You don't need a full-time CTO. You need a fractional one.

What a fractional CTO does for a startup

A fractional CTO is a senior technical leader you hire part-time instead of paying a full-time executive salary. Same job description: own the architecture, choose the stack, keep the roadmap honest, and make sure the code being written today does not become the thing that stops you shipping next year. The difference is that you buy the five or six decisions a month that genuinely matter, rather than forty hours a week of someone sitting in meetings.

For most startups this is the right shape between roughly seed and Series A. Before that, you usually need someone to build the thing, not run a department. After it, you need a full-time hire with equity who can grow a team. In between, a startup fractional CTO covers the gap where the technical decisions are permanent but the payroll for a $200K executive is not yet defensible.

It works in two shapes. A weekly retainer, where I hold a block of hours and act as your technical lead on a steady cadence. Or a fixed-scope project, where the question is specific: audit this codebase, assess this developer, design this architecture. Both start with 5 free hours of real work so you can judge the output before you commit to anything.

Why non-technical founders need one first

If you cannot read the code, you cannot tell whether your developer is doing well. That is the actual problem, and it is not solved by hiring harder. A fractional CTO for non-technical founders exists to close that gap: to sit on your side of the table and tell you, in plain language, whether the work you are paying for is good.

Day to day that means translation in both directions. You describe a business goal, and I turn it into an architecture decision, a build sequence, and a hiring plan. Your developer sends you a technical objection, and I tell you whether it is a real constraint or a preference dressed up as one. When you are quoted six weeks for something, I tell you whether six weeks is fair.

It also means hiring. Most founders I meet have already made one expensive hire before we speak, usually because they had no way to evaluate the candidate. I write the specs, run the technical interviews, and review the take-home work. And because I still write production code every week rather than only advising, I can check the work as it lands. That distinction matters more than it sounds: most fractional CTOs stopped coding years ago.

What a part-time CTO for startups actually costs and covers

A part-time CTO for startups usually runs between 5 and 30 hours a week, and the honest answer is that most early-stage founders need less than they expect. At 5 hours a week you get a weekly strategy call, architecture and code review, and async access when something is on fire. At 20 or more I am effectively embedded with your team and shipping alongside them.

The rate is $40/hr whether the hour is spent on strategy or in the codebase, so a 5-hour week is around $800 a month and a 20-hour week around $3,200. There is no separate advisory rate, because splitting the two is how founders end up paying a premium for a document instead of a decision.

What I own versus advise is worth agreeing upfront. I own the architecture, the technical standards, and the final call on stack decisions. I advise on product sequencing and hiring, where you make the call and I make sure you are making it with accurate information. I do not own your deadlines, because a CTO who commits your team to dates they did not agree to is not helping you.

Cadence is remote-first and predictable: one call a week, async in Slack the rest of the time, same-day responses in US business hours. I take on a small number of fractional clients at a time, which is the only way part-time attention stays worth paying for.

Fractional CTO for SaaS: the decisions that get expensive

A fractional CTO for SaaS is a narrower job than general technical advice, because the mistakes are predictable. Multi-tenancy decided late, billing bolted onto a data model that cannot express plan changes, no tenant isolation on the auth layer, usage metering added after the pricing page went live. Each of these is cheap in month one and expensive in month twelve, and every one of them is an architecture decision rather than a coding problem.

So the stack advice is deliberately boring. Postgres before anything exotic, a monolith until you can name the reason it must be split, managed infrastructure until scale genuinely justifies running your own. Boring choices are what let a small team ship features instead of maintaining a platform.

The newer failure mode is AI-generated code, and it is the reason a lot of founders find me. Modern tools will produce something that demos beautifully and hides real problems: no tests, unenforced permissions, secrets in the client bundle, an auth flow that works only for the happy path. It is not that the code is bad. It is that nobody senior read it before it became the foundation. Reviewing that before it hardens is some of the highest-value work I do.

If you want to see what this produces rather than read about it, the case studies cover real products shipped under my technical lead, including what broke and what I would decide differently.