Sertaç Selim Karakullukçu — Senior Product Designer & Design Lead
Hi, I'm Sertaç — Sr. Product Designer based in Istanbul. Crafting digital experiences, sharing the craft. Designer with a passion for teaching, turning intricate problems into elegant user journeys.
İstanbul’da yaşayan kıdemli ürün tasarımcısı (Senior Product Designer) ve tasarım lideri. Ajanslardan fintech ekiplerine, on üç yıldır dijital ürün tasarlıyorum; ağırlıkla finans, e-ticaret ve SaaS alanında 30+ proje.
About
Born in Istanbul in 1988, 13 years at the intersection of design, strategy and technology — from top-tier design agencies to fintech. Shaped design systems at Minus99 and SHERPA, led UI/UX teams at Fix360, contributed to Paribu, and served as Head of Product for Portföy, Aidat AI and Lojifi. Founder of Bold Frame Design Studio.
Experience
- Founder & Principal Designer — Boldframe Studio (March 2026 — Present). Independent product design lead for brands and startups: end-to-end product design, scalable design systems and strategic UI/UX.
- Head of Product Design — Portföy Fintech (Nov 2024 — Mar 2026). End-to-end product design strategy turning complex investment data into real-time tracking for stocks, crypto, IPOs and funds.
- UI/UX Team Lead — Fix360 Agency (Nov 2024 — Dec 2025). Led the UI/UX team on finance-focused projects and mentored designers.
- Product Designer — Paribu (Apr 2023 — Feb 2024). Web3 B2B and B2C products, scalable design systems, UX research and product strategy.
- Senior UI/UX Designer — SHERPA (Nov 2022 — Apr 2023). Interaction and UX standards, design principles and cohesive visual languages across platforms.
- Senior Product Designer — Minus99 (Nov 2016 — Nov 2022). End-to-end UI/UX across 15+ major digital projects and scalable design systems.
Selected work
Teknosa Pazaryeri
Marketplace e-commerce mobile app (iOS / Android). Mobile app concept lead; team honoured with Gold and Bronze Stevie® Awards in User Experience. www.teknosa.com
Can Yayınları
E-commerce web & mobile redesign for Turkey’s iconic publisher. Interaction and visual design. www.canyayinlari.com
SneaksUp
E-commerce web & mobile; visual storytelling and one-handed mobile ergonomics. 2nd place, Golden Spider (Altın Örümcek) Awards. www.sneaksup.com
AgeSa
Insurance mobile app UI/UX concept for iOS and Android.
Paribu Art Memory
Digital art platform within Paribu: concept, visual identity and responsive web/mobile UX. collection.paribu.com
Portföy
Zero-to-one crypto / fintech mobile product, design direction by Bold Frame Studio. theportfoy.com
Aidat AI
AI-powered property management app: product strategy, branding and mobile UX. aidat.ai
Lojifi
Logistics and freight app: brand identity and mobile product design. lojifi.com
Focus areas
AI products
From idea to launch, design and code.
Product design
Custom interfaces, crafted in Figma.
Branding
Logo and visual identity.
UX consulting
Audits, research and strategy.
Writing
Services
AI ürün tasarımcısı · Freelance ürün tasarımcısı · Logo ve marka kimliği · UX danışmanlığı
Contact
Available for freelance product design, design-system work and team leadership. hello@sertac.work · LinkedIn · Medium