Hello, I'm Omar

Omar Hamid portrait

Crafting exceptional mobile experiences with Kotlin and Swift.
Passionate about clean architecture, robust engineering, and delightful UI.

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About Me

For over 10 years, my passion has been crafting high-quality mobile experiences as a Senior Mobile Engineer.

⟡Mobile Specialist

I specialize in the Kotlin ecosystem, building scalable applications for Android (Jetpack Compose) and iOS (SwiftUI).

⟡Full-Stack Approach

I believe in end-to-end ownership, architecting solutions that span the entire mobile stack with Kotlin Multiplatform.

⟡Backend Development

I develop robust backend APIs using Ktor and Spring Boot to support modern mobile applications.

⟡Team Leadership

As a Scrum Master and Delivery Manager, I foster a culture of continuous improvement for successful project outcomes.

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Mobile Development

Kotlin & Jetpack ComposeExpert
Swift & SwiftUIProficient
KMP/CMP (Multiplatform)Advanced

Backend Development

Spring BootProficient
KtorProficient
RESTful APIsExpert

DevOps & CI/CD

CI/CD PipelinesExpert
FastLaneAdvanced
Automated TestingExpert
DockerExpert

Methods & Practices

Agile/ScrumExpert
Code Review & QAExpert
Performance OptimizationAdvanced
Security Best PracticesProficient

My Projects

Here are some of the projects I've worked on as a mobile engineer. My focus has been on creating responsive, user-friendly applications with clean code and exceptional user experiences.

  • Payback App
    Payback App

    Mobile payment & reward program

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  • BVB FC
    BVB FC

    Borussia Dortmund official mobile app

    View
  • Westham FC
    Westham FC

    Westham official mobile app

    View
  • Navvis Ivion Go
    Navvis Ivion Go

    Indoor Mapping

    View
  • Bde Bank
    Bde Bank

    Mobile banking app

    View
  • BLC Bank
    BLC Bank

    Mobile payment app

    View

Blog Posts

Articles I've published — also available on Medium.

From A to O(n): Advanced & Specialized Trees — Heaps and Tries

From A to O(n): Advanced & Specialized Trees — Heaps and Tries

From A to O(n): Advanced & Specialized Trees — Heaps and Tries Meet the specialists — learn how Heaps manage priority with O(1) access and how Tries enable lightning-fast autocomplete and prefix searches. Welcome back!…

From A to O(n): Thinking in Hierarchies — Trees and Search

From A to O(n): Thinking in Hierarchies — Trees and Search

From A to O(n): Thinking in Hierarchies — Trees and Search Move beyond linear data and explore the world of nodes and branches with Binary Trees, BSTs, and the essential DFS & BFS traversal patterns. Welcome back to the…

From A to O(n): The Power of Hashing — HashMaps and HashSets

From A to O(n): The Power of Hashing — HashMaps and HashSets

From A to O(n): The Power of Hashing — HashMaps and HashSets Uncover the magic behind O(1) lookups and learn how the Frequency Counting pattern can solve complex problems with stunningly simple code. Welcome back to the…

From A to O(n): Ordered Access — Stacks and Queues

From A to O(n): Ordered Access — Stacks and Queues

From A to O(n): Ordered Access — Stacks and Queues Master LIFO and FIFO principles, learn why ArrayDeque is Kotlin’s unsung hero, and unlock the power of the Monotonic Stack pattern. Welcome back! In Part 2 , we…

From A to O(n): Linear Data Structures — Arrays vs. Linked Lists

From A to O(n): Linear Data Structures — Arrays vs. Linked Lists

From A to O(n): Linear Data Structures — Arrays vs. Linked Lists A head-to-head comparison of the two most fundamental data structures and an introduction to the Two Pointers and Sliding Window patterns. Welcome back to…

From A to O(n): The Foundations of Algorithmic Thinking

From A to O(n): The Foundations of Algorithmic Thinking

Learn the three pillars of writing efficient code — Big O, Data Structures, and Patterns. The first part of a complete guide to mastering algorithmic thinking in Kotlin. Welcome, fellow Kotlin developer! Anyone can…

Clean Android Architecture in 2025: SOLID Principles, Supercharged by Kotlin

Clean Android Architecture in 2025: SOLID Principles, Supercharged by Kotlin

In the ever-evolving landscape of Android development, crafting clean, maintainable, and scalable applications isn’t just a technical goal — it’s a business imperative. While these practices align with Google’s official…

From Android to API: A Guide to Building a Dockerized Ktor & PostgreSQL Backend

From Android to API: A Guide to Building a Dockerized Ktor & PostgreSQL Backend

A step-by-step journey applying Clean Architecture and professional testing to create a complete, containerized Kotlin REST API. As a longtime Android developer, I’ve always been fascinated by the backend but often saw…

The Kotlin Flow Operator Cheat Sheet

The Kotlin Flow Operator Cheat Sheet

A practical guide to demystifying asynchronous streams for everyday development. Handling real-time user input, multiple network responses, and database updates can quickly tangle your code into a complex mess. This is…

Kotlin Coroutine Cancellation: An Advanced Guide

Kotlin Coroutine Cancellation: An Advanced Guide

Coroutines make Android development safer and more efficient — but only if you handle cancellation correctly. This guide covers everything from the basics to real-world scenarios and best practices for writing robust,…

Read all my articles

The full archive lives on Medium — including pieces older than what fits here.

View on Medium

Contact Me

Have a project in mind or want to explore opportunities? I'd love to hear from you.