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Malt Strategy
Sebastián Cardona HenaoSC

Sebastián Cardona Henao

Senior Android Developer

€250/day
Madrid, ES
3-7 years
Kotlin
Jetpack Compose
Clean Architecture
SOLID
Testing

Average response time: 1 hour

About Sebastián

I’m a Senior Android Engineer with 5+ years of professional experience building secure, scalable mobile applications, primarily in the banking and enterprise sectors. My expertise spans Kotlin, Jetpack Compose, Clean Architecture, and Coroutines, with a strong focus on performance, reliability, and testability. I’ve led the development of solutions serving 1M+ daily active users, mentored junior developers, and implemented architecture patterns that improved build times and code quality.

I’m passionate about privacy-first, user-centric products, and I’m currently expanding into Kotlin Multiplatform to deliver cross-platform business logic. My career goal is to continue shaping impactful mobile experiences while growing into technical leadership.

  • Spanish

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • Plexus Tech (Santander Digital Services)
    Senior Android Developer
    September 2023 - Today (2 years and 9 months)
    Developing mission-critical banking components within Santander's mobile
    architecture team, directly impacting 1M+ daily active users across European markets.
    • Architected and implemented secure WebView library adopted across all Santander
    Android applications, reducing service calls by 40% through intelligent caching
    strategies
    • Built comprehensive analytics framework using Clean Architecture principles,
    enabling real-time business intelligence and user behavior tracking
    • Established modular architecture patterns improving build times and enabling
    parallel feature development
    • Mentored junior developers on Kotlin best practices, Clean Architecture, and test-
    driven development
    Tech Stack: Kotlin, Jetpack Compose, Dagger Hilt, Coroutines/Flow, Room, Retrofit,
    MockK
    Kotlin Clean Architecture Jetpack Compose Dependency Injection Coroutines
  • Query Informática
    Android Developer
    April 2020 - September 2023 (3 years and 5 months)
    Led technical modernization of enterprise mobile applications serving 10,000+ field
    workers across Spain.
    • Migrated hundred lines of Java to idiomatic Kotlin, reducing codebase and bug reports
    • Implemented Clean Architecture across 4 production applications
    • Developed Bluetooth LE integration for POS systems
    • Built offline-first synchronization using WorkManager and Room, ensuring 100% data
    integrity
    • Achieved and maintained 99.5% crash-free user rate through systematic
    performance monitoring
    Tech Stack: Kotlin, MVVM, Clean Architecture, WorkManager, Room, Bluetooth LE,
    Coroutines
    SQLite MVVM Kotlin Java Clean Architecture

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Education

  • Big Data and Artificial Intelligence
    IES Severo Ochoa
    2023
    Big Data and Artificial Intelligence
  • Multiplatform Application Development
    IES Severo Ochoa
    2022
    Multiplatform Application Development

Skill set

Design Patterns
Software Architecture
Dependency Injection
Coroutines
SQLite
MVVM
Java

Categories