Definition
A fractional CTO is a technology executive who holds the full CTO role for a company, but only part of the week. Some call it a part-time or outsourced CTO.
A fractional CTO is not a consultant or a contractor. They make the decisions, lead the team, and answer for the results, like an in-house CTO. What changes is the volume: a few days a week instead of five, and a fee instead of a salary.
Read the full article: what is a fractional CTO?
Who it’s for
You have developers, but no CTO
The founder makes technical calls without the time to do it well. The longest-serving developer has become the de facto lead. Decisions get made, but no one owns them.
Your engineering organization hasn’t kept up with growth
What worked with 5 developers breaks at 15. Releases slow down, incidents repeat, debt piles up, and no one has the mandate to reorganize.
You’re heading into a milestone that depends on technology
A fundraise, due diligence, an acquisition, a rebuild, international expansion, hiring a future CTO. You need a senior opinion, and someone to stand behind it.
What a fractional CTO does
Technical decisions
- architecture and stack
- build, buy, or stop
- technical priorities tied to business goals
- technical debt: what to pay down now, what can wait
Team
- structure and roles
- hiring, from job description to final interview
- coaching team leads and senior engineers
- preparing a future in-house CTO, hired or promoted
AI transformation
- AI agents in the development cycle: writing, review, testing, documentation
- new practices and guardrails for the engineering team
- AI use cases in other teams: customer support, sales, finance, operations
- an adoption plan built with the teams, modeled on the forward deployed engineer: on site, on your data, judged on real usage
Reliability and operations
- security, backups, access management
- incidents and service continuity
- back-office systems, internal tools, integrations, automation
Governance
- technical counterpart to the CEO, the leadership team, and the board
- technology budget and vendor selection
- answers for investors and acquirers during due diligence
How it works
Cadence. 1 to 3 days a week, on site or remote as needed. The CTO joins the team’s rituals and stays reachable between days on site.
First weeks. An assessment of the architecture, code, team, and risks. You get a written report and a prioritized plan.
Length. A few months to more than a year. The engagement ends when the company can do without it.
Exit. Planned from day one: decisions documented, architecture described, successor hired or trained.
Fractional, interim, or fixed-price?
A fractional CTO fits when the need is ongoing but doesn’t fill a week. If the CTO seat is empty and you need someone close to full-time for a few months, that’s an interim CTO engagement. For a one-off, well-defined need — assessment, AI exploration, POC, MVP — a fixed-price project is enough.
Why Monolithic Lab
25+ years of experience in software development, architecture, and engineering leadership. At MeilleursAgents, first employee turned CTO, Nicolas Mussat built from scratch the technology and the team behind a platform serving 1.8 million visitors a month. At Prose, as cofounder and CTO, he built the personalization and made-to-order manufacturing platform that runs the company.
A CTO who builds, not just manages: Nicolas Mussat drives AI agents himself to prototype, analyze, and build, and passes that practice on to the teams.
One point of contact, independent of any software vendor, integrator, or AI provider: every recommendation serves your company alone.