What a field CTO is

A field CTO is a technology leader who works in the field, meaning out with customers, partners, investors or portfolio companies, rather than running an internal engineering team day to day. The title originated inside software vendors, where the most credible engineer in the room is sent to talk to a customer’s executives about architecture, security and roadmap. The point is trust: a buyer believes a peer who has built and run systems more readily than a salesperson reading a script. Over time the pattern spread beyond vendors. Private equity firms, consultancies and advisory practices now use the same idea, placing an experienced operator alongside a business to guide its biggest technology choices without taking the permanent seat.

The defining feature is that a field CTO advises and influences rather than owns the org chart. They carry the authority of having done the job before, and they apply it to your situation, your contracts and your risks. That is also why the role overlaps so heavily with fractional and interim technology leadership, which is exactly what Starkhorn provides through its fractional CIO and CISO service.

What a field CTO actually does

The work falls into a few recognisable patterns. In a vendor or partner setting, the field CTO is the technical voice in front of a prospect’s leadership: explaining how a platform fits an existing estate, answering security and integration questions honestly, and shaping the solution so it survives contact with production. In an investor or advisory setting, the focus shifts to diligence and value creation. The field CTO assesses the technology and team behind a deal, sets the priorities for the first hundred days, and stays close enough to hold delivery to account.

Across both, the recurring tasks look like this:

• Translating commercial strategy into a technology and security plan the board can fund and measure, the discipline at the heart of Daniel’s book and of Starkhorn’s IT strategy consulting.
• Running or supporting technology due diligence before a transaction, so buyers understand what they are really acquiring.
• Setting the security agenda, from board cyber governance to a tested incident response plan.
• Bringing order to fast-moving topics such as AI governance and the shadow AI spreading quietly through most organisations.

When a business needs a field CTO

You feel the need before you can name it. A growth-stage company is about to sign with a strategic platform vendor and has nobody senior enough to challenge the architecture. A founder is heading into a funding round and knows the technology will be picked apart. A private equity sponsor has just bought a business whose IT and security have never faced a serious question. A board has approved a transformation programme and realises, too late, that there is no one who can hold the delivery partners to account.

In each case the common thread is a decision too large to get wrong and a gap where the experienced voice should be. Hiring a permanent chief is slow and, for a single decision or a defined phase, disproportionate. A field CTO, or its closest in-house cousin the fractional or interim leader, closes that gap in days rather than months. If you are unsure whether the gap is real, the free interim CIO leadership gap view and the diagnostic at the end of this page will tell you plainly.

How a field CTO differs from a CTO, CIO and CISO

The titles sound similar and the confusion is understandable. A traditional CTO owns the technology a company builds and the engineering team that builds it, with full operational accountability. A CIO owns the internal technology estate, the systems the business runs on. A CISO owns security and risk. A field CTO is different in posture rather than subject: the same depth of expertise, applied from alongside the business or on behalf of a vendor or investor, without permanently holding any of those seats.

That distinction matters when you choose what to hire. If you need someone to run a department, you want a permanent or interim chief. If you need a credible operator to guide a specific set of decisions, represent you in a deal, or steady a portfolio company, the field CTO model fits. In practice many mid-market businesses get the best of both through fractional leadership, where one experienced person carries genuine accountability for technology and security on a part-time basis. Starkhorn delivers this as a virtual CIO and, on the security side, as a virtual CISO through its CISO as a service. If you want the security distinction spelled out, the explainer on what a vCISO is sits alongside this one.

Why the security dimension is rarely optional

A field CTO who ignores security is not doing the job. The cost of getting it wrong is no longer abstract: the IBM Cost of a Data Breach Report 2025 puts the global average breach at USD 4.44 million, and the Information Commissioner’s Office fined British Airways £20 million in 2020 and Interserve £4.4 million in 2022 over personal data failures. For a board, that is reason enough to want the security view embedded in every major technology decision rather than bolted on afterwards.

This is why Starkhorn deliberately joins the technology and security roles together. The same engagement can cover cyber security consulting, readiness for regulation such as NIS2 compliance, sector-specific work like cyber security in financial services, and practical resilience including ransomware readiness. One leader, one view of risk and opportunity, no gap between the people who choose the technology and the people who have to defend it.

What it costs and how engagements are shaped

A permanent senior technology leader is expensive and, for many businesses, hard to justify full time. UK CISO salaries alone run roughly £95,000 to £600,000 or more depending on sector and scope, before the cost of recruitment and the wait. A field CTO style engagement is sized to the need: a focused piece of diligence, a transformation phase, a steadying hand on a portfolio company, or an ongoing fractional commitment of a day or two a week. You pay for the judgement, not for a permanent headcount you do not need. Starkhorn’s pricing is transparent, and the CIO and CISO cost calculator lets you compare a fractional arrangement against a permanent hire before you commit.

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 interim leadership inside a private-equity-backed group and permanent ownership of both the technology and security agenda at a national business is exactly the field experience a field CTO engagement calls for, applied from alongside your board rather than from a permanent seat.

Frequently asked questions