{"id":3409303,"url":"https://alion.io/job/markon-solutions-information-systems-security-engineer-3","title":"Information Systems Security Engineer","company":{"id":3863685,"name":"Markon Solutions","domain":"markonsolutions.com","url":"https://alion.io/company/markon-solutions","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"iCIMS","truth_index":null},"role":"Security","role_family":"Security","seniority":"senior","employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Chantilly, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":175000,"max":205000,"currency":"USD","period":"year","gross":null,"usd_annual":205000},"salary_estimate":null,"experience_years_min":8,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agile","optional":false},{"name":"CI/CD","optional":false},{"name":"ETL/ELT","optional":false},{"name":"JavaScript","optional":false},{"name":"LLM","optional":false},{"name":"Neo4j","optional":false},{"name":"Python","optional":false}],"status":"live","first_seen_at":"2026-10-28T17:12:57Z","employer_posted_date":"2026-10-28","last_verified_at":"2026-10-31T05:51:51Z","board_verified":true,"closed_at":null,"days_open":2,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":2},"description":"Description\nMarkon is seeking an experienced Systems Engineer specializing in Information Systems Security Engineering (ISSE) and Data Engineering to support an Intelligence Community client in Chantilly, Virginia. This position will design, secure, integrate, and optimize mission-critical cloud and data solutions within classified environments, combining systems engineering principles, cybersecurity compliance, advanced analytics, and modern data engineering practices. The Systems Engineer will work across secure cloud architectures, ETL pipelines, graph databases, and AI/ML-supporting technologies to deliver scalable, compliant solutions aligned with mission requirements.\nResponsibilities\nLead Information Systems Security Engineering (ISSE) activities throughout the system lifecycle, including security architecture development, security control implementation, and compliance with NIST and Sponsor-specific requirements.\n\nDevelop and maintain Assessment and Authorization (A&A) documentation supporting Authorization to Operate (ATO), including System Security Plans (SSPs), Plans of Action and Milestones (POA&Ms), test procedures, and continuous monitoring artifacts.\n\nConduct security scans, vulnerability assessments, patch management, and remediation activities across classified cloud and on-premises environments.\n\nIntegrate security-by-design principles into system architectures, data flows, ETL pipelines, and operational workflows.\n\nDesign, develop, and optimize Extract, Transform, Load (ETL) pipelines supporting enterprise data integration, advanced analytics, and AI/ML initiatives.\n\nDevelop and maintain Neo4j graph database solutions, including data modeling, relationship mapping, schema optimization, and Cypher query development.\n\nClean, preprocess, analyze, and visualize medium-to-large datasets to support mission analysis and operational decision-making.\n\nDevelop secure software components using technologies such as Cypher, Python, Java, and JavaScript.\n\nPerform technical and functional assessments, risk analysis, cost estimation, trade studies, and systems engineering evaluations.\n\nSupport secure cloud architectures, virtualization technologies, and scalable data solutions within mission environments.\n\nCollaborate with systems engineers, developers, security teams, and mission stakeholders to ensure solutions meet technical, accreditation, and operational requirements.\n\nParticipate in Agile development activities, including sprint planning, iterative development, and CI/CD processes.\n\nMaintain comprehensive documentation covering technical requirements, data models, engineering decisions, software components, and security compliance.\n\nQualifications\nRequired:\nActive TS/SCI clearance with Full Scope Polygraph (FSP).\n\nBachelor's degree and at least 8 years of relevant experience, including 2 years of Sponsor experience; OR\nMaster's degree and at least 6 years of relevant experience, including 2 years of Sponsor experience; OR\n\nPhD and at least 3 years of relevant experience, including 2 years of Sponsor experience.\n\nAn additional 4 years of relevant experience may be considered in lieu of a degree.\n\nDemonstrated experience designing, securing, and maintaining data flow solutions within classified or high-security environments.\n\nStrong ISSE experience, including security architecture, A&A/ATO processes, vulnerability management, accreditation documentation, and continuous monitoring.\n\nHands-on experience developing ETL pipelines, data models, activity models, and data engineering solutions supporting AI/ML initiatives.\n\nProficiency in at least one programming language, such as Cypher, Python, Java, or JavaScript.\n\nExperience with graph database technologies, with Neo4j and Cypher expertise preferred.\n\nExperience cleaning, modeling, analyzing, and visualizing medium-to-large datasets.\n\nExperience supporting Sponsor mission systems or classified programs.\n\nStrong written and verbal communication skills with the ability to explain complex technical concepts to both technical and nontechnical stakeholders.\nDesired:\nExperience with enterprise data strategy, data governance, data stewardship, and metadata management.\n\nExperience developing dashboards, technical visualizations, or system-level data representations.\n\nExposure to AI/ML and large language model (LLM) systems, including associated data engineering workflows.\n\nFamiliarity with Agile development methodologies and cloud-native architecture patterns.\n\nHands-on experience with Neo4j graph databases and advanced Cypher query development.\n\nSalary Range\nUSD $175,000.00 - USD $205,000.00 /Yr.The Markon 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 the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.Overview\nEager to join a team where your skills are valued, your growth is nurtured, and your impact is profound? Look no further than Markon, a premier consulting firm deeply dedicated to advancing our nation's most critical missions.\nAt Markon, we don't just offer jobs - we offer opportunities for personal and professional transformation. Empowering our employees to lead, innovate, and excel, we foster an environment where new ideas are not just welcomed but celebrated. As a perennial Washington Post Top Workplace, we prioritize the well-being and success of our team members, ensuring they can bring their best selves to work.\nHeadquartered in Falls Church, Virginia, Markon has garnered national recognition for our unwavering dedication to excellence in serving the intelligence community, as well as federal civilian and defense agencies. Our growing reach extends across 17 states, 116 countries, and 5 continents, where our team of dynamic professionals collaborates to deliver unparalleled program and project management services.\nMarkon values people and the tremendous impact each individual can make - which is why we’re consistently recognized as one of the best places to work in federal government consulting. Here, you can help solve the nation’s most important challenges, surrounded by colleagues who help you grow, advance, and succeed. We are deeply dedicated to what matters - bringing out the best in each other to advance our clients’ missions.Join us and make a meaningful impact.\nMarkon is an Equal Opportunity/Affirmative Action Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, gender identity, national origin, age, protected veteran status, or disability status.","description_format":"text","description_chars":6826,"description_truncated":false,"requirements":{"experience_years_min":8,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":true,"languages":[]},"benefits":["Equity"],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Intelligence","IT Consulting & Digital Transformation","Facilities Management"],"lifecycle":[{"event":"open","at":"2026-10-28T17:12:57Z"}],"visa":[],"liveness":{"score":100,"band":"hot","label":"Hiring now","p_open":1,"p_active":1,"p_room":1,"age_days":2,"expected_fill_days":16,"reasons":["conf:0","wave","urgency","velocity","win:early","comp:brand"],"computed_at":"2026-10-31T05:58:55Z"},"pay":{"stated_usd_annual":205000,"is_top_pay":true},"html_url":"https://alion.io/job/markon-solutions-information-systems-security-engineer-3","json_url":"https://alion.io/job/markon-solutions-information-systems-security-engineer-3.json","meta":{"generated_at":"2026-10-31T07:11:20Z","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":10593,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-01T00:00:00Z"}},"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":3863685},"rest":"https://alion.io/mcp/rest/get_company?id=3863685"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fmarkon-solutions-information-systems-security-engineer-3"},{"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%2Fmarkon-solutions-information-systems-security-engineer-3"},{"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%2Fmarkon-solutions-information-systems-security-engineer-3"},{"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/markon-solutions-information-systems-security-engineer-3\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fmarkon-solutions-information-systems-security-engineer-3"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":3409303}},{"tool":"search_jobs","arguments":{"company":"markonsolutions.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":3409303},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); https://alion.io/mcp with an Alion account has everything. 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