You have heard the pitch: “Get a CTO without the full-time salary.” But what does that actually mean in practice? What happens on the days your fractional CTO is working? And what happens on the days they are not?
I have been working as a fractional CTO for multiple SMEs simultaneously, and the role looks different from what most business owners expect. It is not about writing code all day (although I do that too). It is about making the technology decisions that save — or cost — your business tens of thousands of pounds.
The four pillars of the role
Every fractional CTO engagement is different, but the work clusters around four areas: strategy, architecture, people, and vendors. The balance shifts depending on your business stage, but all four matter.
1. Technology strategy: deciding what to build and what to buy
The most expensive technology mistakes are not bugs. They are building the wrong thing, or buying a £40,000 system when a £4,000 tool does the job. A fractional CTO evaluates your business goals and maps them to technology decisions.
This means reviewing your current stack, identifying gaps, and creating a roadmap that aligns technology spending with business priorities. Not a 50-slide PowerPoint — a living document that your team actually uses.
2. Architecture and code: the technical backbone
When your developers propose a new feature or system, someone needs to evaluate whether the architecture will scale, whether the technology choices are sound, and whether the implementation is production-ready. That is the fractional CTO.
At SelectWise, this is hands-on. I review pull requests, design system architectures, and write production code. If your team built a prototype with AI tools like Cursor or Bolt, I assess whether it is ready for production or needs hardening. Not every fractional CTO codes — but the ones who do bring a different level of credibility with development teams.
3. People: hiring, mentoring, and managing developers
Most SME founders are not qualified to interview developers. They cannot tell a strong engineer from someone who interviews well but ships poorly. A fractional CTO writes job specs, conducts technical interviews, and helps you avoid the £30,000 bad-hire mistake.
Once the team is in place, ongoing mentoring keeps them growing. Code reviews, architecture discussions, and regular one-to-ones turn junior developers into senior contributors — without you hiring a team lead.
4. Vendor management: stopping overspend
SaaS subscriptions, IT support contracts, cloud hosting bills — these accumulate quietly. I have yet to walk into an SME and not find at least £10,000 per year in unnecessary spending. Duplicate tools, oversized licenses, contracts that auto-renewed at inflated rates.
Vendors behave differently when a CTO is in the room. I review contracts, benchmark costs, and negotiate on your behalf. The savings from the first vendor audit often pay for the entire engagement. A technology health check is the fastest way to surface these hidden costs.
What a typical week looks like
On a 4-day-per-month engagement (the most common), a typical month might look like:
Day 1:Leadership meeting, review last sprint’s output, update the technology roadmap, handle any urgent decisions that queued up during the week.
Day 2:Deep technical work — architecture review for a new feature, code reviews, security audit of a proposed integration.
Day 3: Vendor evaluation or contract negotiation. Interview a developer candidate. Review the automation pipeline we are building.
Day 4: Team mentoring session, document key decisions, prepare the board update on technology progress.
Between those days, I am available on Slack for quick decisions. Most questions take 5 minutes to answer but would cost your team 5 days of going down the wrong path.
What a fractional CTO does NOT do
A fractional CTO is not your IT support helpdesk. They do not reset passwords, fix printers, or troubleshoot Wi-Fi. They do not project-manage your development sprints day-to-day (that is a delivery manager or scrum master). And they do not replace your development team — they make your existing team significantly more effective.
Is it right for your business?
If you are spending more than £50,000 per year on technology, have developers (in-house or outsourced) without senior oversight, or are making technology decisions that feel like guesses — a fractional CTO will almost certainly save you more than they cost. Read about the 5 signs your SME needs a fractional CTO or check what it costs in the UK.