Alex Cem Üster

Founder at Custom Rebels - We celebrate creativity and artist unity

📍 Turkey🔄 Updated September 2026💼 3 investments📅 5 years investing🗓 Last invested Aug 2021
VC🌍 Turkey
3
Total investments
3
Early stage
0
Mid stage
0
Late stage
5y
Years active

Portfolio

3 investments · sorted by recency
All investments
Early stage
Mid stage
Late stage
Angel Investor
Aug 2021
Rolling Fund + Syndicate Model with Modest Capital for Early Stage Startup Investors. Invests $20K - $50K in go-to-market stage technology startups. Shareholdings include - Nebyan Doğal, Barty Digital, Barakatech, Enhencer, HoustonBionics, Octovan, Oda Studio, GlaucoT, DatAnchor, Sweephy, Smpl, Scoutli, Postuby, Sensgreen, For Physician, Ecofoni, Handler, Pangea VR, OneNewOne and Sorbil. geometryventure.dev
Angel Investor
Aug 2021
Marmafarm targets to be the leading hydroponic greens producer in Turkey. Products mainly being, lettuce, mint, arugula, baby spinach, dill and parsley.
early stageFarming
Angel Investor
Jul 2021
Aposto is an Istanbul & New York-based independent digital media and technology company dedicated to building a captivating information landscape for tomorrow. We build next-generation digital media brands and community-focused online ventures capturing the zeitgeist of our times.
Experience · 9 entries
All (9)
Investments (3)
Founder (3)
2025
Founder
Oct 2025
At Renuu, we take what the system leaves behind—waste, defective pieces, and end-of-season products—and give them a second life. Every item is carefully redesigned, repaired, and repurposed with a circular mindset, ensuring that nothing ends up as mere waste. Instead of producing new materials, we transform what already exists into durable, functional, and meaningful products, closing the loop between creation, use, and renewal. This process not only reduces environmental impact but also proves that fashion and textiles can thrive within a true circular economy. We collaborate with brands, manufacturers, and organizations that face challenges managing their textile surplus—be it unsold, defective, or post-production waste. Our mission is to turn these materials into new opportunities through upcycling, repair, and circular design. Whether it’s repurposing end-of-season collections, extending product life through repair programs, or creating closed-loop production models, we help companies move from waste management to value creation. If your brand holds unused materials or wants to build a repair culture within your operations, we’re here to listen, design solutions together, and bring sustainability to life in tangible, measurable ways. www.renuu.world
2023
Director of Business Development
Jan 2023
We invest in the most ambitious content creators to unlock their full potential
2021
Angel Investor
Aug 2021
Rolling Fund + Syndicate Model with Modest Capital for Early Stage Startup Investors. Invests $20K - $50K in go-to-market stage technology startups. Shareholdings include - Nebyan Doğal, Barty Digital, Barakatech, Enhencer, HoustonBionics, Octovan, Oda Studio, GlaucoT, DatAnchor, Sweephy, Smpl, Scoutli, Postuby, Sensgreen, For Physician, Ecofoni, Handler, Pangea VR, OneNewOne and Sorbil. geometryventure.dev
Angel Investor
Aug 2021
Marmafarm targets to be the leading hydroponic greens producer in Turkey. Products mainly being, lettuce, mint, arugula, baby spinach, dill and parsley.
early stageFarming
Angel Investor
Jul 2021
Aposto is an Istanbul & New York-based independent digital media and technology company dedicated to building a captivating information landscape for tomorrow. We build next-generation digital media brands and community-focused online ventures capturing the zeitgeist of our times.
Show all 9 entries ↓