This position requires office presence of a minimum of 5 days per week and is only located at customer's site.AT&T Global Public Sector is a trusted provider of secure, IP enabled, cloud-based, network solutions and professional services to the Federal Government. We are dedicated to recruiting, developing and empowering a diverse, high-performing workforce that is passionate about what they do, committed to our shared values and dedicated to our customers’ mission.Our AT&T National Security organization supports our Nation’s Intelligence Community, operating and assuring critical data, voice, video, and collaboration services for the full spectrum of intelligence operations.AT&T has an opening for a Senior Applications Developer to support a professional services program for a US Government customer in the Washington DC metropolitan area. This Senior Applications Developer role will be primarily focused on the design, development, testing and maintenance of specialized applications to meet current and future customer mission requirements. This role requires expertise in full stack application development and integration with multi-vendor applications, virtual environments, as well as the SIP protocol stack. The Senior Application Engineer will work in conjunction with a matrixed team of systems engineers, database administrators, and software developers to design, install, configure, implement, and maintain complex solutions that support the mission objectives of the customer. Seeking a highly motivated individual who demonstrates effective decision making and analytical skills, high attention to detail and a strong communicator. The candidate should be comfortable working independently and with an integrated team to support customer objectives. Position is full-time on customer premise.Job Duties/Responsibilities:Software Development: Code and test new software applications to meet business requirements and user needs. Front-end – Design and develop user interfaces that facilitate user experienceBackend – Develop server-side logic, create and manage databases and integrate APIs with front-endDatabase Management – Design, implement and maintain databases to store and retrieve data efficientlyApplication Maintenance and Performance Optimization: Maintain and update existing applications to fix bugs, improve performance, and ensure compatibility with new technologies. Requirement Analysis and Documentation: Collaborate with stakeholders to gather and analyze requirements/user stories, creating and maintaining comprehensive documentation. Quality Assurance and Technical Support: Conduct code reviews, unit testing, and integration testing, providing technical support and troubleshooting assistance. Collaboration and Project Management: Work closely with cross-functional teams to deliver projects on time, managing development projects and staying updated with industry trends and technologies. Required Clearance:TSSCI with poly (#tssci) (polygraph)Required Qualifications:Bachelor’s degree in system engineering, Computer Science, Applied Science, Electrical Engineering, Math, Information Assurance, Information Security System Engineering, or related discipline from an accredited college or university, a developer nanodegree, or equivalent work experience, is required. Five (5) years of additional SE experience may be substituted for a Bachelor’s degree. The following skills / prerequisites are required: - Minimum of 5 years of working experience designing, developing, implementing and maintaining application systems and solutions of similar scope, type, and complexity to include:Experience operating within Agile framework methodologies and the software development lifecycle – design, implementation and deployment.Proficiency as a full-stack developer with experience in front-end and back-end languages such as Python, Java, Node.js, Javascript, HTML, CSS, SOAP and RESTful APIs, SQL, PHP, JSON, etc.Familiarity with or prior experience with Session Initiation Protocol (SIP) based real-time IP communication applications. Development and maintenance of communications-based solutions such as integration of real-time communication technologies (voice, video, messaging) and/or mobility applications.Experience architecting software solutions involving user interface (UI), data and database management and server-side logic - Experience in building web applications and designing and integrating RESTful APIs to ensure data flow and or communication exchange information between applications and systems- Hands on experience with databases like MySQL, PostgreSQL, MongoDB to include data schema design and data interactions to support applications- Experience working with source code version control systems to track coding revisions and support collaboration such as Git- Familiar with cyber-security best practices that ensure data integrity and security to protect the application from vulnerabilities including authentication and authorization and encryption.- Strong analytical thinker and problem solver who can efficiently troubleshoot problems, inefficiencies, and performance issues. Familiar with tools and methods for analyzing, debugging and troubleshooting application issues when they arise and demonstrate ability to diagnose, resolve and optimize application using rigorous logic.- Strong communication skills to collaborate effectively with cross-functional engineering team within the Sponsor’s organization.- Occasional travel to other Sponsor locations within the Washington Metro Area may be required. - Demonstrated commitment to professional development and continuous learning both on and off the job to keep current with technology as well as enhance and develop skill and expertise.Desired Qualifications:-Industry certifications in various web design and programming languages, such as HTML, CSS, JavaScript, C#, Python and similar certifications. Examples: Oracle Certified Associate/Professional, Java SE Microsoft Full-Stack Developer Professional Certificate PCEP/PCAP/PCPP JSE/JSA/JSPA/JSPB SIP School Certified Associate (SSCA) Oracle Database SQL Certified Associate/EDB PostgreSQL/MongoDB - Experience or working knowledge of system virtualization, VMWare or equivalent- Experience with cloud services and platforms such as AWS, Azure or GCP- Experience with administration of Linux/Unix systems (RedHat, Rocky, Debian, etc.)- Understand HTML, CSS, JavaScript, and other web technologies- Familiarity with SIP protocol and communication application framework such as Asterisk- Firm understanding of network protocols, TCP/IP and VoIP technologies and conceptsOur Senior Applications Development's earn between $98,100 - $228,600. Not to mention all the other amazing rewards that working at AT&T offers. Individual starting salary within this range may depend on geography, experience, expertise, and education/training.Joining our team comes with amazing perks and benefits:Medical/Dental/Vision coverage401(k) planTuition reimbursement programPaid Time Off and Holidays (based on date of hire, at least 23 days of vacation each year and 9 company-designated holidays)Paid Parental LeavePaid Caregiver LeaveAdditional sick leave beyond what state and local law require may be available but is unprotectedAdoption ReimbursementDisability Benefits (short term and long term)Life and Accidental Death InsuranceSupplemental benefit programs: critical illness/accident hospital indemnity/group legalEmployee Assistance Programs (EAP)Extensive employee wellness programsEmployee discounts up to 50% off on eligible AT&T mobility plans and accessories, AT&T internet (and fiber where available) and AT&T wireline phoneWeekly Hours:40Time Type:RegularLocation:Chantilly, VirginiaAT&T and its subsidiaries are committed to equal employment opportunity. All hiring, promotion, and other employment decisions remain merit-based and free from discrimination on the basis of race, color, religion, religious creed, national origin, ancestry, age, sex, sexual orientation, gender, gender identity, gender expression, physical disability, mental disability, pregnancy, medical condition, genetic information, marital status, citizenship status, military status, veteran status, or any other characteristic protected by federal, state, or local laws. In addition, AT&T will provide reasonable accommodations to qualified individuals with disabilities. AT&T is a fair chance employer and does not initiate a background check until an offer is made. Click here to learn more or request an application accommodation here.