ACTIVE TS/SCI WITH FULL SCOPE POLY REQUIRED Our client supports and secures some of the most complex government, defense, and intelligence projects across the country. We ensure today is safe and tomorrow is smarter. Our work has meaning and impact on the world around us, but also on us, and that's important.Our client creates a family environment. You make it your own by embracing autonomy, seizing opportunity, and being trusted to deliver your best every day. And their work depends on an Applications Developer joining our team to support Government activities at Herndon, VA.As an Applications Developer supporting the customer, you will be trusted to support the development of web app APIs for current tools. In this role, a typical day will include: Working with customers in solving complex analytical problems. Opportunity to design and develop applications and lead small projects. Opportunity to develop applications with varying degrees of scale, risk and complexity. May include serving as the technical lead for the design, testing, and implementation of complex applications, complex web application layouts, content and user interfaces and/or database projects. RequirementsREQUIRED QUALIFICATIONS: Education: Bachelor's degree in Computer Science, Engineering, or a related technical discipline, or the equivalent combination of education, technical certifications or training, or work experience. Minimum of 11 years related experience. Technical Skills: Demonstrated on-the job experience with full life-cycle application software development with specialized experience to include hands on involvement in all aspects of the applications software development life-cycle (requirements analysis, design, programming, testing, and deployment as well as troubleshooting). Demonstrated on-the job experience building APIs or micro-services as well as writing tests. Demonstrated on-the-job experience with JSON as it is the encoding choice for the majority of APIs published. Experience with authentication protocols (ie mutual auth, basic auth, oAuth) Knowledge of common web service protocols (such as HTTP, REST), including understanding the architectural style and all its permutations. Application development using scripting language such as Python, NodeJS, etc. Experience with Agile production development methodologies, working on a Scrum Team. Strong experience in building, configuration and administration of APIs. Experience with diagnosing and debugging complex systems. Experience with Windows and Linux operating systems and Command Line Tools (Power Shell, Cron) Preferred Qualifications: Demonstrated on-the job experience with the Sponsor's development platform (RAILS is the preferred technology)