26.10.2026 aktualisiert
Premiumkunde
100 % verfügbarFractional CTO | Co-Founder | Full-Stack Developer
Wattenwil, Schweiz
Wattenwil +50 km
IT Specialist for Application Development (Fachinformatiker Anwendungsentwicklung)Über mich
Ich bin Jeroen Alfes, Fractional CTO aus der Schweiz. Seit 20 Jahren baue ich Software, habe mehrere Startups mitgegründet und Apps mit 25 Millionen Downloads verantwortet. Ich übernehme Ihre technische Führung, genau so viel, wie Sie brauchen.
Skills
Ui-DesignSoftware Architecture
Full-Stack Development
20 years of full-stack development experience covering backend technologies such as C#/.NET, Node.js, TypeScript, PHP/Laravel, Java and REST APIs, as well as frontend frameworks including React, Next.js, Svelte/SvelteKit, JavaScript, Tailwind CSS and shadcn/ui.
Mobile App Development
Development of native and cross-platform mobile applications for iOS, Android and Huawei AppGallery using Swift, Objective-C, Kotlin and Java, with 25M+ app downloads across own products.
Cloud & DevOps
Hands-on experience with cloud infrastructure and DevOps practices using AWS, Hetzner, Docker, Coolify and CI/CD pipelines, including server administration, monitoring and EU hosting.
Database Management
Proficiency in relational and non-relational databases including PostgreSQL, MySQL, MariaDB, MSSQL/T-SQL and MongoDB.
AI & Automation
Integration and application of AI tools and automation workflows using OpenAI, Claude, n8n, Puppeteer and custom workflow automation solutions.
Technical Leadership & Architecture
Technology strategy, roadmap planning, architecture and stack decisions for startups and SMBs, including leading development teams of 5-20 people and external vendors.
SaaS Product Development
End-to-end ownership of SaaS products from architecture to operations, including white-label solutions, API integrations, single sign-on and GDPR/Swiss FADP compliance.
Agile Methods & Product Ownership
Application of Scrum, product ownership principles and technical leadership methodologies in software development projects.
20 years of full-stack development experience covering backend technologies such as C#/.NET, Node.js, TypeScript, PHP/Laravel, Java and REST APIs, as well as frontend frameworks including React, Next.js, Svelte/SvelteKit, JavaScript, Tailwind CSS and shadcn/ui.
Mobile App Development
Development of native and cross-platform mobile applications for iOS, Android and Huawei AppGallery using Swift, Objective-C, Kotlin and Java, with 25M+ app downloads across own products.
Cloud & DevOps
Hands-on experience with cloud infrastructure and DevOps practices using AWS, Hetzner, Docker, Coolify and CI/CD pipelines, including server administration, monitoring and EU hosting.
Database Management
Proficiency in relational and non-relational databases including PostgreSQL, MySQL, MariaDB, MSSQL/T-SQL and MongoDB.
AI & Automation
Integration and application of AI tools and automation workflows using OpenAI, Claude, n8n, Puppeteer and custom workflow automation solutions.
Technical Leadership & Architecture
Technology strategy, roadmap planning, architecture and stack decisions for startups and SMBs, including leading development teams of 5-20 people and external vendors.
SaaS Product Development
End-to-end ownership of SaaS products from architecture to operations, including white-label solutions, API integrations, single sign-on and GDPR/Swiss FADP compliance.
Agile Methods & Product Ownership
Application of Scrum, product ownership principles and technical leadership methodologies in software development projects.
Erfahrung
Berufserfahrungmehr als 10 Jahre
Freelancer seit2009
Sprachen
DeutschMutterspracheEnglischverhandlungssicher
Projekthistorie
Part-time technology leadership for startups and SMBs in the DACH region. Responsibilities include technology strategy, roadmap, architecture and stack decisions, leading development teams and external vendors, reporting to management and investors, tech audits and due diligence, AI assessments and AI integration. Engagements include a review management platform and an e-commerce platform.
Dating app matching on interests and values, available for iOS, Android and web. Features include real-time messaging, nearby search, reporting and blocking.
Health apps aktiBMI, aktiWeight and aktiBody for iOS, Android and Huawei AppGallery. aktiBMI has 10M+ downloads and 4.6 stars from 86,000+ ratings. Operations for 500,000+ users with a premium version offering extended features.