{"id":3292591,"url":"https://alion.io/job/horizon3-senior-attack-engineer-internal-systems","title":"Senior Attack Engineer, Internal Systems","company":{"id":3088,"name":"Horizon3","domain":"horizon3.ai","url":"https://alion.io/company/horizon3","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"B","score":80,"open_postings":24,"ghost_share":0,"stale_share":0.792,"repost_share":0,"time_to_fill_p50_days":39,"computed_at":"2026-10-31T05:58:55Z"}},"role":"Industrial Engineering","role_family":"Industrial Engineering","seniority":"senior","employment_type":"full_time","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"posting_text","remote_working_hours":null,"hiring_geo_confidence":"structured","locations":[],"countries":[],"hiring_countries":["US"],"hiring_countries_total":1,"salary":{"min":206278,"max":242680,"currency":"USD","period":"year","gross":null,"usd_annual":242680},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":true,"technologies":[{"name":"Active Directory","optional":false},{"name":"BloodHound","optional":false},{"name":"Docker","optional":false},{"name":"Impacket","optional":false},{"name":"Kubernetes","optional":false},{"name":"LLM","optional":false},{"name":"Neo4j","optional":false},{"name":"NetExec","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Python","optional":false},{"name":"Red Teaming","optional":false},{"name":"Windows","optional":false}],"status":"live","first_seen_at":"2026-10-26T18:21:00Z","employer_posted_date":"2026-10-26","last_verified_at":"2026-10-31T23:54:04Z","board_verified":true,"closed_at":null,"days_open":5,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":5},"description":"Get to Know Us\nHorizon3.ai is a fast-growing, remote cybersecurity company dedicated to the mission of enabling organizations to proactively find, fix and verify exploitable attack vectors before criminals exploit them. Our flagship product, the NodeZeroTM platform, delivers production-safe autonomous pentests and other key assessment operations that scale across the largest internal, external, cloud, and hybrid cloud environments. NodeZero has been adopted by organizations of all sizes, from small educational institutions to government agencies and Global 100 enterprises. It is used by IT Ops/SecOps teams, consulting pentesters, and MSSPs and MSPs.\nWe are a fusion of former U.S. Special Operations cyber operators, startup engineers & operators, and formerly frustrated cybersecurity practitioners. We're committed to helping solve our common security problems: ineffective security tools and false positives, resulting in alert fatigue, blind spots, \"checkbox” security culture, cybersecurity skills shortage, and the long lead time and expense of hiring outside consultants. Collectively, we are a team of learn it alls, committed to a culture of respect, collaboration, ownership, and results.\nAn Overview\nWe're seeking a Senior Attack Engineer who blends deep software engineering expertise with a passion for cybersecurity. In this role, you’ll independently lead complex internal network and Active Directory attack projects in NodeZero, our autonomous pentesting platform.\nInternal enterprise networks and Active Directory remain key targets in modern breaches, and it is exactly where our customers most need NodeZero to find and safely prove exploitable attack paths. The environments we operate in are hardening fast, while tradecraft continues to evolve across network protocols, identity systems, management planes, and hybrid environments. We need someone who can research and weaponize real-world vulnerabilities and misconfigurations into reliable product capabilities.\nYou'll design and build production-grade systems that drive the offensive capabilities of the NodeZero platform. You'll own complex attack capabilities from research and technical design through production delivery and ongoing operation, making consequential technical decisions within the internal network scope. You'll also strengthen the team through proactive mentorship, thoughtful code reviews, and improvements to our engineering and research practices.\nThis is not consulting or manual pentesting. The goal is to turn cutting-edge, often manual techniques into safe, reliable, repeatable autonomous attacks that scale across the largest internal environments in the world. If you love both breaking internal network infrastructure and building scalable software to automate it, this is the seat.\nWhat You’ll Do\nResearch and develop novel attack capabilities for integration into the NodeZero platform, focusing on autonomous red teaming, internal network breach techniques, and offensive security automation.\n\nResearch emerging internal tradecraft (network protocol exploitation, Active Directory abuse, management-plane attacks, delegation, credential access, and hybrid identity pivots) and turn it into production attack content.\n\nDesign, build, and maintain production-grade Python systems, making clear tradeoffs between attack effectiveness, operational safety, reliability, scalability, and maintainability.\n\nAcquire, configure, and exploit modern, hardened internal test environments to validate and demonstrate complex attack scenarios.\n\nMonitor public vulnerability databases and threat intelligence sources to stay current on emerging threats and incorporate them into internal network attack modules.\n\nExtend and maintain platform architecture and graph data models for new identity, privilege-escalation, and lateral-movement paths.\n\nHelp shape the team's coverage priorities using customer needs, threat intelligence, and emerging techniques; scope deliverable projects and proactively raise risks and tradeoffs.\n\nMentor teammates and improve team processes, code quality, architectural standards, and research safety practices.\n\nPartner cross-functionally with engineers, product managers, and customer-facing teams to resolve issues, enhance features, author technical documentation, and drive customer value.\n\nWhat You’ll Bring\nDeep, hands-on offensive security experience against internal enterprise networks and Active Directory, from initial foothold through domain and enterprise compromise.\n\nExpert-level proficiency in Python for large-scale development and a track record of shipping and maintaining tested, documented, production-quality code.\n\nStrong command of internal network attack techniques, including network protocol exploitation, privilege escalation, lateral movement, and credential access.\n\nExperience with object-oriented design, API integration, data structures, and building scalable system components in fast-paced product environments.\n\nExperience designing complex software components or systems, accounting for extensibility, operational safety, performance, and long-term maintenance, and explaining the reasoning behind architectural decisions.\n\nA track record of independently leading complex, high-impact technical projects with significant risk, making sound decisions under ambiguity, and identifying business implications and delivery risks before they become critical issues.\n\nStrong written and verbal communication, including clear technical documentation and the ability to explain design choices, risks, and tradeoffs to engineers and non-technical stakeholders.\n\nDemonstrated investment in teammates' growth through proactive mentorship, architectural feedback, and code reviews, along with experience improving team processes, tooling, or technical standards.\n\nOffensive security and software engineering background with a strong passion for turning security research into safe, maintainable product capabilities.\n\nWhat Sets You Apart\nOSCP (or OSEP, CRTO, or equivalent offensive certifications).\n\nExperience researching and implementing attacks against SCCM, Windows Admin Center, and other modern Windows management-plane attack surfaces.\n\nFamiliarity with containerization (Docker, Kubernetes) and working with relational (Postgres) and graph (Neo4j) databases.\n\nExperience developing or contributing to offensive tooling like BloodHound, Impacket, netexec, etc.\n\nHands-on experience with graph databases (Neo4j) and attack-path analysis, including extending models to represent new identity and privilege relationships.\n\nExperience integrating security research into production, multi-tenant SaaS, with attention to testing, reliability, and customer safety.\n\nPublic contributions to the field: open-source tools, technical blog posts, conference talks, or published CVEs.\n\nExperience building production-safe autonomous or automated offensive tooling, including applying AI/LLM technologies to enhance attack workflows.\n\nTravel Required\nWe are a fully remote company, and this job may require up to 10% of travel to be successful.\nCompensation and Values\nAt Horizon3, we believe that our people are our greatest asset, and our compensation philosophy reflects this core value. We are committed to fostering an environment where all employees feel valued, respected, and rewarded for their contributions. Our compensation structure is designed to be fair, competitive, and transparent, ensuring that every team member is recognized and compensated equitably across roles, levels, and locations.\nIn accordance with various State’s transparency regulations, we provide the following salary range information for this position:\nBase salary range: $206,278 - $242,680. The exact salary will be determined based on the selected candidate’s location, qualifications, experience, and relevant skills.\n\nAdditional compensation: All full-time roles are eligible for an equity package in the form of stock options.\n\nPerks ofHorizon3\nInclusive Team: We value diversity and promote an inclusive culture where everyone can thrive.\n\nGrowth Opportunities: Be part of a dynamic and growing team with numerous career development opportunities.\n\nInnovative Culture: Work in a collaborative environment that encourages creativity and out-of-the-box thinking.\n\nHybrid & Remote Work: We embrace a mix of remote and hybrid work models depending on role and location, including our Chicago office, where some roles require regular in-office presence.\n\nCompetitive Compensation: We offer competitive salary, equity and benefits. Our benefits include health, vision & dental insurance for you and your family, a flexible vacation policy, and generous parental leave.\n\nYou Belong Here\nHorizon3 is not just an equal opportunity employer - we are a community that values diversity, equity, and inclusion as fundamental principles of our culture and success. We are dedicated to fostering a workplace where everyone feels welcome and respected, regardless of race, color, religion, sex, national origin, age, disability, veteran status, sexual orientation, gender identity or expression, genetic information, marital status, hair length or any other legally protected status by law.\nOur commitment to diversity and inclusion means we strive to attract, develop, and retain a workforce that reflects the varied communities we serve. We believe that diverse perspectives drive innovation and strengthen our ability to create cutting-edge cybersecurity solutions. At Horizon3, every team member is valued and supported in an environment that encourages personal and professional growth.\nWe welcome candidates from all backgrounds and experiences, and we encourage all qualified individuals to apply. Come be a part of Horizon3, where your unique contributions are recognized, and your potential is limitless.\nOther Duties\nPlease note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee. Duties, responsibilities, and activities may change at any time with or without notice.\nApplication Note\nIn any materials you submit, you may redact or remove age-identifying information such as age, date of birth, or dates of school attendance or graduation. You will not be penalized for redacting or removing this information.","description_format":"text","description_chars":10355,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Dental insurance","Equity","Flexible vacation policy","Growth opportunities","Hybrid work","Parental leave","Stock options"],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Penetration Testing","Vulnerability Management","Cybersecurity AI"],"lifecycle":[{"event":"open","at":"2026-10-26T20:33:53Z"}],"visa":[],"liveness":{"score":63,"band":"ok","label":"Likely open","p_open":1,"p_active":0.632,"p_room":1,"age_days":4,"expected_fill_days":39,"reasons":["conf:0","stale_co","velocity","win:early","comp:brand"],"computed_at":"2026-10-31T05:58:55Z"},"pay":{"stated_usd_annual":242680,"is_top_pay":true},"html_url":"https://alion.io/job/horizon3-senior-attack-engineer-internal-systems","json_url":"https://alion.io/job/horizon3-senior-attack-engineer-internal-systems.json","meta":{"generated_at":"2026-10-31T23:54:56Z","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":37495,"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":3088},"rest":"https://alion.io/mcp/rest/get_company?id=3088"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fhorizon3-senior-attack-engineer-internal-systems"},{"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%2Fhorizon3-senior-attack-engineer-internal-systems"},{"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%2Fhorizon3-senior-attack-engineer-internal-systems"},{"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/horizon3-senior-attack-engineer-internal-systems\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fhorizon3-senior-attack-engineer-internal-systems"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":3292591}},{"tool":"search_jobs","arguments":{"company":"horizon3.ai","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":3292591},"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. Docs: https://alion.io/developers"}}