About Mantas Butenas

👋 Hi, I’m Mantas - a US-based mobile developer with 4+ years of experience building clean, modern apps using Kotlin, Jetpack Compose, and Kotlin Multiplatform.

laptop computer beside coffee mug
laptop computer beside coffee mug

My Journey into Mobile Development

I earned a First Class Honours Degree in Computer Science from the University of Leicester. During my studies and internships, I explored full stack web development, but once I got into Android, I was hooked. The creative process of building functional, beautiful mobile apps felt like the perfect mix of engineering and design.

Since then, I’ve:

  • Built 100+ Jetpack Compose UI screens at Assa Abloy

  • Developed mental health and auditing apps at Techfinity

  • Contributed to apps with 100K+ downloads

  • Launched my own app - Cardly, a vocabulary flashcards tool built with Kotlin and Jetpack Compose

A close-up of a person using a laptop, with programming code displayed on the screen. A smartphone lies on the wooden table next to a Starbucks coffee cup with a logo. The atmosphere appears warm with soft lighting.
A close-up of a person using a laptop, with programming code displayed on the screen. A smartphone lies on the wooden table next to a Starbucks coffee cup with a logo. The atmosphere appears warm with soft lighting.

What I’m Doing Now

I’m focused on:

  • Kotlin Multiplatform Mobile (KMM) for cross-platform app development

  • Clean, modular architecture for long-term app scalability

  • Building new mobile tools and sharing insights via my newsletter

Workspace with laptop, coffee, notebook, and pens - a productive setup for mobile development
Workspace with laptop, coffee, notebook, and pens - a productive setup for mobile development

Technologies I Work With

Languages: Kotlin, Java, SQL
Core Tools: Jetpack Compose, Room, Retrofit, Hilt, Firebase, Coroutines, Flow
Architecture: MVVM, Clean Architecture, TDD
Dev Practices: Agile, code reviews, Figma-based UI collaboration

black flat screen computer monitor
black flat screen computer monitor
person working on blue and white paper on board

Collaborate on Your Mobile Project

I’m open to freelance opportunities and collaborations on mobile projects: from MVPs to scalable apps. I specialize in Kotlin, Jetpack Compose, and Kotlin Multiplatform.

Get in Touch

Experienced Android Developer with Jetpack Compose & Kotlin Multiplatform skills.

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