Systems Interface was founded around a straightforward belief: work hard, enjoy the work, and become an industrial controls system integrator second to none.
More than four decades later, that vision still shapes how SII approaches its customers, projects, and people. The company brings practical engineering, broad technical experience, and long-term responsibility together around the systems customers depend on.
Work hard, have fun, and be an industrial controls system integrator second to none.
Thor Bussinger · Founder
SII supports projects from initial engineering and system design through programming, manufacturing, integration, testing, startup, commissioning, modernization, and lifecycle support.
The company’s 24,000-square-foot Mukilteo headquarters includes a 15,000-square-foot UL-certified manufacturing facility supporting custom panels, OEM production, repeat builds, and higher-volume panel manufacturing.
That connection between engineering and manufacturing helps decisions move cleanly from the control architecture into the hardware, testing, documentation, and finished system.

Own the challenge, develop a solution around the application, and remain available after startup.
Work as one team across engineering disciplines, suppliers, partners, OEMs, and customers.
Use diverse experience to solve difficult problems while continuing to develop the people behind the work.
Bring the right disciplines together around the actual operating requirements of the system.
Carry quality from project definition through engineering, manufacturing, testing, and customer approval.

CEO · 35 YEARS AT SII
Experience spanning project engineering, company leadership, marine, infrastructure, drive systems, aerospace crane controls, marine winches, and antenna-drive applications.

PRESIDENT · 31 YEARS AT SII
A Control Systems P.E. with experience in municipal controls, telemetry, complex process applications, project management, and long-term company leadership.

VICE PRESIDENT OF SALES · 38 YEARS AT SII
Experience across aerospace, food and beverage, material handling, hydroelectric power, HMI design, business development, and customer support.

VICE PRESIDENT OF ENGINEERING · 30 YEARS AT SII
An electrical engineer with deep experience in AC and DC drive integration, marine applications, antenna systems, project engineering, and engineering leadership.

Gold Level System Integrator Partner

Industrial and hazardous-location control panels
ISA/IEC 62443
Industrial automation cybersecurity certification

Recognized integration capability

Process automation system experience

Low-voltage drive systems capability

Recognized drives capability

Motion-control integration capability

Recognized visualization capability

Recognized control capability

Recognized data platform capability

Recognized panel capability

Industrial software platform support

SCADA and HMI platform support