AI Prompt Engineer

Everforth ECS is seeking an AI Prompt Engineer to work in Arlington, VA.

ECS is seeking talented professionals to join our growing team supporting the Cybersecurity and Infrastructure Security Agency's (CISA) Technical Engineering and Support Services (TESS) program. TESS is CISA's integrated, capability-driven mission ecosystem designed to scale across mission and delivery spaces within the DHS/CISA/Cybersecurity Division.

Job Description

The Prompt Engineer (Vulnerability & Risk Analytics) designs and governs AI-assisted workflows that accelerate the analysis of software vulnerability and risk data for the TESS program. Operating on-site in Arlington, VA, the engineer will utilize CISA-approved enterprise AI tools (primarily Microsoft Copilot) to transform complex security datasets into actionable intelligence. The position requires disciplined testing, structured framework design, and detailed documentation to ensure all AI outputs are reliable, secure, and reproducible in a federal cybersecurity environment.

Key Responsibilities

• Structured Prompt Design: Craft, deploy, and refine structured system and user prompts utilizing advanced role-play and constraint strategies to support software vulnerability analysis, CVE/CWE parsing, and threat risk summaries.
• Model Optimization & Parametric Testing: Systematically test model outputs across varied enterprise temperature and grounding parameters to eliminate hallucinations in risk scoring and threat summarization.
• Governance & Prompt Library Management: Document prompt patterns, maintain a centralized, version-controlled repository of reusable prompts, and establish clear guidelines for when to apply specific techniques.
• Quality Gates & Reproducibility: Enforce rigorous validation and reproducibility rubrics to benchmark prompt accuracy, consistency, and repeatability across software supply chain and vulnerability data feeds.
• Operational Alignment: Translate manual CISA cybersecurity workflows into standardized AI-assisted templates to assist technical delivery teams and capability leadership.
• Active Top Secret (TS) clearance with the ability to obtain DHS/CISA Suitability.
• 3+ years of professional experience working with AI/ML tools or large language models, with a strong preference for candidates supporting federal, defense, or intelligence organizations.
• Experience with Primary Tooling: CISA-approved AI toolsets (Enterprise Microsoft Copilot / M365 Copilot / GovCloud AI Environment)
• CompTIA Security+ or an equivalent CompTIA certification meeting DoD 8140/8570 IAT Level II requirements.
• Demonstrated expertise in generative AI prompt engineering techniques (such as chain-of-thought, few-shot framing, and system instructions) and prompt evaluation/testing methodologies.
• Proven capability to document, standardize, and scale repeatable technical practices for broader team adoption.

Desired Skills

• Bachelor’s degree in Computer Science, Data Science, Information Technology, or a related analytical field.
• Familiarity with federal cybersecurity frameworks , including NIST SP 800-53, CVE/CWE schemas, and the CISA Known Exploited Vulnerabilities (KEV) catalog.

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ECS Federal LLC is an equal opportunity employer and does not discriminate or allow discrimination on the basis any characteristic protected by law. All qualified applicants will receive consideration for employment without regard to disability, status as a protected veteran or any other status protected by applicable federal, state, or local jurisdiction law.

Everforth ECS is the federal segment of Everforth , a $4B global organization with over 10,000 employees. Our nearly 3,500 professionals deliver advanced technology solutions in data and AI, cybersecurity, and enterprise transformation, serving defense, intelligence, and federal civilian agencies.
Our work powers mission-critical outcomes, strengthens technology partnerships, and creates meaningful opportunities for our people. We are defined by a commitment to excellence in delivery, a culture of innovation, and an environment where talent can thrive and grow.
We value:

• Attracting and developing top talent and high-performing teams
• Fostering a culture that is engaging, accountable, and mission-driven

Meet the challenge. Make a difference with Everforth ECS!

ECS Federal LLC is an equal opportunity employer and does not discriminate or allow discrimination on the basis any characteristic protected by law. All qualified applicants will receive consideration for employment without regard to disability, status as a protected veteran or any other status protected by applicable federal, state, or local jurisdiction law.

Everforth ECS is the federal segment of Everforth , a $4B global organization with over 10,000 employees. Our nearly 3,500 professionals deliver advanced technology solutions in data and AI, cybersecurity, and enterprise transformation, serving defense, intelligence, and federal civilian agencies.

Our work powers mission-critical outcomes, strengthens technology partnerships, and creates meaningful opportunities for our people. We are defined by a commitment to excellence in delivery, a culture of innovation, and an environment where talent can thrive and grow.

Meet the challenge. Make a difference with Everforth ECS!