CTO Consulting
CTO consulting for the decision in front of you
Senior, architecture-first technical advice for a specific decision - not an ongoing role. You bring the question; you leave with a written, execution-ready recommendation.
For founders, CTOs and boards who need a second opinion or an independent technical view before they commit.
- Scoped, not open-ended
- Written recommendations
- Can carry into execution
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Your question
One decision, framed so it can be answered
Analysis
System, team and constraints, architecture first
Options
Realistic alternatives with their trade-offs
Recommendation
Written down, with the reasoning attached
What CTO consulting is
CTO consulting is scoped, decision-focused technical advice from a senior CTO: a single session, a short assessment, or a brief retainer, built around one question rather than an ongoing role.
It is not fractional leadership. A Fractional CTO owns your technology direction on an ongoing basis; CTO consulting answers one question and hands you a written recommendation.
It is not a report you file away. Where useful, the recommendation is written so your own team - or Comtau, in a later engagement - can execute it directly.
Typical questions we help decide
Bring us a decision. This is how it gets answered.
Consulting works best when there is one specific decision to make. These are the questions that come up most, with the format they usually start in and what you walk away with.
Architecture
Rewrite vs refactor
Whether to rebuild a system or evolve it, and what that actually costs.
You may see: “A team split between “start over” and “patch it again”.”
Typical format: Scoped assessment
You receive: Options and trade-off matrix
Monolith vs services
Whether splitting the system solves the real bottleneck, or just moves it.
You may see: “A roadmap that keeps stalling on “the architecture”.”
Typical format: Scoped assessment
You receive: Current-state architecture view
Roadmap vs technical debt
How much debt to pay down now versus keep shipping features.
You may see: “A roadmap that ignores a slowdown everyone can feel.”
Typical format: Advisory session
You receive: Prioritised next-step plan
Build, buy and vendors
Build vs buy
Whether to build a capability in-house or adopt a platform or vendor.
You may see: “A decision that keeps getting deferred because nobody owns it.”
Typical format: Advisory session
You receive: Decision record
Vendor or agency evaluation
A sanity check on an estimate, an architecture, or a delivery plan from a third party.
You may see: “A proposal nobody in the room can properly evaluate.”
Typical format: Scoped assessment
You receive: Risk list with mitigations
Team
First senior technical hires
What roles to hire first, and what “good” looks like for each one.
You may see: “Hiring for a title instead of a gap.”
Typical format: Advisory session
You receive: Prioritised next-step plan
AI and due diligence
AI adoption
Where AI actually fits the product and the team, and where it does not yet.
You may see: “Pressure to “do something with AI” without a technical case.”
Typical format: Scoped assessment
You receive: Options and trade-off matrix
Technical due-diligence prep
What an investor or acquirer will ask, and what your systems will show them.
You may see: “A funding round or sale with the technical story unrehearsed.”
Typical format: Scoped assessment
You receive: Risk list with mitigations
Several of these at once, or one after another? That is what the advisory retainer is for.
Typical starting format. The right one is confirmed on the first call.
Who brings these questions
Non-technical founders and CEOs
Facing a technical decision they cannot fully evaluate alone.
A plain-language translation of the options and their consequences.
CTOs and engineering leads
Confident in the work, but without a senior peer to pressure-test it.
A sparring partner on architecture, organisation and trade-offs.
Boards and investors
Needing an independent read on a company’s technology, outside management.
An objective assessment, not filtered through the team being assessed.
Engagement formats
Three ways to bring us a decision
Every format ends with a written recommendation. What differs is depth and time.
- Light
Advisory session
One focused session on a single decision, followed by a short written summary of the recommendation and its reasoning.
- Time commitment
- One focused session
- You provide
- A short brief on the decision and any relevant documents
- You receive
- A written summary of the recommendation and its reasoning
- Best for
- One decision where the options are already on the table
- How it is scoped
- Per session, agreed up front
- Regular
Scoped assessment
A short, defined piece of work - reviewing a system, a plan or a vendor proposal - ending in a written assessment with options and a recommendation.
- Time commitment
- A short, defined piece of work
- You provide
- Access to the system, plan or proposal, and the people who know it
- You receive
- A written assessment with options and a recommendation
- Best for
- Decisions that need the current system examined first
- How it is scoped
- Fixed scope, agreed before work starts
- Deep
Advisory retainer
Ongoing access to a senior CTO for a series of related decisions over a short period, without becoming an embedded leadership role.
- Time commitment
- Access over a short, agreed period
- You provide
- Context that carries from one decision to the next
- You receive
- A decision record per decision and a running next-step plan
- Best for
- A series of related decisions in quick succession
- How it is scoped
- Time-based, over the agreed period
How an engagement works · what you receive
A decision on paper, not just an opinion in a call
Consulting follows the same architecture-first discipline as every other Comtau engagement - just bounded to a single question. Every step leaves an artefact you keep, whatever you decide to do next.
Illustrative layouts - not client material
Frame
Turn a vague worry into a specific, answerable question.
You bringThe situation and what you are trying to decide
Decision brief
Assess
Examine the system, the team and the constraints, architecture first.
You bringAccess to documentation, systems and the people who know them
Current-state view
Options
Lay out the realistic alternatives and weigh them on their merits.
You bringYour constraints: budget, timing, team
Options and trade-off matrix
Recommend
Commit to a recommendation in writing, with the reasoning attached.
You bringThe people who will act on it
Decision record
- Risk list with mitigations
- Prioritised next-step plan
Hand over(optional)
Optionally, carry the recommendation into execution.
You bringA decision to go ahead
Execution roadmap
Bring us one decision.
Tell us what you are trying to decide. We’ll tell you which format fits, and what it would take to answer it properly.
Direct conversation with a senior CTO/architect. We’ll review your situation and determine the useful next step.
Consulting vs ongoing leadership
When a scoped engagement is enough - and when it isn’t
Consulting is the right amount of engagement for one decision. Some situations need more.
| CTO Consulting | Fractional CTO | CTO as a Service | |
|---|---|---|---|
| Commitment | A session, an assessment, or a short retainer | Ongoing, part-time | Defined by the service scope |
| Accountability for execution | For the recommendation, not its execution | For the technology function over time | For the contracted function, including delivery |
| Typical duration | Days to a few weeks | Ongoing | Ongoing |
| Typical output | A written decision record and next-step plan | Strategy, architecture and delivery leadership | A packaged CTO function, with optional delivery capacity |
| Choose this when | You have one decision and need a senior second opinion | Decisions keep coming and nobody owns the whole picture | You need a full CTO function, not just a decision answered |
| Learn about Fractional CTO | Learn about CTO as a Service |
CTO Consulting
- Commitment
- A session, an assessment, or a short retainer
- Accountability for execution
- For the recommendation, not its execution
- Typical duration
- Days to a few weeks
- Typical output
- A written decision record and next-step plan
- Choose this when
- You have one decision and need a senior second opinion
Fractional CTO
- Commitment
- Ongoing, part-time
- Accountability for execution
- For the technology function over time
- Typical duration
- Ongoing
- Typical output
- Strategy, architecture and delivery leadership
- Choose this when
- Decisions keep coming and nobody owns the whole picture
CTO as a Service
- Commitment
- Defined by the service scope
- Accountability for execution
- For the contracted function, including delivery
- Typical duration
- Ongoing
- Typical output
- A packaged CTO function, with optional delivery capacity
- Choose this when
- You need a full CTO function, not just a decision answered
Signals it is time to escalate
- The decisions keep coming, one after another, with no end in sight.
- Nobody is accountable for turning the recommendation into execution.
- The next question depends on context from the last one, and re-explaining it each time is costing you time.
Ready for ongoing ownership? Learn about Fractional CTO.
FAQ
CTO consulting questions
How is CTO consulting priced?
By scope, not by the hour in isolation: a single session, a fixed-scope assessment, or a short retainer, agreed before the work starts. There is no standing rate card until scope is defined.
How fast can we start?
Faster than an ongoing engagement, since the scope is narrow. Tell us the decision you’re facing and we’ll confirm the right format and timing.
Do you work with non-technical founders?
Yes - this is one of the most common reasons to bring in scoped consulting. Recommendations are written in plain language, not just architecture notation.
Can you help implement the recommendation?
If you want that, yes - a recommendation can carry directly into execution through Fractional CTO or CTO as a Service, depending on the shape of the work. Consulting itself stays scoped to the decision.
What information do you need beforehand?
It depends on the decision, but usually: a short description of the situation, access to relevant documentation or systems, and the people who can answer questions about how things actually work today.
Is the engagement confidential?
Yes. Confidentiality is standard, and a mutual NDA can be put in place before any material is shared.
Consultant vs advisor vs fractional CTO - what’s the difference?
“CTO consulting” and “advisor” both describe scoped, decision-based help; on this site, use this page. A Fractional CTO takes ongoing ownership of your technology direction rather than answering one question. If you’re a founder looking for ongoing guidance rather than a single decision, see technical advisor for startups.
Bring us the decision you’re stuck on
Describe the situation. We’ll tell you plainly whether scoped consulting is the right format - or whether you need something more.
Direct conversation with a senior CTO/architect. We’ll review your situation and determine the useful next step.
What happens next
- 01You describe the decision
- 02We confirm the right format and scope
- 03We agree the engagement and get to work
Talk to a senior CTO/architect
Book a call