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5 followers · 3 following
  • Spotify
  • Denver, Colorado

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Achievement: Pair Extraordinairex3Achievement: Pull Sharkx3Achievement: QuickdrawAchievement: YOLOAchievement: Arctic Code Vault Contributor

Achievements

Achievement: Pair Extraordinairex3Achievement: Pull Sharkx3Achievement: QuickdrawAchievement: YOLOAchievement: Arctic Code Vault Contributor

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jmuci/README.md

José M. Mucientes Fayos

Senior / Staff-level Android + Backend Product Engineer | 13+ years of experience | Colorado, USA

Kotlin everywhere. Systems thinker. Zero-to-one builder.

I build products end-to-end — from Android UI to backend services — with a strong bias toward experimentation, iteration, and measurable impact.

What I Do

  • 📱 Android (Kotlin, Compose, Coroutines, Flow, Hilt)

  • ⚙️ Backend (Ktor, JWT auth, Postgres, Exposed ORM, Docker, Microservices, K8s)

  • 🔄 API design & client-server contract modeling

  • 📊 Product experimentation & behavioral metrics

  • 🧠 Systems thinking with a product-first mindset

I’ve spent over a decade building high-scale consumer (Spotify Android Music App) and creator tools (Spotify for Artists Android App), most recently working across Android and backend systems to ship features that moved engagement, retention, and revenue.

Get my Resume!

Want to hire me? Shot me an email and tell me about the world class challenge you are solving!

  • Looking for a Senior / Staff purely Android Engineer → 📄Senior / Staff Android Engineer
  • Looking for an engineer capable of working on end-to-end from client code to backend? Looking for an engineer to lead and execute projects end-to-end? → 📄 Senior / Product Engineer

Github Activity

github contribution grid snake animation

How I Think

  • Build fast, but protect irreversible decisions.

  • Optimize for learning velocity in early-stage products.

  • Instrument everything.

  • Design for extensibility, not overengineering.

  • Tie technical decisions directly to business impact.

I’m especially interested in:

  • Commerce systems

  • Pricing & payments infrastructure

  • AI-augmented developer workflows

  • Product-led growth loops

Currently

  • Building side projects with Kotlin + AI-assisted workflows

  • Exploring agentic systems and commerce automation

  • Open to interesting zero-to-one product challenges

Tech Stack

Mobile
Kotlin • Jetpack Compose • MVVM • Clean Architecture • Room • Retrofit • Coil

Backend
Ktor • REST APIs • PostgreSQL • Exposed • Docker • Kotlin • Java • K8s

Tooling & Process
Experimentation frameworks • A/B testing • Feature flags • CI/CD

If you want to build something ambitious, pragmatic, and user-centered — let’s talk.

Me

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