IT Services and Cybersecurity in St. Louis, MO
From Clayton and the Central West End to Chesterfield Valley, St. Charles County and the Illinois side of the river, St. Louis organizations run on Microsoft 365, cloud applications and networks that have to survive tornadoes, flash floods and ransomware. NetSys is the IT company that takes the whole job, from the help desk to security, backups and vendors, and runs it remotely from Brooklyn.
The short answer
St. Louis organizations on both banks of the Mississippi can hand NetSys their entire IT and security workload and have it run remotely. Under a single agreement with no long-term commitment, our engineers staff the help desk, manage laptops and the Microsoft 365 tenant, operate ThreatDown detection and response, look after firewalls and Wi-Fi, test backups by restoring them, deal with your vendors and deliver consulting projects. Our only office is in Brooklyn, roughly 870 miles away, so no engineer is sent to the region; equipment arrives preconfigured for your staff or cabling contractor to connect. Engineers pick up calls from 3 a.m. to 10 p.m. Central, monitoring continues overnight, and the monthly per-user price follows an assessment.
- One office, in Brooklyn, NY; St. Louis and the Illinois Metro East are supported remotely, and NetSys does not send engineers on site in either state
- Laptops enroll in Intune and Windows Autopilot before shipping; firewalls and access points arrive configured for installation by your staff or contractor
- Monitoring and emergency service run 24/7; the help desk is staffed seven days a week from 4 a.m. to 11 p.m. Eastern time (3 a.m. to 10 p.m. Central)
- Month-to-month agreements and 98% client retention
What an IT company handles for a St. Louis business
St. Louis has a deep bench of large employers: BJC, Mercy, SSM Health and Washington University in medicine, Boeing in aerospace, Edward Jones and Centene in financial services and health insurance, Enterprise Mobility, and Bunge, which made the region its headquarters in 2019. Around them sit many smaller organizations with 10 to 150 people and no IT department of their own, such as Clayton law and accounting firms, wealth advisers in Town and Country, engineering offices, physician practices, distributors in Earth City and nonprofits in Grand Center. NetSys acts as the IT department for firms like these. Our engineers answer the staff's calls, manage computers and phones, run Microsoft 365, secure email and endpoints, test the backups, look after the firewall and Wi-Fi and deal with the internet carrier and software vendors. Where an internal IT person already exists, we divide the work in writing so both sides know who owns what.
How remote support works for a St. Louis office
We are clear about the model from the first call: St. Louis is roughly 870 miles from Brooklyn, NetSys does not send engineers into St. Louis or Illinois offices, and the service is built to need none. Onboarding a 20-person office takes three to four weeks. We install the NinjaOne agent and document the environment in IT Glue, then review the Microsoft 365 tenant for accounts without multifactor authentication, stale administrators, risky sharing links and mail forwarding to outside addresses. Devices move into Intune in groups, ThreatDown, Barracuda and Keeper go in, and replacement laptops are drop-shipped ready for first sign-in. When a new firewall or access point is needed, it arrives configured, and your office manager or low-voltage contractor installs it with our engineer on the phone. With St. Louis an hour behind New York, overnight maintenance is long finished when your staff log in.
St. Louis industries and the systems they run
Health care dominates the region's employment. BJC Health System, formed when BJC combined with Kansas City's Saint Luke's on January 1, 2024, operates Barnes-Jewish Hospital on the Washington University medical campus in the Central West End; Mercy runs its health system from Chesterfield, where it opened a virtual care center in 2015; SSM Health and St. Louis-based Ascension complete the picture. Physician groups, dental practices, therapy clinics and billing companies around them rely on an EHR and practice management system. Aerospace and defense is the second pillar: Boeing builds fighters in north St. Louis County and won the Air Force's F-47 contract in March 2025, and the National Geospatial-Intelligence Agency opened its $1.7 billion western headquarters in north St. Louis in September 2025. Financial services, agribusiness and biotech around the Cortex district and Creve Coeur fill out the list. We manage the infrastructure under each firm's core application and handle its vendor.
Tornadoes, flash floods and the St. Louis continuity plan
Recent weather has tested St. Louis offices hard. The EF3 tornado of May 16, 2025 cut a path through the city's north side and into St. Louis County, and a federal major disaster declaration followed on June 9. Three years earlier, on July 26, 2022, rainfall above 12 inches in parts of St. Charles County flooded homes and businesses and closed stretches of I-70, I-64, I-55 and I-44 at various times, and the winter flood of 2015 to 2016 along the Meramec River brought another declaration. Any of these can close an office for a week even when the building survives, because roads, power or the internet circuit do not. Our design response: data in Microsoft 365 and Azure, immutable backups held outside the region, laptops rather than desktops so people can work elsewhere, cellular failover on the firewall, and UPS units sized for a clean shutdown.
Security expectations from St. Louis's largest buyers
Many smaller St. Louis firms meet cybersecurity requirements first through a customer. Hospital systems send vendor questionnaires and business associate agreements to the practices, billing firms and software suppliers they work with, and the region has seen what an attack costs: Ascension's hospitals worked without full electronic records for weeks in 2024. Defense work brings DFARS 252.204-7012 and NIST SP 800-171 into machine shop and engineering contracts tied to Boeing, Scott Air Force Base and the NGA. Financial clients ask advisers and accountants how client data is protected under SEC and FTC rules. Our cybersecurity service answers those questions with evidence rather than promises: multifactor authentication reports, endpoint coverage, vulnerability scan results, backup restore logs and a written incident response plan, all kept current in IT Glue so a questionnaire takes an afternoon, not a month.
Missouri and Illinois data-security law
A St. Louis company with employees or customers on both sides of the Mississippi usually answers to two breach statutes. Missouri's RSMo 407.1500 requires notice to affected residents without unreasonable delay, adds the Attorney General and the national credit bureaus when more than 1,000 people are notified at once, and requires a written record, kept for five years, of any decision that a breach does not need notice. Across the river, the Illinois Personal Information Protection Act (815 ILCS 530) sets a standard of the most expedient time possible for notifying residents, brings in the Illinois Attorney General for any breach affecting more than 500 Illinoisans, no later than the residents themselves are told, and obliges the business to protect the data with reasonable security. The Illinois Biometric Information Privacy Act governs finger-scan time clocks and face readers at Metro East sites. Clinics, advisers, tax preparers and defense suppliers carry federal rules on top: HIPAA, SEC Regulation S-P, the FTC Safeguards Rule and DFARS. This is general information, not legal advice.
Towns and neighborhoods we cover around St. Louis, MO
- Downtown St. Louis and Washington Avenue
- Laclede's Landing
- the Central West End and Cortex
- Midtown and Grand Center
- Soulard
- Clayton
- Brentwood and Richmond Heights
- Creve Coeur
- Maryland Heights and Westport
- Chesterfield and Chesterfield Valley
- Town and Country and Des Peres
- Kirkwood and Webster Groves
- Earth City and Hazelwood
- St. Charles
- O'Fallon and St. Peters, MO
- Wentzville
- Belleville, IL
- Edwardsville, IL
- O'Fallon, IL and the Scott Air Force Base area
- Collinsville and Granite City, IL
Examples of our client work
- Healthcare
Three-location urgent care group
IT support for 36 workstations, patient data backups, endpoint protection, and secure networking across all three locations.
- Manufacturing
Large manufacturing plant in Virginia
Password management for 125 employees, management of 160 computers, and managed EDR antivirus across production and office devices.
- Wealth management
RIA firm
Barracuda email protection for 117 licensed users, email archiving, cybersecurity monitoring, and account access management.
Cybersecurity for Financial ServicesIT for RIAs and Wealth Management
Client names are withheld. These examples were chosen for the work involved, not for where the client is, so none is presented as a St. Louis, MO client.
Services in St. Louis, MO
Industry depth: IT for Healthcare · IT for Law Firms · Manufacturing · Wealth Management · Gov Contractors
Also from NetSys: small business IT support · 24/7 IT support
Next steps: Managed IT services in St. Louis · IT support and help desk in St. Louis · Cybersecurity services in St. Louis · Backup and disaster recovery in St. Louis · IT consulting in St. Louis · Managed IT services across Missouri · Managed IT services in Illinois · IT for healthcare organizations · IT for government contractors · IT for wealth management firms · IT for law firms
Nearby: Kansas City, MO · Indianapolis, IN · Louisville, KY · Nashville, TN
More in Missouri and Kansas: Overland Park, KS
St. Louis, MO FAQs
Who provides IT services in St. Louis?
St. Louis organizations can hire a local IT shop that sends technicians to the office or a managed service provider that works remotely. NetSys is the second kind: founded in 1998, with its only office in Brooklyn, it supports St. Louis and Metro East organizations over the network. A single contract takes in support calls, computers and phones, the Microsoft 365 tenant, security tools, backups, the office network and your technology vendors, and you deal with a dedicated account manager who has a real cell number. If you need someone in the building every week, we will tell you at the outset that we are not the right choice.
How does IT support work for St. Louis organizations?
Employees reach an engineer by phone, email or Teams from 3 a.m. to 10 p.m. Central, every day of the week, while monitoring and emergency service never stop. Computers are managed through NinjaOne and Intune, identities through Entra ID with Conditional Access, and firewalls and access points through their cloud dashboards, so nearly every fix happens remotely. NetSys does not send engineers into St. Louis or Illinois offices. Hardware ships configured, and physical tasks such as patching a cable or mounting an access point fall to your staff or contractor, with our engineer guiding.
How does remote onboarding work for businesses in St. Louis?
Onboarding runs in stages so no one loses a working day. The first week covers monitoring agents, documentation and the most urgent Microsoft 365 fixes, such as turning on multifactor authentication for every account. Devices then move into Intune a group at a time, often over a weekend, and on Monday staff sign in to the same email and files with stronger protection. New laptops arrive ready to use. Your account manager sends a short plan before each step, and the help desk takes calls from day one.
How much do IT services cost in St. Louis?
Both managed IT and IT support carry a monthly charge per person, worked out after an assessment, and no rate card is published. The amount depends on headcount and devices per person, the number of locations and whether any are in Illinois, servers still in the office, the security tools included, and the compliance evidence your clients, auditors or insurer expect. Projects such as an office move or a Microsoft 365 tenant migration are priced individually once scoped. You can end the agreement with a month's notice.
What services do you offer to businesses in St. Louis?
Most organizations start with managed IT, which bundles support calls, devices, Microsoft 365, patches, monitoring, backups and vendor handling into a per-person fee. Separate services build on it: a cybersecurity program with ThreatDown detection, Barracuda mail filtering, KnowBe4 phishing training, Rapid7 scans and penetration tests; backup and disaster recovery with scheduled restore tests; Cisco Meraki or Fortinet firewalls and Wi-Fi; evidence for HIPAA, SEC Regulation S-P, the FTC Safeguards Rule and NIST SP 800-171; and projects such as an Azure move or a Copilot rollout.
Do you support defense and aerospace suppliers in St. Louis?
Yes, remotely. Machine shops, engineering firms and software suppliers in the Boeing, Scott Air Force Base and NGA supply chains often carry DFARS 252.204-7012 and must protect controlled unclassified information under NIST SP 800-171 Revision 2. Although CMMC Phase 2 certification by outside assessors has been on hold since July 13, 2026, contractors must still self-assess, keep their SPRS score current and affirmed, and comply with the DFARS clause. We build a controlled enclave in Microsoft 365, document the controls, run vulnerability scans and help prepare the score. Your contracting officer and counsel confirm which clauses apply.
Is NetSys a St. Louis company?
No. Our only office is at 1 Prospect Park SW, Suite 6E, Brooklyn, NY 11215, and the main line is 845-203-3914. St. Louis runs one hour behind Brooklyn, which means our engineers are working before most St. Louis offices open and overnight maintenance is finished by morning. We have no staff in Missouri or Illinois and do not claim to. What we offer is a remote service refined since 1998, month-to-month terms and a dedicated account manager.
Talk to an engineer about your St. Louis office.
Book a call with an engineer to go through your current systems, what remote support covers in Missouri and Illinois and what an assessment would review.