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 with AI every day — but we’re also real people who value authenticity, clarity, and the meaningful use of technology. 🤝✨
We all know that there’s been an explosion of AI content across social platforms, and not all of it feels helpful, human, or aligned with what audiences actually want. So we put together a quick carousel to highlight some of the AI trends people are getting tired of seeing — and to spark a real conversation about what good AI practice looks like. 🤖💬
What AI habits, tactics, or “trends” drive you nuts? Drop your biggest AI pet peeves in the comments — we’re genuinely curious and always looking to learn — we want to do things right and “keep it real!” ⬇️👀
Cornerstone sighting! 👀🌍 But where!?
Drop your guesses below on where you think this action‑packed Cornerstone adventure took place! ✈️📸💥
And hey — if you have photos from places you’ve traveled, hiked, camped, road‑tripped, or adventured while repping your Cornerstone gear, send them our way! We LOVE seeing where our swag ends up around the world. 🌎💛
Don’t have a Cornerstone pic but have ideas for future swag?
Tell us what kind of merch you’d love to see our brand name on — hats, stickers, hydroflasks, beach towels, dog bandanas… get creative! 😎🔥
Let’s see those guesses and gear ideas below! 👇✨
We need a lot of things. 😂😂 But right now, we mostly need a Senior Information Systems Security Engineer! Job description below — browse through and see if this could be a job for you! 🚀🔐
Senior Information Systems Security Engineer
📍 Reston, VA
🔒 TS/SCI with Polygraph Required
We are seeking a highly skilled, hands-on Senior Information Systems Security Engineer (ISSE) to secure mission‑critical systems across hybrid, cloud, and air‑gapped environments. The ideal candidate brings deep technical expertise in RMF, STIG compliance, vulnerability scanning, continuous monitoring, and secure system engineering—someone who is actively involved in building and configuring secure solutions rather than simply reviewing them. In this role, you will design, engineer, assess, and sustain security controls across complex system architectures, ensuring compliance, operational readiness, and mission resilience. 💼✨ View our website for more info!
Intern Update! 🚀
Yesterday we hosted an all‑in‑one deep dive into HR, Security, and Marketing for our amazing interns — and what a day it was! 💼🔐📣
At Cornerstone Defense, it’s important to us that our interns gain real-life skills and a genuine understanding of how the inner workings of a company come together. Not just so they can shine during their internship 🌟 — but so they walk away with knowledge that helps shape where their career paths go next. 🧭✨
We had great conversations, lots of learning moments, and plenty of laughs along the way. Nothing makes us happier than watching our interns grow, ask big questions, and build confidence in the fields they’re exploring. 🙌💡
Here’s to investing in our future leaders — one session at a time! 💙👩💻👨💻
✨ Another amazing day partnering with Boulder Crest! 🌿💪
Our team spent yesterday mulching (and mulching… and mulching!) to help get the property ready for their big Red, White & Bluegrass celebration happening this weekend! 🎶🌭🥤
Supporting Boulder Crest Foundation’s mission to serve combat veterans, first responders, and their families is always an honor — and pitching in to help prep for such a meaningful community event made the day even sweeter. 💙
📅 Red, White & Bluegrass – June 13
Think live bluegrass, great food, cold drinks, local vendors, line dancing, a bourbon tasting, and an incredible raffle with prizes like Morgan Wallen field tickets, a signed Justin Moore guitar, a PS5, and more. It’s a full day of summer fun, and every ticket supports Boulder Crest’s life‑changing programs.
📸 Swipe through to see our crew in action — a lot of sweat, even more smiles, and mountains of mulch!
➡️ And if you need an enthusiastic volunteer team for your next project, we’re always ready to roll up our sleeves!
