Senior Android Engineer · Kotlin Multiplatform advocate · On-device AI builder

I build high-quality mobile and multiplatform systems with Kotlin, Jetpack Compose, and Kotlin Multiplatform — with a growing focus on on-device LLMs and privacy-first ML.

🔧 Senior Android Developer @ Kleinanzeigen
📍 Barcelona

Llamatik 🦙 · MultiplatformKickstarter 🚀 · X / @ponsaffair

I care deeply about clean architecture, performance, and developer experience.

At Kleinanzeigen, I work on large-scale Android apps, pushing modern Android practices with Jetpack Compose and scalable architectures. Outside of work, I explore Kotlin Multiplatform, Compose Multiplatform, and on-device machine learning, especially LLM inference without cloud dependencies.

When I’m not coding:

• 🏀 Playing competitive basketball (Club Bàsquet Cabrera)
• 🔭 Stargazing with my telescope
• 🎧 Hip hop + gaming

Core

• Kotlin · Java · Kotlin Multiplatform (KMP)
• Jetpack Compose · Compose Multiplatform
• Coroutines · Flow · Gradle · Git

Focus areas

• On-device ML & LLM inference (llama.cpp, GGUF models)
• Multiplatform libraries & shared business logic
• Robust, testable Android architectures
• High-performance, smooth UI with Compose

Kotlin Multiplatform LLM inference library built on top of llama.cpp.

• On-device inference for Android, iOS, Desktop
• Offline-first & privacy-preserving
• Shared Kotlin API across platforms

👉 https://github.com/ferranpons/llamatik

An Android location picker library — a long-running project where I experiment with:

• UI/UX improvements
• Performance optimizations
• API design

• Llamatik — expanding on-device LLM capabilities for Kotlin developers
• MultiplatformKickstarter — guides, resources, and starter templates for KMP & Compose Multiplatform
• Experiments combining shared Compose UIs + KMP business logic across platforms

• Collaborating on Kotlin Multiplatform or Compose Multiplatform projects
• Mentoring developers on Kotlin, Compose, and KMP architecture
• Speaking at meetups or conferences about:
  • Compose Multiplatform
  • On-device AI & mobile ML
  • Kotlin Multiplatform in production

• 🌐 Website / Blog — https://ferranpons.com
• 🚀 Multiplatform resources — https://multiplatformkickstarter.com
• 🐦 X — https://x.com/ponsaffair
• 📧 Email — [email protected]

Thanks for stopping by 👋
Feel free to reach out or explore my projects.