# Martín Zangl Martín Zangl is a remote worker on Himalayas, Senior Android Engineer at Checkout.com, based in Spain. Source: https://himalayas.app/@martnzangl ```text Senior Android Engineer at Checkout.com who shipped a payment SDK and raised Swift Medical’s crash-free users to 99.6%. ``` | Detail | Value | | --- | --- | | Availability | Looking for a job | | Location | Spain | | Authorized to work in | Spain | | Salary expectations | 57k+ EUR | | Job categories | Android Engineer, Mobile Engineer, Software Engineer | | Skills | Android, Kotlin, Jetpack Compose, Android SDK, Coroutines, Flow, RxJava, WorkManager, ROOM, MVVM, MVP, Clean Architecture, Uni Directional Data Flow (MVI), Modular Architectures, Server Driven UIs | | LinkedIn | https://linkedin.com/in/martinzangl | | GitHub | https://github.com/mizangl | ## What I'm looking for ```text My contract at Checkout.com has completed, and I’m available immediately. I’m looking for roles in Spain or with remote-first European teams. ``` ## About ```text At Checkout.com, I worked on the Payment Flow SDK and merchant integration tooling across Android, iOS and React Native. I published a Kotlin and Jetpack Compose sample app, implemented native SDK changes to complete two React Native releases, and moved payment component spacing into the public styling API. At Swift Medical, I rebuilt the offline-first app’s synchronization queue in Room, preserving document order while leaving WorkManager to execute the work. Documents that had sat on devices for months synchronized, and the number of Worker instances came down. I profiled long-session crashes with Android Profiler and Perfetto, then moved the paths users hit most from RxJava to Coroutines and rebuilt some screens in Jetpack Compose. Across a full working session, memory use fell by about 24%, CPU by about 33%, and crash-free users settled at 99.6%. At PayPal and Mercado Libre, I delivered credit and payment journeys, strengthened end-to-end testing, and built reusable Android components. I’m at my best when a production problem that looks like a bug turns out to be an architecture problem; I’m based in Valencia and available immediately for roles in Spain or remote-first European teams. ``` ## Experience ### Senior Android Engineer [Checkout.com](https://himalayas.app/companies/checkout-com). Nov 2025 - Jul 2026 ```text Worked on the Payment Flow SDK and merchant integration tooling across Android, iOS, and React Native. Published the public sample app, implemented co-branded card scheme support, and wrote a Gradle plugin for API key management. ``` Skills: Kotlin, Jetpack-Compose, Android-SDK, Swift, IOS-SDK, React-Native, TypeScript, Gradle, Payment-SDKs, Card-Payment ### Senior Android Engineer Swift Medical. Mar 2023 - Oct 2025 ```text Owned reliability and feature work on an offline-first wound-care app, rebuilding the sync queue in Room and migrating key paths off RxJava. Improved crash-free users from 70% to 99.6% and supported native Android and iOS in the Flutter successor. ``` Skills: Kotlin, Java, Android-SDK, Coroutines, Flow, RxJava, MVVM, MVP, Clean-Architecture, Dagger, ROOM, Realm, WorkManager, Flutter, Dart, Swift, Objective-C, OpenCV, TensorFlow, Android-Profiler, Perfetto, Gitlab-CI, Junit, MockK, Espresso, FHIR ### Senior Android Engineer [PayPal](https://himalayas.app/companies/paypal). Nov 2021 - Jan 2023 ```text Worked on Savings and Credits UK within PayPal Wallet's modular architecture. Restructured flows onto MVVM and unidirectional data flow, built an end-to-end test library, and delivered complete credit flows across Android, iOS, and Java backend. ``` Skills: Kotlin, Java, Android-SDK, Android-Jetpack, Coroutines, DI-Dagger-Hilt, MVVM, UDF, Junit, Espresso, Page-Object-Model, Jenkins, SonarQube, JaCoCo, Splunk, Postman ### Senior Android Engineer [Mercado Libre](https://himalayas.app/companies/mercado-libre). Apr 2020 - Nov 2021 ```text Built payment and installment flows for the virtual credit card, working from product and customer journey to API contracts. Created an SDK for resource handling and defined metrics for middle-end performance and business measures. ``` Skills: Kotlin, Java, Android-SDK, Jetpack, Coroutines, FLEX-(Internal-UDF-Framework), Server-Driven-UIs, Swift, Datadog, New-Relic ### Senior Android Engineer [Santex](https://himalayas.app/companies/santex). May 2015 - Apr 2020 ```text Led Android development across four domains including an IoT e-bike platform and a contribution to Zynga's Words with Friends. Set up automated builds, owned code review and conventions, and ran an internal RxJava workshop. ``` Skills: Android, Java, Kotlin, Jetpack, Flutter, Dart, React-Native, React, JavaScript, Swift, Objective-C, Firebase, Jenkins, CircleCi ### Semi-Senior Android Engineer [Globant](https://himalayas.app/companies/globant-commerce-studio). May 2014 - May 2015 ```text Delivered Android work for BBVA and JPMorgan Chase, including a conference-room booking app and migration of a legacy web mobile app to native Android using MVP. Contributed to JPMorgan's internal application store. ``` Skills: Android, Java, Dagger, Apache-Cordova, Jenkins, SVN, Git, Jira ### Android Engineer Taller Technologies. Mar 2013 - May 2014 ```text Built Android components for Intel's Context Aware middleware SDK and implemented a real-time electronic price tag client over XMPP. Set up CI for the Android project. ``` Skills: Android, Java, JavaScript, NodeJS, XMPP, SQLite, Junit, Jenkins, Bamboo ### Software Developer Freelance. Sep 2005 - Mar 2010 ```text Built custom software for small businesses while studying, including Java Swing desktop applications and an IoT taximeter with Arduino and Android client. ``` Skills: Java, Java-EE, Java-Swing, C, Android, MySQL, SQLite, Arduino ## Education ### JetBrains Kotlin Professional Certificate, Kotlin ```text Kotlin Professional Certificate from JetBrains, completed in 2026. ``` ### Universidad Tecnológica Nacional B.S., Information Systems Engineering ```text B.S. in Information Systems Engineering from Universidad Tecnológica Nacional, Córdoba, Argentina, completed in 2013. ``` ### JetBrains Jetpack Compose and Internals, Jetpack Compose ```text Cohort course on Jetpack Compose and Internals. ``` ## Tech stack - Postman - Splunk - SonarQube - JaCoCo - Jenkins - CircleCI - GitLab CI - Bamboo - React Native - Flutter - Apache Cordova - MySQL - SQLite - Node.js - Android SDK - Mixpanel - OpenCV - Jira - Gradle - RxJava - JavaScript - Java - Kotlin - Swift - C - Objective-C - Dart - Java EE - TensorFlow - XMPP - New Relic - Datadog - Firebase - TypeScript - Flow - JUnit - Git - Firebase Crashlytics - Espresso - Dagger - Arduino - Android - Java Swing To contact Martín, message them from this profile with a Himalayas employer account: [Hire on Himalayas](https://himalayas.app/hire). ## People also viewed - [Zeyad Gasser](https://himalayas.app/@zeyadgasser): Principal Android Engineer, Trainline - [Ismael User](https://himalayas.app/@ismaeluser): Senior Android Developer, Freelance - [Alberto López](https://himalayas.app/@albertolopez): Senior Software Engineer, Revolut - [Juan Carlos Peñalver](https://himalayas.app/@juancarlospealver): Senior Android Engineer, TomTom - [Miguel Angel Mialdea Monzo](https://himalayas.app/@miguelangelmialdeamo): Senior Android Engineer, Globant - [Juan Jesús Carro Olmedo](https://himalayas.app/@juancarro): Android Engineer, Divergente - [Nick Konorev](https://himalayas.app/@nickkonorev): Senior Android Engineer / Android Lead, Interface Labs - [Fernando Gonzalez Serrano](https://himalayas.app/@fernandogonzalezserr): Android Developer, Exis TI (Altia) - [Clelia López](https://himalayas.app/@clelialpez): Senior Android Developer, Porsche Digital Barcelona - [Pol Gómez Guerrero](https://himalayas.app/@polgmezguerrero): Senior Android Engineer, Kenos Technology