Senior Security Researcher

Location: Arlington, VA, US

Employment Type: FULL_TIME

Overview

We’re hiring a senior researcher to join a new security research team focused on rapid triage, reverse engineering, vulnerability discovery, and proof-of-concept exploit development.

 

You’ll independently investigate unfamiliar systems, turn initial findings into reproducible evidence, and produce reports that others can act on. Practical experience using LLMs and associated agent harnesses throughout technical investigations is required.

 

Pay Range $124,000 - $208,000

The pay range for this position is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, geographic location, and any applicable laws.

Responsibilities

In this role, you will:

 

• Triage incoming findings, reproduce reported behavior, and assess impact and exploitability.
• Analyze source code, binaries, protocols, and runtime behavior to identify vulnerabilities and root causes.
• Develop reliable PoCs that demonstrate impact and document the conditions required for exploitation.
• Write clear reports covering evidence, reproduction steps, root cause, impact, limitations, and remediation considerations.
• Use and troubleshoot LLM-assisted workflows for analysis, experimentation, coding, and report preparation.
• Independently verify model-generated conclusions and code.
• Build reusable research tools and contribute to peer review and shared documentation.

Qualifications

You should bring:

 

• At least 4+ years in vulnerability research, reverse engineering, exploit development, or closely related security engineering.
• Bachelor’s degree in Computer Engineering, Computer Science, or a related technical field. Additional years of experience may substitute for degree.
• Demonstrated ability to complete investigations independently, from initial signal to PoC and final report.
• Depth in at least one relevant technical area, such as native applications, operating systems, firmware, or web services.
• Strong programming and debugging skills.
• Hands-on experience configuring and using LLMs and agent harnesses for technical work.
• Clear technical writing and sound judgment about evidence, uncertainty, and research priorities.

Preferred:

• Experience with fuzzing, program analysis, harness development, or research automation would be valuable.

Security Clearance:

 

• Active Top Secret/SCI clearance.
• U.S. Citizenship is required.

About i3

i3 is a technically diverse, 100% team member owned business, headquartered in Huntsville, Alabama specializing in missile and aviation systems engineering and logistic services, electronic warfare and electromagnetic effects analysis, UAS system integration and flight operations, full lifecycle C5ISR engineering services, cybersecurity and IT/IA innovative solutions and virtual training, simulation & serious game development and implementation. We have established a broad offering of products and capabilities collectively providing decades of experience supporting the full complement of DoD military services, Missile Defense Agency, National Aeronautics and Space Administration, and a variety of other Government organizations and private industry customers.