client-side applications + Experience with HTML/CSS/JavaScript and JavaScript Frameworks such as jQuery + Strong understanding of JavaScript, its quirks, and workarounds + Basic understanding of web markup, including HTML5 and CSS3 + Experience working in a lean/agile development environment with remote teams + Exceptional communication, organization, and leadership skills + Excellent troubleshooting, debugging and optimization skills + Interest in learning new tools, methods, and technologies **Preferred Qualifications:** + Proficient understanding of cross-browser compatibility issues and ways to work around such issues + Proficient understanding of code versioning tools + Good understanding of browser rendering behavior and performance + Front End Web or UI Design Experience + Security + CE or equivalent/higher 8570 cert + 40 hours proof of ‘system administrative’ training. + Cloud experience + Experience with ServiceNow development, administration, and branding + Experience with DoD STIGs to include Linux, databases, and websites **Clearance Requirement:** + Must have an Active Top Secret/SCI DoD clearance **Physical Requirement** : + Sedentary work ManTech International Corporation, as well as its subsidiaries proactively fulfills its role as an equal opportunity employer. We do not discriminate against any employee or applicant for employment. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran. If you are a qualified individual with a disability and require a reasonable accommodation to apply for a position with ManTech through its online applicant system, please email us at careers@mantech.com and provide your name and contact information.