--- title: 'IT Security Engineer at Twenty' canonical: 'https://feeny.ai/job/it-security-engineer-twenty-arlington-ghw0n54mkva0' type: 'job' last_seen: '2026-09-07' --- # IT Security Engineer at Twenty - **Company:** Twenty - **Location:** Arlington, VA - **Compensation:** $116k–$195k - **Employment:** full-time - **Work type:** onsite - **Posted:** 2026-07-07 - **Last confirmed live:** 2026-09-07 - **Apply:** https://jobs.ashbyhq.com/twenty/e78dcbbb-532f-4097-9282-aa8e8410c7c7 ## Job description ## ABOUT THE COMPANY America is under sustained cyber attack. Our adversaries infiltrate our networks, steal our IP, and degrade the digital infrastructure that modern life runs on. They’ve learned—correctly—that those attacks rarely produce consequences. Twenty was founded to change that, by making our adversaries think twice before they attack us. Our vision is American and allied primacy in cyberspace—a future where they cannot contest us, deterrence is assured, and the free world remains secure. Founded in 2024, Twenty Technologies (www.twenty.io http://www.twenty.io) industrializes offensive cyber operations for the U.S. and its allies. Headquartered in Arlington, Virginia, Twenty has raised $168M from Khosla Ventures, Accel, Caffeinated Capital, Friends & Family Capital, Point72 Ventures, General Catalyst, and In-Q-Tel. Mission | On Site | Full Time | U.S. Citizenship Required / No Active Clearance Required ## ROLE SUMMARY We are seeking IT Security Engineer to join our growing technology engineering team. This is a critical role that will establish and maintain our security infrastructure, protect our digital assets, and ensure compliance with industry standards. You will be responsible for implementing comprehensive security solutions across our network, systems, and applications, while working closely with our development and operations teams to embed security into our organizational culture. ## WHAT YOU'LL DO - Design, implement, and maintain enterprise network security architecture, including firewalls, intrusion detection systems, VPNs, and DMZs. - Develop and enforce security policies, standards and procedures across the organization. - Conduct security assessments, vulnerability scans and penetration testing to identify and remediate security gaps. - Monitor systems and networks 24/7 using security information and event management (SIEM) tools; investigate and respond to security incidents. - Manage access controls, identity and access management (IAM), and multi-factor authentication (MFA) solutions. - Establish and manage data loss prevention (DLP) and encryption protocols for sensitive data at rest and in transit. - Perform security hardening of servers, workstations, and endpoints; manage patch management and system updates. - Provide security awareness training and education to employees to foster a security-conscious culture. - Conduct root cause analysis on security incidents and prepare incident response reports and recommendations. - Ensure compliance with relevant regulations (CMMC, SOC 2, GDPR, PCI-DSS, or industry-specific standards as applicable). ## MUST HAVE - Bachelor's degree in Computer Science, Information Security, or related field (or equivalent professional experience). - 5+ years of professional IT security experience, with demonstrated expertise in at least two of the following domains: network security, systems security, or cybersecurity. - Strong knowledge of TCP/IP, DNS, DHCP, and network protocols; experience with firewalls, proxies, and network segmentation. - Hands-on experience with security tools such as Splunk, ELK Stack, Snort, Suricata, or similar SIEM and IDS/IPS platforms. - Proficiency in systems security, including endpoint protection and vulnerability management. - Experience with cloud security (AWS, Azure, or GCP) and containerized environments (Docker, Kubernetes). - Understanding of common attack vectors and security frameworks (NIST, CIS Controls, OWASP Top 10). - Excellent problem-solving skills with the ability to work independently and as part of a team. - Strong communication skills to explain complex security concepts to non-technical stakeholders. ## NICE TO HAVE - Security certifications such as CISSP, CISM, CEH, CCNA Security, Security+, or similar. - Experience with security automation and Infrastructure as Code (Terraform, Ansible). - Knowledge of application security testing (SAST/DAST) and secure development practices. - Experience with incident response and forensics investigations. - Familiarity with compliance frameworks and audit processes. ## Benefits What's on the table: - Health. Medical, dental, and vision plan options. Life / AD&D, disability coverage options. - Family. Paid parental leave for eligible full-time employees. 12 weeks for birthing parents, 4 for non-birthing parents, 6 weeks for adoptive, foster, or intended parents through surrogacy. - Vacation. Paid holidays and flexible PTO. Take what you need. - Retirement. 401(k) with pre-tax and Roth options. HSA/FSA options, dependent care FSA. Benefits vary by location, role, and eligibility. Full plan details provided during the interview and offer process. If this role sounds like you, apply and share with us your interest Due to U.S. government contract and security requirements, this role is limited to U.S. citizens. Some positions may also require eligibility to obtain and maintain a U.S. Government security clearance. Any active clearance requirement will be listed in the role description. Twenty is an equal opportunity employer. We consider all qualified applicants without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, veteran status, disability, or any other protected status, consistent with applicable law. If you need a reasonable accommodation during the hiring process, let us know and we will work with you. ## About Twenty ## Company Overview - **One-liner**: Twenty builds and scales the software and capabilities of modern cyber conflict, industrializing the American arsenal for the war of now. - **Entity Type**: Private (Series B; $138M total funding as of June 2026) - **Headquarters**: Arlington, Virginia, United States - **Founded**: 2024 - **Founders**: Joe Lin (CEO), Peter S., Skyler O. ## Core Business - **Primary industry**: Cyber warfare and national security (Computer and Network Security) - **Target customers**: U.S. military and Intelligence Community (B2G) - **Mission**: Deliver industrial-scale cyber capabilities, ensuring the U.S. and its allies are able to deter and defeat their adversaries [twenty.io/careers](https://twenty.io/careers/). ## Products & Services - **Cyber Warfare Platform**: Intelligent, autonomous end-to-end systems that accelerate the entire offensive cyber operations lifecycle. Encodes elite tradecraft directly into software, transforming workflows that once took weeks of manual effort into automated, continuous operations across hundreds of targets simultaneously. [twenty.io](https://twenty.io/) ## Market Standing - **Valuation/Market Cap**: Not disclosed - **Key Metric**: Total funding $138M (as of June 2026), including a $38M Series A led by Caffeinated Capital in November 2025 and a subsequent $100M round in June 2026 [aventure.vc](https://aventure.vc/companies/twenty-arlington-va-us) [prnewswire.com](https://www.prnewswire.com/news-releases/twenty-raises-38m-to-transform-cyber-warfare-at-industrial-scale-302622230.html) - **Notable Investors/Partners**: Caffeinated Capital, General Catalyst, In-Q-Tel, Accel, Point72 Ventures, Friends & Family Capital [twenty.io/careers](https://twenty.io/careers/) - **Growth Signals**: Headcount grew 245% YoY, reaching ~50 employees; 34+ active job postings as of July 2026; emerged from stealth in November 2025 with over $100M in government contracts [linkedin.com](https://www.linkedin.com/company/twentytechnologies) [prnewswire.com](https://www.prnewswire.com/news-releases/twenty-raises-38m-to-transform-cyber-warfare-at-industrial-scale-302622230.html) ## Competitive Advantages - **Elite team**: Composed of the top 0.1% of cyber operators (from USCYBERCOM, NSA, DHS, U.S. Marine Corps, Navy, Army) and proven builders (from Palantir, Palo Alto Networks, Expanse) [twenty.io/careers](https://twenty.io/careers/) - **Proven track record**: The founding team built the most successful SaaS cyber product in U.S. military history and defended tens of thousands of networks [twenty.io](https://twenty.io/) - **100X improvement**: Industrial-scale automation replaces manual, bespoke methods, fundamentally reshaping how the U.S. and allies engage in cyber conflict [twenty.io](https://twenty.io/) - **Strategic backing**: Supported by top defense-tech VCs and In-Q-Tel (the CIA’s venture arm) ## Strategic Focus - Accelerating the delivery of intelligent, autonomous cyber warfare systems to close critical gaps in U.S. offensive capabilities - Countering adversaries such as the People’s Republic of China (PRC) in the cyber domain - Expanding partnerships across the U.S. military and Intelligence Community, with deployments already in active combat operations [prnewswire.com](https://www.prnewswire.com/news-releases/twenty-raises-38m-to-transform-cyber-warfare-at-industrial-scale-302622230.html) ## Why Work Here - **Mission-driven impact**: Your code directly affects mission success or failure — “the difference between mission success and mission failure” [twenty.io/careers](https://twenty.io/careers/) - **Elite peer group**: Work alongside top 0.1% cyber operators and world-class technologists - **Rapid growth**: 245% headcount increase YoY; 39 open roles across engineering, product, finance, growth, and talent [twenty.io/careers](https://twenty.io/careers/) - **Culture**: “Serious work, savage wit, zero excuses.” Emphasis on solving “crazy-hard problems” that nation-state adversaries face. “No one is coming to save us, so we’d better do it ourselves.” [twenty.io/careers](https://twenty.io/careers/) - **Work environment**: Primarily on-site at secure locations (Arlington, VA HQ; Fort Meade, MD; San Antonio, TX; Augusta, GA). Most roles require relocation to the Washington, DC area or other government facilities. [twenty.io/careers](https://twenty.io/careers/) - **Notable perks**: Not explicitly detailed, but the focus is on building revolutionary capabilities for national security rather than typical engagement metrics. ## Sources 1. [twenty.io](https://twenty.io/) 2. [twenty.io/careers](https://twenty.io/careers/) 3. [linkedin.com](https://www.linkedin.com/company/twentytechnologies) 4. [prnewswire.com](https://www.prnewswire.com/news-releases/twenty-raises-38m-to-transform-cyber-warfare-at-industrial-scale-302622230.html) 5. [aventure.vc](https://aventure.vc/companies/twenty-arlington-va-us) ## Other roles at Twenty - [Accounting Manager (First Hire)](https://feeny.ai/job/accounting-manager-first-hire-twenty-arlington-j2ngp8bfzya1) — Arlington, VA - [Senior Accountant (First Hire)](https://feeny.ai/job/senior-accountant-first-hire-twenty-arlington-at0x228y6rbj) — Arlington, VA - [Senior / Staff Forward Deployed Software Engineer - TS/SCI Cleared](https://feeny.ai/job/senior-staff-forward-deployed-software-engineer-ts-sci-cleared-twenty-chantilly-sjhj4pgb897b) — Chantilly, VA - [Staff Product Manager](https://feeny.ai/job/staff-product-manager-twenty-new-york-smpbxyp29dwt) — New York, NY - [Director, Software Engineering](https://feeny.ai/job/director-software-engineering-twenty-arlington-x1e02f23d4cs) — Arlington, VA - [Engineering Manager, Platform Team](https://feeny.ai/job/engineering-manager-platform-team-twenty-arlington-g1m4yknrachh) — Arlington, VA - [Strategic Finance and Business Operations Associate (Relocation to Washington, DC)](https://feeny.ai/job/strategic-finance-and-business-operations-associate-relocation-to-washington-dc-9z8te2v40xch) — New York, NY - [Strategic Finance and Business Operations Associate](https://feeny.ai/job/strategic-finance-and-business-operations-associate-twenty-arlington-vh3tn5y5c4n8) — Arlington, VA - [Strategic Finance and Business Operations Associate (Relocation to Washington, DC)](https://feeny.ai/job/strategic-finance-and-business-operations-associate-relocation-to-washington-dc-n357t6m7cx5b) — San Francisco, CA - [DevOps Engineer](https://feeny.ai/job/devops-engineer-twenty-arlington-qfn39nmxy8ha) — Arlington, VA