Cornerstone Defense LLC is a Small Business servicing the Intelligence, Defense, and Space communities of the U.S. Government. Cornerstone Defense specializes in cloud architecture, enterprise engineering, systems and network engineering, systems and network security, and application and software development. We use these foundational technology areas to deliver solutions for data analytics, cyber, and space/mission operations, customized to meet mission requirements. We are headquartered in Herndon, VA, with employees working across the U.S including DC, MD, CO, UT, NM, HI, and CA. At Cornerstone Defense, you’ll find a partner that values strong relationships, excellence, and teamwork. Our team is a network of professionals who are dedicated to providing agile, secure, and efficient solutions to support mission success. With Cornerstone Defense, you’re not just choosing a service provider, but a committed, steadfast team with a culture designed to excel.
To find out more information on where we can help you, services we provide,
joining or partnering with our team, please select one of the links below!
We bring together a unique blend of cutting-edge capabilities, specialized expertise, and a remarkable company culture that focuses on the recruitment and retention of highly-sought-after employees.
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We work hard, but we know how to celebrate our mission! 🥂✨ So grateful for this incredible crew at our recent team dinner. We are expanding our amazing team and looking for a new rockstar to join us!
Are you a cyber mastermind with an active TS/SCI w/ Poly? If you want to tackle the nation’s toughest security challenges with Cornerstone Defense, we need to talk! 🚀🛡️
🕵️♂️ The Role: Lead Cyber Systems Engineer | Linthicum Heights, MD
💸 The Pay: $230K - $250K
Here’s what you’ll be doing:
• 🛡️ Defensive Magic: Use an offensive cyber mindset to assess DOD systems, hunt vulnerabilities, and secure architectures.
• 🤝 Lead & Inspire: Mentor and lead senior systems engineers, helping them crush their goals!
• 🏗️ Architect the Future: Build zero-trust frameworks, evaluate contractor proposals, and shape acquisition documents.
• 🌟 Mission Champion: Build strong relationships with our customers to drive mission success.
What you need to bring to the table:
• 📜 The Badge: Active TS/SCI w/ Polygraph (Required)
• 🧠 The Brains: Relevant STEM BS/MS + 15 years of systems engineering experience (including 6 years in a lead role).
• 🔒 The Skills: Zero Trust experience (INCOSE and NIST knowledge are huge pluses)!
In return, you get an epic benefits package including generous PTO, top-tier medical/dental/vision, 401(k), tuition reimbursement, and so much more! 🌟
Ready to take your career to the next level with an Employer of Choice? Send me a message, or apply directly through Cornerstone Defense Careers to join our growing family! 📥👇
✨ Posting a little early while we’re all still in the office — but we couldn’t resist sharing this shot with the stars & stripes proudly behind us! Happy almost 4th of July and America’s 250th birthday! Grateful every day for the work we do supporting U.S. government missions, and especially for our Cornerstone teammates who are veterans and active‑duty service members.
Big flag, big smiles, big purpose. ❤️🤍💙
How are you celebrating the holiday this year? Drop your plans below! 🎆👇
Proof that margaritas and teamwork actually do mix! 🍹🙌 Loved spending time with everyone at our Uncle Julio’s happy hour in Reston last week!
If you want to get to know Cornerstone — and maybe snag an invite to a future Cornerstone happy hour — drop us a comment!
If you’re already part of the team, tell us where you’d like to see the next happy hour happen! 👇🍻 Thanks to all who came out last week. 🙂
🎉 FUN FACT FRIDAY: BEHIND THE SCENES! 🎉
Did you know that every new Cornerstone Defense employee gets their very own swag bag on Day 1? 👀🎒
From our signature Cornerstone backpack, to sweat towels 🏋️♂️, compactable cups ☕, notepads ✍️, sticky notes 📌, polos 👕, and more — our swag lineup rotates throughout the year to keep things fresh, fun, and useful!
Today’s behind‑the‑scenes snap shows where all that magic lives… our very own swag HQ 🤩📦✨
But now we want to hear from YOU👇
💬 What’s your all‑time favorite Cornerstone swag item you’ve received — either from your welcome bag or anywhere along the way?
Was it something practical? Something stylish? Something you still use every day?
Drop your favorites in the comments! ⤵️
Let’s boost some team energy, employee engagement, and #CornerstoneCulture vibes today! 🚀💙
#FunFactFriday #EmployeeExperience #CompanyCulture #TeamCornerstone
Follow up from yesterday: here’s what our team has been focused on lately — literally.!✨ Our word‑cloud board is packed with themes like accountability, optimism, transparency, honesty, organization, prioritization, persistence, and authenticity — a pretty powerful snapshot of where we’re hat halfway through 2026. 💬🔥
Now we want to hear from you:
Which word stands out the most?
What word would you add to the board?
Drop your word in the comments — we love seeing what’s resonating with other teams and leaders. 👇🏻💡
