Updated 14 October 2026.
Computer Services New Jersey (CSNJ) is an IT company in Holmdel, Monmouth County, supporting construction companies across New Jersey and New York City. We connect jobsite trailers and temporary sites, give field crews secure access to drawings and files, and help protect you from fake supplier and subcontractor invoices. Support requests are answered in 30 minutes or less.
Jobsite trailers and temporary sites
A jobsite trailer needs internet before there is a building to wire. The options are LTE or 5G, a satellite link such as Starlink, or a temporary network that is planned so it can move from site to site without being rebuilt. The right one depends on the location and the number of people, and we set it up, test it and keep it working.
From the field to the office
Superintendents and foremen work from tablets and phones, and they need drawings, RFIs and photos in minutes, not at the end of the day. We set up the devices, the access to project files and the mobile device management that lets you wipe a lost tablet without losing the job.
Construction software
Construction runs on project and accounting software alongside the drawings. We support Sage 300 CRE, including its updates, access and the connections between office, field and accounting.
Fake invoices and payment fraud
Contractors pay many subcontractors and suppliers, and each payment is a chance for a fake invoice or a changed bank account. The defense is a routine: any change to payment details is confirmed by calling a number you already hold. We set up email protection that blocks look-alike senders and help you write the routine down. Cyber-insurance applications also ask about controls such as multi-factor sign-in, and we help you answer them accurately.
Jobsite cameras
Cameras at the trailer and the site entrance protect equipment and record deliveries. See our CCTV installation service.
Where this fits with our other services
This page covers what is different for construction companies. For the services behind it, see our managed IT services, cybersecurity services and remote IT support.
Proof
CSNJ supports a well-known construction company in Freehold, NJ.
Find out where your company stands, in one visit
Book a free IT assessment: your office network, field access, devices and payment controls, checked against how your jobs actually run.
Frequently asked questions
How do we get reliable internet in a jobsite trailer?
Usually with LTE or 5G, or a satellite link such as Starlink, on a temporary network that can move from site to site. We choose the option for the location and set it up and test it.
Can our field teams access drawings securely?
Yes. We set up tablets and phones with protected access to your project files and mobile device management, so a lost device can be locked or wiped.
Do you support Sage 300 CRE?
Yes. We support Sage 300 CRE, including its updates, access and the connections between the office, the field and accounting.
How do we protect against fake supplier invoices?
By confirming any change to payment details with a call to a number you already hold, and by email protection that blocks look-alike senders. We help you set up and write down both.
What if the network at the office goes down?
Call or use our Get Help page at any hour. We answer support requests in 30 minutes or less, with technical staff on call 24/7/365.
Related: Industries We Serve | IT support for architecture and engineering firms
