Senior Security Engineer - Data Protection & Insider Threat - Northern VA

POSITION SUMMARY

Constellis is seeking a skilled Sr. Security Engineer to lead initiatives in data protection, classification, and insider threat detection. This role will focus on securing enterprise data through advanced controls, supporting eDiscovery and DLP operations, and investigating potential misuse or leakage of sensitive information.

• Design and implement data classification frameworks aligned with regulatory and contractual requirements (e.g., CMMC, CUI, DFAR, GDPR, ITAR).
• Manage and optimize Data Loss Prevention (DLP) policies across endpoints, on-premises, cloud services, and email platforms.
• Support eDiscovery workflows, including review set management, legal hold coordination, and audit trail integrity.
• Conduct insider threat investigations using behavioral analytics, audit logs, and forensic tools.
• Collaborate with Legal, HR, and Compliance teams to ensure ethical and lawful handling of sensitive data.
• Maintain and enhance data protection and data governance platforms.
• Develop and document security controls, workflows, and incident response playbooks related to data misuse.
• Monitor regulatory developments and update controls to maintain compliance.
• Actively search all areas of the internal network for hidden threats and vulnerabilities.
• Support audits and compliance efforts.
• Participate in red/blue/purple team exercises as needed to analyze threat scenarios and assess internal defenses and document results.
• Engage positively across multiple teams to establish clarity, vision, and mutual trust in order to achieve business goals.
• Adhere to industry‑specific local, state, and federal regulations, as applicable.
• Other duties as assigned.

• Bachelor's degree preferred. Five additional years of related experience beyond the minimum may be substituted in lieu of a degree.
• 5+ years of experience in data security, DLP, or insider threat investigations.
• Hands‑on experience with tools like Microsoft Purview, eDiscovery, and classification tools.
• Experience with SIEM, UEBA, and forensic investigation tools.
• Excellent analytical, communication, and documentation skills.
• Ability to obtain and maintain at least a Top Secret clearance.

Constellis offers a comprehensive, total rewards package that includes competitive compensation and a flexible benefits package that reflects its commitment to creating a diverse and supportive workplace.

• Medical, Vision & Dental Insurance
• Paid Time‑Off Program & Company Paid Holidays
• 401(k) Retirement Plan
• Insurance:
  Basic Life & Supplemental Life
• Health & Dependent Care Flexible Spending Accounts
• Short‑Term & Long‑Term Disability
• Personal Development & Learning Opportunities
• On‑the‑job Training, Skills Development & Certifications
• Corporate Sponsored Events & Community Outreach

Work is typically based in a busy office environment and subject to frequent interruptions. Business work hours are Monday‑Friday standard core hours, however some extended or weekend hours may be required.

In an ever‑changing and complex world, security concerns are paramount. Enhanced security requires education, training, and specialized skills. Constellis provides end‑to‑end risk management and comprehensive security solutions to safeguard people and infrastructure globally. Our team of strategic problem solvers has a steadfast moral compass and unwavering dedication to creating a safer world. Constellis is committed to the success of our customers and partners.

Constellis protects critical priorities safely and efficiently around the world. Operating globally and based in the Washington D.C. area, our employees bring unparalleled dedication and passion for creating a safer world and upholding the highest standards of compliance, quality, and integrity. As a leading global provider of risk management, security, humanitarian, training and operational support services to government and commercial customers worldwide, Constellis’ forward‑thinking solutions include a range of synergistic services, including background investigations, social intelligence tools, advanced training, logistics and life support, UAV and K9 services, and crisis response mitigation.

At Constellis, our number one priority is to secure success for our customers. For more information, visit

Constellis and its affiliated companies are equal opportunity employers. All applicants receive consideration without regard to race, color, sex, age, ethnicity, religion, national origin, disability, veteran status or any other characteristic prohibited by federal, state, or local law.