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Fractional CTO — London & UK

Senior technical leadership for founders in the stage where technology decisions start to feel genuinely dangerous. Not a consultant writing reports. Not a full-time CTO you cannot yet justify. Embedded technical ownership for two to three days a week, until the internal team is ready to take the role on themselves.

When a Fractional CTO Makes Sense

There is a stage in a company's growth where nobody in the room has the experience to know which technology decisions will age well and which will become expensive mistakes eighteen months later. That is the gap this role fills. We cover the pattern in our guide to hiring a fractional CTO. The signals below are the ones that most often bring founders to us.

  • Your dev team has grown from two to eight or twelve people and nobody owns the architecture
  • You are locked into a single agency or vendor and cannot evaluate whether their recommendations serve your interests
  • Senior technical hires have failed because nobody in the business can evaluate technical depth
  • Technical debt is accumulating faster than your team can pay it down
  • Investors or board members are asking questions about technology that nobody internal can answer credibly
  • You are about to make a significant platform, architecture, or build-versus-buy decision and cannot afford to get it wrong

What You Actually Get

The distinction that matters is accountability. A consultant is paid for their opinion. A fractional CTO is accountable for outcomes — staying long enough to see decisions play out, adjust course when reality diverges, and build the internal capability the team needs to eventually operate without them. The best fractional CTOs think of themselves as temporary.

Architecture and Technical Strategy

Decisions that will still be defensible in three years — platform selection, build-versus-buy, data model, integration approach, hosting and cloud strategy. The kind of decisions that are cheap to make well up front and extraordinarily expensive to unwind later.

Hiring and Team Design

Defining what you actually need, writing the role, designing interviews that test for it, and evaluating candidates with the technical depth required. If the problem is really management or compensation, we will name it rather than solve it with another hire.

Vendor and Agency Management

Independent evaluation of existing agency work, negotiation from a position of knowledge, and honest assessment of when to build, when to buy, and when to keep what is already working. Most agencies act in good faith — but their incentives are not yours.

Board and Investor Communication

Translating technical reality into business terms. Technical due diligence, audit responses, and the governance frameworks that give investors confidence without strangling engineering productivity. Technology risk is business risk, and it deserves to be articulated properly.

Typical Engagement Model

Two to three days per week, minimum three to six months. London on-site presence at least once a week where it is useful — the informal conversation and observation that technical leadership depends on does not happen on video calls. Remote the rest of the time. Direct reporting line to the CEO or founder — burying a fractional CTO under a non-technical manager defeats the purpose of the role.

The first ninety days follow a predictable shape. Month one is assessment — auditing architecture, interviewing the team, understanding the business model. Month two is quick wins and strategic planning — two or three high-impact improvements delivered fast, alongside a longer-term strategy specific enough to act on. Month three is execution — architectural decisions, code review, mentoring senior engineers, and process improvements that outlast the engagement.

On pricing — engagements are scoped to what you need rather than rigid packages. Our Advisory & Strategy tier is the right starting point for most fractional CTO work. For a concrete number, the useful next step is a conversation about the problem.

Who You Are Working With

Rogue is led by founders who built the thing before advising on it. Our CEO spent seven years building Vanarama from a £20m business to a £200m AutoTrader acquisition — owning technology, product, and operations through every stage of that curve. The patterns on this page are not theoretical. They are decisions we have already made and mistakes we have already paid for.

The fractional CTO role sits alongside our digital strategy and legacy modernisation work. Whether you need fractional leadership, a full-time hire we help you recruit, or a strategic assessment, the starting point is the same — an honest evaluation of where you are, where you need to be, and what it will take to get there.

Frequently Asked Questions

How is a fractional CTO different from a consultant? +
A consultant diagnoses problems, writes recommendations, and leaves. They are paid for their opinion, not for whether it gets implemented correctly. A fractional CTO is embedded in your team, accountable for outcomes, and stays long enough to see decisions play out. The distinction is ownership. A consultant leaves with a document. A fractional CTO leaves with your team better equipped to run the business without them.
Do you work with London-based companies specifically? +
We are London-based and most of our fractional CTO work is with UK founders — primarily London but regularly across the South East and remotely throughout the UK. On-site presence matters at least initially, which is why geography plays into how an engagement is structured. For UK clients outside easy London reach, we build in regular travel rather than treating the engagement as purely remote.
How long is a typical engagement? +
Minimum three to six months. Anything shorter is consulting, not fractional leadership. It takes at least three months to understand the landscape, build relationships, and begin meaningful change. Six months is more realistic where technical challenges run deeper. The best engagements end with a clear transition — either graduating to a full-time CTO we have helped you hire, or stepping back to a lighter advisory footprint.
When should we hire a full-time CTO instead? +
Once your engineering team exceeds fifteen to twenty people, or you are operating multiple products with significant regulatory complexity, coordination load exceeds what a two-to-three-day-a-week arrangement can support. Series B and beyond, investors usually expect a full-time CTO on the leadership team. The ideal handover has the fractional CTO defining the role, helping hire the replacement, and supporting the transition for one to two months.

Ready for the right technical conversation?

Tell us where you are, where you are trying to get to, and we will tell you honestly whether fractional leadership is the constraint worth solving.

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