A Chief Technology Officer (CTO) is the senior executive responsible for a company's technical strategy, architecture decisions, and engineering organisation. At early-stage companies, the CTO is often a co-founder who codes and makes foundational architectural decisions. At growth-stage companies ($10M–$100M ARR), the CTO shifts to engineering leadership, talent strategy, and technical product direction. The profile, scope, and compensation change significantly across company stages.
The CTO Role Across Company Stages
The CTO title represents fundamentally different roles at different company stages. At a seed-stage startup (1–15 engineers), the CTO is typically a technical co-founder who writes production code, makes every architectural decision, and personally interviews and hires engineers. At a Series B company (30–80 engineers), the CTO is shifting from direct contribution to engineering leadership — managing managers, setting technical direction, and ensuring delivery velocity.
At a late-stage company (200+ engineers), the CTO is almost entirely a strategy, talent, and executive leadership role — setting 3-year technical roadmaps, representing technology to the board, building an engineering culture that attracts talent, and making platform bets that determine competitive positioning.
CTO Role by Stage
CTO vs VP of Engineering
In companies with both a CTO and a VP of Engineering, the distinction is critical: the CTO owns technical vision and external representation (speaking at conferences, building technical credibility in the market, setting the engineering brand), while the VP of Engineering owns engineering execution — delivery, process, headcount, and team health.
Companies that merge these functions into a single 'CTO' role often get mismatches: a technically brilliant CTO who cannot manage a 60-person team, or an operationally excellent VP of Engineering who has no credible technical vision. Understanding which role you actually need is the first step in any engineering leadership search.
“Most CTO mis-hires come from hiring a great engineer into an engineering leadership role, or hiring a great engineering leader into a technical vision role. These are different jobs. The intake needs to define which one is open.”
Hiring a CTO for a Growth-Stage Company
The most common failure in CTO hiring is searching for a seed-stage profile (technical excellence, hands-on) when the company needs a Series B profile (leadership, delegation, process). The candidate who was right for 5 engineers is often wrong for 50.
A strong Series B–C CTO candidate has: demonstrated ability to lead engineering organisations of comparable scale, experience navigating a technical debt or platform scaling challenge, a clear philosophy on engineering culture and talent development, and the credibility to attract senior engineering talent through their reputation and network.