Arsiem
Arsiem6mo ago

Network Based Systems Analyst III

United StatesUnited States·ArlingtonFull-timemid
OtherSystems AnalystBusiness Analysis & Process
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Quick Summary

Overview

About ARSIEM Corporation At ARSIEM Corporation we are committed to fostering a proven and trusted partnership with our government clients. We provide support to multiple agencies across the United States Government.

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About ARSIEM Corporation

At ARSIEM Corporation we are committed to fostering a proven and trusted partnership with our government clients.  We provide support to multiple agencies across the United States Government.  ARSIEM has an experienced workforce of qualified professionals committed to providing the best possible support.

As demand increases, ARSIEM continues to provide reliable and cutting-edge technical solutions at the best value to our clients.  That means a career packed with opportunities to grow and the ability to have an impact on every client you work with. 

ARSIEM is looking for a Cyber Network Defense Analyst to monitor network activity and identify and report events that occur, or might occur, within the network, in order to protect information, information systems, and networks from threats. CNDAs review data collected to analyze cyber events and the network environment, identifying trends, patterns, or anomaly correlations that indicate more serious attacks or future threats. The CNDAs will recommend proactive measures to contain the incident. These proactive measures include, but are not limited to, identifying intruders, local changes/suspect interactions; isolation; in-depth digital media analysis; consultation with law enforcement or counterintelligence organizations; development of signatures to detect this malicious behavior; and development and deployment of eradication tools.  This position will support one of our Government clients in Arlington, VA.
  • The majority of the CNDA's time (75%) will be spent executing the following tasks:
  • Characterize and analyze network traffic to identify anomalous activity and potential threats to network resources
  • Coordinate with enterprise-wide cyber defense staff to validate network alerts
  • Document and escalate incidents (including the event's history, status, and potential impact for further action) that may cause ongoing and immediate impact on the environment
  • Perform cyber defense trend analysis and reporting
  • Perform event correlation using information gathered from a variety of sources within the enterprise to gain situational awareness and determine the effectiveness of an observed attack.
  • Provide daily summary reports of network events and activity relevant to cyber defense practices.
  • Receive and analyze network alerts from various sources within the enterprise and determine possible causes of alerts.
  • Provide timely detection, identification, and alerting of attacks/intrusions, anomalous activities, and misuse activities, and distinguish these incidents and events from benign activities.
  • Utilize cyber defense tools for continuous monitoring and analysis of system activity to detect malicious activity.
  • Analyze identified malicious activity to determine weaknesses exploited, exploitation methods, effects on the system, and information.
  • Determine tactics, techniques, and procedures (TTPs) for intrusion sets
  • Examine network topologies to understand data flows through the network
  • Identify and analyze anomalies in network traffic using metadata
  • Conduct research, analysis, and correlation across a wide variety of all source data sets (indications and warnings)
  • Validate intrusion detection system (IDS) alerts against network traffic using packet analysis tools
  • Identify applications and operating systems of a network device based on network traffic
  • Reconstruct a malicious attack or activity based on network traffic
  • Identify network mapping and operating system (OS) fingerprinting activities
  • Assist in the construction of signatures that can be implemented on cyber defense network tools in response to new or observed threats within the network environment or enclave
  • Notify designated managers, cyber incident responders, and cybersecurity service provider team members of suspected cyber incidents and articulate the event's history, status, and potential impact for further action in accordance with the organization's cyber incident response plan
  •  
  • Approximately 25% of the CNDA's time will be spent executing the following tasks:
  • Prepare and update manuals, instructions, and operating procedures
  • Evaluate established methods and procedures and prepare recommendations for changes in methods and practices where appropriate.
  • Plan and execute challenging and complex assignments, and develop innovative methods, approaches, and procedures.
  • Conduct analyses and recommend resolutions for complex issues affecting the specialty area.
  • Ensure optimal use of commercially available products
  • Prepare and present reports
  • Evaluate the effectiveness of installed systems and services
    •  
  • BS Computer Science, Cyber Security, Computer Engineering, or related degree; or HS Diploma & 7-9 years of network investigations experience.
  • 5+ years of direct relevant experience in cyber defense analysis using leading-edge technologies and industry-standard cyber defense tools
  • Experience successfully developing and deploying signatures
  • Experience detecting host and network-based intrusions via intrusion detection technologies (e.g., Snort)
  • Experience implementing incident handling methodologies
  • Experience implementing protocol analyzers
  • Experience collecting data from a variety of cyber defense resources
  • Experience reading and interpreting signatures (e.g., Snort)
  • Experience performing packet-level analysis
  • Experience conducting trend analysis
  • GSEC (SANS401), ArcSight (or other SIEM solution), Network+, Security+, and Python programming experience would be ideal.
  • Strong math and science background.
  • Experience with the Carnegie Mellon SiLK tool suite.
  • GNFA, GCIH, GCIA, GSEC, CASP+, CySA+, PaLMS, FedVTE

    • Location & Eligibility

    Where is the job
    Arlington, United States
    On-site at the office
    Who can apply
    US
    Listed under
    United States

    Listing Details

    Posted
    November 4, 2025
    First seen
    April 8, 2026
    Last seen
    May 11, 2026

    Posting Health

    Days active
    33
    Repost count
    0
    Trust Level
    31%
    Scored at
    May 11, 2026

    Signal breakdown

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    ARSIEM Corporation is an IT consulting firm specializing in cybersecurity solutions and training for government and private sector clients.

    Employees
    125
    Founded
    2013
    Domain
    arsiem.com
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