Cybersecurity Engineer jobs in McLean hiring now at vetted startups and product companies on Alion, updated daily. Average salary around $197,229/year. Compare remote, hybrid and on-site positions with relocation and visa sponsorship. Browse and apply today.
appian.com • HQ: McLean, United States • Workflow & Process Automation (RPA, BPM) • Low-Code & No-Code Platforms • 1001-5000 employees • Est. 1999 • NASDAQ: APPN • Trust B • Hiring 159, 10 new
HQ: McLean, United States • Workflow & Process Automation (RPA, BPM) • Low-Code & No-Code Platforms • 1001-5000 employees • Est. 1999 • NASDAQ: APPN • Trust B • Hiring 159, 10 new
Established in 1999, Appian is a cloud computing and enterprise software company helping organizations build apps and workflows rapidly, with a low-code automation platform. Appian is headquartered in McLean, Virginia.
dminc.com • HQ: Tysons, United States • Mobile App Development Services • IT Help Desk & Service Desk • Managed IT Services (MSP) • IT Consulting & Digital Transformation • 1001-5000 employees • Est. 2002 • Hiring 52, 4 new
HQ: Tysons, United States • Mobile App Development Services • IT Help Desk & Service Desk • Managed IT Services (MSP) • IT Consulting & Digital Transformation • 1001-5000 employees • Est. 2002 • Hiring 52, 4 new
DMI is an American digital services and technology solutions company headquartered in Tysons, Virginia, providing managed IT services including managed mobility, cloud and infrastructure, cybersecurity, network operations, end-user support and application development. It serves federal agencies such as the Federal Trade Commission and the US Senate Sergeant at Arms as well as commercial enterprises, and also offers AI and data, ServiceNow and low-code modernization work. It hires network engineers and NOC staff, service desk analysts, ServiceNow developers and architects, security analysts, data engineers, program managers and customer support staff.
boozallen.com • HQ: McLean, United States • Intelligence • Management Consulting • National Security • IT Consulting & Digital Transformation • 5000+ employees • Est. 1914 • IT services • Trust A • Hiring 1497, 96 new
HQ: McLean, United States • Intelligence • Management Consulting • National Security • IT Consulting & Digital Transformation • 5000+ employees • Est. 1914 • IT services • Trust A • Hiring 1497, 96 new
Booz Allen Hamilton is an American consulting firm founded in 1914 that has spent most of the past century working for the United States government, and today derives almost all of its revenue from federal clients. It supplies technology and mission services to defence, intelligence, civil and health agencies, covering systems engineering, cyber operations, data platforms and increasingly artificial intelligence deployed inside classified environments. Headquartered in McLean, Virginia and listed on the New York Stock Exchange, it employs tens of thousands of security-cleared staff and competes with the other large federal services contractors for multi-year programme awards.
capitalone.com • HQ: McLean, United States • Leasing, Auto & Equipment Finance • Commercial & Retail Banks • Cards & Card Issuing • 5000+ employees • Est. 1994 • Trust B • Hiring 1484, 107 new
HQ: McLean, United States • Leasing, Auto & Equipment Finance • Commercial & Retail Banks • Cards & Card Issuing • 5000+ employees • Est. 1994 • Trust B • Hiring 1484, 107 new
Capital One is an American bank founded in 1994 that began as a credit card monoline built on statistical testing of offers and pricing, an approach it called information-based strategy. It is now one of the largest card issuers in the United States alongside a national direct bank, an auto lending business and a commercial bank, and it completed the acquisition of Discover in 2025, which gave it a payments network of its own rather than dependence on Visa and Mastercard. Headquartered in McLean, Virginia, it was also an early mover among large banks in migrating its entire technology estate to the public cloud.
mitre.org • HQ: McLean, United States • Space & Aerospace • Homeland Security • National Security • Est. 1958 • Hiring 2
HQ: McLean, United States • Space & Aerospace • Homeland Security • National Security • Est. 1958 • Hiring 2
MITRE is an American not for profit corporation that operates federally funded research and development centres for United States government agencies. Its artificial intelligence work spans model assurance, adversarial machine learning and the widely used ATLAS knowledge base of attacks against machine learning systems. The organisation advises defence, aviation, health and cybersecurity agencies and deliberately holds no commercial products of its own; its centres also maintain the ATT&CK framework that security teams everywhere rely on.
mantech.com • HQ: Herndon, United States • IT Consulting & Digital Transformation • Information Security • National Security • 1001-5000 employees • Est. 1968 • Trust A • Hiring 449, 80 new
HQ: Herndon, United States • IT Consulting & Digital Transformation • Information Security • National Security • 1001-5000 employees • Est. 1968 • Trust A • Hiring 449, 80 new
ManTech is a Virginia company founded in 1968 that provides technology services to United States defence and intelligence agencies. Its work covers cybersecurity, data analytics, cloud and mission systems engineering. The company employs thousands of cleared technologists.
salesforce.com • HQ: San Francisco, United States • AI Agents • Team Communication & Collaboration • Marketing Automation • Customer Support & Help Desk Software • BI & Dashboard Software • Marketing & Sales AI • CRM Software • 5000+ employees • Est. 1999 • Trust B • Hiring 1449, 168 new
HQ: San Francisco, United States • AI Agents • Team Communication & Collaboration • Marketing Automation • Customer Support & Help Desk Software • BI & Dashboard Software • Marketing & Sales AI • CRM Software • 5000+ employees • Est. 1999 • Trust B • Hiring 1449, 168 new
Salesforce is an American enterprise software company founded in 1999 that pioneered delivering business applications over the internet rather than as installed software. Its Customer 360 platform brings sales, service, marketing, commerce and analytics onto shared customer data, extended by the Slack collaboration suite, the Tableau analytics business and the MuleSoft integration layer. Headquartered in San Francisco, the company has moved its product strategy toward autonomous agents through Agentforce and the Data Cloud, and it remains the largest customer relationship management vendor in the world by revenue share.
j5consulting.co • HQ: Bowie, United States • Information Technology • IT Infrastructure & Networking Services • IT Consulting & Digital Transformation • 201-500 employees • Est. 2006 • Hiring 64
HQ: Bowie, United States • Information Technology • IT Infrastructure & Networking Services • IT Consulting & Digital Transformation • 201-500 employees • Est. 2006 • Hiring 64
Founded in 2006, J5 Consulting is an information technology and cybersecurity consulting firm headquartered in Bowie, Maryland. Drawing on extensive experience supporting federal government, defense, and commercial enterprises, the company delivers mission-critical IT modernization, enterprise architecture, and cyber defense solutions. Its core service offerings span governance, risk management, and compliance (GRC) audits aligned with NIST and CMMC frameworks, multi-cloud security engineering across AWS and Azure, vulnerability assessments, and continuous monitoring designed to safeguard sensitive assets and maintain regulatory compliance.
steampunk.com • HQ: McLean, United States • Custom Software Development • Digital Government • 1001-5000 employees • Est. 2019 • Hiring 146, 5 new
HQ: McLean, United States • Custom Software Development • Digital Government • 1001-5000 employees • Est. 2019 • Hiring 146, 5 new
Steampunk is a US government technology and design consultancy headquartered in McLean, Virginia, that delivers human-centered design, agile software development, cloud, DevSecOps, data and cybersecurity services to federal agencies. It applies its trademarked Design Intelligence approach to modernization programs for federal clients, combining a start-up culture with a design studio next to its Tysons Corner offices. It hires cloud and enterprise architects, DevSecOps and software engineers, Salesforce and ServiceNow specialists, data engineers, cybersecurity experts, service designers and program and project managers.
leidos.com • HQ: Reston, United States • C4ISR • National Security • Engineering Services • Defense Manufacturing • Systems Integrators • 5000+ employees • Est. 2013 • IT services • Trust B • Hiring 1552, 69 new
HQ: Reston, United States • C4ISR • National Security • Engineering Services • Defense Manufacturing • Systems Integrators • 5000+ employees • Est. 2013 • IT services • Trust B • Hiring 1552, 69 new
Leidos is an American technology and engineering services company created in 2013 when Science Applications International Corporation split in two, with Leidos taking the technical services and solutions business. It is one of the largest suppliers to the United States government, working across defence programmes, intelligence systems, civil agencies including the Federal Aviation Administration, and healthcare services for the Department of Veterans Affairs. Headquartered in Reston, Virginia, the company also builds security detection products for airports and borders, and has concentrated recent investment on trusted artificial intelligence and autonomy for mission environments.
ses.com • HQ: Luxembourg City, Luxembourg • Satellite Manufacturing • Satellite Communications • 1001-5000 employees • Est. 1985 • Hiring 100, 9 new
HQ: Luxembourg City, Luxembourg • Satellite Manufacturing • Satellite Communications • 1001-5000 employees • Est. 1985 • Hiring 100, 9 new
SES is a satellite operator founded in Luxembourg in 1985 and headquartered at Betzdorf. It operates a fleet in geostationary and medium Earth orbit delivering video and data connectivity worldwide. The company merged with Intelsat in 2025 to become one of the largest satellite groups in the world.
amentum.com • HQ: Chantilly, United States • Military Logistics • Business Process Outsourcing (BPO) • Engineering Services • 5000+ employees • Est. 2020 • Trust B • Hiring 991, 148 new
HQ: Chantilly, United States • Military Logistics • Business Process Outsourcing (BPO) • Engineering Services • 5000+ employees • Est. 2020 • Trust B • Hiring 991, 148 new
Amentum is a US government and critical infrastructure services contractor headquartered in Chantilly, Virginia, providing engineering, technical, mission support and operations services in defense, intelligence, space, energy and environment markets. It has about 50,000 employees in more than 70 countries, is listed on the New York Stock Exchange, and absorbed PAE in 2022 before combining with the Jacobs critical mission solutions business in 2024. Openings include aerospace, GN&C and reliability engineers, aircraft workers, database administrators, software engineers, biometric enrollment specialists and paralegals.
gdit.com • HQ: Falls Church, United States • Government • Military • Professional Services • National Security • Digital Government • IT Consulting & Digital Transformation • Systems Integrators • 5000+ employees • Est. 2006 • Trust A • Hiring 1822, 126 new
HQ: Falls Church, United States • Government • Military • Professional Services • National Security • Digital Government • IT Consulting & Digital Transformation • Systems Integrators • 5000+ employees • Est. 2006 • Trust A • Hiring 1822, 126 new
General Dynamics Information Technology, known as GDIT, is the technology services division of the defence contractor General Dynamics and one of the largest suppliers of IT to the United States federal government. It designs, builds and operates networks, cloud environments, cybersecurity and mission applications for defence, intelligence, homeland security and civilian agencies, work that requires a very large security-cleared workforce. The division roughly doubled in scale through the 2018 acquisition of CSRA, and has since concentrated on cloud migration, zero trust architecture and applying artificial intelligence inside accredited government environments.
Headquartered in London, United Kingdom, EY (Ernst & Young) is a multinational professional services network and one of the "Big Four" accounting firms. The organization provides financial assurance and auditing, tax advisory, management and technology consulting, and strategy and transactions advisory through its EY-Parthenon arm. Operating across more than 150 countries, it delivers risk management, digital transformation, data analytics, and regulatory compliance solutions to multinational corporations, financial institutions, and government entities worldwide.
acclaimtechnical.com • HQ: Reston, United States • Recruiting & Staffing • National Security • 51-200 employees • Est. 2000 • Hiring 68, 1 new
HQ: Reston, United States • Recruiting & Staffing • National Security • 51-200 employees • Est. 2000 • Hiring 68, 1 new
Acclaim Technical Services (ATS) is an employee-owned American government contractor headquartered in Reston, Virginia, providing cyber operations, intelligence, language, network infrastructure, engineering and enterprise IT services to the defense and intelligence communities. Founded in 2000 and owned through an employee stock ownership plan, it supports a range of US federal agencies with staff concentrated around Chantilly, Annapolis Junction, McLean and Bethesda. Its openings include AI and machine learning engineers, data scientists, full stack and software developers, system integrators and administrators, infrastructure engineers and UI and UX designers.
americansystems.com • HQ: McLean, United States • National Security • IT Consulting & Digital Transformation • Engineering Services • 51-200 employees • Est. 1975 • Hiring 169, 19 new
HQ: McLean, United States • National Security • IT Consulting & Digital Transformation • Engineering Services • 51-200 employees • Est. 1975 • Hiring 169, 19 new
American Systems is an employee-owned government services contractor headquartered in McLean, Virginia, delivering information technology, engineering and analysis, test and evaluation, and training services to national priority programs. Founded in 1975, it became a majority ESOP company in 1997 and fully employee-owned in 2015, works largely for US defense customers such as the Navy and NAVAIR, and has absorbed the contractor Epsilon. Its openings span aerospace and software engineers, cybersecurity analysts, network and systems administrators, mechanical designers and test engineers, many requiring security clearances.
credence.ai • HQ: Tysons, United States • Information Security • National Security • IT Consulting & Digital Transformation • AI Consulting & Integration • 1001-5000 employees • Trust A • Hiring 89, 20 new
HQ: Tysons, United States • Information Security • National Security • IT Consulting & Digital Transformation • AI Consulting & Integration • 1001-5000 employees • Trust A • Hiring 89, 20 new
Credence is a US government services contractor headquartered in Tysons, Virginia, that provides AI, cloud, data, cybersecurity and modernization services alongside logistics, intelligence, engineering and mission support for defense, health and foreign assistance agencies. The firm reports more than 1,700 team members and over 100 prime contracts, holds vehicles such as GSA OASIS+ and GSA Alliant 3, and supports F-16 and B-2 programs of the Air Force Life Cycle Management Center. It hires systems and avionics engineers, cybersecurity specialists, data and AI engineers, program managers, intelligence planners and administrative staff, many requiring security clearances.
bcore.com • McLean • Springfield • Saint Louis • Reston • Herndon • Intelligence • IT Consulting & Digital Transformation • 201-500 employees • Hiring 53
McLean • Springfield • Saint Louis • Reston • Herndon • Intelligence • IT Consulting & Digital Transformation • 201-500 employees • Hiring 53
Bcore is an American defense and intelligence contractor delivering enterprise IT, cloud, DevSecOps, systems engineering, software development and intelligence analysis to national security customers. Organised into Insight Solutions, Labs and Mission Services divisions, it staffs programs in Northern Virginia, including Herndon, Chantilly, McLean and Springfield, and in Saint Louis, Missouri, where many roles require TS/SCI clearance. Openings include ServiceNow, cloud, HPC and DevSecOps engineers, systems administrators, cyber security systems engineers, software and Python developers, UI and UX designers, technical writers and project managers.
exiger.com • HQ: McLean, United States • Supply Chain AI • RegTech, AML & Compliance • Supply Chain & Logistics Software • 501-1000 employees • Est. 2013 • Trust A • Hiring 52, 4 new
HQ: McLean, United States • Supply Chain AI • RegTech, AML & Compliance • Supply Chain & Logistics Software • 501-1000 employees • Est. 2013 • Trust A • Hiring 52, 4 new
Exiger is a supply chain risk management and procurement software company based in McLean, Virginia, whose AI platform 1Exiger gives corporations, banks and government agencies visibility into suppliers, parts, compliance and third-party risk. Founded in 2013, it has more than 850 employees in 10 offices, reports over 550 customers including 150 Fortune 500 companies and more than 80 government and defense organizations, and is FedRAMP authorized. Openings include software, platform, database and site reliability engineers, investigative and supply chain risk analysts, multilingual research associates, customer success managers and federal account executives.
idme.com • HQ: McLean, United States • Identity Management • 501-1000 employees • Est. 2010 • Trust A • Hiring 38
HQ: McLean, United States • Identity Management • 501-1000 employees • Est. 2010 • Trust A • Hiring 38
ID.me is a digital identity company headquartered in McLean, Virginia, whose identity wallet lets people verify who they are once and then sign in across government, healthcare and commercial websites. More than 152 million members use it at 20 federal agencies, 45 state agencies, over 70 healthcare organizations and more than 600 consumer brands, and it is certified as a NIST 800-63 IAL2 and AAL2 credential service provider, with further offices in Mountain View, New York and Tampa. It hires staff and principal software engineers, quality and data platform engineers, account executives and managers, revenue operations and legal staff.
