I'm Jeroen Alfes, a fractional CTO based in Switzerland. I have been building software for 20 years, co-founded several startups and was responsible for apps with 25 million downloads. I take on your technical leadership, exactly as much as you need.
Track record
Projects
Products I built myself as CTO and co-founder and am responsible for, from the first line of code to operations.
CTO
All-in-one SaaS platform for learning management, seminar administration and social learning. For companies, associations, public authorities and education providers.
Co-founder & CTO
BMI calculator and weight diary as an app for iOS, Android and Huawei. With body metrics tracking and PDF reports for the doctor.
Co-founder & CTO
Digital workspace for small teams: tasks, projects, time tracking, chat and client management in one place. As a web app and for iOS and Android.
Co-founder & CTO
My own content management system, built from scratch. It runs more than 200 websites that I look after technically.
I do not name these clients. I am happy to tell you more in a conversation.
CTO
Concept and development of the platform, ongoing technical support and an audit of architecture, code and operations.
CTO
Technical responsibility for development and ongoing support of the platform, complemented by a technical audit.
Development & integration
Corporate website for an industrial company, connected via API to the company's internal systems.
Services
Which technology supports your business model? I turn goals into a prioritised roadmap with budget, risks and milestones.
Scalable, maintainable and affordable. Together we decide what to build, what to buy and what to leave out on purpose.
From the first version to the app in the store. Hands-on when it counts: web, mobile and backend.
Defining roles, hiring and onboarding developers, setting up processes. So your team works without me, too.
Reviewing quotes, writing requirements, signing off quality. I sit on your side of the table.
Where does AI bring real value to product and engineering, and where only cost? Assessed soberly and integrated properly.
An independent view of code, architecture and team, for investors, acquisitions or your own assessment.
Technology
The right technology is the one that fits your business, your team and your budget. These are the technologies I have built with and led teams in.
AI & fractional CTO
Partly. AI writes code in seconds. But it does not decide what should be built, it carries no responsibility and it does not know your business.
> Build me an app for 100,000 users with payments.
Review by the CTO
→ Working is not the same as ready for the market.
AI makes good teams faster. A fractional CTO makes sure they get faster in the right direction.
Discuss your AI projectComparison
A full-time CTO is the right choice when technology needs leadership every day. Until then, many companies pay for capacity they are not yet using.
50–70%
lower cost per year at one day per week
| Criterion | Full-time CTO | Fractional CTO |
|---|---|---|
| Cost per year | Full-time CTOapprox. CHF 205,000–270,000Salary including employer contributions, excluding bonus and equity | Fractional CTOapprox. CHF 60,000–130,000at one day per week and typical market day rates |
| Additional costs | Full-time CTOSocial contributions, holidays, absences, workplace, training | Fractional CTONone. You only pay for days worked. |
| Time to start | Full-time CTOSeveral months of searching, often with a recruitment fee | Fractional CTODays to a few weeks |
| Commitment | Full-time CTOPermanent contract with a notice period of several months | Fractional CTOScope as needed, adjustable |
| Risk of a wrong hire | Full-time CTOHigh: cost of search, onboarding and separation | Fractional CTOLow: you can start with a clearly scoped audit |
| Experience | Full-time CTOThe view from one company | Fractional CTOMy experience from several startups and many client projects |
| Presence | Full-time CTOFull-time in the company | Fractional CTOFixed days per week by arrangement |
Example calculation. CTO salary in Switzerland CHF 186,000–228,000 (Robert Half Salary Guide 2026), employer contributions 10–18%. Fractional CTO: typical market day rates of CHF 1,300–2,800 at 46 working weeks.
To be honest: once your tech team grows significantly, or technology is your core product and needs leadership every day, a full-time CTO is worth it. I am happy to help you find and onboard the right person.
Clarify what you needEngagements
From a one-off check to a long-term partnership.
Only 2 engagements availableAn honest assessment of product, code, team and costs, with concrete recommendations and a roadmap you can act on.
Fixed price, agreed up front
EnquireWhere does AI bring real value to your company, and where only cost? I review processes, data and existing tools and show what is worth doing.
Fixed price, agreed up front
EnquireI take on technical leadership part-time, with fixed days, clear responsibility and a seat at the management table.
from CHF 7,500 per month1 day per week
EnquireA sparring partner for management, the board or investors. No operational responsibility, but an experienced view on the big technology decisions.
Price on request
EnquireFor ventures I believe in: I join as technical partner and build the product with you from the ground up.
Individual
EnquireProcess
Free and without obligation. You describe the situation, I ask questions. Afterwards we both know whether it is a fit.
I get a solid overview of product, code, team and goals.
You receive a concrete plan with scope, goals and a transparent offer.
I take responsibility, deliver measurably and plan the handover from day one.
About · Jeroen Alfes
I don't just advise. I build.
I'm Jeroen. I have been building software for 20 years, from the first commit to running products with millions of users. I have founded companies, written the code and led the teams myself. Today I bring that experience as a fractional CTO to companies that need technical leadership but not (yet) a full-time CTO.
I'm Jeroen Alfes, a fractional CTO based in Switzerland and founder of Alfes Productions GmbH. I provide part-time technical leadership for startups and SMEs in the DACH region (Switzerland, Germany, Austria): technology strategy, architecture, product development, team building and the sensible use of AI. I bring 20 years of experience as a full-stack developer, have built several startups as a co-founder, was responsible for apps with a total of 25 million downloads, delivered more than 200 websites and have looked after over 13 software projects with seven-figure monthly revenues.
FAQ
An experienced chief technology officer who works for your company part-time. You get the same strategic and technical leadership as with a full-time CTO, but only to the extent you actually need.
The terms overlap. An interim CTO usually fills a gap full-time, for example after someone has left. A fractional CTO, also called a part-time or external CTO, works with you part-time on an ongoing basis, typically one to two days per week. “CTO as a service” describes the same model as a continuous service. I work as a fractional CTO: part-time, with clear responsibility and for the long run.
Startups without a technical co-founder, SMEs with larger digital projects, and companies whose tech team is growing faster than its structures.
A fractional CTO engagement at one day per week starts at CHF 7,500 per month. The tech audit and the AI check have a fixed price that we agree up front. After the free intro call you receive a transparent offer, with no hidden costs and considerably cheaper than a full-time position.
Both. I work remotely with companies across the DACH region, meaning Switzerland, Germany and Austria. On site I work in the Bern, Thun and Mittelland area, and elsewhere by arrangement.
More than ever. AI speeds up development enormously and belongs in every team today. But it does not decide what should be built, it takes no responsibility for architecture, security and data protection, and it does not lead a team. The more code AI produces, the more you need someone who can judge it and stand behind it.
Yes, when it makes sense. After 20 years of full-stack development I build prototypes, critical components or code reviews myself. My main job, however, is to make sure your team or your vendors build the right way.
If we are both convinced, you receive a concrete proposal with goals, scope and an offer. If not, you still get an honest assessment of your situation.
Intro call
Tell me briefly what it is about. I will get back to you personally. By phone, too, if you like.
Intro call · free · 30 min
No obligation and no sales pressure. Afterwards you know where you stand and what you need.
Only 2 engagements available