Fractional leadership is senior ownership of a function on a part-time, embedded basis (typically one or two days a week on a defined term). Applied to search, it means someone accountable for the roadmap, the vendor relationships and the standard of the work, without the cost, notice period or six-month search that comes with a permanent Head of SEO. The model is closest to a fractional CMO or CFO arrangement, scoped to a channel where the technical judgment is unusually hard to interview for.
The role is deliberately temporary and its deliverables are organizational rather than tactical: a prioritized roadmap the executive team has actually agreed to, an agency or in-house team operating to a defined standard, a hiring profile for the permanent owner, and documented decision frameworks that outlive the engagement. Execution stays with the people who will still be there next year; the fractional lead sets direction, arbitrates between priorities and holds the standard.