{"id":1725240,"url":"https://alion.io/job/arsiem-network-based-systems-analyst-iii-2","title":"Network Based Systems Analyst III","company":{"id":668767,"name":"ARSIEM","domain":"arsiem.com","url":"https://alion.io/company/arsiem","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Lever","truth_index":{"grade":"C","score":68,"open_postings":45,"ghost_share":0.444,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":112,"computed_at":"2026-10-17T05:46:00Z"}},"role":"Analytics","role_family":"Analytics","seniority":"middle","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Arlington, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":78000,"max_usd":148000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":900},"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Snort","optional":false},{"name":"Python","optional":true},{"name":"SIEM","optional":true}],"status":"live","first_seen_at":"2025-11-04T17:11:07Z","employer_posted_date":"2025-11-04","last_verified_at":"2026-10-17T21:02:24Z","board_verified":true,"closed_at":null,"days_open":347,"trust":{"level":"ghost","repost_count":0,"flags":["stale","company_stale"],"days_open":346},"description":"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.\nResponsibilities\nThe majority of the CNDA's time (75%) will be spent executing the following tasks:\nCharacterize and analyze network traffic to identify anomalous activity and potential threats to network resources\nCoordinate with enterprise-wide cyber defense staff to validate network alerts\nDocument 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\nPerform cyber defense trend analysis and reporting\nPerform 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.\nProvide daily summary reports of network events and activity relevant to cyber defense practices.\nReceive and analyze network alerts from various sources within the enterprise and determine possible causes of alerts.\nProvide timely detection, identification, and alerting of attacks/intrusions, anomalous activities, and misuse activities, and distinguish these incidents and events from benign activities.\nUtilize cyber defense tools for continuous monitoring and analysis of system activity to detect malicious activity.\nAnalyze identified malicious activity to determine weaknesses exploited, exploitation methods, effects on the system, and information.\nDetermine tactics, techniques, and procedures (TTPs) for intrusion sets\nExamine network topologies to understand data flows through the network\nIdentify and analyze anomalies in network traffic using metadata\nConduct research, analysis, and correlation across a wide variety of all source data sets (indications and warnings)\nValidate intrusion detection system (IDS) alerts against network traffic using packet analysis tools\nIdentify applications and operating systems of a network device based on network traffic\nReconstruct a malicious attack or activity based on network traffic\nIdentify network mapping and operating system (OS) fingerprinting activities\nAssist 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\nNotify 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\n\nApproximately 25% of the CNDA's time will be spent executing the following tasks:\nPrepare and update manuals, instructions, and operating procedures\nEvaluate established methods and procedures and prepare recommendations for changes in methods and practices where appropriate.\nPlan and execute challenging and complex assignments, and develop innovative methods, approaches, and procedures.\nConduct analyses and recommend resolutions for complex issues affecting the specialty area.\nEnsure optimal use of commercially available products\nPrepare and present reports\nEvaluate the effectiveness of installed systems and services\nMinimum Qualifications\nBS Computer Science, Cyber Security, Computer Engineering, or related degree; or HS Diploma & 7-9 years of network investigations experience.\n5+ years of direct relevant experience in cyber defense analysis using leading-edge technologies and industry-standard cyber defense tools\nExperience successfully developing and deploying signatures\nExperience detecting host and network-based intrusions via intrusion detection technologies (e.g., Snort)\nExperience implementing incident handling methodologies\nExperience implementing protocol analyzers\nExperience collecting data from a variety of cyber defense resources\nExperience reading and interpreting signatures (e.g., Snort)\nExperience performing packet-level analysis\nExperience conducting trend analysis\nPreferred Qualifications\nGSEC (SANS401), ArcSight (or other SIEM solution), Network+, Security+, and Python programming experience would be ideal.\nStrong math and science background.\nExperience with the Carnegie Mellon SiLK tool suite.\nGNFA, GCIH, GCIA, GSEC, CASP+, CySA+, PaLMS, FedVTE","description_format":"text","description_chars":5102,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["National Security","Information Security","IT Consulting & Digital Transformation","Custom Software Development"],"lifecycle":[{"event":"open","at":"2026-10-02T21:47:12Z"}],"visa":[],"liveness":{"score":8,"band":"cold","label":"Long shot","p_open":1,"p_active":0.3,"p_room":0.28,"age_days":346,"expected_fill_days":112,"reasons":["conf:0","velocity","ghost","win:tail","crowd:"],"computed_at":"2026-10-17T05:46:00Z"},"pay":null,"html_url":"https://alion.io/job/arsiem-network-based-systems-analyst-iii-2","json_url":"https://alion.io/job/arsiem-network-based-systems-analyst-iii-2.json","meta":{"generated_at":"2026-10-17T21:23:39Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":6002,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-18T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":668767},"rest":"https://alion.io/mcp/rest/get_company?id=668767"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Farsiem-network-based-systems-analyst-iii-2"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Farsiem-network-based-systems-analyst-iii-2"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Farsiem-network-based-systems-analyst-iii-2"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/arsiem-network-based-systems-analyst-iii-2\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Farsiem-network-based-systems-analyst-iii-2"}]}