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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🧊 Ice, Ice, Baby... 🎶 When the heat index hits triple digits and the sidewalk feels like lava, there’s only one move: ICE CREAM. 🍦🔥
Big thanks to our building managers for treating us to a frozen moment of bliss with scoops from Paradise Ice Cream — talk about a sweet way to beat the heat! ☀️❄️
If you’re looking for a workplace that knows how to stay cool (literally and culturally), we’re hiring! Come for the mission, stay for the popsicles. 😎👇(Link to our website in Comments!)
Matching polos, in-office hangs, and a special visit from our CFO, Brian Sammons !👕💼The Accounting team was repping Cornerstone blue today and making the most of some real face time!
We believe in the power of in-person connection—collaborating, problem-solving, and having a little fun while we’re at it. 🎉🎈😁
It’s not just about crunching numbers — it’s about showing up for each other and building a great community and culture, too. 👏 Want to learn more about what it’s like working for us? Check out our Culture page on our website today (link in comments!)
Today, we honor Juneteenth—commemorating the end of slavery in the United States and recognizing the importance of freedom, justice, and equity for all.
At Cornerstone Defense, we believe our strength lies in our people. We’re proud to foster a culture that values inclusion, dignity, and respect—today and every day.
Let’s continue learning from the past and shaping a stronger, more united future—together.
🚨 INTERN SPOTLIGHT ALERT 🚨
Meet Nico — one of our summer interns! Nico’s a rising senior at Virginia Tech, majoring in Business, and he’s already bringing the energy, curiosity, and snack suggestions (hello, hummus & crackers 🧆) we didn’t know we needed.
👀 Want to know:
✨ What skill he wishes he could master instantly?
📺 Which fictional character he’d swap lives with for a day?
💼 What he’s most excited to learn at Cornerstone?
➡️ Swipe through to see all of Nico’s answers!
Let’s give a big Hokie welcome to one of the coolest interns around!
⚠️ This is your sign. (Literally.)
We’re hiring. You’re cleared. Coincidence?
📸 Screenshot this and send it to a friend who’s ready to bounce. You might just change their life!
If you, or someone you know, has a TS/SCI with poly and are feeling underwhelmed, overlooked, or just plain over it… this might be the moment the universe (or at least Cornerstone Defense) sends you a nudge!
We’re hiring cleared professionals who are ready to do meaningful work and be treated like real people—not just a labor category. At Cornerstone, culture isn’t an afterthought. It’s the reason people stay.
✅ We answer your emails.
✅ We invest in your growth.
✅ We show up for each other—and have a little fun while we’re at it.
Learn more about Cornerstone on our website today (link in comments!)
