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Julian Eduardo Jaimes Castellanos

@julianeduardojaimesc

I build production Android and Compose Multiplatform apps with shared, offline-first experiences.

At Software Journeys, I build and lead delivery for production Android and Compose Multiplatform features in large B2C applications. I’ve delivered shared UI, offline-first repositories, GraphQL and REST networking, background transfers, and secure WebView workflows.

I’ve modernized legacy Android apps into shared Kotlin Multiplatform codebases, built cross-platform QR scanning and printer connectivity, and improved internal build delivery with Fastlane and GitHub Actions. I also support teams through planning, code review, quality control, and reusable developer tooling.

Experience

Work history, roles, and key accomplishments

Current

Middle Developer B

Current

Software Journeys SAS

Apr 2025 - Present (1 year 5 months)

Implemented Compose Multiplatform features across shared UI, presentation, and domain logic, including offline-first data and networking. Led technical delivery of WebView capabilities and Android WorkManager foreground transfers, and planned and quality-checked production Android work for a large B2C product.

Kotlin Compose Multiplatform ROOM Apollo GraphQL Ktor WorkManager WebView Fastlane GitHub Actions Datadog Android iOS

Junior Developer

Software Journeys SAS

May 2024 - Apr 2025 (11 months)

Modernized a legacy Android application from XML views and RxJava to Kotlin Flow and Compose Multiplatform, replacing separate Android and iOS apps with a shared-codebase application. Implemented QR code scanning on Android and iOS and built production design-system components and a Kotlin DSL for consistent styling.