Market Validation Mistakes: Lessons from Starting 4 Companies

📅 Date: 27.04.2026

🎙️ Speaker: Stefan Vartolomeev – software developer with over 20 years of experience and serial entrepreneur, Bulgaria

🔐 About the event:

This event is part of the user group IT Entrepreneurship.

Program:

Market validation is the most important step before starting a business. Despite the experience and awareness I had, looking back I see how much more I could have done before launching each of the companies I was involved in.

Some lessons can only be learned retrospectively, and that's exactly what we will do.

I will share stories about starting 4 companies, what I would change in my approach, what I underestimated, and what I learned from the processes.

>>> Q&A session

The event is free but requires mandatory pre-registration.

User Group: IT Entrepreneurship. We organize monthly events related to IT Entrepreneurship topics. To stay updated, please subscribe to the group.

Organizer: DEV.BG – a specialized job board for IT vacancies.

Looking for a job as an IT professional? Check out the open positions here.

When: April 27, 2026, at 19:30

We look forward to seeing you!

About the Speaker:

Stefan is a software developer with over 20 years of experience and a serial entrepreneur with a proven contribution to the Bulgarian tech scene. He is the founder of several successful companies and in the last decade has organized over 60 tech conferences nationwide, creating spaces for innovation, knowledge sharing, and collaboration.

His latest venture, Access Drum, is a social enterprise aiming to make the digital world more accessible. By employing people with disabilities as testers, the company provides authentic feedback on the accessibility of websites, online stores, and other software solutions. Stefan not only helps businesses comply with the European Accessibility Act but also creates real employment opportunities and social inclusion.

SPONSORS:

SuperHosting.BG

https://dev.bg/company/superhosting-bg/