Managed IT & Cybersecurity in Harrison & Purchase
Purchase's campuses put Fortune-scale headquarters on Westchester lawns, and around them grew an economy of firms that serve, supply, and advise at that altitude — investment offices, professional practices, and businesses whose clients expect headquarters-grade discipline. NetSys serves clients across Westchester County today and builds for exactly that expectation.
The short answer
NetSys provides managed IT, cybersecurity, and AI automation to Harrison and Purchase businesses: 24/7 monitoring and support, identity-first security with MFA and conditional access, managed endpoint detection and response, email defense against executive impersonation and payment fraud, Microsoft 365 and Azure management with independent backup, immutable disaster recovery, penetration testing, vCISO leadership, and AI automation from our in-house practice. Westchester County is a named on-site coverage area with existing NetSys clients. Headquarters: Brooklyn — no Harrison office claimed, and the work doesn't require one.
- Westchester County on-site coverage with existing NetSys clients
- Campus-orbit standard: vendor-grade security reviews are expected here
- Executive-impersonation defense tuned for headquarters towns
- Month-to-month agreements only
- Brooklyn HQ — no Harrison office claimed
Passing the vendor security review is table stakes here
Firms in a headquarters orbit get asked for security attestations as a condition of doing business — questionnaires written by enterprise security teams, aimed at twenty-person vendors. We build environments that answer them honestly: documented controls, monitored endpoints, access reviews with dates, incident plans with owners. It's the difference between winning the engagement and explaining yourself out of it.
The executive-impersonation problem, concentrated
Towns full of senior executives produce a specific attack: the fake CEO email, the urgent wire, the assistant under pressure. Countermeasures are procedural and technical at once — email authentication and lookalike-domain defense, payment verification steps that no email can waive, and conditional access that notices when a login doesn't fit the person. We implement both halves, because either alone fails.
Automation with governance attached
Our AI practice automates the repetitive layer — intake, scheduling, follow-up, after-hours phones — with the governance this town's firms are held to: least-privilege access, explicit guardrails, and a record of what runs where. Secure AI adoption is a named NetSys service; automation that can't pass a client's security review isn't a productivity gain, it's a finding.
The last server finally leaves the building
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.
An engineering firm in Harrison kept a file server and an application server in a closet that doubled as storage for trade-show banners. Drawings lived on the server, everything else had drifted into personal OneDrive accounts, and the air conditioner in that closet was the most important machine in the company.
- Both servers migrated to Azure, sized for what the firm uses rather than what the closet held
- Project files moved out of personal OneDrive accounts into SharePoint libraries with permissions that match the org chart
- The application vendor requirements handled during the move, not discovered after it
- Backups running in Azure with a restore tested against a real project folder
- The closet hardware decommissioned, wiped and recycled with a certificate to file
Uptime no longer depends on a window air conditioner. A new hire finds project files by browsing, not by asking who has them.
Services in Harrison & Purchase, NY
Industry depth: IT for Law Firms · IT for Financial Firms · IT for Accounting Firms
Nearby: Westchester County · White Plains, NY · Rye, NY · Greenwich, CT
Harrison & Purchase, NY FAQs
Our enterprise client sent a 60-question security questionnaire. Can you help?
Yes — this is a core scenario for our security assessment and vCISO work: map the questionnaire to your actual environment, close the gaps that matter, and build the evidence file so answers are true and provable. Firms usually find the same work satisfies their insurance carrier and their next enterprise client too.
Do you cover Harrison and Purchase with on-site engineers?
Yes — Westchester County is one of our named on-site coverage areas with existing NetSys clients, and this corner of the county is routine dispatch range. Day to day runs on 24/7 remote monitoring and a help desk with written response commitments; engineers come out for projects, hardware, and the free on-site penetration test.
What separates NetSys from the IT firm we already have?
Ask your current provider three questions: what are your written response times, when was our last tested restore, and can we leave next month if you slip? Our answers are on this site — committed response tiers, restores run on the record, and month-to-month terms held since 1998. If their answers are as good, keep them; if not, switching is a process we run without a coverage gap.
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.