Jeff Kolez

I'm a Fractional CTO and senior engineering leader with 25+ years architecting and leading SaaS platforms, particularly through post-acquisition integration, founder-to-scale transitions, and overdue architecture rebuilds.

I'm known for diagnosing what's slowing a company down even when the answer isn't technical. I hold the engineering seat for the duration of an engagement — architecture decisions, team leadership, delivery oversight — and step out once the team is ready to hold it.

I've led a global customer experience platform through post-acquisition restructuring, transitioning a legacy monolith to microservices while preserving delivery velocity across 18 engineers and four continents. Earlier, as principal architect for products serving health and continuing-education organizations, I rebuilt a core real-time communications layer to support 20,000+ concurrent users — a 2000% capacity increase. Across my career I've led the re-architecture of four core monoliths and scaled distributed teams without attrition.

Best fit for founder-led SaaS, mid-market companies post-acquisition, and engineering orgs that have outgrown their original architecture. Stack-agnostic, owner-facing, written diagnostics on request.