What is a CTO, in one sentence

A CTO is the executive accountable for the direction of a company’s technology: the architecture of its products, the engineering teams that build them, and the technical bets that decide whether the business can deliver on its commercial ambition. In a software or product company, the CTO is usually the most senior technical voice in the room and frequently sits on the executive committee or the board. The role is outward and forward looking. Where some technology leaders are judged on keeping the lights on, a CTO is judged on what the company can create and ship.

What a CTO actually does

The honest answer is that the job changes with the size and stage of the company. In an early stage startup, the CTO often writes code, hires the first engineers and personally owns the architecture. In a scaling business, the CTO stops building and starts building the people and systems that build: setting technical standards, choosing the platforms the company will live with for years, and deciding what to make versus what to buy. In a larger organisation, the CTO becomes a strategist and a translator, turning commercial goals into a technology roadmap the board can fund and the engineering organisation can execute.

Across all of those stages, a good CTO owns four things consistently: the technology vision and how it maps to revenue, the architecture and key build-versus-buy decisions, the engineering organisation and its ability to deliver, and the technical risk that comes with every platform choice. That last point is where the CTO brief overlaps with security and resilience, and where many growing companies discover a gap. You can see how Starkhorn closes the broader leadership gap on our fractional CIO and CISO page and our IT strategy consulting page.

When a business actually needs a CTO

Not every company needs a full time CTO, and hiring one too early is an expensive mistake. The signals that a business genuinely needs technology leadership at executive level are practical: product decisions keep stalling because no one owns the technical direction, engineering effort goes into rework rather than progress, the founders are making architecture choices they are not equipped to make, or investors are asking how technology will scale and there is no credible answer. A funding round, an acquisition, or a step change in customer numbers tends to expose the gap fastest.

The mistake many leadership teams make is assuming the only options are a permanent hire or nothing. There is a wide middle ground. A fractional or interim technology leader can give you board level direction without a board level salary, which is the model Starkhorn is built around. If you are weighing the cost of the various options, our CIO and CISO cost calculator and our pricing page set out the numbers plainly.

CTO versus CIO: the difference that matters

This is the comparison that causes the most confusion, because both titles cover senior technology. The simplest distinction: a CTO is usually focused on the technology the company sells or builds, while a CIO is focused on the technology the company runs to operate. The CTO thinks about products, engineering and external technical strategy. The CIO thinks about internal systems, data, infrastructure, IT operations and how technology makes the whole organisation more effective. In a software company the CTO often dominates. In a non-software business such as retail, manufacturing or professional services, the CIO role is frequently the more important of the two.

In mid-market companies the two roles often blur into one person, and that person may be served better by a fractional model than a permanent appointment. Starkhorn provides exactly this through its virtual CIO service, and you can read how a part time technology director works in practice on the interim CIO leadership gap page. For boards trying to set technology direction at strategy level, the board IT strategy page goes deeper.

CTO versus CISO: technology versus security

A CTO builds. A CISO, the Chief Information Security Officer, protects. The two roles are distinct and increasingly should not be held by the same person, because the CTO is incentivised to ship and the CISO is incentivised to challenge. A CISO owns information security strategy, governance, regulatory compliance and the response when something goes wrong. The financial stakes are real: the IBM Cost of a Data Breach Report 2025 put the global average cost of a breach at USD 4.44 million, and UK regulators have acted decisively, with the ICO fining British Airways £20 million in 2020 and Interserve £4.4 million in 2022.

Many growing companies need security leadership long before they can justify a full time CISO, which is why fractional and virtual security leadership has become common. Starkhorn delivers this through CISO as a service and a virtual CISO, with deeper detail on the model at what is a vCISO. Where the brief is broader cyber strategy rather than a named officer, our cyber security consulting service applies.

The CTO and the modern risk agenda

The technology a CTO chooses now carries obligations that did not exist a few years ago. Artificial intelligence is the clearest example: every CTO is being asked to adopt AI at speed while the board worries about governance, data exposure and unsanctioned tools spreading through the workforce. These are not abstract concerns, and they sit at the seam between the CTO who wants to build and the leadership team that has to answer for the consequences. Starkhorn addresses this directly through AI governance and the practical problem of shadow AI.

Regulation and resilience belong on the CTO agenda too. Companies in scope of newer rules need a plan, which is where NIS2 compliance and board cyber governance come in, and every business that depends on its systems needs to know it can recover, the subject of our incident response plan and ransomware readiness work. For investors and acquirers assessing a target’s technology, technology due diligence turns the CTO’s domain into a clear picture of risk and value.

Why Starkhorn

Starkhorn is led by Daniel J. Jacobs, who has spent over 20 years in technology and security, 15 of them in leadership roles, including Interim Group Technology Director at VetPartners, the BC Partners-backed veterinary group, and CIO and CISO at Jardine Motors Group. He is the author of The Strategy Bridge and holds PRINCE2, ITIL Foundation and full membership of the Institute of Interim Management.

That mix of group technology direction at VetPartners and combined CIO and CISO ownership at Jardine Motors Group is precisely the executive technology and security leadership a growing business looks for when it is weighing whether to appoint a CTO, and how to do so without overpaying for a role it may only need part of the time.

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