Full Stack Developer

Who We Are Sellers & Associates, LLC (S&A) is a Veteran Owned Small Business (VOSB) that provides effective and affordable Programmatic and Engineering Support Services and Solutions to our Government and Commercial Clients. We work directly with our clients taking the time to understand their culture and requirements designing a custom solution tailored to meet their unique needs at an affordable price without sacrificing quality. Our specialties include Program/Engineering Management, Training/Training Technology, Technology/Product Development Strategy and Analysis, Project Management (Cost, Schedule, Scope & Quality), and Strategic Planning applied within our clients' unique domains and context. Benefits We have Medical, Dental, Vision, 401k with company match. Long/Short Term Disability and Life Insurance. 25 days of PTO per year. Employees may choose to work or take PTO on Federal Holidays (pending contract requirements). We also offer a TRICARE Supplement Insurance Package as well as Tuition Reimbursement up to $5,250 per year for areas of study relevant to employee position responsibilities and opportunities for professional growth. Position Description Job Title / Labor Category Title Full Stack Developer Location Arlington, VA US (Primary) Security Clearance Requirements Secret Job Description We are seeking a versatile and detail-oriented Full Stack Software Developer to join our team in building secure, scalable applications for federal and DoD customers. This will be a full-time role supporting GoblynWerx, the Technology Development unit of Sellers & Associates, LLC. The position requires a hands-on developer with strong quality assurance instincts and the ability to work across the full technology stack, including front-end, back-end, databases, and cloud infrastructure. The ideal candidate will have experience developing secure applications in compliance-focused environments, a passion for writing clean and testable code, and a proactive approach to quality throughout the software development lifecycle. In addition to strong coding skills, this role also requires experience designing and integrating Commercial Off-The-Shelf (COTS) low-code platforms such as Power BI, Power Apps, Dataverse , and other tools within the Microsoft Power Platform to deliver efficient and user-friendly solutions. Familiarity with federal Risk Management Framework (RMF) processes or experience working within DoD environments is highly preferred. Responsibilities: Design, develop, and deploy secure and scalable applications using modern full-stack technologies. Extend low-code apps with custom code when needed (front-end, back-end, APIs) to meet mission-specific requirements. Integrate low-code systems into secure government environments (enterprise systems, on-prem databases, and cloud services). Work with customers to gather and analyze requirements, design wireframes, build prototypes, and implement solutions. Deliver features across front-end interfaces, server-side logic, APIs, databases, and cloud infrastructure. Write clear, maintainable, and well-documented code with a focus on testability and code quality . Build and execute test plans, unit tests, and integration tests to ensure functional reliability and system integrity. Conduct QA tasks such as test case development, regression testing, and bug resolution prior to deployment. Integrate and manage databases (e.g., SQL Server, MySQL, MongoDB, Redis, Dataverse) and ensure data integrity. Consume and develop RESTful APIs and integrate with cloud platforms such as AWS . Use Git version control to manage code collaboration and maintain clean project histories. Collaborate with cross-functional teams to support secure, functional, and intuitive applications. Job Requirements Required Qualifications: Active Secret clearance required Bachelor's degree in Computer Science, Information Technology, Engineering, or a related field is preferred. A minimum of 10 years of total, relevant professional experience may be substituted in lieu of a degree. 6-8 years of hands-on full-stack development experience. Required Knowledge, Skills, & Abilities: Strong understanding of software testing principles, debugging techniques, and QA best practices. Attention to detail, excellent problem-solving skills, and commitment to delivering high-quality solutions. Understanding of Jira / Agile methodology. Proficiency with at least one modern scripting/programming language such as Python, JavaScript/TypeScript, C#, or • PowerShell to extend and integrate low-code applications. Required Experience: Experience with COTS data analytics applications, including Microsoft Power Platform tools such as Power BI, Power Apps, PowerAutomate, and SharePoint. Front-End: HTML, CSS, JavaScript, and a modern framework such as React or Angular. Back-End: Python and Node.js (highly preferred). Databases: Experience with at least one of the following: SQL Server, MySQL, MongoDB, Redis, and/or Dataverse. Git for source control and team-based development workflows. Preferred Experience: Experience with at least one RDBMS, including SQL query writing, such as SQL Server, MySQL, or PostgreSQL. Practical experience developing and hosting applications or data solutions in Azure or AWS. Familiarity with Git for source control and team-based development workflows. Familiarity with QA automation frameworks (e.g., Jest, PyTest, Cypress, Selenium). Knowledge of containerized development and deployment (e.g., Docker). Experience with DevOps tools and CI/CD pipelines. Previous experience working on government contracts or secure software environments. Familiarity with Naval Sea Systems Command (NAVSEA), and/or U.S. Navy Agile certifications such as Certified ScrumMaster (CSM), Professional Scrum Master (PSM I/II), SAFe Scrum Master (SSM), or PMI Agile Certified Practitioner (PMI-ACP). Familiarity with Risk Management Framework (RMF) and/or Authority to Operate (ATO) processes and procedures. Experience working within DoD IT environments, including IL4, IL5, or IL6 systems, and compliance with DoD STIGs and security controls. Required Knowledge, Skills, & Abilities (KSAs) See required knowledge, skills, & abilities as well as experience in the Job Requirements. Travel % 0 - 10% Sellers and Associates, LLC is an E-Verify company and an Equal Opportunity/Affirmative Action Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status and will not be discriminated against on the basis of disability. Sellers & Associates, LLC