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What Does a Fractional CTO Actually Do?
“Fractional CTO” has become a catch-all — people use it for almost any part-time senior technology leader. And honestly, if what you need is someone to get their arms around your technology quickly and take ownership, the exact title matters less than finding the right person. But the roles do differ, so this article explains it from a purist’s perspective: what a fractional CTO actually does when you draw the lines properly.
A fractional CTO owns your technology direction part-time: strategy and roadmap, the expensive architecture and supplier calls, technical credibility with investors and the board, and leadership of your engineers. What they don’t do is write your production code — the value is in the judgement and the decisions, not the lines of code.
A good fractional CTO is a whole owner for part of the week, not a fraction of a person. Here’s where the time goes.
1. Technical strategy and roadmap
They decide where engineering effort goes over the next few quarters and tie those decisions back to the business plan — so the team builds what moves the business, not what’s merely interesting.
2. Architecture and supplier decisions
The expensive, hard-to-reverse calls: which platform, build versus buy, how much technical debt is acceptable, which suppliers and licences to commit to. Getting these right the first time is where a fractional CTO earns their fee.
3. Investor and board credibility
They represent the technology in the room — answering technical questions during fundraising and due diligence, and giving the board a straight read on technology risk. Delivered, in our case, by Barry Weaver, who has raised over £200m, from EIS and VC through to large private equity.
4. Team leadership and oversight
They mentor senior engineers, review key decisions, and catch architectural mistakes while they’re still cheap to fix — whether your team is in-house, outsourced, or a mix.
What a fractional CTO does not do
A fractional CTO doesn’t replace hands-on engineering headcount. Someone still writes the code, runs the tests and ships the features; the fractional CTO makes sure the right things get built, well, the first time.
How the title shifts with the need
The same person often covers the blend of CTO (product and engineering), CIO (systems, data, internal IT) and IT Director (operations). The title follows the problem — see CTO vs CIO vs IT Director.
Frequently asked questions
What does a fractional CTO do day to day?
Sets technical strategy and roadmap, makes architecture and supplier decisions, represents technology to investors and the board, and mentors and oversees the engineering team — part-time, on a two-to-four-days-a-month basis.
Does a fractional CTO write code?
No — but that doesn’t mean nothing gets produced. The output is decisions and direction: the roadmap, the architecture and supplier calls, the straight read on risk. Engineers still write the code; the fractional CTO makes sure they build the right things, well.
How many days a month does that take?
Typically two to four days a month for an advisory/oversight role, scaling up around key periods like a raise or a launch.
How is it different from a consultant?
A consultant usually delivers a report and leaves. A fractional CTO takes ongoing ownership of the technology decisions and is accountable for them over time.
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