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Cláudio M., Android Engineer

Portugal
Last Updated: 14 Aug 2023

- 8+ years of experience with Android Development - 4+ years of experience with Kotlin - Upper-Intermediate English

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Android   8 yr.

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Ilya, Senior Android Engineer with WCAG experience

Poland
Last Updated: 28 Sep 2023

- Over 5 years of expertise as an Android developer specializing in Kotlin. Experienced in leading and collaborating with development teams to ensure successful project delivery. - Skilled in introducing new functionalities, transitioning projects from Java to Kotlin, and adhering to WCAG accessibility standards. - Proficient in software architecture, quality assurance, and agile methodologies. Also experienced in Java software engineering, web development, and instructional roles. - Comprehensive understanding of Android UI/UX principles, clean architecture, and a range of libraries and tools. - Solid proficiency in Java, Kotlin, RxJava, Coroutines, Android Jetpack, Firebase, REST APIs, and various development and debugging tools. - English proficiency at an upper-intermediate level. Available to start immediately.

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Java   6.5 yr.

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Kotlin   3.5 yr.

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Android   5.5 yr.

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Artem B., Android Software Engineer

Ukraine
Last Updated: 4 Jul 2023

- 5+ years of experience in Android Development - Experience in developing applications using Java, Kotlin, Dart - Excellent knowledge of OOP - Experience in using Software design patterns - Good logical thinking, self-learning, high level of responsibility - Responsible, hard-working, result-oriented, creative and communicable, team player - Good attention to details - Upper-Intermediate English

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Eugene P., Android Software Engineer

Vilnius, Lithuania
Last Updated: 13 Nov 2023

- Experienced Android Engineer with 7 years of commercial experience and a strong track record of delivering innovative and robust mobile applications. - Proficient in Kotlin and Java, with expertise in MVVM and MVP architectural patterns. - Skilled in refactoring and improving existing codebases, implementing new features - Extensive knowledge of integrating SDKs like Here Maps, Firebase, Glide, and Realm. - Has experience working on navigation and banking applications. - Upper-Intermediate English

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Java

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Kotlin

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Vladyslav V., Android Engineer

Lviv, Ukraine
Last Updated: 8 Aug 2023

- 7+ years of commercial experience in IT - Experience in developing applications using Java, Kotlin - Excellent knowledge in OOP - Experience in using Design patterns (MVP, MVVM) - Experience in using SQLite - Good logical thinking, hard-working, self-learning, result oriented - Good attention to details. - Upper-Intermediate English - Availability starting from 01/08/2023

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Android

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Kotlin

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Table of Contents

Soft skills of a Kotlin Coroutines Developer

Soft skills are essential for a Kotlin Coroutines Developer to excel in their role. These skills not only complement their technical expertise but also contribute to their overall effectiveness as professionals. Let’s explore the soft skills required at different levels of experience:

Junior

  • Effective Communication: Ability to articulate ideas clearly and actively listen to others.
  • Problem-solving: Capacity to identify and resolve issues efficiently.
  • Collaboration: Willingness to work in a team and contribute to collective goals.
  • Adaptability: Readiness to embrace change and learn new technologies.
  • Time Management: Skill to prioritize tasks and meet deadlines.

Middle

  • Leadership: Capability to guide and mentor junior team members.
  • Critical Thinking: Aptitude to analyze complex problems and make informed decisions.
  • Empathy: Capacity to understand and relate to the needs and perspectives of others.
  • Conflict Resolution: Ability to handle conflicts and reach mutually beneficial solutions.
  • Flexibility: Willingness to adapt to evolving project requirements.
  • Organizational Skills: Proficiency in managing multiple tasks and projects simultaneously.
  • Attention to Detail: Focus on accuracy and precision in work.

Senior

  • Strategic Thinking: Ability to envision long-term goals and plan accordingly.
  • Mentorship: Capacity to guide and develop junior and middle-level developers.
  • Decision-making: Aptitude to make critical decisions based on extensive knowledge and experience.
  • Negotiation: Skill to negotiate effectively with stakeholders and clients.
  • Project Management: Proficiency in overseeing complex projects and ensuring their successful completion.
  • Influence: Ability to persuade and inspire others to achieve desired outcomes.
  • Conflict Management: Skill to resolve conflicts and maintain a harmonious work environment.
  • Innovation: Readiness to explore new ideas and implement creative solutions.

Expert/Team Lead

  • Strategic Planning: Ability to develop and execute long-term strategies for the team and organization.
  • Team Management: Skill to lead and motivate a team towards achieving common goals.
  • Client Relationship Management: Proficiency in building and maintaining strong relationships with clients.
  • Business Acumen: Understanding of business objectives and ability to align technology solutions accordingly.
  • Risk Management: Aptitude to identify and mitigate potential risks in projects.
  • Continuous Learning: Commitment to staying updated with the latest industry trends and advancements.
  • Change Management: Skill to manage and navigate organizational changes effectively.
  • Conflict Resolution: Proficiency in handling conflicts and fostering a positive team dynamic.
  • Strategic Partnerships: Ability to establish and nurture partnerships with key stakeholders.
  • Presentation Skills: Proficiency in delivering impactful presentations to diverse audiences.
  • Emotional Intelligence: Capacity to understand and manage emotions, both personal and within the team.

How and where is Kotlin Coroutines used?

Case NameCase Description
Asynchronous ProgrammingKotlin Coroutines simplify asynchronous programming by providing a way to write asynchronous code in a sequential manner. It allows developers to write non-blocking code that looks like regular sequential code, making it easier to understand and maintain. Coroutines handle the complexity of managing threads and callbacks, resulting in cleaner and more readable code.
Concurrent OperationsKotlin Coroutines enable concurrent operations by allowing developers to easily launch multiple coroutines that can run concurrently. This is particularly useful when performing tasks such as parallel processing, handling multiple network requests, or performing computations concurrently. Coroutines provide built-in support for concurrent execution, improving the overall performance of the application.
Timeout HandlingKotlin Coroutines provide a straightforward way to handle timeouts. Developers can specify a timeout for a coroutine, and if the operation exceeds the specified time limit, it can be cancelled automatically. This feature is beneficial when dealing with network requests, where it’s essential to set a maximum time to wait for a response to prevent blocking the application.
Seamless Error HandlingCoroutines simplify error handling by providing structured exception handling mechanisms. Developers can easily handle exceptions within coroutines using try-catch blocks, making it easier to handle errors in a localized manner. This helps in writing robust and fault-tolerant code, improving the overall reliability of the application.
UI ThreadingWith Kotlin Coroutines, developers can easily switch execution contexts between background threads and the UI thread. This is particularly useful in Android development, where it’s necessary to perform certain operations on the UI thread, such as updating the user interface. Coroutines provide convenient methods to switch between threads without explicitly managing threads or handlers.
Database OperationsKotlin Coroutines simplify database operations by providing a clean and concise way to interact with databases. Developers can perform database queries asynchronously using coroutines, eliminating the need for callbacks or complex threading mechanisms. This results in more readable and maintainable code when working with databases.
Sequential WorkflowsCoroutines enable developers to write sequential workflows in a concise and readable manner. It allows for the execution of multiple tasks one after the other, making it easier to express complex workflows or business processes. Coroutines provide constructs such as suspending functions and coroutine scopes, which facilitate the design and implementation of sequential workflows.
TestingKotlin Coroutines provide excellent support for testing asynchronous code. Developers can write test cases for coroutines using the built-in testing utilities, such as runBlocking and TestCoroutineDispatcher. This enables comprehensive testing of asynchronous operations, including simulating delays, timeouts, and handling exceptions, ensuring the correctness of the code.
Network OperationsKotlin Coroutines simplify network operations by providing a convenient way to perform asynchronous HTTP requests and handle responses. Developers can leverage libraries like Retrofit, which offer coroutine support, to write concise and efficient code for network communication. Coroutines handle the underlying threading and synchronization, making network operations more manageable and less error-prone.
Background JobsKotlin Coroutines are well-suited for executing background jobs or periodic tasks. Developers can launch coroutines that run in the background and perform tasks such as data synchronization, periodic updates, or background computations. Coroutines provide mechanisms for handling cancellation, ensuring that background jobs can be stopped or interrupted when needed.

TOP 15 Facts about Kotlin Coroutines

  • Kotlin Coroutines are a language feature introduced in Kotlin 1.3 that provide a way to write asynchronous code in a more concise and readable manner.
  • Coroutines are based on cooperative multitasking, which means that they allow suspending the execution of a function without blocking the underlying thread.
  • Coroutines can be used to handle asynchronous operations such as network requests, file I/O, and database queries without the need for callbacks or nested code.
  • Kotlin Coroutines provide built-in support for structured concurrency, which makes it easier to manage and compose multiple asynchronous operations in a clean and organized way.
  • Coroutines can be used to perform complex asynchronous operations in a sequential and linear fashion, which simplifies the code and improves readability.
  • Kotlin Coroutines are fully interoperable with existing Java code, making it easy to integrate coroutines into existing projects and libraries.
  • Coroutines can be used to implement various concurrency patterns such as producer-consumer, parallel processing, and event-driven programming.
  • Kotlin Coroutines are lightweight and have a small overhead compared to traditional thread-based concurrency.
  • Coroutines provide built-in support for cancellation, allowing you to easily cancel ongoing operations and clean up resources.
  • Kotlin Coroutines have extensive support for error handling and exception propagation, making it easy to handle and recover from errors in asynchronous code.
  • Coroutines can be used with various dispatchers, which control the execution context of coroutines, such as running on the main thread, background thread, or custom thread pool.
  • Kotlin Coroutines provide a rich set of operators and utilities for working with asynchronous code, such as combining multiple asynchronous results, timeouts, and retrying operations.
  • Coroutines can be used with Kotlin Flow, a reactive streams-like API, to handle streams of asynchronous data in a more efficient and declarative way.
  • Kotlin Coroutines have gained widespread adoption in the Android development community due to their ability to simplify asynchronous programming and improve app performance.
  • Coroutines are actively maintained and developed by the Kotlin team, with regular updates and improvements being released.

Cases when Kotlin Coroutines does not work

  1. Kotlin Coroutines can have limitations when it comes to long-running CPU-bound tasks. Since Coroutines are designed for handling asynchronous operations, they are not well-suited for tasks that consume a significant amount of CPU resources without yielding control back to the caller. In such cases, using Kotlin Coroutines may result in blocking the main thread and negatively impact the performance of the application.
  2. When working with blocking I/O operations, Kotlin Coroutines may not be the best choice. Coroutines are optimized for non-blocking I/O operations, which allow the CPU to perform other tasks while waiting for I/O to complete. However, if you have a blocking I/O operation, such as reading from a file or making a synchronous network request, using Coroutines may not provide any significant benefits and could even introduce unnecessary complexity.
  3. If you are working with a codebase that heavily relies on callbacks or interfaces that are not coroutine-friendly, integrating Kotlin Coroutines may require significant refactoring. Coroutines work best when the entire codebase is designed with coroutines in mind. If you have a large codebase that heavily relies on callback-based APIs or interfaces, migrating to Coroutines may not be a straightforward task and could introduce additional complexity.
  4. When dealing with third-party libraries or frameworks that are not coroutine-friendly, integrating Kotlin Coroutines may not be a seamless process. If the library or framework does not provide coroutine support or has limited interoperability with Coroutines, you may need to resort to workarounds or use other concurrency frameworks to achieve your desired functionality.
  5. In some scenarios, using Kotlin Coroutines may not be necessary or overkill. If your application has simple, straightforward concurrency requirements, using Coroutines may introduce unnecessary complexity without providing any significant benefits. In such cases, simpler concurrency models like threads or Java’s Executor framework may be more suitable.

Let’s consider Difference between Junior, Middle, Senior, Expert/Team Lead developer roles.

Seniority NameYears of experienceResponsibilities and activitiesAverage salary (USD/year)
Junior Developer0-2 years– Assisting with basic programming tasks and bug fixes$50,000 – $70,000
Middle Developer2-5 years– Developing and maintaining software components$70,000 – $90,000
Senior Developer5-10 years– Leading development efforts for complex features$90,000 – $120,000
Expert/Team Lead Developer10+ years– Overseeing the entire development process and guiding the team$120,000+

TOP 10 Kotlin Coroutines Related Technologies

  • Kotlin

    Kotlin is a statically typed programming language that runs on the Java Virtual Machine (JVM). It is the official language for Android development and provides seamless interoperability with Java. Kotlin’s support for coroutines makes it a popular choice for writing asynchronous and concurrent code.

  • Coroutines

    Coroutines are a concurrency design pattern that allows developers to write asynchronous code in a sequential manner. Kotlin Coroutines provide a simple and efficient way to handle asynchronous operations, making it easier to write scalable and efficient code.

  • Android Jetpack

    Android Jetpack is a suite of libraries, tools, and architectural guidance provided by Google to help developers build high-quality Android apps. Jetpack includes libraries like LiveData and ViewModel that are designed to work seamlessly with Kotlin Coroutines, enabling developers to write reactive and asynchronous code.

  • Retrofit

    Retrofit is a popular type-safe HTTP client for Android and Java. It simplifies the process of making network requests by providing a clean and concise API. With Kotlin Coroutines, Retrofit can be used to perform asynchronous network operations and seamlessly integrate with other coroutines-based code.

  • Room Persistence Library

    Room is a powerful and lightweight library that provides an abstraction layer over SQLite database for Android apps. With Kotlin Coroutines, Room can be used to perform database operations asynchronously, allowing developers to write efficient and responsive data access code.

  • Ktor

    Ktor is a flexible and asynchronous web framework for Kotlin. It provides a simple and intuitive API for building web applications and services. With Kotlin Coroutines, Ktor can handle multiple concurrent requests efficiently, making it an excellent choice for building scalable and high-performance web applications.

  • Anko

    Anko is a Kotlin library that simplifies Android UI development. It provides a DSL (Domain-Specific Language) for creating UI components programmatically. With Kotlin Coroutines, Anko can be used to handle UI-related asynchronous tasks, such as updating UI elements in response to background computations.

What are top Kotlin Coroutines instruments and tools?

  • Kotlinx.coroutines: Kotlinx.coroutines is the official library for working with coroutines in Kotlin. It was introduced in 2017 and has since become the de facto standard for coroutine usage in Kotlin. It provides a rich set of functions and utilities for asynchronous programming, including support for structured concurrency and cancellation. Kotlinx.coroutines is widely used in production applications and has an active community of developers.
  • Flow: Flow is a reactive streams-like API introduced in Kotlin 1.4 along with Kotlinx.coroutines. It allows for the asynchronous processing of sequences of values and provides operators for transforming, filtering, and combining flows. Flow is designed to seamlessly integrate with Kotlin coroutines and is particularly useful for handling streams of data in a reactive manner.
  • CoroutineScope: CoroutineScope is a class provided by Kotlinx.coroutines that serves as a context for launching coroutines. It provides a structured way to manage the lifecycle of coroutines and allows for hierarchical structuring of coroutine execution. CoroutineScope is often used in conjunction with Android’s ViewModel or other lifecycle-aware components to ensure proper management of coroutines.
  • CoroutineContext: CoroutineContext is an interface in Kotlinx.coroutines that represents the context in which a coroutine is executed. It includes information such as the dispatcher that defines the thread or thread pool on which the coroutine runs, as well as other contextual elements. CoroutineContext allows for fine-grained control over coroutine execution and enables customization based on specific requirements.
  • Dispatchers: Dispatchers is a utility class provided by Kotlinx.coroutines that defines various dispatchers for coroutine execution. Dispatchers allow for specifying the thread or thread pool on which a coroutine should run. Some of the commonly used dispatchers include Dispatchers.Default for CPU-intensive tasks, Dispatchers.IO for IO-bound tasks, and Dispatchers.Main for running coroutines on the main thread in Android applications.
  • Channel: Channel is a communication primitive provided by Kotlinx.coroutines for passing data between coroutines in a producer-consumer fashion. It can be used to build efficient and scalable message passing systems or to implement complex communication patterns. Channels support both buffered and unbuffered modes, and they provide operations for sending and receiving values asynchronously.
  • StateFlow: StateFlow is a hot stream of state updates introduced in Kotlin 1.5 along with Kotlinx.coroutines. It is designed for managing state within an application and allows for observing and updating state in a reactive manner. StateFlow combines the benefits of Flow and shared mutable state, providing a convenient way to handle state changes in a reactive and efficient manner.
  • Coroutines Debugger: The Coroutines Debugger is a tool provided by Kotlinx.coroutines that helps with debugging coroutines. It allows for visualizing the execution of coroutines, inspecting their state, and analyzing their behavior. The debugger integrates with popular IDEs such as IntelliJ IDEA and provides a powerful set of features for troubleshooting and understanding the execution flow of coroutines.

Pros & cons of Kotlin Coroutines

8 Pros of Kotlin Coroutines

  • Asynchronous programming: Kotlin Coroutines provide a simple and efficient way to write asynchronous code. They allow you to perform long-running tasks without blocking the main thread, resulting in a more responsive and smoother user experience.
  • Concurrency: Coroutines make it easy to write concurrent code by abstracting away the complexities of thread management. They provide a higher-level abstraction that allows you to write code that looks sequential but can be executed concurrently.
  • Lightweight: Coroutines are very lightweight compared to traditional threads. They use fewer system resources and have a smaller memory footprint, which makes them more efficient in terms of performance.
  • Simplified error handling: Coroutines provide structured error handling through the use of try-catch blocks. This makes it easier to handle exceptions and propagate errors in asynchronous code.
  • Seamless integration with existing code: Kotlin Coroutines can be seamlessly integrated with existing codebases. They can be used alongside traditional blocking code, making it easy to migrate existing projects to use coroutines.
  • Low-level control: Coroutines provide fine-grained control over concurrency and scheduling. You can easily control the execution context and the number of concurrent operations, allowing you to optimize performance and resource usage.
  • Support for cancellation: Coroutines have built-in support for cancellation, allowing you to easily cancel long-running tasks. This helps in preventing resource leaks and managing the lifecycle of asynchronous operations.
  • Compatibility with other frameworks: Kotlin Coroutines are compatible with a wide range of frameworks and libraries, making it easy to integrate coroutines into your existing codebase and leverage the benefits they provide.

8 Cons of Kotlin Coroutines

  • Learning curve: Kotlin Coroutines have a learning curve, especially if you are new to asynchronous programming concepts. Understanding the concepts of suspending functions, dispatchers, and coroutine scopes may require some time and effort.
  • Debugging: Debugging code that uses coroutines can be more challenging compared to traditional synchronous code. The asynchronous nature of coroutines can make it harder to trace the flow of execution and identify issues.
  • Limited tooling support: While Kotlin Coroutines have gained popularity, the tooling support is still catching up. Some IDEs and development tools may not have full support for coroutines, which can make development and debugging more challenging.
  • Potential for callback hell: When used incorrectly, coroutines can lead to complex nesting of suspending functions, resulting in callback hell. It is important to design coroutines properly to avoid this issue.
  • Thread safety: Coroutines are not thread-safe by default. If you need to share mutable state between coroutines, you need to ensure proper synchronization to avoid data races and other concurrency issues.
  • Dependency management: If you are using coroutines in a project with complex dependency management, you may encounter challenges in resolving conflicting dependencies or ensuring compatibility with other libraries.
  • Backward compatibility: Kotlin Coroutines are part of the Kotlin standard library, which means they require Kotlin runtime support. If you are working on a project that needs to support older versions of Kotlin or Java, you may face compatibility issues.
  • Community support: While Kotlin Coroutines have a growing community, it may not be as extensive as some other programming paradigms or frameworks. Finding answers to specific issues or getting community support may be more challenging compared to more established technologies.

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