Matthias Isler · Fractional CTOLet’s talk
Matthias Isler · Fractional CTO
Let’s talk about your business.

Build your business.I own the technical side.

I understand the business,lead the teamand know the technology down to the code.

I make the decisions and carry them through.

Fractional CTO for founders building software and AI ventures.

Let’s talk about your business.
Matthias Isler, Fractional CTO, in Zurich

I’m a serial entrepreneur who has built and scaled four ventures, completed one exit, and spent 20+ years in software, including 12 in CTO roles.

Where does your business need to move forward?

Product Launch

Turn your prototype into production software.

What must change before customers can rely on it?

The prototype demonstrates the idea. The next investment needs to produce software you can sell, operate and keep developing.

Product Launch Read the AI workspace case.

Proof02

Client work · Internal product build

Same delivery scope.One engineer.

I chose an internal build over a proposed agency delivery organisation. Taking technical direction and delivery leadership myself made a smaller team viable.

Read the product-build case.

Same delivery scope

Agency proposals

Including delivery organisation and overhead

CHF 350'000–480'000

Proposal price

Internal build

Same scope, Matthias leading one engineer. AI generated 95% of code; the engineer challenged, reviewed and improved it.

≈ CHF 74'000

Internal engineering salary costs

February–April 2025. Working product delivered; engineering capability retained.

Client work · SaaS turnaround

Engineering staff costs down 42%.Technology-related churn to zero.

At a SaaS startup, I took engineering responsibility off the CEO, rebuilt the team around strong senior engineers and changed how product, engineering, QA and DevOps worked together.

Read the SaaS turnaround.

−42%

Average monthly engineering staff costs

0

Technology-related churn

Constraint

Defects, rework and technology-related customer loss

Decision

Rebuild around exceptional senior engineers

Execution

Product, engineering, QA and DevOps under Matthias’s leadership

Employee-engineer salaries averaged over 3 months before and after. Churn reasons were collected from every departing customer.

Client work · Production-ready AI workspace

A production-ready AI workspace, built around the business.

For a US AI startup, I owned research and platform architecture and led implementation. The challenge was connecting company information so the product could answer questions across the business.

Read the AI workspace case.

Real-time ingestion from hundreds of external sources

Company-owned warehouse

Knowledge and dependency graph

Complex business questions across hundreds of gigabytes of company data

Production-ready MVP, tested and market-validated with real company data.
Matthias Isler concentrating on engineering work at a laptop

My engineering depth also includes personally building and operating AureaTauri’s platform behind CHF 410M in executed trading orders.

Explore the engineering evidence.

Collaboration04

Not a consultant.Not an agency.

I don’t hand over a fancy presentation and leave you to work out the implementation. I join your leadership team, make the technical decisions and remain responsible for implementation through your engineers or development partner.

Fractional means you have a CTO with ongoing responsibility, without hiring one full-time.

Founder

Commercial objectives and business commitments

Matthias

Technical direction, decisions and delivery leadership

Team and partners

Implementation and operating work

Together

Priorities, investment and agreed decision authority

Clear responsibility. Work continues between reviews.

We agree decision authority together. Ongoing leadership and focused assignments are both available.

How we work together. Focused services.
Matthias is easily the best manager I’ve had the pleasure of working with. He’s efficient, effective and responsive.
Ezra Obiwale — Senior Full Stack Developer · Former direct report.

Economics05

Fees follow the responsibility and scope.

CTO mandates start at

CHF 3'500per month

We agree the scope individually. Focused assignments are quoted separately.

Scope and fees. The cost guide.

Partner Choice06

Technical Co-Founder.Available Fractionally.

Matthias Isler in a working session at a meeting table

I’ve made investment decisions with my own ventures at stake, built engineering teams and written the software myself. That combination lets me judge the business case, the people and the technical work together.

If you need a full-time CTO, I’ll tell you. If you already have strong technical leadership, additional developers may be enough.

“I appreciate the straightforward cooperation a lot.”
Miro Hegnauer · CEO and Founder of Konova
Compare working arrangements. Meet Matthias.

Contact07

Let’s talk about your business.

Tell me which decision or blockage you’re facing, what is at stake and when it needs attention. I’ll give you my view. Then we decide whether to work together.

The first conversation is free and takes 30 minutes. You leave with my view on whether I can help and how.

If there is a fit, we agree the scope, responsibility, fee and start date.