Jobs at Celestar Holdings Corporation

Leads cybersecurity compliance and authorization activities for mission-critical government systems. Conducts security assessments, implements RMF and NIST 800-53 controls, manages IATT and ATO processes, maintains SSPs, SAPs, POA&Ms, and coordinates remediation with engineering, operations, assessors, system owners, and government stakeholders. Supports Zero Trust architectures, Splunk-based monitoring, continuous compliance, and classified enterprise programs.

Leads comprehensive testing for mission-critical Java web applications, including functional, regression, integration, UI, accessibility, security, and performance validation. Troubleshoots backend issues using logs, APIs, and SQL; validates enterprise integrations, installations, and configurations; develops automated UI testing frameworks and integrates them into GitLab CI/CD. Manages defects, produces quality reports, and collaborates with technical, business, systems, and security teams in regulated government environments.

Lead data science for defense clients: perform data engineering, mining, exploratory/predictive/statistical analysis; build ML/AI tools (recommendation engines, automated scoring); manage large, disparate data sources using R/Python/SQL; create visualizations in Power BI/Tableau; support Multi-INT analytics and provide senior-level analytic products for the defense cover program.