Sergii Domanitskyi
Based in United States · 20+ years experience
Summary
Fractional CTO | I bring foresight, direction, and delivery to early-stage startups | Tell me what you’re building - I’ll tell you if it’s worth
About
I’ve seen many product ideas that should never have started.
When you're a visionary, it doesn’t matter whether you’re a seasoned entrepreneur or a first-time founder, you all share the same expectation. You count on rapidly transforming ideas into working solutions.
“Will it work?” Only someone who’s been there knows the answer.
And what have I seen and built?
I bring ~20 years of experience turning raw ideas into scalable, investor-ready tech products, built 50+ MVPs and prototypes, led cross-functional teams in the U.S., Europe, and Asia (up to 35 engineers), launched products under extreme time and budget constraints, and supported founders in investor negotiations – helping raise over $20M in funding.
But does any of this matter if you don’t get the answer to the question that truly matters, “How can I build the right tech team and MVP without wasting time, money, or my market opportunity”?
That’s exactly what my hands-on experience is meant to answer.
When I joined a founder building a motorcycle-based mobility startup in Turkey, they had only a raw idea and a clear pain point: in major cities, traffic jams made even short trips unbearably long – often over 4 hours during rush hour.
What I did: I helped shape the concept into an Uber-like app for passengers, packages, and food delivery, and led the design and development of the entire platform.
Result: 10-15K daily interactions within 1.5 years.
When I joined a service company working with U.S. clients and teams across Asia and Eastern Europe, they had delivery delays, poor coordination across time zones, and little structure in team operations.
What I did: I led a team of 20+ across Indonesia, Ukraine, and the U.S., implemented clear task distribution and streamlined communication, while also managing key client relationships.
Result: 30+ contracts closed and major improvements in delivery speed and team efficiency.
When I joined a founder exploring how to disrupt last-mile delivery in crowded urban markets, they faced a saturated courier space with no viable path to significantly cut delivery times or costs.
What I did: I helped design and build a distributed delivery system for e-commerce, enabling stores to deliver goods directly from local points instead of centralized warehouses.
Result: 1,000+ same-day deliveries within months, 50% cost reduction, and fulfillment in just a few hours.
And it’s not magic. It’s focus, decisions, and knowing exactly what not to build - so what you do build works from day one.
Skills
Software Architecture, Cloud & Infrastructure, Engineering Leadership, Data & AI
Regions covered
Industry experience
Not-for-profit, Fintech, Retail, SaaS, Education, Healthcare
At a glance
Sergii brings hands-on experience across Software Architecture, Cloud & Infrastructure, Engineering Leadership, Data & AI. Available for engagements across Europe, North America, Middle East. Industry experience includes Not-for-profit, Fintech, Retail, SaaS, Education and 1 more.
How fractional CTO engagements with Sergii work
Sergii 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.