Some of the projects and companies I am or was involved in, in random order:

1. The Risk Protocol - CTO, DeFi startup focused on tackling volatility risk in crypto assets
2. JHELY Real-Estate Portal - Co-Founder, PropTech portal focused on LATAM markets
3. SkyTrade - Engineering, a marketplace for low-altitude air-space and air rights
4. Fr0ntierX - CTO, NFT-focused software house
5. Espeo Blockchain - Head of Blockchain, FinTech software house
6. Intelligent Payments (acquired by EVO Payments) - Technical Leader, Payments Gateway focused on serving big gambling and e-commerce clients
7. CloseCross - CTO, DeFi, Financial Derivatives Trading Platform, First MiFID2 regulated crypto company (license obtained in Malta).
8. trade.io - CTO, centralized crypto exchange
9. NaviExpert - Early engineer, mobile navigation system for low-end mobile phones
10. BCC - SAP Tech Consultant
11. Firecrest (acquired by ICON) - Java Engineer, pharma
12. Consileon - Tech Consultant, serving German financial institutions and banks
13. Comarch - Technical Leader, software house, I was involved with insurance processes
14. KillBill - IT Director, a tool to automatically optimize mobile phone bills
15. Wyższa Szkoła Bezpieczeństwa - IT Director, digital marketing consultant
16. InBillo - Blockchain Consultant, debt trading platform
17. MOBILE BOX - Mobile apps engineer
18. O'CHIKARA - developed a desktop app for managing educational school
19. Tontine Trust - Blockchain Consultant, life insurance
20. Invactor - Blockchain Consultant, invoicing/remittance payments platform
21. Estate Protocol - Blockchain Consultant, RWA, fractional real estate investments

Some more details can be found in my CV.