3x founder
Antoni Gmitruk
Cofounder at Stealth Startup
2026Co-founder· Stealth Startup
Founder · since 2024Company
Stealth Startup
Role
Cofounder
current
Stage
—
no public source
Raised
—
no public source
Based
—
Founder / co-founder — the company's markEmployee / research role
Source: LinkedIn work historyProfile coverage5 of 7 · missing posts, contact
Experience
Career
2026Stealth Startup
Co-founderCofounder · 2026 – Present
2026Golf (YC X25)
Engineering · 2026 – Present
- 2025
Golf (YC X25)
Co-founderCofounder & CTO · 2025 – 2026
2024MD Fellowship
Co-founderCofounder · 2024 – Present
2023Revenieers
Sales Automation · 2023 – 2024
2023Doing Good
Product · 2023
Bio
Antoni is the cofounder & CTO @ Golf. Antoni started building at 15 by creating a fully automated 3D printer. He dropped out of university after one semester to keep building full-time. He has previously worked on multiple AI products, including an AI SDR and infrastructure for AI agents. Antoni also started a community for young Polish hackers and scientists.