Cybersecurity & IT Services in Greenwich, Connecticut
Greenwich concentrates more investment capital per square mile than almost anywhere in America, and the businesses here are judged on how they handle other people's money and other people's data. NetSys delivers cybersecurity, managed IT, and vCISO leadership to Greenwich firms with Connecticut as a named on-site coverage area — and a financial practice we have never once named a client from.
The short answer
NetSys provides cybersecurity and managed IT services to businesses in Greenwich, Connecticut: multifactor authentication and conditional access, managed endpoint detection and response, email defense tuned for the lookalike-domain and reply-chain attacks that target wealth managers, 24/7 monitoring, immutable backups with restores that get run rather than reported, penetration testing, and vCISO leadership for firms answering to investors, insurers, or regulators. Connecticut is one of our named on-site coverage areas, so an engineer comes to your office for work that needs hands — including the free on-site penetration test. Our financial-services clients are hedge funds and CPA firms served under strict confidentiality; we never name them, on this page or anywhere else. Our only office is in Brooklyn, NY, and we do not claim a Greenwich address. There is a multi-location client with an Old Greenwich location on our books today.
- Connecticut is a named NetSys on-site coverage area
- Current client footprint includes an Old Greenwich, CT location
- Financial clients — hedge funds and CPA firms — are never named publicly
- vCISO leadership for firms facing investor, insurer, or regulator scrutiny
- Headquarters: 1 Prospect Park SW, Suite 6E, Brooklyn, NY 11215 — no Greenwich office claimed
Security that survives someone else's diligence questionnaire
In most towns, a security programme has to satisfy the owner. In Greenwich it has to satisfy an allocator, an auditor, a prime broker, or an institutional client who sends a questionnaire and expects the answers to be true and evidenced. That changes the work: controls have to be documented as well as deployed, access reviews have to leave a trail, and 'we have backups' has to mean a restore someone actually ran on a date you can name. We build to that standard because our financial practice already answers those questionnaires.
Discretion is part of the service
We serve hedge funds and CPA firms and have never published one of their names, logos, or locations — not in a case study, not in a testimonial, not as a passing reference. If you would be uncomfortable seeing your firm mentioned in your IT provider's marketing, you will not be. References can be arranged privately with a client's consent, which is a different thing entirely from a public brag.
Who this fits in Greenwich
Wealth and investment managers, family offices, CPA and tax practices, law firms serving the same clients, and the private companies whose principals live here and expect their business to be run to the same standard. If you need a security executive's judgement but cannot justify a security executive's salary, the vCISO programme is built precisely for that gap.
A 25-person wealth manager off Greenwich Avenue
A composite example of work we do, written so you can picture the first 90 days. It is not a specific client — our real, named engagements are in case studies.
Assets under management have grown past the point where the firm's IT arrangements were designed. An institutional allocator has just sent a 40-page diligence questionnaire, and the operations partner cannot answer section 6 — access controls, incident response, vendor risk — without guessing. Two principals travel constantly and log in from hotel networks. The Microsoft 365 tenant still has an inbox belonging to someone who left in 2023.
- A security assessment mapped to the questions the firm is actually being asked, producing a prioritized fix list rather than a scanner dump
- Identity first: multifactor authentication everywhere, Conditional Access policies for travel and unmanaged devices, legacy authentication disabled, dormant accounts closed
- Managed endpoint detection and response on every laptop, with 24/7 monitoring behind it so an alert at 2am reaches a human
- Email defense tuned for the specific threat to this firm — lookalike domains and reply-chain hijacking aimed at wire instructions
- Immutable backups for the tenant and the file estate, then a documented restore actually performed and dated
- Policies, incident response plan, and vendor risk register written so section 6 can be answered truthfully and evidenced
The questionnaire gets answered from documentation rather than memory, and stays answerable at the next renewal. Ongoing, the firm runs on managed IT with a named account manager, and a vCISO engagement gives the partners someone to sit with the allocator or the insurer when the questions get harder. Month to month, like every NetSys agreement.
Services in Greenwich, CT
Industry depth: IT for Law Firms · IT for Financial Firms · IT for Accounting Firms
Greenwich, CT FAQs
Do you have an office in Greenwich, CT?
No, and we will not pretend otherwise — our one office is at 1 Prospect Park SW, Suite 6E, Brooklyn, NY 11215. Connecticut is one of our named on-site coverage areas, which means engineers travel to Greenwich for the work that needs hands: the free on-site penetration test, firewall and network changes, office build-outs and moves, and the discovery session that opens a managed relationship. There is a multi-location client with an Old Greenwich location on our books today. Plenty of IT firms list a Greenwich address that is really a mail drop; we would rather tell you how coverage actually works.
What cybersecurity services do Greenwich firms typically need?
Layered defense, built to be evidenced rather than merely installed: multifactor authentication and Conditional Access, managed endpoint detection and response, email protection tuned for lookalike domains and reply-chain hijacking, DNS filtering, 24/7 log monitoring with real-time alerting, immutable offline backups with tested restores, and staff awareness training. Above that sit penetration testing, cyber-insurance readiness, and vCISO leadership. The distinguishing pressure in Greenwich is that someone else — an allocator, an auditor, an insurer — will ask for proof, so we document as we deploy.
Will you name my firm in your marketing?
No. Our financial-services clients — hedge funds and CPA firms — have never been named on this site, in a case study, or in a testimonial, and that is deliberate policy rather than an oversight. If you want to speak to an existing client before hiring us, we will ask that client's permission and arrange it privately.
Do you work with family offices?
Yes, and they tend to be the clearest fit for the vCISO model. A family office carries institutional-grade risk — wire fraud, impersonation of principals, concentrated personal data — on a headcount that cannot justify a full-time security executive. The vCISO engagement supplies the strategy, policy, vendor-risk and board-reporting layer, while managed IT and the security stack underneath handle day-to-day operations.
What is the free on-site penetration test?
A NetSys engineer comes to your office and safely demonstrates how an attacker would actually get into your business — not a report generated by a scanner, but a walkthrough of the realistic path in. You keep the prioritized findings whether or not you hire us. In Greenwich it is usually the fastest way for a firm to find out whether its current arrangements would survive contact with a competent attacker.
Can you support principals who travel constantly?
That is the normal shape of the work here. Devices are managed wherever they are, remote access is hardened rather than merely available, and Conditional Access policies decide what an unmanaged device or an unfamiliar country is allowed to reach. The security stack follows the person rather than the office, and the office is secured on its own terms.
Start with fifteen minutes — or a free on-site pen test.
Talk to a NetSys engineer about your environment, or book the free on-site penetration test and watch us find what an attacker would.