Cybersecurity Services in Brooklyn, NY
The NetSys Group has run its cybersecurity practice from Brooklyn since 1998, and the office at 1 Prospect Park SW in Park Slope is the only one we have. For a Brooklyn business that means the engineer who takes your call can be at your door, and monitoring never stops. We watch every device around the clock, put multifactor authentication and Conditional Access in front of your accounts, filter phishing before it reaches staff, train the people who click, and keep immutable backups that a ransomware crew cannot touch.
The short answer
NetSys provides cybersecurity services to Brooklyn businesses from its headquarters in Park Slope, the company's only office. The stack is the same one we run for every client: 24/7 monitoring with an engineer acting on alerts, managed detection and response on every workstation and server, multifactor authentication and Conditional Access on Microsoft 365, email and phishing protection, security awareness training, privileged access and privileged identity management, and immutable backups with restores we test. The engagement opens with a free Tier 1 external penetration test covering your website, public systems, public-record exposure and phishing likelihood. On-site work anywhere in the borough is the shortest trip we make for anyone. Agreements run month to month, and your account manager answers a real cell phone.
Cybersecurity risk in Brooklyn's business mix
Brooklyn runs on medical and dental offices, professional practices, creative and production companies, food and goods businesses moving physical inventory, and importers working around the ports. Most of them share two traits: thin or absent internal IT, and data or money worth stealing. A production company keeps client footage on a NAS that freelancers reach over a shared Wi-Fi password. A food distributor pays suppliers from an inbox that has never seen multifactor authentication. A dental group stores patient records under HIPAA on workstations protected by consumer antivirus. Attackers work those seams with invoice fraud, payroll diversion and ransomware that spreads across a flat network in a converted industrial building. The SHIELD Act, HIPAA and PCI DSS add regulatory weight, and insurers add their own conditions at renewal.
How cybersecurity is delivered from Park Slope
Detection and response run remotely and never sleep: endpoint agents, identity logs, email flow and network telemetry feed a monitoring stack our engineers watch around the clock. What makes Brooklyn different is proximity. When a machine needs to be pulled off the network, a firewall swapped, or a security walkthrough done before a lease is signed, the engineer is coming from Prospect Park rather than from another state, and there is no travel premium for it. Every engagement begins with the free external penetration test, then a review of identity, email, endpoints, network and backups as they stand. From that we write a prioritized fix list and a plain statement of what we take over. Terms are month to month from the first day.
Who this fits in Brooklyn
Businesses that have outgrown a local computer shop or a break-fix arrangement and want a security team without hiring one: medical and dental practices with patient data, law and accounting firms, design studios and production companies with freelancers on personal laptops, food businesses and importers with supplier payments to protect, and nonprofits with donor records. A company that already employs an IT person fits as a co-managed arrangement, where we take the monitoring, the security stack and the after-hours calls. If you are opening a second location in the borough, the identity and network design should be done once, before the move, rather than repaired afterwards.
Cybersecurity in Brooklyn, NY: what NetSys delivers
Monitoring and response
- 24/7 monitoring across endpoints, Microsoft 365 identities, email and the office network
- Managed detection and response replacing consumer antivirus on every device
- Immediate isolation of an infected machine, followed by investigation and cleanup
- Incident timeline and root-cause report for leadership and your insurer
- A dedicated account manager reachable on a real cell number during an incident
Accounts and privileges
- Multifactor authentication and Conditional Access enforced across the tenant
- Shared logins replaced with individual accounts so access is attributable to a person
- Privileged access management for the accounts that can change everything
- Privileged identity management with time-limited admin rights
Email and staff
- Phishing and malware filtering ahead of every mailbox
- Email authentication records set so your domain cannot be impersonated
- Security awareness training built around the lures Brooklyn businesses see: fake invoices, payroll changes, delivery notices
- DNS filtering on office, warehouse and remote devices
Backups and testing
- Immutable backups for servers, workstations and Microsoft 365
- Scheduled restore tests with the results documented
- Free Tier 1 external penetration test at the start of the engagement
- Tier 2 source code penetration testing for businesses that ship software, quoted per codebase
A production company in a converted Brooklyn warehouse
A composite example of work we do in Brooklyn, NY, written so you can picture the first 90 days. It is not a specific client. Our real, anonymized engagements are in case studies.
Forty people on payroll and twice that many freelancers across a year, all working off a shared Wi-Fi password and a file server full of client footage. Freelancers bring personal laptops. The owner found out a competitor had paid a ransom and started asking questions. Payroll is handled by a bookkeeper who recently received a convincing request to change an employee's direct deposit account.
- Free external penetration test to see what the company exposes: the website, remote access ports left open for editors, and the staff names and roles an attacker would use for a payroll-change lure
- Wi-Fi rebuilt with individual authentication for staff and a separate guest and freelancer network that cannot reach the file server
- Managed detection and response on every company device, with a conditional-access rule that keeps unmanaged personal laptops out of the tenant
- Phishing protection and a payroll-change verification procedure the bookkeeper follows every time, plus awareness training for the whole crew
- Immutable backups of the footage archive and Microsoft 365, with a restore of a project folder tested and timed
Freelancers still get their work done, but from a network that cannot reach the archive, and a fake payroll request now dies at a phone call. The owner can see what is protected in plain language, and the engineer who set it up works a short trip away. The agreement runs month to month.
Related pages
Read the full Cyber Security service page. See everything NetSys delivers in Brooklyn, NY.
Also in Brooklyn, NY: Network Security & Monitoring · Backup & Disaster Recovery
Cybersecurity elsewhere: New York City · Nassau County, NY · Suffolk County, NY · Westchester County, NY · Stamford, CT
Related services: Managed IT Services · Penetration Testing · Microsoft 365 Management & Backup · Security Assessments
Cybersecurity in Brooklyn, NY: FAQs
Who provides cybersecurity services in Brooklyn?
The NetSys Group, headquartered at 1 Prospect Park SW in Park Slope, provides managed cybersecurity to businesses across Brooklyn. The service includes 24/7 monitoring, managed detection and response on every device, multifactor authentication with Conditional Access, phishing protection, security awareness training, privileged access management and immutable backups with tested restores. It opens with a free external penetration test, and the agreement is month to month. Brooklyn is our home borough, so on-site work here is the shortest trip we make.
Is there a cybersecurity company based in Brooklyn?
Yes. NetSys has been headquartered in Brooklyn since 1998, and the Park Slope office is the company's only location. That matters for two reasons. Engineers who work on your systems remotely are the same people who come to your office, and there is no travel surcharge for a borough we live and work in. Other providers will drive to Brooklyn; we start here.
How quickly can an engineer get to my Brooklyn office during an incident?
Remote response starts the moment an alert fires, because isolating a compromised machine does not require anyone to travel. When hands are needed, the trip from Prospect Park to most of the borough is short, though we will not promise a number of minutes that traffic could make a lie. What we will say is that on-site work in Brooklyn is routine for us and carries no premium.
What does cybersecurity for a Brooklyn medical or dental practice include?
Attributable access to patient records, which means individual accounts with multifactor authentication instead of a shared front-desk login. Managed detection and response on every workstation that touches the practice-management system. Phishing protection and staff training, since most practice breaches begin with an email. Encrypted, immutable backups with restores tested against a real recovery-time target, and documentation of all of it in a form that supports your HIPAA risk analysis and your insurer's questions.
Can you secure freelancers and personal devices that connect to our network?
Yes, and it usually comes down to two controls. Conditional Access policies decide what an unmanaged device can reach in Microsoft 365, so a personal laptop can join a Teams call without opening the whole tenant. Network segmentation gives freelancers and guests their own Wi-Fi that cannot see the file server or the office workstations. Where a freelancer needs deeper access, we issue a managed device or a controlled remote session rather than a password.
Do we need cybersecurity services if we already have antivirus and a firewall?
Antivirus and a firewall are two layers out of the six or seven that stop modern attacks, and neither of them helps when someone hands over a password on a phishing page. Managed cybersecurity adds the pieces that catch what those miss: identity controls, continuous monitoring with a person responding, phishing filtering, staff training and an immutable backup for the day something gets through. The free external test will tell you which gaps matter most for your business.
See what an attacker sees before they do.
The free external penetration test covers your website, public systems, public-record exposure and phishing likelihood, with a fix list you keep either way.