Catalin is available for hire
Hire CatalinCatalin Ivan
Verified Expert in Engineering
Android Developer
Bucharest, Romania
Toptal member since March 21, 2022
Bio
Catalin is an experienced Android developer with a demonstrated history of working in the information technology and services industry. He is skilled in Kotlin, databases, mobile applications, Java, Android SDK, and object-oriented programming (OOP). Catalin is a strong engineering professional with an engineering degree in computer science from the Politehnica University of Bucharest.
Portfolio
Autonomy on Board GmbH
Android, Kotlin, Android Auto, Android SDK, Front-end, CircleCI, Testing...
Wayne Barber Moodie
Kotlin, Android Studio, Android, Android Architecture Components...
GTL
Kotlin, Android Studio, Android SDK, Jenkins, GitLab CI/CD, Jira, HTTP...
Experience
- Android - 12 years
- Android SDK - 11 years
- HTTP REST - 10 years
- Android Studio - 8 years
- Kotlin - 6 years
- Android Architecture Components - 4 years
- Android Jetpack - 2 years
- Coroutines - 2 years
Preferred Environment
Jira, GitLab, Jetpack Compose, Kotlin, Coroutines, Model View Intent (MVI), Model View ViewModel (MVVM), Retrofit 2, GitHub, Azure
The most amazing...
...app I've built is one of LEGO's Android apps designed for children to provide them with a fun and stable experience.
Work Experience
Android Developer
2023 - 2023
Autonomy on Board GmbH
- Developed a native Android app that was part of an automotive ecosystem aimed at facilitating the use of productivity tools via voice interface while driving.
- Implemented a location/ETA-sharing feature via a Location API and Google Maps SDK.
- Refactored the onboarding flow extensively to improve user retention.
- Researched and implemented several optimization tweaks.
Technologies: Android, Kotlin, Android Auto, Android SDK, Front-end, CircleCI, Testing, A/B Testing, Sentry, Coroutines, Android Jetpack, Dagger 2, Model View ViewModel (MVVM), Room, Jira, Google Maps SDK, Glide, Firebase Android SDK, LiveData, Observer Pattern, Android Studio, WebView, Android App Design, Consumer-facing Products, Jetpack Compose, API Integration, JUnit, Espresso, MockK, Mockito, REST APIs, Crash Fixing
Kotlin Developer
2022 - 2022
Wayne Barber Moodie
- Provided the architecture and POC for an Android assistant-like app.
- Implemented speech recognition and speech-to-text capabilities leveraging the Android SDK speech recognition engine.
- Implemented location retrieval: latitude, longitude, altitude, speed, and bearing.
Technologies: Kotlin, Android Studio, Android, Android Architecture Components, Android Jetpack, Speech Recognition, Speech-to-Text (STT), Google Location API, Mobile, Mobile Development, Mobile UI, Mobile App Development, Mobile UX, Front-end Development, Clean Architecture, Front-end, Git, Android Development, Mobile Apps, Mobile Applications, Glide, LiveData, Observer Pattern, Android App Design, API Integration, REST APIs, Crash Fixing
Senior Android Developer
2020 - 2022
GTL
- Acted as an Android consultant for GTL, one of the leaders in correctional technology and educational solutions helping in rehabilitating inmates and payment services solutions for the government.
- Maintained, improved, and expanded GTL's Android app portfolio of over 50 closed-circuit apps.
- Converted the legacy Java apps to Kotlin to improve maintainability and ease of coding.
- Collaborated with the ROM team to fix the device and operating-system-specific issues.
- Assisted with the transition from Jenkins to GitLab CI/CD.
Technologies: Kotlin, Android Studio, Android SDK, Jenkins, GitLab CI/CD, Jira, HTTP, Authentication, Mobile, Java, APIs, User Interface (UI), User Experience (UX), Mobile Development, Mobile UI, Mobile App Development, Mobile UX, Android, Front-end Development, OkHttp, Unit Testing, Clean Code, Clean Architecture, REST, Amazon Web Services (AWS), Front-end, Testing, Android Development, Multithreading, Mobile Apps, Mobile Applications, Glide, LiveData, Observer Pattern, WebView, Android App Design, Jetpack Compose, API Integration, JUnit, MockK, Mockito, REST APIs, Crash Fixing, Video Streaming
Senior Android Developer
2018 - 2020
LEGO
- Developed LEGO TV, an Android app designed for children, providing a fun and stable experience in over 20 countries.
- Fixed the performance issues related to asynchronous work done through RxJava.
- Took part in several workshops to add value to the app by finding strong feature candidates.
- Translated the design and business requirements into scalable and maintainable code.
Technologies: Kotlin, Android Studio, RxJava 2, Dagger, Retrofit, HTTP, Push Notifications, Authentication, Mobile, APIs, User Interface (UI), User Experience (UX), Android Animations, Mobile Development, Mobile UI, Mobile App Development, Mobile UX, Android, Front-end Development, OkHttp, Clean Architecture, REST, Front-end, Testing, Git, Android Development, Firebase Cloud Messaging (FCM), Multithreading, GraphQL, Mobile Apps, Mobile Applications, Glide, Firebase Android SDK, Reactive Programming, LiveData, Observer Pattern, WebView, Android App Design, Large-scale Projects, Consumer-facing Products, Widgets, API Integration, JUnit, REST APIs, Crash Fixing, Crashlytics, Video Streaming
Lead Android Developer
2016 - 2018
Ticketscript
- Developed and maintained the Ticketscript's Android app stack—Flow, Ticketbox, and Flow Pro.
- Implemented a custom communication protocol to allow ticket printing on dedicated printers.
- Fixed the critical production bugs that prevented apps from scaling up to events with large numbers of attendees.
Technologies: Android SDK, Android Studio, SQLite, QR Codes, HTTP REST, JSON, Bluetooth, HTTP, Mobile, APIs, User Interface (UI), User Experience (UX), Camera API, Mobile Development, Mobile UI, Mobile App Development, Mobile UX, Android, Front-end Development, eCommerce, REST, Front-end, Android Development, Firebase Cloud Messaging (FCM), Networking, Multithreading, Mobile Apps, Mobile Applications, Camera2 API, Firebase Android SDK, Java, WebView, Fastlane, Android App Design, Large-scale Projects, Consumer-facing Products, Online Payments, B2C, API Integration, REST APIs, Crash Fixing, Crashlytics
Senior Android Developer
2015 - 2016
Appscend
- Developed an Android library for maintaining and synchronizing generic data objects in the cloud.
- Helped showcase the library's capabilities by developing an Android demo app.
- Implemented custom animations for different UI elements.
Technologies: Android SDK, Android Studio, HTTP, Push Notifications, Mobile, APIs, Mobile Development, Mobile UI, Mobile App Development, Mobile UX, Android, Front-end Development, REST, Android Development, Multithreading, Mobile Apps, Mobile Applications, Java, WebView, Android App Design, API Integration, REST APIs, Crash Fixing
Senior Android Developer
2014 - 2015
DeinDeal
- Developed the Android native app for the top Swiss off-price eCommerce company from the ground up.
- Created the architecture for the app and chose the library stack and development patterns.
- Played a key role in overseeing the entire lifecycle of the app.
- Collaborated closely with the design and product teams to ensure the app met business and UI/UX requirements.
Technologies: Android SDK, Java SE (Core Java), SQLite, Android Studio, HTTP, Push Notifications, Mobile, Java, APIs, User Interface (UI), User Experience (UX), Android Animations, Mobile Development, Mobile UI, Mobile App Development, Mobile UX, Android, Front-end Development, eCommerce, REST, Front-end, Git, Android Development, Firebase Cloud Messaging (FCM), Multithreading, Mobile Apps, Mobile Applications, WebView, Android App Design, Large-scale Projects, Consumer-facing Products, Online Payments, B2C, API Integration, REST APIs, Crash Fixing, Crashlytics
Senior Android Developer
2012 - 2014
Throwpoint
- Developed the Android client app for the World Economic Forum.
- Handled server-side data changes dynamically within the app.
- Used the Calendar API to create and synchronize events.
- Enabled and implemented push notifications functionality for the app.
- Uploaded the release builds to Google and Amazon app stores.
Technologies: Android SDK, Visual Studio, SQLite, Google Calendar API, JSON, HTTP REST, HTTP, Mobile, Firebase, Java, APIs, User Interface (UI), User Experience (UX), Android Animations, Mobile Development, Mobile UI, Mobile App Development, Mobile UX, Android, Front-end Development, REST, Front-end, Android Development, Firebase Cloud Messaging (FCM), Multithreading, Mobile Apps, Mobile Applications, Android Studio, WebView, Android App Design, API Integration, REST APIs, Crash Fixing
Android Developer
2011 - 2012
Seesmic
- Developed a popular social networks aggregator Android app.
- Played a key role in the team that developed an Android Salesforce CRM app.
- Used cutting-edge technologies to accomplish complex technical tasks.
Technologies: Android SDK, Java SE (Core Java), IntelliJ IDEA, Facebook API, X (formerly Twitter) API, HTTP, Encryption, Mobile, Java, APIs, User Interface (UI), Android Animations, Mobile Development, Mobile UI, Mobile App Development, Mobile UX, Android, Front-end Development, REST, Android Development, Multithreading, Mobile Apps, Mobile Applications, Android App Design, API Integration, REST APIs, Crash Fixing
Software Engineer
2010 - 2011
BANDAI NAMCO ENTERTAINMENT Romania SRL
- Ported an OpenGL 2D game, Crush the Castle, on the Windows mobile platform.
- Conducted code reviews for several third-party Java (J2ME) projects.
- Ported two J2ME games to the internal framework and completely refactored the code and resources.
Technologies: Java SE (Core Java), Visual Studio, Windows CE, C++, Mobile, Java, Mobile Development, Mobile UI, Mobile App Development, Mobile UX, Front-end Development, Mobile Apps, Mobile Applications, Crash Fixing
Experience
Equity Mobile Banking App
https://play.google.com/store/apps/details?id=ke.co.equitygroup.equitymobile&hl=en&gl=USA Kotlin-written Android app that provides complete control of the user's financial and lifestyle needs.
I was the team lead of one of the Android teams working on the project, and my responsibilities included:
• taking complete ownership of feature lifecycle,
• collaborating with the design and back-end teams,
• maintaining transparency towards the product team, and
• mentoring.
I was the team lead of one of the Android teams working on the project, and my responsibilities included:
• taking complete ownership of feature lifecycle,
• collaborating with the design and back-end teams,
• maintaining transparency towards the product team, and
• mentoring.
Cruise Automation
https://getcruise.comAn Android app aimed at being the interface between the client and a fleet of autonomous self-driving cars. I was tasked with expanding the feature set of the app, as well as bug-fixing. I worked in a fast-paced environment where I had to hit the ground running and produce high-quality code.
Android Assistant-like App
An assistant-like Android app aimed at providing the user with a means of recording important daily events by using speech-to-text. The user's location would also be captured in the background. Provided the entire app architecture as well as a proof-of-concept build.
Education
2000 - 2005
Bachelor's Degree in Computer Science
Politehnica University of Bucharest - Bucharest, Romania
Skills
Libraries/APIs
Retrofit, Firebase Android SDK, LiveData, Android Architecture Components, REST APIs, MockK, RxJava 2, Facebook API, X (formerly Twitter) API, Google Calendar API, RxJava, Google Location API, Camera2 API, Camera API, Google Maps SDK, Retrofit 2
Tools
Android Studio, WebView, Gradle, Slack, Jira, GitLab, Git, Firebase Cloud Messaging (FCM), Crashlytics, Jenkins, GitLab CI/CD, Visual Studio, IntelliJ IDEA, Android Jetpack, Android Auto, CircleCI, Sentry, Fastlane, GitHub
Languages
Kotlin, Java SE (Core Java), Java, C++, GraphQL
Frameworks
Android SDK, Glide, JUnit, Mockito, Dagger, Dagger 2, Espresso
Paradigms
Mobile Development, REST, Reactive Programming, Model View ViewModel (MVVM), Unit Testing, Clean Code, Clean Architecture, Functional Reactive Programming, Testing, B2C, Model View Intent (MVI)
Platforms
Android, Mobile, Windows, Firebase, Amazon Web Services (AWS), Linux, MacOS, Windows CE, Azure
Storage
SQLite, JSON
Other
Mobile UI, Mobile App Development, Mobile UX, Front-end Development, Jetpack Compose, Front-end, Android Development, Multithreading, Mobile Apps, Mobile Applications, Android App Design, API Integration, Crash Fixing, Coroutines, Teams, HTTP REST, Observer Pattern, Room, Android Architecture, APIs, Minimum Viable Product (MVP), Bluetooth, HTTP, Push Notifications, Authentication, User Interface (UI), User Experience (UX), Android Animations, eCommerce, OkHttp, Large-scale Projects, Consumer-facing Products, Widgets, Video Streaming, Algorithms, Image Processing, Data Structures, QR Codes, Speech Recognition, Speech-to-Text (STT), Encryption, UI Testing, Networking, A/B Testing, Online Payments
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