A fractional CTO is an experienced technology leader who works for your business part time, often a few days a month, alongside other clients. For a non-technical founder, a fractional CTO is often the first option they hear about, but it isn't always the right one. It's one of three ways to get the technical side of your business covered, and which one fits depends on what you need built and when.
The other two are a technical co-founder and a development company. I run a development company, and we don't offer a fractional CTO service, so I'll say plainly where each option fits, including the one we don't sell.
What is a fractional CTO?
A chief technology officer (CTO) owns a company's technical decisions. A fractional CTO does that job for a share of the week. They might set the technical direction, choose the tools your product is built with, review a supplier's work, help you hire developers and answer an investor's technical questions.
What it commits you to. Usually a monthly retainer for a set number of days, or a day rate. Many can be ended with notice. Some also ask for equity.
What it costs, in general terms. You pay for part of a senior person's time, so it costs less than a full-time CTO, but you still pay senior rates for every day you use.
When it fits. You already have a product, a development team or a supplier, and nobody on your side can judge the technical work or plan what comes next.
The risks. Their attention is split across clients, so they won't be there for every decision, and you'll still need people to build.
What a technical co-founder brings
A technical co-founder owns the technology with you, for the long term. They lead the build and make the technical calls, and they share the risk of the business with you.
What it commits you to. Equity, often a significant share, and years of working together. Founders often use vesting, so shares are earned over time.
When it fits. The technology is the business, and you want a partner who's as invested as you are.
The risks. Finding the right person can take months. You give away part of the company, and if the partnership breaks down, untangling shares and code is painful.
What a development company does
A development company builds your product, either as a project with an agreed scope or as a team you pay monthly.
What it commits you to. A fixed scope and milestones on a project, or a notice period on a monthly team. You pay a fee for the work.
When it fits. You know what you need built, or you have a clear idea and need help shaping it into a first version. If you're at that stage, our guide to outsourcing software development covers how to run it well.
The risks. If you can't judge the work, you rely on the company's honesty. And unless you arrange it, nobody on your side owns the long-term technical decisions. Two simple protections help: have the code in a repository you own from day one, and agree milestones you can check.
The three options side by side
| Fractional CTO | Technical co-founder | Development company | |
| What you get | Senior technical direction, part time | A long-term partner who owns the technology | A team that builds the product |
| How you pay | Monthly retainer or day rate | Mainly equity | Fixed project price or monthly fee |
| What you commit | Usually notice only, sometimes equity | Years, and shares | A scope or a notice period |
| Best when | Something exists and needs direction | The technology is the business | You know what you need built |
| Main risk | Advice without builders | Giving away equity to the wrong person | Nobody on your side judging the work |
How to choose for where you are now
Many founders come to me saying "I need a CTO". Often they haven't yet looked at which stage their product is at, and that stage decides whether they need one. If your idea isn't tested yet, hiring a CTO adds unnecessary expense and noise. You'd be paying them monthly, or agreeing on equity, for a product you don't yet know real users will pay for. A CTO leads technology. At this stage you need people who design, build and validate the first version.
So start with your stage:
- You have an idea that isn't tested yet. You probably don't need a CTO. You need the smallest version that proves people want it, built quickly and without a big upfront spend. Our MVP development page explains how we approach that first version.
- The idea is tested and you're building the first real version. A development company does the building. If you can't judge the work, an independent technical review, such as a fractional CTO for a few days, can check it for you.
- The technology is the company, and you want a partner for years. Look for a technical co-founder, and expect the search to take time.
- The product is live and has real traction. Users are sending real feedback, people on your team disagree on what to change, and you can't get to a decision you trust. That's the point where I think a non-technical founder needs a CTO. A fractional CTO can lead until the team is big enough to need a full-time one.
Where Exline Labs fits
We don't offer a fractional CTO service. We offer our own versions of the other two.
Technical co-founder for a new venture. For a founder starting something new, Exline Labs can take the technical co-founder role: product design, development and validation. The terms are agreed per venture. We prefer equity, and otherwise work on a reduced monthly retainer. Each venture gets a dedicated project manager or team lead for the day-to-day work.
Development teams. For founders who know what they need, we build MVPs and provide dedicated developers. The code can live in your own repository and cloud account from day one, and you own it. If you're weighing an outside developer against hiring your own, our comparison of a dedicated developer vs hiring in-house sets out the trade-offs.
I take every discovery call myself.
Questions founders ask about fractional CTOs
How much does a fractional CTO cost?
It depends on how many days a month you need and how senior the person is, and rates vary widely. Most work on a monthly retainer or a day rate. Compare a few quotes for the same number of days, and ask for a fixed number of days a month and a clear list of what they'll deliver, so you can see what you're paying for.
Can a fractional CTO build my product?
Usually not on their own. A fractional CTO sets direction and oversees the work, but most don't write much code. You'll still need developers, either your own or a development company.
Do I need a CTO before I raise investment?
Not always. Many founders worry they aren't technical enough to talk about the product when pitching. If you know why you built it and the problem it solves inside out, I don't think you need that fear. Expect investors to ask who owns the technology and whether the product can grow, and have a clear answer to both.
Not sure which one you need?
If you're weighing these options for your own product, book a call with me. We'll talk through which route fits where you are now.
