What Is a Fractional CTO?
A fractional CTO provides part-time technical leadership. Instead of hiring a full-time executive at $250k-400k/year, you get senior expertise for 10-40 hours per week.
This model works well for:
Pre-funded startups building MVPs
Funded startups without technical co-founders
Companies navigating technical transitions
Teams preparing for due diligence
Week-to-Week Reality
Week 1-2: Assessment
The first phase is understanding your situation:
Review existing code and architecture
Meet with team members individually
Understand business goals and constraints
Identify immediate risks and opportunities
Deliverable: Assessment document with prioritized recommendations.
Ongoing: Rhythm
A typical week includes:
Monday: Planning and priority alignment
Review week's goals with founder/CEO
Adjust sprint priorities if needed
Address any blockers from last week
Tuesday-Thursday: Deep work
Architecture decisions and documentation
Code review of critical changes
Technical interviews for hiring
Vendor evaluations
Security and infrastructure review
Friday: Communication
Team standup or retro
Stakeholder updates
Documentation and knowledge sharing
Common Activities
Strategic:
Technology roadmap creation
Build vs buy decisions
Technical due diligence (for fundraising)
Board/investor technical communication
Tactical:
Architecture design and review
Code review on critical paths
On-call escalation for major incidents
Team mentoring and coaching
Hiring:
Job description creation
Resume screening
Technical interviews
Offer negotiation guidance
What You Don't Get
Fractional CTOs aren't:
Full-time coders (though many write code)
IT support
Project managers (though they interface with them)
Magic solutions to cultural problems
Making It Work
Communication
Establish clear channels:
Slack for async questions
Weekly 1:1 with founder
Monthly strategy review
Documented decisions in shared space
Scope
Define what's in and out:
Which decisions need CTO input?
What can the team decide autonomously?
When to escalate vs proceed?
Metrics
Track the impact:
Team velocity changes
Technical debt reduction
Hiring success rate
Incident frequency
When to Upgrade
Consider full-time CTO when:
You need 40+ hours/week consistently
Equity compensation makes sense
Leadership presence matters daily
You've found the right person
Many companies use fractional CTOs for 6-18 months before hiring full-time. The fractional CTO often helps with the search and transition.