Cristian is available for hire
Hire CristianCristian González
Verified Expert in Engineering
Mobile Application Developer
Oshawa, ON, Canada
Toptal member since March 7, 2025
Bio
Cristian is a senior Android/mobile engineer with 14+ years in software and 10+ years focused on Android. He builds reliable, user-centered products using Kotlin, Jetpack Compose, and modern architecture, and contributes to shared logic in Kotlin Multiplatform. He's experienced in web, back end, APIs, databases, and iOS, and adapts beyond Android. He works with product teams to clarify needs and uses AI coding agents to accelerate delivery, owning technical decisions, code review, and quality.
Portfolio
DoorDash
Android, Android App Development, Android Development, Android Jetpack...
IOHK
Android SDK, Kotlin/Native, Coroutines, Jetpack Room, REST, Ktor...
Presto
Android SDK, Leadership, Android Jetpack, Android Studio, Java, Kotlin/Native...
Experience
- Android - 10 years
- Digital Innovation - 10 years
- User-centered Development (UCD) - 10 years
- Android Jetpack - 7 years
- Complex Problem Solving - 6 years
- Kotlin/Native - 4 years
- Leadership - 2 years
- Jetpack Compose - 1 year
Work Experience
Senior Software Developer
2025 - PRESENT
DoorDash
- Built Android UI and handoff logic for an out-of-stock experiment; results showed 3.2 % fewer cancellations, 2.2 % fewer refunds per delivery, and 1.1 % fewer out-of-stock-related late deliveries.
- Contributed Kotlin Multiplatform business logic shared by Android and iOS merchant apps, keeping core behavior consistent while each platform retained native UI and rendering.
- Applied AI-assisted workflows to scope features, guide coding agents, and validate output with human review, unit/E2E tests, emulator checks, and CI.
Technologies: Android, Android App Development, Android Development, Android Jetpack, Android SDK, Android Studio, Clean Architecture, Complex Problem Solving, Coroutines, Kotlin, Kotlin/Native, Kotlin Multiplatform, Kotlin Flows, Kotlin Multiplatform Mobile (KMM), LLM Agents, Claude Code, Codex, Cursor AI, Agentic Coding, Claude, Artificial Intelligence (AI), Large Language Models (LLMs), Front-end
Senior Android Engineer
2022 - 2024
IOHK
- Developed the Identus Edge Agent SDK from early stages using Kotlin Multiplatform, decentralized identifiers (DIDs), DID communication (DIDComm), anonymous credentials (AnonCreds), and SD-JWT.
- Integrated SSI protocols to ensure strong encryption and secure data exchange, laying the groundwork for seamless future implementations.
- Leveraged interface-oriented architecture, coroutines, and SQLDelight to improve code reliability and maintainability.
Technologies: Android SDK, Kotlin/Native, Coroutines, Jetpack Room, REST, Ktor, JSON Web Tokens (JWT), Android, Android Studio, Android Jetpack, Kotlin Multiplatform, XML, JSON, JavaScript, Complex Problem Solving, Digital Innovation, User-centered Development (UCD), Unit Testing, Clean Architecture, Kotlin, Software Development, Mobile Development, Mobile Apps, Mobile App Development, Android Development, Android App Development, Software Engineering, Kotlin Multiplatform Mobile (KMM), Decentralized Identifiers (DIDs), SQLDelight, Python, Front-end
Senior Android Engineer
2020 - 2022
Presto
- Engaged as a project lead and orchestrated the design and development of an Android device's health monitoring system using Jetpack components, RxJava, and Retrofit, monitoring 500,000+ devices across the US and Canada.
- Enhanced system reliability by identifying performance bottlenecks, improving stability, and contributing to a more responsive user experience.
- Refactored the Android app legacy code by migrating from Java to Kotlin and adopting MVVM architecture and Jetpack components like Room, ViewModel, and LiveData to streamline data handling and scalability.
Technologies: Android SDK, Leadership, Android Jetpack, Android Studio, Java, Kotlin/Native, Model View ViewModel (MVVM), Android, XML, JSON, Dependency Injection, Coroutines, Jetpack Room, Complex Problem Solving, Digital Innovation, User-centered Development (UCD), Unit Testing, Clean Architecture, Kotlin, Software Development, Software Engineering, Mobile Apps, Mobile App Development, Mobile Development, Android Development, Android App Development, RxJava, Retrofit, Room, LiveData, Front-end
Android Engineer
2019 - 2019
Mapsted
- Engineered a mall-oriented indoor GPS Android application from concept to MVP using MVVM and Jetpack components like ViewModel, LiveData, Room, and Navigation.
- Delivered the initial product on schedule, enabling iterative improvements.
- Collaborated with the iOS team to ensure common features and designs were maintained.
Technologies: Android SDK, REST, Android Jetpack, Model View ViewModel (MVVM), JSON, Android, Android Studio, XML, Java, Jetpack Room, Complex Problem Solving, Digital Innovation, User-centered Development (UCD), Software Development, Software Engineering, Mobile Apps, Mobile App Development, Mobile Development, Android App Development, Android Development, Minimum Viable Product (MVP), LiveData, Room, Navigation, Front-end
Mobile Developer
2016 - 2019
FeaturePoints
- Architected and deployed Android and iOS apps, integrating REST APIs and delivering dynamic views and smooth user interactions.
- Learned Swift rapidly to build a feature-rich iOS app alongside the Android version, successfully launching both within six months.
- Employed MVVM and Jetpack components to enhance maintainability, reduce technical debt, and boost user satisfaction.
Technologies: Android SDK, Swift, iOS, Java, Android Studio, Xcode, REST, Android, Android Jetpack, XML, JSON, Jetpack Room, Model View ViewModel (MVVM), Digital Innovation, User-centered Development (UCD), Software Development, Software Engineering, Mobile Apps, Mobile App Development, Mobile Development, Android App Development, Android Development, iOS App Development, REST APIs, Front-end
Android Developer
2014 - 2016
Jungle Prize
- Developed an app to list weekly game challenges with a chance to win a prize. This required communication with Unity games and a REST API.
- Created a bridge for the Android app to communicate with the on-device Unity games to set difficulty and other variables and fetch results for the scoreboard.
- Built a strong foundation based on the requirements, used top-performing libraries for different tasks, and worked with the iOS team to ensure both platforms performed similarly.
Technologies: Android, Android SDK, Java, REST, JSON, XML, Digital Innovation, User-centered Development (UCD), Software Development, Software Engineering, Mobile Apps, Mobile App Development, Mobile Development, Android Development, Android App Development, REST APIs, Front-end
Project History
Indoor Navigation App for Malls
https://mapsted.com/indoor-navigation/An Android app that brings indoor navigation to mall customers. The app uses proprietary technology that enables users to navigate without hardware or GPS location.
The app provides mall and store information, an interactive 3D map of the mall, and a way to define single or multiple routes within the mall.
The app provides mall and store information, an interactive 3D map of the mall, and a way to define single or multiple routes within the mall.
Data Analytics App
An Android app that analyzes Canadian immigration data to help immigrants applying for permanent residency better understand the process and their chances of getting into the system.
The app displayed real-time data of the express entry draws of invitations and notified users when that happened.
The app displayed real-time data of the express entry draws of invitations and notified users when that happened.
Digital Identity Android SDK
https://github.com/hyperledger-identus/identus/An Android SDK that provides features for digital identity.
The SDK combined DID and DIDComm 2 technologies for encrypted and secure communication. It also uses cryptography libraries to encrypt public and private keys and verifiable credentials, such as AnonCreds, SD-JWT, and zero-knowledge proofs.
The SDK combined DID and DIDComm 2 technologies for encrypted and secure communication. It also uses cryptography libraries to encrypt public and private keys and verifiable credentials, such as AnonCreds, SD-JWT, and zero-knowledge proofs.
DoorDash Order Manager
https://play.google.com/store/apps/details?id=com.dd.ddmerchantDoorDash Order Manager is an all-in-one tool for taking in orders, adjusting and managing them before preparation, and keeping them on track from pickup to delivery. Get help when you need it with live chat support. Grow your business through delivery.
Education
2009 - 2011
Associate's Degree in Software Development
Monlau Formación Profesional - Barcelona, Spain
Skills
Libraries/APIs
Jetpack Room, RxJava, Retrofit, LiveData, REST APIs, Kotlin Flows
Tools
Android Studio, Android Jetpack, Claude, Xcode, Claude Code, Codex
Languages
Java, Kotlin, XML, JavaScript, HTML, C++, Swift, Python
Frameworks
Android SDK, Ktor, JSON Web Tokens (JWT)
Platforms
Android, iOS, Firebase
Storage
JSON
Paradigms
Dependency Injection, REST, Model View ViewModel (MVVM), Unit Testing, Clean Architecture, Mobile Development
Other
Kotlin/Native, Front-end, Jetpack Compose, Coroutines, Complex Problem Solving, Digital Innovation, User-centered Development (UCD), Artificial Intelligence (AI), Large Language Models (LLMs), Kotlin Multiplatform, Leadership, Software Development, Mobile Apps, Mobile App Development, Android Development, Android App Development, Software Engineering, Kotlin Multiplatform Mobile (KMM), Decentralized Identifiers (DIDs), SQLDelight, Room, Minimum Viable Product (MVP), Navigation, iOS App Development, Zero-knowledge Proofs, LLM Agents, Cursor AI, Agentic Coding
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