Charles A. Ambrosecchia
Founder & CEO | Sigma Networks
Helping businesses get more from their technology, stay secure, and stop losing time to IT problems.
I founded Sigma Networks because business owners should not have to become IT experts just to keep their companies running.
Technology affects nearly everything a business does today. When the network is unreliable, employees cannot work. When phones go down, customers cannot reach you. When security is weak, one bad email can become a very expensive problem. And when several vendors are involved, everyone tends to point at someone else.
Sigma Networks brings managed IT, cybersecurity, networks, cloud services, business phones, backup, and disaster recovery together under one roof. My goal is simple: give our clients reliable technology, clear advice, and one company that takes responsibility for the whole environment.
How I Can Help
Managed IT and Support
We monitor, maintain, and support your technology so problems are handled before they interrupt the business. This includes help desk support, patching, device management, vendor coordination, and long-term planning.
Cybersecurity
We help protect your people, systems, and data with managed security, endpoint protection, firewalls, email security, threat monitoring, vulnerability management, and practical employee guidance.
Networks and Wi-Fi
We design and support reliable business networks, secure Wi-Fi, firewalls, VPNs, SD-WAN, multi-location connectivity, and the infrastructure needed to keep everyone connected.
Cloud and Microsoft 365
We help businesses move to, manage, and secure cloud platforms including Microsoft 365 and Azure. We also handle migrations, identity, access, collaboration, and cloud security.
Business Phones and VoIP
Through SigmaVoIP, we provide modern business phone systems, SIP services, call routing, mobile and remote extensions, contact center tools, and unified communications.
Backup and Business Continuity
We protect critical data and create realistic recovery plans so a hardware failure, ransomware incident, outage, or other disruption does not become a business-ending event.
Technology Strategy
We help owners and leadership teams make better technology decisions, plan budgets, reduce risk, evaluate vendors, prepare for growth, and build an IT roadmap that supports the business.
Who We Work With
Sigma Networks works with small and mid-sized businesses across Dallas-Fort Worth, throughout Texas, and nationwide. We are especially well suited for organizations where downtime, security failures, or poor documentation can create serious business or regulatory problems.
- Healthcare practices and medical groups
- Law firms and legal organizations
- Accounting, financial services, insurance, and mortgage businesses
- Engineering, architecture, real estate, and professional services firms
- Manufacturing and multi-location businesses
- Organizations that must meet HIPAA, PCI DSS, FINRA, SEC, CMMC, cyber insurance, or other compliance requirements
Why Clients Choose Sigma Networks
Founder-led and personally accountable
Sigma is independently owned. There is no distant holding company and no maze of departments. I remain involved, and clients can reach the person responsible for the company.
One partner instead of several vendors
We can manage the network, computers, cloud, cybersecurity, phones, backups, and support. That means fewer handoffs, less finger-pointing, and a much clearer path when something needs attention.
Proactive and security-first
We do not wait for something to break before paying attention. We monitor, maintain, secure, document, and plan so problems are less likely to become emergencies.
Built for real business environments
Our work is not limited to fixing laptops. We understand networks, telecom, cloud systems, data centers, multi-location operations, regulated environments, and the way technology affects daily business operations.
Straightforward communication
Clients should understand what is happening, why it matters, and what it will cost. We explain technology in plain language and make recommendations based on the business, not on what is easiest to sell.