Matthias Isler
Fractional CTO
Based in Germany · 20+ years experience
Summary
Fractional CTO, founder and engineer with 20 years in software and 10+ years in CTO roles. I help SaaS and digital ventures build, scale and fix technology.
About
I’ve built and scaled SaaS, marketplace and AI-powered products from early stage through growth and acquisition. My experience includes building engineering teams from scratch, managing seven-figure technology budgets, leading enterprise SaaS platforms used by Fortune 500 customers, and operating production ML systems supporting more than $500M in trading turnover.
I work across technology strategy, software architecture, AI/ML, engineering leadership, hiring, cloud infrastructure, product delivery, technical due diligence and turnaround situations.
My best-fit clients are founder-led technology companies, typically with 5–50 employees, where software is core to the business and senior technical leadership is missing or stretched. Common situations include post-funding scale-up, CTO transitions, underperforming engineering, technical debt, major architecture decisions, AI adoption, or preparing the technology organization for the next stage of growth.
My approach is hands-on, pragmatic and focused on business outcomes.
Skills
Software Architecture, Cloud & Infrastructure, M&A / Due Diligence, Platform Modernisation, Cybersecurity, Engineering Leadership, Vendor Management, DevOps, Governance & Risk, Data & AI
Regions covered
Asia-Pacific, Europe, North America, Africa, South America, Middle East
Industry experience
Government, Fintech, Retail, SaaS, Education, Healthcare
At a glance
Matthias brings hands-on experience across Software Architecture, Cloud & Infrastructure, M&A / Due Diligence, Platform Modernisation, Cybersecurity, Engineering Leadership and 4 other areas. Available for engagements across Asia-Pacific, Europe, North America, Africa, South America, Middle East. Industry experience includes Government, Fintech, Retail, SaaS, Education and 1 more.
How fractional CTO engagements with Matthias work
Matthias works on a fractional basis — typically one to three days a week for an agreed engagement length — so you get senior technical leadership without the cost or commitment of a full-time hire. Engagements commonly include technical due diligence, board reporting, engineering team leadership, technology strategy, architecture reviews, hiring support, and stepping in as interim CTO during a transition.