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. Part of this work involves evaluating technology vendors to ensure you are not overpaying or locked into the wrong platform.
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. Understanding the difference between a fractional CTO and an IT consultant helps set the right expectations.
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.