Interface Systems
Interface Systems is a managed service provider based in St. Louis, Missouri. Founded in 1995, the company specializes in integrated physical security, business intelligence, and network and voice connectivity solutions for multi-location enterprises in commercial, retail, and residential sectors. They aim to simplify operations and maximize return on investment while providing strong customer support. The company offers a range of services, including managed business security with IP-based alarm monitoring, video surveillance, and access control. They also provide business intelligence solutions that deliver actionable insights to enhance operational efficiency. Additionally, Interface Systems delivers secure and scalable network and voice services tailored to the needs of multi-location businesses. With around 700 employees and annual revenues of approximately $246.7 million, Interface Systems is recognized for its positive company culture and commitment to customer satisfaction. They serve well-known clients, including multi-location restaurant chains, and focus on enhancing security and connectivity for their customers.
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Headcount trend
Interface Systems went from 386 employees in Jul 2023 to 366 in Jun 2025. Last 6 months: 9 people joined, 11 left.
Org structure
Headcount by department
Funding
- Jan 2021 · Private Equity · $60M · SunTx Capital Partners, Prudential Capital Partners
- Aug 2017 · Private Equity · $125M · SunTx Capital Partners, Prudential Capital Partners
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Interface Systems FAQ
How many employees does Interface Systems have?
Interface Systems has about 366 employees, down 0.3% over the last 3 months (as of Jun 2025).
What is Interface Systems's revenue per employee?
Interface Systems makes about $1.07M in revenue per employee, based on $390M annual revenue and 366 employees.
How much funding has Interface Systems raised?
Interface Systems has raised $185M in total funding; its latest round was Private Equity in Jan 2021.
Data from Company Prospectus, DOL LCA disclosures, WARN notices and 6figr salary profiles. Updated 27 Nov 2025.