Reliable technology is essential for running a successful small business. When computers, networks, or phone systems fail, productivity stops and costs increase. Computer Guy provides professional IT services designed specifically for small business environments in Rapid City and throughout the Black Hills.

Reliable technology is essential for running a successful small business. When computers, networks, or phone systems fail, productivity stops and costs increase. Computer Guy provides professional IT services designed specifically for small business environments in Rapid City and throughout the Black Hills.
Computer Guy is a locally owned IT services company founded in 2003 and based in Rapid City, South Dakota. The company is owned and operated by Alec Demoise and partners. Computer Guy has built a reputation for providing dependable, business-focused IT support to small organizations across the Black Hills.
Unlike consumer computer repair shops, Computer Guy works exclusively with small businesses. Services are structured around long-term reliability, security, and performance rather than one-time fixes. Clients rely on Computer Guy for straightforward guidance, responsive support, and technology solutions that support real business needs.
With over two decades of experience, Computer Guy understands the challenges small businesses face and delivers IT services designed to scale as organizations grow.

Computer Guy works exclusively with small businesses, supporting professional offices, contractors, nonprofits, and growing organizations. Every service is structured to reduce downtime, improve communication, and keep daily operations running smoothly.

Ongoing IT management for small businesses that want dependable systems and predictable support. Managed services include proactive monitoring, system maintenance, updates, and performance optimization to prevent problems before they disrupt operations.

Modern business phone systems that allow personnel to send and receive calls from the office, remote locations, or mobile devices. VOIP solutions improve flexibility, scalability, and communication without the limitations of traditional phone systems.

Cybersecurity solutions designed to protect business workstations, networks, and sensitive data. Security services help reduce the risk of malware, unauthorized access, and data loss that can impact business continuity.

Reliable data backup and recovery solutions that protect critical business information. Backup and continuity planning ensure important files remain accessible and recoverable in the event of system failure or data loss.

Professional IT support provided by appointment, both remotely and on-site. Remote support resolves many issues quickly, while on-site service ensures business systems and networks receive hands-on attention when required.

Business network setup, maintenance, and support to ensure stable and secure connectivity. Networking services support office infrastructure, equipment configuration, and performance optimization for business operations.
Small Business Focus
Computer Guy works exclusively with small businesses. Services are designed for professional offices, contractors, nonprofits, and growing organizations.
Established and Locally Owned Since 2003
With over two decades of experience serving the Rapid City area, Computer Guy brings proven reliability and long-term local knowledge to every client relationship.
Proactive, Not Reactive IT Support
Issues are addressed before they disrupt your business. Proactive monitoring and maintenance help reduce downtime and prevent costly technology failures.

Business-Grade Security and Data Protection
Security services are built to protect business systems, networks, and data from modern threats, helping reduce risk and support business continuity.
On-Site and Remote Support by Appointment
Support is provided when it is needed, either remotely or on-site. Appointment-based service ensures focused attention and professional results.
No Call Centers or Outsourced Technicians
All services are delivered locally. Businesses work directly with a trusted IT professional who understands their systems and ongoing needs.

Computer Guy provides small business IT services throughout the Black Hills, including Rapid City, Sturgis, Spearfish, Deadwood, Lead, and Belle Fourche. Support is delivered by a local provider who understands the technology needs of businesses in the region.
There are no call centers or outsourced technicians. Businesses receive consistent, responsive IT support from a trusted local professional who is familiar with their systems and environment.
Both options are available. Some businesses need ongoing managed IT services for proactive monitoring and maintenance, while others may need help with a specific issue or project. Support is provided by appointment and tailored to the needs of each business, without requiring unnecessary long-term commitments.
Yes. Many issues can be resolved quickly through secure remote support, reducing downtime and response time. When hands-on assistance is required, on-site service is available by appointment to address hardware, networking, or infrastructure-related needs directly at the business location.
Computer Guy works with small businesses across a wide range of industries, including professional offices, contractors, nonprofits, and growing organizations. Services are designed for businesses that rely on stable systems, secure data, and dependable communication to operate efficiently.
No. All services are provided by appointment only. This approach ensures focused, professional support and allows proper planning for each business environment. Appointment-based service also helps maintain consistent service quality and reliable response times for existing business clients.
If your business needs reliable IT services, secure systems, or a modern business phone solution, Computer Guy is ready to help. Support is designed specifically for small business environments and provided by appointment to ensure focused, professional service. Whether you need ongoing IT management or help with a specific business technology challenge, Computer Guy delivers dependable solutions that keep your operations running smoothly. Call (605) 787-5537 to schedule an appointment and discuss your business IT needs.
Address : 1141 Rand Rd A Rapid City, SD 57702
By Appointment Only
Phone : (605) 787-5537
Mail: PO Box 3213 W. Main St #150
Rapid City, SD 57702
Monday: 8:00 AM – 4:00 PM
Tuesday: 8:00 AM – 4:00 PM
Wednesday: 8:00 AM – 4:00 PM
Thursday: 8:00 AM – 4:00 PM
Friday: 8:00 AM – 4:00 PM
Saturday: Closed
Sunday: Closed
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