Cybersecurity Services in San Francisco, CA
San Francisco companies keep investor data, client files, research and customer records in cloud tenants that attackers probe every day. NetSys hardens the identities, devices and email behind them, watches every endpoint through ThreatDown managed detection and response, and prepares you for California's breach and audit rules, all delivered remotely from Brooklyn.
The short answer
NetSys provides cybersecurity services to San Francisco businesses: ThreatDown managed detection and response with a staffed security operations center, Microsoft Defender for Business, Entra ID Conditional Access and multifactor authentication, Barracuda email protection, KnowBe4 training, Keeper password management, Rapid7 InsightVM vulnerability scanning and immutable backups. The work is remote and cloud-based from our Brooklyn office, and NetSys does not send engineers on site in San Francisco. Monitoring and emergency response run 24/7, and the help desk is staffed daily from 1 a.m. to 8 p.m. Pacific. A free external penetration test, within an agreed scope, is available.
Service information by The NetSys Group. Our editorial standards.
How cybersecurity is delivered for San Francisco companies
Every control in this service is applied and watched remotely. ThreatDown agents report to a security operations center that investigates alerts at any hour and can isolate an infected laptop from the network. Our engineers in Brooklyn manage Conditional Access, Defender and Intune policy through your Microsoft 365 tenant, tune Barracuda filtering and run Rapid7 InsightVM scans against your devices and your public addresses. NetSys does not send engineers on site in San Francisco, and the security work does not depend on it: Cisco Meraki or Fortinet firewalls are configured before they ship, and your team or your building's contractor connects them. During an incident, the affected laptop is isolated and kept for investigation, and a clean replacement ships enrolled through Windows Autopilot so the user can get back to work. Monitoring runs 24/7 from Brooklyn, and so does emergency service. Our staffed help-desk hours are 4 a.m. to 11 p.m. Eastern time (1 a.m. to 8 p.m. Pacific), seven days a week. The proposal states severe-incident escalation, authorized remediation and any other after-hours work.
Attacks that hit San Francisco startups and venture firms
The usual breach at a San Francisco startup is not an exotic exploit. It is an attacker who phones the help desk posing as an employee to get a password or multifactor reset, a consent prompt that grants a malicious app access to a mailbox, or a spoofed email that changes the wiring instructions on a vendor payment or a closing. Venture and investment firms see the last one around capital calls and distributions. Each has a specific control: identity checks by callback before any reset, a rule that only administrators can approve third-party app consent, Conditional Access that requires a managed device, DMARC enforcement to reduce spoofing of your domain, and a written payment-change procedure that requires a call to a known number. KnowBe4 simulations then test staff against the same lures.
Two San Francisco incidents worth learning from
In November 2016, ransomware reached roughly 2,000 computers at the San Francisco Municipal Transportation Agency, by press accounts; ticket machines went down and Muni opened its fare gates for two days while it restored systems, and the agency did not pay the 100-bitcoin demand. In March 2020, San Francisco International Airport found malicious code planted on two of its websites, SFOConnect and SFO Construction, aimed at stealing the Windows sign-in credentials of people using personal devices, and it forced a reset of all SFO email and network passwords. Neither attack used anything new: the Muni malware was a known strain, and the airport attack went after passwords on machines the airport did not manage. Scheduled InsightVM scanning, prompt patching, network segmentation and blocking unmanaged devices from company resources answer both.
California breach and audit rules for San Francisco businesses
California Civil Code section 1798.82 now sets a clock: since January 1, 2026, affected residents must be notified within 30 calendar days of discovering a breach, and a business notifying more than 500 residents must send a sample notice to the Attorney General within 15 days of notifying them. Under the CCPA, consumers can sue when nonencrypted personal information is stolen because a business failed to maintain reasonable security, with statutory damages now set at $107 to $799 per consumer per incident. CCPA regulations effective January 1, 2026 add cybersecurity audits, with the first certifications due April 1, 2028 for businesses over $100 million in revenue. SEC-registered investment advisers also follow amended Regulation S-P, which requires an incident response program and customer notice within 30 days. This is general information, not legal advice.
The first 30 days of a security engagement
Days one to ten are measurement. ThreatDown goes onto every endpoint, InsightVM runs its first internal and external scans, and an engineer reviews the Microsoft 365 or Google Workspace tenant: every administrator, every account without multifactor authentication, every third-party app with mailbox or file access, every forwarding rule that sends mail outside the company. Days eleven to twenty fix the high-risk items in an agreed order, usually multifactor authentication for everyone, removal of stale accounts and risky app grants, Conditional Access and DMARC. By day thirty you have immutable backups proven with a restore, a written incident response plan that names who calls counsel and the insurer, and a findings report ranked by risk. The free external penetration test can run in the same window if you want an outside view.
Cybersecurity in San Francisco: what NetSys delivers
Detection and response
- ThreatDown managed detection and response with EDR agents on every workstation, laptop and server, monitored 24/7
- Microsoft Defender for Business and Rapid7 InsightIDR telemetry from identities, email and endpoints, with a person acting on alerts
Identity and email
- Entra ID Conditional Access and multifactor authentication across Microsoft 365, with legacy authentication switched off
- Privileged access and privileged identity management so admin rights are granted just in time and removed afterwards
Exposure and recovery
- Rapid7 InsightVM vulnerability scanning on a schedule, with findings fixed rather than filed
- Cisco Meraki or Fortinet firewall management, segmentation and DNS filtering on office and remote devices
Firewall, antivirus and maintenance for a five-person office
A five-person office needed the basics done properly rather than an enterprise stack. NetSys replaced the internet provider's router with a business-grade firewall configured with sensible rules, secure remote access and logging, deployed managed antivirus on every machine with updates and alerts handled centrally, and put patching, backup checks and health reviews on a schedule. The agreement covers what the office needs and nothing it does not, month to month. No outcome figures were measured for publication.
Cybersecurity work for other clients
- Insurance
Regional title insurance company
Barracuda email protection for 85 users, phishing simulations, employee security training, and MFA deployment.
Security Awareness & Phishing TrainingIT for Insurance Agencies and Brokers
Client names are withheld. These examples were chosen for the work involved, not for where the client is, so none is presented as a San Francisco client.
What cybersecurity costs in San Francisco
Cybersecurity is priced per user per month when it runs as an ongoing service, and per project for an assessment or a remediation. What moves the number: how many devices and identities are in scope, how much incident remediation and recovery is needed beyond the monitoring and authorized MDR actions in scope, which compliance standard the evidence has to satisfy, and whether the Microsoft 365 tenant is already on Business Premium or the security tooling comes from us. The free external penetration test costs nothing and runs remotely before any of that. Our managed IT pricing page explains how the fee is built.
Who this fits, and who it does not
Best fit: businesses with enough people, money movement or regulated data that a breach would hurt, and no security team of their own: professional practices, healthcare groups, importers, financial firms, nonprofits and agencies holding client credentials. Companies with an internal IT person fit as a co-managed arrangement.
Read next
Industry pages: IT for Startups · IT for Financial Services
Terms used on this page: Managed Detection and Response (MDR) · Endpoint Detection and Response (EDR) · Conditional Access
Guides: MDR versus antivirus for a small business · the Conditional Access policies to turn on first
Related pages
Read the full Cyber Security service page. See everything NetSys delivers in San Francisco Bay Area.
Also in San Francisco: Managed IT Services · IT Consulting · IT Support
Cybersecurity elsewhere: Palo Alto · Los Angeles · San Diego · California · Irvine · Orange County
Related services: Penetration Testing · Cyber Insurance Readiness · Security Assessments · Managed Detection & Response (MDR)
Cybersecurity in San Francisco: FAQs
How does cybersecurity work for San Francisco organizations?
It is delivered remotely. ThreatDown watches every endpoint around the clock through a staffed security operations center, our engineers manage identity, device and email policy in your Microsoft 365 tenant from Brooklyn, and InsightVM scans run on a schedule. Your team reaches the help desk from 1 a.m. to 8 p.m. Pacific, seven days a week, and a suspected incident goes straight to your dedicated engineer at any hour. NetSys does not send engineers on site in San Francisco; network equipment arrives configured, and replacement laptops arrive enrolled.
How much do cybersecurity services cost in San Francisco?
Security is built into every NetSys managed IT agreement, which is priced per user per month after an assessment. Companies that keep their own IT staff can buy the security stack on its own, priced the same way. The figure depends on the number of users and devices, how many cloud tenants and public systems are in scope, the evidence you need for an auditor, insurer or SOC 2 report, and incident response expectations. Projects such as a SOC 2 readiness program or internal penetration testing are quoted after scoping. NetSys does not publish prices.
Can NetSys help a San Francisco startup prepare for a SOC 2 audit?
Yes, on the technical and evidence side. Enterprise customers often ask a startup for a SOC 2 report before signing, and most of the controls an auditor tests are ones we already run: multifactor authentication, device encryption and management in Intune, endpoint detection, logging, vulnerability scanning, backups and access reviews. We map those controls to the criteria, help write the policies, and collect screenshots and logs into an evidence folder. The audit itself is performed by an independent CPA firm you choose.
What happens if our San Francisco office is hit by ransomware?
The call goes straight to your dedicated engineer, not a queue. ThreatDown isolates the affected machines, we cut the attacker's access by resetting credentials and revoking sessions, and we preserve evidence for your insurer and counsel. Recovery comes from immutable backups. NetSys has handled more than 30 ransomware incidents in three years, every one fully recovered, and clients with a disaster recovery plan in place were back within 24 hours. Your counsel decides on notifications, and California's 30-day clock makes it worth calling them early.
What does the free external penetration test cover?
It is a remote test of your internet-facing systems within a scope we agree in writing: your public IP addresses, websites, remote access gateways and email services, for example. Engineers look for exposed services, weak configurations and known vulnerabilities, then deliver a written report ranked by risk with recommended fixes. It does not include internal network testing, web application testing in depth or remediation work; those need a separate scope. Many San Francisco companies use the report as a first look before deciding on managed security.
See what an attacker sees before they do.
The free assessment is a remote external penetration test, limited to the information available to NetSys and the external scope we agree with you. Internal reviews and ongoing security management are scoped separately.