Quad-C Management, a middle market private equity firm, completed the investment in S.i. Systems, a IT staffing company in Canada. Financial terms were not disclosed. “This is a tremendous opportunity to grow personally and professionally as we continue the buildout of S.i. Systems. Quad-C has proven expertise in professional staffing and brings a new level of strategic and operational insight to the company. We both love the industry and believe we can provide even more value to our clients and consultants. This accelerates our ability to grow organically and via quality acquisitions," Derek Bullen, S.i. Systems CEO.