Technical leadership, when it counts.
External technical leadership on a part-time basis for SaaS products and web applications, known as a fractional CTO: direction, architecture, and responsibility in the decisive phase, without a permanent hire.
Not extra hands. The person who owns technical decisions and keeps the product on course.
When no one owns the technical direction.
Often the person who sets technical direction and carries responsibility is missing in-house. It shows in patterns that get more expensive the longer they run:
- architecture decisions get postponed or made in passing
- the product grows, but no one owns the technical direction
- a full-time CTO would be too much for the current phase, yet the gap remains
- founders or management decide technically without an experienced counter-voice
What I take on as technical leadership.
Part-time and matched to the phase, not full-time, and unlike pure consulting, with a hand on the product:
- technical direction and architecture decisions that carry later
- responsibility for the decisions that have to be right early
- the critical parts built myself, not just commissioned: decision and implementation in one hand
- AI as leverage with judgment: speed from tools, direction from experience
- sparring for founders and management as an equal
- a bridge between product goals and development
Interim CTO, fractional CTO, or CTO as a service?
The terms point to similar roles, but not the same model. The difference is less about the title than about who carries the technical responsibility, and for how long.
Interim CTO
Usually bridges a vacant position full-time, for a limited period, until a permanent hire is in place. It fits when an existing leadership gap has to be closed at short notice, not when the role is only just emerging.
Fractional CTO
Works part-time and over a longer span, focused on the phases where technical direction counts. Responsibility stays with one person throughout, without a full-time position having to be justified. This is the model Windschatten IT is built for.
CTO as a service
Describes the same work more as an ongoing service model, often with a team in the background. The term shifts the focus from the person to the service; here the technical responsibility stays with one hand on the product, not with an interchangeable service layer.
Which term gets used matters less. What counts is that someone owns the technical direction, instead of spreading it across roles.
Assessment first. Then leadership.
It begins with an assessment of the project: how important is it, where are the risks, which decisions have to be right now? From that follows how much technical leadership your phase really needs. How I work in general is covered in how I work.
What changes.
- clear technical direction instead of decisions made in passing
- good decisions early instead of expensive corrections later
- a product that actually carries after go-live
- speed, without gambling away durability
Technical leadership for a multi-tenant platform
For roughly four years the responsible point for architecture and technical leadership of a platform that today carries several corporate brands.
What technical leadership on a part-time basis means.
What is a fractional CTO?
A fractional CTO is experienced technical leadership on a part-time basis: someone who takes on direction, architecture, and technical responsibility for a product without being a permanent hire. It makes sense when a project needs this leadership but a full-time position is not (yet) justified.
When is external technical leadership worth more than a permanent hire?
When the technical direction has to be right now, but a permanent CTO role would mean months of searching or would simply be too much for the current phase. Technical leadership on a part-time basis brings the decision-making power immediately, focused on the phase where it counts, and without long-term fixed costs.
How does this differ from a freelance developer?
A developer delivers implementation. Technical leadership owns direction and architecture: which decisions have to be right early, where the risks are, how the product stays durable. It is about judgment and responsibility, not extra hands.
How is the collaboration set up over time?
Part-time and matched to the phase, not full-time. It begins with an assessment of the project; from that follows how much technical leadership it actually needs.
Do you only advise, or do you build along yourself?
Both, and that is exactly the difference. I own the technical direction and build the critical parts myself instead of just commissioning them. Especially in an important phase, durability comes from where decision and implementation sit in one hand.
How do you use AI in development?
As leverage, not as an end in itself. AI brings speed; the direction comes from judgment and experience. I use it productively where it carries, and own the decisions it cannot make.
Interim CTO or fractional CTO, which fits my project?
An interim CTO usually bridges a vacant position full-time for a limited period. A fractional CTO works part-time and over a longer span, focused on the phases where technical direction counts. Windschatten IT is built for the part-time model: as much technical leadership as your phase really needs, without full-time fixed costs.
Do you also offer technical due diligence?
Yes. Before an investment, acquisition, or product decision, I review an existing code and architecture state for what carries and where the risks are: technical debt, durability, dependencies, realistic effort. A technical due diligence for software delivers the basis to decide the next phase with a clear picture.
What does an external CTO cost in Germany?
It depends on the model and the scope: part-time technical leadership over several months costs differently than a short, intense assessment phase. Instead of a flat day rate, it starts with the question of how much technical leadership your phase really needs. From that follows a reliable frame, measured by the responsibility taken on rather than by billed hours.
Is your project missing technical leadership?
A first conversation clarifies how much technical leadership your current phase really needs.