Andrei is available for hire

Andrei Istrate

Verified Expert in Engineering

Software Developer

Location

Cluj-Napoca, Cluj County, Romania

Toptal Member Since

March 15, 2022

Andrei is a senior mobile developer with over six years of experience building and maintaining robust mobile applications. He specializes in Android development and has a vast knowledge of the tools currently used for Android application development, including Java and Kotlin. Also, he has experience in working with cross-platform frameworks like Flutter.

Authentication Mobile App Development Google Play Store User Experience (UX)User Interface (UI)Debugging Push Notifications Android Android Studio Android SDK Mobile Gradle Object-oriented Programming (OOP)Java Agile QR Code Charles

Portfolio

Globant

Java, Kotlin, Flutter, Android NDK, Android, Charles, New Relic, Jira...

Fortech SRL

Java, Kotlin, Android, Android NDK, Jenkins, Continuous Integration (CI), SSL...

Wolfpack Digital SRL

Java, Kotlin, Android, Android NDK, Continuous Integration (CI), Jira...

Experience

Android - 7 years Agile - 6 years Databases - 6 years Java - 6 years Object-oriented Programming (OOP) - 6 years Firebase - 4 years Kotlin - 4 years Jira - 4 years

Availability

Part-time

Preferred Environment

MacOS, Windows, Mobile Development

The most amazing...

...project I've led as a lead Android developer provided aid for users with disabilities. The app is used in the train stations of London.

Work Experience

Senior Mobile Developer

2021 - 2022

Globant

Worked in a team specializing in support, performance, and observability by facilitating and providing software-based solutions for a leading digital product in the entertainment industry.
Enhanced the UI/UX and provided multiple video streaming performance upgrades.
Integrated third-party video streaming analytics software with multiple stream services custom components.
Resolved multiple Google Ads-related issues and reduced the application crash rate by providing custom analytics solutions.
Held multiple technical team introduction discussions related to cross-platform mobile technologies (Flutter).

Technologies: Java, Kotlin, Flutter, Android NDK, Android, Charles, New Relic, Jira, Confluence, Breadboarding, Firebase, ExoPlayer, RxJava 2, Dart, Test-driven Development (TDD), Integration Testing, Mobile Development, Android Studio, Unit Testing, Agile, Mobile App Development, Telecommunications, REST APIs, APIs, RxJava, Model View ViewModel (MVVM), Video Streaming, Mobile, Cross-platform, Android SDK, Gradle, Mobile Apps, Google Play Store, Coroutines, Android Jetpack, Continuous Integration (CI), Authentication, Push Notifications, User Experience (UX), User Interface (UI), Android Animations, Subscriptions, Debugging

Senior Mobile Developer

2020 - 2021

Fortech SRL

Led an Android mobile team on a leading digital product within the housing industry.
Provided multiple software-based solutions to improve the product's overall performance and decrease battery usage through multiple refactoring cycles. Battery consumption had an overall reduction of 35% while doing main flow app operations.
Implemented custom QR code scanner solutions and integrated them with multiple US delivery services.
Acted as a lead technical recruiter and conducted multiple technical interviews for Android-related positions.
Provided custom SSL (Secure Socket Layer) solutions for a mobile application in the military industry.
Developed a custom, offline, continuous integration process using Jenkins for a network restrictive product in the military industry.

Technologies: Java, Kotlin, Android, Android NDK, Jenkins, Continuous Integration (CI), SSL, SSL Certificates, Jira, RxJava, Agile, Mobile Development, Android Studio, Unit Testing, Mobile App Development, Telecommunications, Figma, REST APIs, Minimum Viable Product (MVP), Education, Flutter, Cloud Firestore, APIs, Model View ViewModel (MVVM), WebSockets, Video Streaming, MySQL, Mobile, Android SDK, Gradle, Mobile Apps, Firebase, Google Play Store, QR Codes, Coroutines, Android Jetpack, Integration Testing, Test-driven Development (TDD), RxJava 2, ExoPlayer, Breadboarding, Confluence, Authentication, Push Notifications, User Experience (UX), User Interface (UI), Android Animations, Subscriptions, Debugging

Mid Mobile Developer

2018 - 2020

Wolfpack Digital SRL

Acted as a team lead/developer and built two mobile applications that were a part of a digital product within the transportation industry meant to assist users with disabilities, notifying staff to support them with train onboarding.
Worked with real-time, client-server communication through WebSockets and Firebase Realtime Database. Created a custom chat feature that allowed users to share live locations via Mapbox.
Developed an app that provides an improved alternative for taking meeting notes. The app records meeting conversations and returns full transcripts of the entire conversation through IBM Watson AI.
Successfully migrated multiple Java-based Android projects to Kotlin and refactored entire app architectures from MVP to MVVM.
Improved an app's UI/UX and performance; also upgraded audio file data transfers by converting the audio files from an mp3 format to Ogg using FFmpeg.

Technologies: Java, Kotlin, Android, Android NDK, Continuous Integration (CI), Jira, Mobile Development, Android Studio, Unit Testing, Agile, Mobile App Development, SMS, Telecommunications, Figma, REST APIs, Minimum Viable Product (MVP), Education, Cloud Firestore, APIs, RxJava, Model View ViewModel (MVVM), WebSockets, MySQL, Mobile, Android SDK, Gradle, Mobile Apps, Spreadsheets, Microsoft Excel, Firebase, Google Play Store, QR Codes, Android Jetpack, Integration Testing, RxJava 2, Confluence, Authentication, Push Notifications, User Experience (UX), User Interface (UI), Android Animations, Subscriptions, Debugging

Mid Mobile Developer

2017 - 2018

Nordlogic Software

Provided software solutions for an app designed as a controller for a third-party camera. Applied multiple video editing techniques through FFmpeg libraries.
Built an application that displays all social events based on the user's location and preferences through communication with Facebook API. The app architecture was an MVP.
Created a presentation application for a popular Hollywood makeup artist. Provided custom views implementation to resemble iOS native UI components. Integrated the app with Spotify API, as well as third-party payment with Two Tap.

Technologies: Java, Android, Android NDK, Embedded Java, Mobile Development, Android Studio, Unit Testing, Agile, Mobile App Development, SMS, REST APIs, Minimum Viable Product (MVP), APIs, Model View ViewModel (MVVM), Bluetooth, MySQL, Mobile, Smart Devices, Android SDK, Mobile Apps, Microsoft Excel, Google Play Store, Authentication, User Experience (UX), User Interface (UI), Android Animations, Debugging

Junior Mobile Developer

2016 - 2017

ServUsTECH

Developed a mobile business management application using REST APIs, Android SDK components, and custom views.
Provided software solutions to improve UI/UX and increase application performance by minimizing memory leaks and battery usage on multiple applications.
Developed a social media mobile application using Geolocation, Maps API, and REST API. Refactored app architecture and improved UI/UX.

Technologies: Java, Android, Mobile Development, Android Studio, Mobile App Development, REST APIs, APIs, Bluetooth, Mobile, Android SDK, Mobile Apps, Microsoft Excel, Google Play Store, User Experience (UX), User Interface (UI), Debugging

Experience

Capturi

https://en.capturi.com/

Capturi is a Java-based Android app that increases meeting performance by providing an improved alternative to taking notes. The app would record a meeting conversation and through IBM's Watson AI was returning a full transcript with the entire conversation. I worked on improving application performance, fixing bugs, and handling result transcription real-time updates.

Cinefapp

https://play.google.com/store/apps/details?id=com.movie.cinefapp.cinef_app&gl=RO

An Android-based app for movie-related information. The app gives the ability to save all the movies a user wants to see and have a list of their favorite ones. Users can also stay up to date with upcoming movies and have a top list of the best ones.

This was a personal project, and I handled all levels of development, implementation, and design.

Sama | Spyfall

https://play.google.com/store/apps/details?id=com.spyfall.sama

A cross-platform game application developed in Flutter. The app is a great way to keep things interesting at parties and friends and family gatherings.
This was a personal project, and I worked alone on all stages of the product.

Skills

Languages

Java, Kotlin, Dart, C++

Frameworks

Android SDK, Flutter

Tools

Android Studio, Android Jetpack, Gradle, Android NDK, Jira, Jenkins, Charles, Confluence, ExoPlayer, Figma, Spreadsheets, MATLAB, Microsoft Excel

Paradigms

Class-based OOP, Object-oriented Programming (OOP), Agile, Mobile Development, Clean Architecture, Model View ViewModel (MVVM), Continuous Integration (CI), Test-driven Development (TDD), Unit Testing, Cross-platform

Platforms

Android, Mobile, Arduino, Firebase, MacOS, Windows, New Relic

Storage

Cloud Firestore, Databases, MySQL

Other

Push Notifications, Authentication, Mobile App Development, Minimum Viable Product (MVP), APIs, Mobile Apps, Google Play Store, User Experience (UX), User Interface (UI), Debugging, SSL, SSL Certificates, Breadboarding, Integration Testing, Coroutines, SMS, WebSockets, Bluetooth, Smart Devices, Internet of Things (IoT), QR Codes, Android Animations, Subscriptions, Electrical Engineering, Engineering, Data Structures, Embedded Java, Education, Video Streaming, Controls

Libraries/APIs

RxJava, RxJava 2, REST APIs

Industry Expertise

Telecommunications

Education

2012 - 2016

Bachelor's Degree in Mathematics and Computer Science

Technical University of Cluj Napoca - Cluj-Napoca, Romania

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