Pavel is available for hire
Hire PavelPavel Kopytin
Verified Expert in Engineering
Mobile Developer
Auckland, New Zealand
Toptal member since July 22, 2020
Bio
Pavel is a creative developer with 20 years of software development experience who excels at building high-quality, useful mobile apps, especially for Android. When working on a project, Pavel is keen on establishing a solid app architecture from the get-go and adopting new technologies to maximize development efficiency and deliver innovative applications. Pavel also has a solid understanding of full mobile and software development lifecycles and can work independently and as part of a team.
Portfolio
Grab Holdings
Android Studio, Clean Architecture, Dagger 2, Figma, REST, Retrofit 2, Redux...
United Overseas Bank Limited | Singapore
Rx, Picasso, Retrofit, Kotlin, Java, Android, Firebase, Clean Architecture...
90 Seconds (Cloud Video Creation Platform) | Singapore
Rx, GraphQL, Apollo, Retrofit, Dagger 2, Kotlin, Android, Firebase...
Experience
- Android - 7 years
- Flutter - 5 years
- Java - 4 years
- Kotlin - 4 years
- Firebase - 3 years
- REST APIs - 2 years
- Dagger 2 - 2 years
- GraphQL - 1 year
Work Experience
Lead Android Engineer
2020 - 2023
Grab Holdings
- Designed and developed a brand new app in the digital banking area along with its own SDK.
- Configured the app's infrastructure for the whole development process, including setting up CI/CD pipelines, defining the Git flow, establishing the code style guidelines, and more.
- Worked closely with a cross-functional product, UI/UX team, and the back end.
Technologies: Android Studio, Clean Architecture, Dagger 2, Figma, REST, Retrofit 2, Redux, SDKs, Android, Architecture, Mobile, Mobile App Development, Mobile Apps, Android SDK, Jetpack Compose, Mobile Development, Technical Leadership, APIs
Squad Lead | Senior Android Software Engineer
2019 - 2020
United Overseas Bank Limited | Singapore
- Analyzed the legacy code and proposed steps for improvements.
- Increased the app reliability by increasing test coverage from 4% to 70%.
- Fixed 80% of the bugs and significantly increased the crash-free rate.
- Reduced the bug localization time by refactoring the legacy codebase.
- Increased transparency of the development process by helping the team to learn and apply Agile and Scrum methods.
- Completed the project and published it to Google Play.
Technologies: Rx, Picasso, Retrofit, Kotlin, Java, Android, Firebase, Clean Architecture, V-Key, RxJava, RxKotlin, KOIN, Android Studio, Mobile, Architecture, Mobile App Development, Mobile Apps, Android SDK, Mobile Development, Technical Leadership, APIs
Senior Android Software Engineer
2017 - 2019
90 Seconds (Cloud Video Creation Platform) | Singapore
- Increased the development speed by implementing an internal library of UI components and using them for user interface creation.
- Reduced the number of network requests from client apps and improved app reliability by migrating the API from RESTful to GraphQL.
- Reduced the build time by splitting the codebase into separate features and tool modules.
- Increased code reuse by combining all three apps into a single codebase with a multi-flavor architecture.
Technologies: Rx, GraphQL, Apollo, Retrofit, Dagger 2, Kotlin, Android, Firebase, Clean Architecture, ExoPlayer, RxJava, RxKotlin, Java, Android Studio, Mobile, Architecture, Mobile App Development, Mobile Apps, Cloud Firestore, Firebase Authentication, Firebase Cloud Messaging (FCM), Android SDK, Mobile Development, APIs
Lead Android Software Engineer
2015 - 2017
Healbe
- Improved the app quality and increased the crash-free rate to 99% by significantly refactoring the legacy codebase.
- Removed an incorrectly integrated EventBus framework which reduced bug localization time by 60%.
- Increased device connection stability by 80% by rewriting the core Bluetooth LE modules to the RxJava framework.
Technologies: Bluetooth Low Energy (LE), Rx, Retrofit, Java, Android, Firebase, Clean Architecture, RxJava, Android Studio, Mobile, Architecture, Mobile App Development, Mobile Apps, Android SDK, Mobile Development
Lead Software Engineer
2008 - 2015
CJSC TC Kuntsevo (Multi-brand Car Dealer and Service) | Moscow, Russia
- Improved collaborative work within the team by designing and implementing a single code style.
- Implemented sales funnel and CRM modules, which increased client retention by 25%.
- Reduced costs of warehouses by 10% by implementing an exchange difference module.
- Increased the number of users (300+) by migrating the whole server part (1,000+ stored procedures) from Firebird to Oracle.
Technologies: SQL, Oracle, Firebird, Delphi, PL/SQL, Architecture, ERP Building
Lead Software Engineer
2006 - 2008
OJSC Ansoft Integrator (ERP System Development) | Moscow, Russia
- Reduced the time to create custom configurations by 30% by creating a new configurator app for the product from scratch.
- Increased product reliability and reduced bug localization time by 15% by significantly improving a client app's architecture and code style.
- Improved product features such as search forms, reports, libraries, and documents and improved customer satisfaction by 40%.
- Helped to make more than ten sales by developing client configurations.
Technologies: SQL, Firebird, Delphi, Clean, Architecture, ERP Building
Project History
Weather App for Android
An Android app for weather forecasting styled as Pip-Boy from the famous game Fallout. It uses Openweathermap.org/ to get the data. This app gives you a forecast for 16 days ahead! It can provide weather information for many cities in either Celsius or Fahrenheit.
Portmone
Portmone is a simple app to manage your personal or family budget. It helps you to keep a record of all your incomes and expenses, analyze it, make plans, and make conclusions, and just be generally aware of your financial situation.
You don't need to be an accountant to work with it. Friendly UI helps you to learn the app quickly. The data input takes only a couple of minutes a day, so you can start fast, stay focused on your totals, and not get distracted by the small stuff.
You don't need to be an accountant to work with it. Friendly UI helps you to learn the app quickly. The data input takes only a couple of minutes a day, so you can start fast, stay focused on your totals, and not get distracted by the small stuff.
Education
1995 - 2000
Bachelor's Degree in Applied Mathematics and Mechanics
Voronezh State University - Voronezh, Russia
Certifications
JANUARY 2015 - PRESENT
Android Fundamentals
GDG Moscow (Russia)
MAY 2010 - PRESENT
ANSI SQL
Academy Velesa Certified
MAY 2010 - PRESENT
Delphi Programming
Academy Velesa Certified
Skills
Libraries/APIs
REST APIs, Retrofit, Picasso, Retrofit 2, RxJava, RxKotlin
Tools
Android Studio, Firebase Authentication, Firebase Cloud Messaging (FCM), Slack, Figma, Sublime Text, ExoPlayer
Languages
Delphi, Kotlin, SQL, Java, GraphQL, Dart, Clean
Frameworks
Flutter, Dagger 2, Rx, Dagger, Android SDK, Redux, KOIN
Paradigms
Clean Architecture, REST, Mobile Development
Platforms
Android, Firebase, Mobile, Bluetooth Low Energy (LE), Visual Studio Code (VS Code), MacOS, Oracle
Storage
Cloud Firestore, Firebird, PL/SQL
Other
Mobile App Development, Mobile Apps, APIs, Apollo, SDKs, Cross-platform App Development, Jetpack Compose, Technical Leadership, ERP Building, Bluetooth, V-Key, Architecture
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