Definition
An interim CTO — also called a transitional CTO — is a technology executive hired for a set period to fill an empty or failing CTO seat, between two permanent CTOs or through a critical period.
The engagement has a start, an end, and a goal: steady the team, make the calls that can’t wait, and hand the successor a team and systems in good order.
It takes more time than a fractional engagement, often close to full-time at the start. It’s also shorter: a few months, long enough to hire and onboard the next CTO.
Read the full article: what is an interim CTO?
When you need one
Your CTO is leaving
A resignation, a negotiated exit, a disagreement with leadership. The team loses its anchor, pending decisions stall, and hiring a successor will take months.
The role exists, but it isn’t working
The founding CTO no longer matches the company’s size, the team is disengaging, the relationship with leadership has broken down. Someone needs to hold the role while the company decides what comes next.
An event demands technical leadership now
An acquisition, a merger, due diligence, a major incident, a critical migration, a change in strategy. It can’t wait for a hiring process to finish.
How the engagement runs
Take control
- meet every member of the team
- inventory projects in flight, risks, and commitments made
- secure access, backups, and critical vendors
- unblock stalled decisions
Steady the team and lead
- restore clear priorities and a delivery rhythm
- start the AI transformation: equip the engineering team with agents, launch the first use cases in other teams, set an adoption plan built with them
- address the risks identified
- keep the team: an empty CTO seat often triggers more departures
- tell leadership, and the board if needed, where the technology really stands
Hand over
- define the successor’s profile with leadership, including their ability to carry the AI transformation forward
- take part in hiring
- support the new CTO’s first weeks
- document decisions, architecture, and open projects
What you get
- technical leadership with no gap
- a candid written assessment you can hire against
- a better-targeted search, because the need was measured from the inside
- a successor who starts with a clear picture
- an AI transformation underway instead of postponed: a transition is often the right moment to change how the team works
Why Monolithic Lab
Taking over a role midstream means understanding systems and teams someone else built, fast. 25+ years inside growing companies — including MeilleursAgents, from its first days to market leader, and Prose, cofounded in 2017 — teach you to spot quickly where the risk is, who owns what, and what can wait.
An interim CTO who builds, not just manages: Nicolas Mussat drives AI agents himself to analyze code he didn’t write, prototype, and build, which speeds up taking control.
Monolithic Lab has no interest in stretching out an interim engagement. The goal is a successor in place and a team that no longer needs outside help.