A fractional CTO is a senior technology leader who works for your company part time, usually a fixed number of hours or days a week, and owns the technical decisions a full-time CTO would own: architecture, hiring, vendors, security and the roadmap. You pay for a fraction of an executive instead of a salary, benefits and equity. This guide covers what the role is, what it costs in Canada and the US, when a senior engineer is enough, and how to tell a good one from a bad one.
Table of Contents
- What a fractional CTO does (and does not)
- Fractional vs interim vs advisor vs agency CTO
- When you need one
- When a senior engineer is enough
- What it costs
- What the first 30 days look like
- How to evaluate one
- How I work
- FAQ
What a fractional CTO does (and does not)
The job is owning decisions. Someone has to answer “do we rebuild this or patch it”, “is this vendor quote reasonable”, “why did we go down on Tuesday” and “who do we hire next”, and answer with evidence. In a company with no technical executive those questions land on the CEO, who ends up siding with the most confident person in the room. A fractional CTO takes that pile.
In practice the work keeps coming back to the same areas:
- Architecture and infrastructure: what gets built, bought or retired, and keeping the system understandable as the team grows.
- Engineering process: code review, release practice, incident handling, what “done” means.
- Hiring: writing the role, running the technical interview, deciding whether you need a senior engineer or a manager.
- Vendor and agency oversight: reading proposals, checking what was delivered against what was invoiced.
- Investor and customer conversations: technical diligence, security questionnaires, the “how does this scale” question.
Leanware’s overview of the role lists close to the same set, including technical due diligence for investors.
A fractional CTO is not extra development capacity; if features ship slowly and the design is sound, hire engineers. Nor is it a daily people manager, because at 10 to 20 hours a week nobody can run standups, one-on-ones and performance reviews for a team. Raft Labs describes the fit as “recurring decisions without full-time scope”, which is the cleanest test I have seen. If the decisions are not recurring, you want a consultant. If the scope is full time, you want a CTO.
Fractional vs interim vs advisor vs agency CTO
| Fractional CTO | Interim CTO | Technical advisor | Agency CTO | |
|---|---|---|---|---|
| Time | Roughly 5 to 25 hours a week, ongoing | Full time or close to it, fixed term | A few hours a month | Bundled into the development contract |
| Owns decisions | Yes, within agreed decision rights | Yes, fully, until the permanent hire lands | No, gives opinions | Yes, but also for the agency’s own roadmap |
| Accountable for outcomes | Yes | Yes | No | To the agency first, you second |
| Typical trigger | Recurring technical decisions with nobody to own them | The CTO left and a search is under way | A founder wants a sounding board | You outsourced the build |
| Main risk | Scope creep and limited availability | Cost, and the handover gets skipped | Advice with no follow-through | Conflict of interest on every recommendation |
The interim CTO is the one people most often confuse with fractional. Go Fractional defines the interim role as someone who “serves as a temporary executive, bridging the leadership gap while you search for a suitable replacement”. The commitment is high and the end date is known. A fractional engagement is lower intensity and often has no end date at all, which I come back to below.
The agency CTO is the one I would be most careful with. When the company that writes your code also supplies the person who tells you what code to write, every recommendation has a billing line attached. Raft Labs lists checking whether a candidate also sells “development, cloud resale, recruitment, or vendor implementation” as part of vetting. I do not want technical direction from the company I am paying to build the thing.
When you need one
The signals are concrete, and most founders recognise one of them immediately.
An agency built your MVP and you cannot evaluate it. You have a working product, a final invoice and a quote for phase two, and no way to know whether the codebase will survive the next twelve months or whether that quote is fair.
You are about to make your first senior engineering hire. You cannot interview well for a level you have never worked at, and a senior engineer hired on charm sets the standard for everyone hired after them.
Investor technical diligence is coming. A seed or Series A investor with a technical partner will ask about architecture, security, the team and the debt, and wants the answers from someone who can defend them. A deck does not survive that conversation.
An outage you cannot explain. Something went down, the team fixed it, and nobody can tell you in plain language why it happened or whether it will happen again. That usually means nobody owns the whole system, the situation Raft Labs describes as developers building inside their own areas while “nobody owns the system”. Raft Labs puts a related signal first on its list: technical decisions keep reaching the founder, who settles them without enough evidence.
Raft Labs suggests scoring yourself 0 to 2 on five dimensions, with 7 to 10 supporting a fractional CTO conversation and 4 to 6 pointing at a bounded assessment first. I like that middle option more than most people selling this service do. A two-week assessment costs far less than a six-month retainer and often tells you which role you need.
When a senior engineer is enough
A lot of companies that think they need a fractional CTO need a strong senior or staff engineer, and I would rather say so than sell the wrong thing.
If you have a technical co-founder who is right most of the time and just overloaded, hire a senior engineer under them. If the problem is throughput, hire engineers. If nobody runs the team day to day, Raft Labs is right that you want an engineering manager or a VP of Engineering, roles that work with the team every day.
The line I use is about who the person answers to. A Staff engineer owns technical direction inside an engineering organisation that already has an executive above them; they hold architecture across several teams and lead through influence. I wrote about what that hands-on, cross-team leadership looks like in Staff vs Senior Software Engineer. A fractional CTO reports to the CEO and owns the budget, vendor and hiring decisions too. If there is nobody on the technical side for a senior engineer to report to, they end up making executive decisions without the mandate, which is unfair to them and risky for you.
There is also a point where fractional stops working. Leanware’s list is sensible: technology is the core competitive advantage, you are building specialised systems that need daily oversight, or the CTO needs to be a public technical face for enterprise customers or investors. Go Fractional adds a size threshold, suggesting full time once the engineering team is past 20 people. My own rule is simpler: when the fractional person is working four days a week and you still want more, stop pretending and hire.
What it costs
There is no market rate, and anyone who quotes you one without asking about scope is guessing. Raft Labs declines to publish a benchmark, saying “public pricing varies by geography, company stage, scope, and engagement model, so one benchmark would mislead”. The ranges below are what other firms have published, with sources, so you can sanity-check a quote. They are not my rates.
For Canada, Reyem Tech’s 2026 Canadian pricing guide puts hourly rates at $200 to $450 CAD and splits retainers into three tiers:
| Engagement shape (Reyem Tech) | Hours per month | Monthly cost (CAD) |
|---|---|---|
| Advisory | 10 to 20 | $3,000 to $7,000 |
| Hands-on | 20 to 40 | $8,000 to $15,000 |
| Embedded | 40 to 60+ | $15,000 to $25,000 |
The same guide prices one-off work separately, for example an architecture review at $5,000 to $12,000, and puts a full-time Canadian CTO at a $250,000 to $350,000 base with a first-year total of $394,000 to $794,000 or more once benefits, recruiting and equity are counted.
For the US, Leanware quotes $150 to $350 per hour and monthly retainers of $3K to $12K, with their own offer at $4,000 a month for one day a week or $10,000 for three days. Go Fractional gives $10,000 to $25,000 per month for its network. The gap between those two is the point: a retainer that looks expensive next to one source looks cheap next to another, so compare quotes on hours and decision rights, not on the headline figure.
The three shapes in Reyem’s table are roughly how I think about engagements too. Advisory is a weekly call and written reviews of decisions, for a technical co-founder who wants a second opinion with teeth. Hands-on is one or two days a week in the repo and in the hiring loop, which fits the agency-built-MVP and first-senior-hire situations. Embedded is three or more days a week, close to an interim CTO, and should have an end condition attached.
On hourly versus retainer, I prefer hourly for the first month or a bounded audit, then a retainer once both sides know the scope, because hourly billing on an ongoing engagement makes the founder ration questions and the CTO watch the clock. Some fractional CTOs take a small equity stake in lieu of part of the fee; I would pay cash and keep equity for the full-time hire you may make later, since an equity-holding part-timer has an awkward incentive when you ask whether to replace them.
What the first 30 days look like
The first month is diagnosis, and you should distrust anyone who shows up with a roadmap on day one. Raft Labs frames days 1 to 30 as establishing facts and decision rights, ending with a decision log and “owners for architecture, security, delivery, and spending”. That matches how I would run it.
Week one is reading: repository access, cloud bills, the incident history, the agency contract if there is one, whatever passes for a roadmap. Then a one-on-one with every engineer, because the people writing the code already know where the problems are and have usually never been asked.
Week two is writing down what is there: an architecture sketch that fits on one page, a list of risks ranked by how likely each is to cost money in the next quarter, and the systems nobody owns.
Week three is picking the first few decisions, usually one security fix that cannot wait, one process fix that unblocks the team, and one hiring or vendor call the CEO has been putting off.
Week four is the conversation with the CEO: here is the picture, here is the decision log, here is who owns what, and here is what I will and will not decide without you. Agreeing decision rights explicitly is what stops the engagement drifting into “expensive advisor”.
Delivery data helps in this month. I built DeliveryCompass, a tool for engineering managers that reads GitHub pull request history, partly because the first question a CEO asks is some version of “is the team slow or does it just feel slow”, and a few months of merge and review data answer that better than anyone’s opinion, including mine.
How to evaluate one
Most evaluation advice is a list of qualities (Go Fractional’s includes strategic vision, budget management and a record of building teams), all true and all impossible to verify in an interview. The checks below can be.
Ask for two comparable decisions. Raft Labs’s framing is the one I would use: decisions made “under constraints similar to yours”, with the evidence they used, the options they rejected, how the team reacted and what they would change. Someone who has held the role can do this in detail. Someone who has only advised cannot.
Run a paid working session. Give them a small, real problem from your company, pay for half a day, and ask for their assumptions, a decision, the risks and the next steps. You learn more from this than from three reference calls.
Check references on conflict and follow-through: how the person handled disagreement, bad news and a missed commitment, and how the handover went. Everyone is good when things go well.
Ask about conflicts of interest directly. Do they also sell development, cloud resale, recruiting or vendor implementation? That does not disqualify them, but you need it disclosed and you should discount recommendations that route money to them. Verify availability in writing as well: concurrent clients, who covers an incident at 2 a.m., what happens during their holidays.
The red flags I take seriously:
- They cannot explain a past system failure in plain language. If they cannot do it for their own history, they will not do it for yours.
- Every answer in the working session is a rebuild. Rewrites are occasionally right and usually the most expensive option, and someone who reaches for one first has not read enough of your code.
- No exit condition. Raft Labs lists an engagement that becomes indefinite with no handover plan as a failure mode. Decide at the start whether this ends with a full-time hire, a handover to an internal lead, or a step down to advisory.
- Your decision log, architecture records and vendor context live in their tools. Those belong in systems your company owns, so you keep them when the person leaves.
How I work
I do fractional CTO and technical leadership work for small teams in Canada and the US, alongside a full-time role, so I take on a small number of engagements at a time.
I have been CTO twice. At Levpay, a payments company later acquired by Pagsmile, I ran engineering as we grew from a handful of users to more than 100,000 monthly and managed the engineering team through it. Before that I founded Mago (Material Agora) and was its CTO through three funding rounds, while monthly sales went from BRL 200 to 300 thousand to BRL 700 to 800 thousand. I know what it is like to be the person investors ask the technical questions, and to answer for the hiring and vendor decisions afterwards.
The hands-on side is current. I am a Senior Principal Engineer at Questrade working on crypto trading, and before that I was a Staff Engineer at LodgeLink, where I led architecture and engineering standards across pods for a net-new platform built as distributed Go microservices. I have written Go for more than nine years, maintain pREST, an open-source REST API and MCP server for PostgreSQL with close to 4,000 GitHub stars, and organise the Golang Calgary meetup. More on the bio page.
The way I prefer to start is a short paid assessment along the lines of the 30 days above, after which we both decide whether an ongoing retainer makes sense and in what shape. If you want to talk through whether this fits your situation, book a call. If it turns out you need a senior engineer or a consultant instead, I will tell you that.
FAQ
How much does a fractional CTO cost in Canada?
Published Canadian ranges run from about $200 to $450 CAD per hour, with monthly retainers from roughly $3,000 for light advisory work to $25,000 for an embedded engagement of three or more days a week, according to Reyem Tech’s 2026 pricing guide. The same guide puts a full-time Canadian CTO’s base salary at $250,000 to $350,000 before benefits, recruiting and equity. Actual quotes depend on hours, decision rights and how much of the work is in the code versus in meetings.
What is the difference between a fractional CTO and CTO as a service?
In practice they are usually the same thing under a different label. “CTO as a service” is more often used by agencies and consultancies selling the role as a product, sometimes bundled with development work, while “fractional CTO” more often describes an individual working with a few clients. Ask either one who else they bill you for, because a CTO service attached to a development contract has a conflict of interest on every recommendation.
How many hours a week does a fractional CTO work?
Most published ranges fall between 5 and 25 hours a week. Leanware cites 5 to 20 hours depending on the engagement, and Go Fractional cites 10 to 25 hours a week for a minimum of three months. Advisory engagements sit at the low end, hands-on work is typically one to two days a week, and anything past three days starts to look like an interim CTO.
Can a fractional CTO raise funding with me?
They can prepare the technical side of a raise and sit in the diligence meetings, which is where most of the value is. That means an honest architecture and security picture, a credible hiring plan, a tech debt list with a cost attached, and answers that hold up when a technical partner pushes back. They should not be the one pitching the business, and investors will want to know who leads technology after the round closes, so have that answer ready.
When should we hire a full-time CTO instead?
When the role is already full time in everything but name. Signs are that technology is your core competitive advantage, the fractional person is working four days a week and you still want more, the engineering team has grown past the point where weekly presence works, or customers and investors need a permanent technical face. A good fractional CTO will tell you when you have reached that point and help you hire their replacement.