Our team of experts provides Security Solutions including Managed Next-Gen Firewall Services, Managed Vulnerability Management, Managed Email and End User Security, Data Loss Prevention and more.


Large Ideas Helping Local Businesses Gain peAce of Mind

South Bend, Indiana-based QuantaSi is a managed security services provider helping businesses secure their data and proactively anticipate curveballs, all while protecting clients’ online presence and granting peace of mind.

Founded in 2016 by Nick Hahaj, with James Doty joining shortly after, QuantaSi specializes in Infrastructure, Hybrid Cloud, IT Support, and offers a comprehensive suite of Security Services to businesses of all sizes.

What began as a sole proprietorship serving two clients has grown into a multi-employee, local company with large ideas helping local people.

Our South Bend, Indiana, headquarters offers 24/7/365 system monitoring and speedy response times, ensuring personal, one-on-one communication with one of our technicians.

QuantaSi now counts more than 30 regional clients, including several nonprofits. Our goal: help businesses stay one step ahead of the ever-changing landscape of cyber threats, improve IT efficiency and plan for a path forward.

The best offense begins with QuantaSi in your corner.

What Our Clients Say

"QSI has been a great partner to our organization; very responsive in critical situations, takes the time to explain things in detail, and looks ahead and alerts us to potential down stream issues on projects and offers potential solutions for us to consider beforehand. Additionally, the team is personable and easy to work with."

-David S., Global Access Point

"QuantaSi has been a fantastic partner in working with our company (Steel Warehouse) in a very complex domain migration projects. Their staff was extremely knowledgeable and responsive and were able to pivot when we hit roadblocks along the way. Highly recommend!"

-Eliezer W., Steel Warehouse

"QuantaSi helped us through the complex design and implementation of our digital computing infrastructure. Their knowledge has helped scale our company while implementing the best cybersecurity principles. They are world-class experts and build technology to last."

-Nate M., CEO, Consensus Networks

"We recently worked with QuantaSi to perform an in-depth network audit/review and the results far exceeded expectations. The information they provided was highly detailed and will be very beneficial to us moving forward. Working with QuantaSi was a pleasurable experience, and I look forward to working with the team in the future."

-Ian H., Chase Plastics

"I recently opened an Accounting Firm and the guys did amazing making sure I was set up timely and efficiently. Highly recommend!"

-Angela R., Star Accounting

"Back in 2021, we upgraded to fiber throughout the fairgrounds. At the time, we had a alternate company doing our IT maintenance and upkeep. A company named EnFocus helped us get everything set up and partnered us with QuantaSi to manage the health and maintenance of the devices. I was very impressed with their professionalism, knowledge and sense of urgency when we had a problem. Over the next two years they helped us troubleshoot problems and worked out all of the kinks of our new network. In May of 2022, our contract with the other company was up. I spoke to Nick Hahaj from QuantaSi about taking over all of our IT needs. They have done an amazing job helping us upgrade obsolete equipment to make our network more efficient. I would recommend QuantaSi to anyone in need of their services. "

-Jeremy B., St Joe County Fair

"I own and operate a boutique HR Consulting firm. I need an MSP to help with all aspects of my IT and Cyber Security. As you can imagine - in HR we have access to a lot of data that needs to be protected to the highest level. We have been with them for about 6 weeks now and I cannot recommend them enough. They have made the transition from my previous MSP so seamless! Any questions or issues are resolved very fast. I knew I had a knowledge gap around Cyber Security and Nick has gone above and beyond to teach me and support me with building the necessary policies so we are mitigating as much risk as possible. This part of my business has kept me up at night over the last year. I am so thankful I found QSI. They seem to have all the bases covered and I feel so much more at ease that we are doing all we can to protect ourselves and our client's data. If you own a business and feel that IT and/or cybersecurity is a concern - you should call Nick and his team right away. They offer a great service and even better support!"

-Emiley P, HR Consulting Firm

"QuantaSi has been an extremely effective partner in supporting technology requirements across a broad spectrum of both nonprofit and for-profit organizations. I highly recommend their services and support."

-Mike B.



Meet Our Leaders

Nick Hahaj

A lifelong local resident, Nick began his IT career in 2001 on the service desk, and through hard work, training and dedication, progressed his way to managing teams of experienced system and network engineers. He has held numerous technical and managerial positions in a wide range of industries. He has designed, implemented and supported industry-standard technologies including those from Cisco, VMWare, Microsoft and EMC as well as implemented innovative solutions using commodity hardware. Nick has expertise in designing complex IT solutions, Project Management and Capacity/Business Continuity Planning. In addition to his hands-on experience and training, he holds or has held several Industry recognized certifications, including those from Cisco, CompTIA, Microsoft and ITIL.

Nick’s time in front of a screen is eschewed for sunlight, woods and trails, whenever possible. He’s an avid lover of outdoor activities with a refreshing disconnect, especially power sports such as dirt bikes and four-wheelers.

James Doty

James has been a resident of the Michiana area his entire life. He began his IT career in 2000 as a district technician and moved on to roles as a sys admin, voice engineer and ultimately an MSP engineer. He has held technical positions in several different organizations including school systems, local government and the private sector. He has deployed virtual environments, Cisco VoIP systems, Meraki and Cisco networks, as well as entire environments from the ground up. James has worked several projects simultaneously, from start to
finish, and met deadlines with proficiency and accuracy.

When James is not in front of a keyboard, he spends his time disconnecting from all electronic devices when possible. His cellphone would not be in ear shot. He enjoys being outside and would love to be close to or on a body of water somewhere with a lot of sunshine. He loves football, and you will find him spending maybe too much time during the fall months watching Michigan football and the Chicago Bears on Saturdays and Sundays. He enjoys spending his downtime with his family and friends and would be content sitting around a fire with good conversation, good music and something to throw on the grill.

Sean Gleason

Sean, a proud resident of Niles, MI, brings a wealth of knowledge and enthusiasm to our team as the newest Service Desk Technician. Graduating with an associates degree in Information Technology Networking in 2014, Sean has seamlessly integrated into our work family, proving himself to be a valuable and dedicated member.  With a solid educational background, Sean embarked on his professional journey in the field of Information Technology. His expertise and quick adaptability have been instrumental in his role as a Service Desk Technician, where he resolves technical issues and ensures the smooth functioning of our IT infrastructure.

Outside the world of technology, Sean finds joy in the simple pleasures of life. An avid dog lover, he enjoys walking his German Shepherds and spending quality time playing with them. His compassion extends beyond the digital realm to the furry friends who make his days brighter.  A lifelong resident of Niles, Sean has a deep appreciation for the outdoors. Whether it’s hunting, fishing, or engaging in other outdoor activities, he embraces the beauty of nature. His adventurous spirit and love for the great outdoors contribute to a well-rounded personality.

Since joining our team, Sean has quickly become an integral part of our workforce. His dedication, coupled with his technical acumen, has made a positive impact on our daily operations. As we navigate the ever-evolving landscape of technology, Sean stands as a reliable and innovative force within our team.  We are fortunate to have Sean Gleason on board, bringing his skills, passion, and positive energy to the forefront of our collective success.

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