Full Stack Developer; PostgreSQL, Python, Java, .NET

ABOUT THE ROLE

Must be a U.S. Citizen with Active TS and eligible for a Top Secret (Tier
5) clearance. No third party. No H1B or Green Card holders.

Strategic Innovation Group (SIG) is seeking a Full Stack Developer to support the design, development, testing, deployment, and maintenance of a secure, scalable data-visualization and AI-enabled analytics application for a federal government client. The application delivers browser-based dashboards, filtering and drill-down, analytic signals, and natural-language search over a centralized PostgreSQL data core, and is built on-premises within the client's FedRAMP Moderate environment.

The ideal candidate will work across the full software development lifecycle in an Agile environment, collaborating with the program manager, solutions architect, data engineers, AI/ML engineer, configuration manager, security lead, accessibility partner, and client stakeholders to deliver reliable, mission-focused technology.

SIG is a fast growing 8(a) government contractor based in Arlington, Virginia. We offer a broad range of technical expertise and experience in Digital Transformation, Data Management/Data Science, and Systems Modernization. At SIG, our people are our mission. Come join our team! A successful candidate will be offered the following:

• - Great work/life balance
• - Eligibility for performance-based participation in cash bonuses
• - Potential to participate in growth of the company through incentives
• - Excellent benefits, including health, dental, vision, generous PTO, a 401(k) with match, life insurance, short- and long-term disability, and a health savings account (HSA)

• - Design, develop, test, deploy, and maintain the browser-based examiner application, including portfolio and program dashboards, filtering and drill-down by type, geography, recipient, agency/program, and status, a consolidated awards-and-signals view, and routine and customizable reports, using React (or Angular) on the front end and Python (FastAPI/Django), Java (Spring Boot), or .NET (ASP.NET Core) on the back end, as directed by the solutions architect.
• - Develop RESTful APIs and services over the PostgreSQL data core using JSON, including inspectable, executable dashboard and signal queries that run deterministically without a live AI model.
• - Build interactive data visualizations with D3, Plotly, Recharts, or a comparable charting library.
• - Integrate the natural-language search and summarization services delivered by the AI/ML engineer (on-premises LLM, retrieval-augmented generation, pgvector or comparable vector store), preserving traceability from every AI output to its source record or document.
• - Implement authentication and role-based access control against the client's enterprise identity services (SAML, OAuth 2.0/OIDC, CAS), session management, and audit logging that forwards to Splunk.
• - Containerize the application with Docker and deploy through the program CI/CD pipeline (Git Lab, Jenkins or Azure Dev Ops) to the client's Rancher-managed Kubernetes platform, working with the configuration manager on builds, security scanning, and releases.
• - Implement automated unit, integration, and API testing (pytest, JUnit, xUnit, Playwright or Cypress) and secure coding standards aligned to NIST SP 800-53 Moderate controls.
• - Build exclusively with the program's Section 508-audited component library; perform keyboard/tab-order testing and automated accessibility scans (axe or equivalent) before code review, and remediate accessibility findings within the sprint.
• - Troubleshoot and resolve software defects, integration issues, query performance bottlenecks, and production errors.
• - Create and maintain technical documentation, system designs, release notes,…