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Ivan K., Android Software Engineer/Team Lead

Zaporizhia, Ukraine
Last Updated: 4 Jul 2023

- Android Software Engineer with 7 years of experience in native android development - 3+ years of team-leading experience - Upper-Intermediate English - Available ASAP

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Oleksandr T., Senior Android Engineer

Last Updated: 4 Jul 2023

- Senior Android Engineer with 6+ years of commercial experience and strong organizational skills. - Proficient in Android development using Java, Kotlin, and libraries like Retrofit and Room. - Expert in methodologies like MVC, MVVM, Clean Architecture, and SOLID principles. - Comfortable working with REST API, version control tools like Git, and project management through MVP. - Upper-Intermediate English - Available ASAP

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Android   6 yr.

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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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Oleksandr D., Android Engineer

Rivne, Ukraine
Last Updated: 4 Jul 2023

- Experienced Android Engineer with 6+ years in Java and Kotlin app development. - Proficient in Android development frameworks like Retrofit and Room (Android Jetpack). - Expertise in Clean Architecture, SOLID, MVVM principles, REST API, and HTTP. - Skilled in project management using Atlassian JIRA, Confluence, and Agile methodologies. - Upper intermediate English - Available ASAP

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Artem B., Android Software Engineer

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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Our journey starts with a 30-minute discovery call to explore your project challenges, technical needs, and team diversity. Meet Carefully Matched Koin Talents. Within 1-3 days, we’ll share profiles and connect you with the right talents for your project. Schedule a call to meet engineers in person. Validate Your Choice. Bring a new Koin developer on board with a trial period to confirm that you’ve hired the right one. There are no termination fees or hidden costs.

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Table of Contents

Hard skills of a Koin Developer

Hard skills of a Koin Developer:


  • Kotlin: Proficient in Kotlin programming language with knowledge of object-oriented programming principles.
  • Koin Basics: Familiarity with Koin framework and its core concepts like modules, scopes, and dependency injection.
  • Android Development: Basic understanding of Android app development and the Android framework.
  • Unit Testing: Ability to write and execute unit tests for Koin components and modules.
  • Debugging: Proficient in using debugging tools to identify and fix issues in Koin-based applications.


  • Advanced Kotlin: In-depth knowledge of Kotlin language features, including coroutines, collections, and higher-order functions.
  • Advanced Koin: Extensive experience in working with Koin, including advanced module configuration, custom scopes, and aspect-oriented programming.
  • Architecture Patterns: Familiarity with popular Android architecture patterns like MVVM or Clean Architecture and integrating Koin into these patterns.
  • Database Integration: Ability to integrate Koin with various database libraries like Room or Realm for data persistence.
  • API Integration: Proficiency in using Koin to handle API calls and integrate with networking libraries like Retrofit or OkHttp.
  • Performance Optimization: Knowledge of performance optimization techniques specific to Koin, such as lazy initialization and caching.
  • Error Handling: Ability to implement error handling strategies in Koin applications, including handling exceptions and displaying meaningful error messages.


  • Advanced Android Development: Extensive experience in Android app development, including advanced topics like custom views, animations, and background processing.
  • Dependency Graph Optimization: Proficiency in optimizing the dependency graph in Koin applications for better performance and maintainability.
  • Code Quality: Strong focus on writing clean, maintainable code with adherence to coding standards and best practices.
  • Testing Strategies: Ability to design and implement comprehensive testing strategies, including unit tests, integration tests, and UI tests.
  • Code Review: Experience in conducting and participating in code reviews to ensure code quality and adherence to project guidelines.
  • Continuous Integration: Familiarity with setting up and maintaining CI/CD pipelines for Koin-based projects using tools like Jenkins or GitLab CI.
  • Team Collaboration: Ability to collaborate effectively with cross-functional teams, including designers, product managers, and backend developers.

Expert/Team Lead

  • Architecture Design: Extensive experience in designing scalable and modular architectures using Koin, considering factors like code separation, modularity, and scalability.
  • Performance Tuning: Proficiency in identifying and resolving performance bottlenecks in Koin applications, including memory leaks and inefficient dependency injections.
  • Advanced Error Handling: Ability to design and implement advanced error handling strategies, including crash reporting, error monitoring, and recovery mechanisms.
  • Codebase Refactoring: Experience in refactoring large codebases to improve code structure, maintainability, and performance.
  • Codebase Documentation: Ability to document codebase architecture, design decisions, and best practices for seamless knowledge transfer and onboarding of new team members.
  • Mentorship: Experience in mentoring and guiding junior and middle-level developers in Koin development, providing technical leadership and support.
  • Project Management: Proficiency in project management tools and methodologies, ensuring timely delivery of high-quality Koin-based projects.
  • Technical Leadership: Ability to provide technical guidance and direction to the team, making informed decisions and driving technical excellence.
  • Community Involvement: Active participation in the Koin developer community, contributing to open-source projects, and sharing knowledge through blog posts and presentations.
  • Version Control: Proficiency in using version control systems like Git, including branching, merging, and resolving conflicts.
  • Deployment Strategies: Familiarity with different deployment strategies for Koin applications, including app store distribution, beta testing, and continuous deployment.

What are top Koin instruments and tools?

  • Koin Core: Koin Core is the primary library for building applications using the Koin dependency injection framework. It provides a lightweight and efficient way to handle dependency injection in Kotlin. Koin Core has been actively developed since 2017 and is widely used in the Kotlin community. It offers a simple and concise syntax for defining and resolving dependencies, making it a popular choice among developers.
  • Koin Android: Koin Android is an extension of Koin Core specifically designed for Android applications. It provides additional features and integrations that are essential for building Android apps with Koin. With Koin Android, developers can seamlessly integrate dependency injection into their Android projects, improving code organization and testability. It has been widely adopted by Android developers since its release.
  • Koin Test: Koin Test is a module that facilitates testing of applications built with Koin. It provides utilities and extensions to simplify the setup and execution of unit tests that involve dependencies managed by Koin. With Koin Test, developers can easily mock or replace dependencies during testing, enabling comprehensive and reliable testing of their applications. It has become an indispensable tool for developers following test-driven development practices.
  • Koin GraalVM: Koin GraalVM is an experimental module that aims to provide GraalVM compatibility for applications using Koin. GraalVM is a high-performance runtime that allows applications to be compiled ahead of time, resulting in faster startup times and reduced memory footprint. Koin GraalVM allows developers to leverage the benefits of GraalVM while using Koin as their dependency injection framework.
  • Koin Micronaut: Koin Micronaut is an integration module that allows developers to use Koin as the dependency injection framework in Micronaut applications. Micronaut is a modern, lightweight framework for building microservices and serverless applications. With Koin Micronaut, developers can leverage the simplicity and flexibility of Koin while benefiting from the powerful features of Micronaut.
  • Koin Reflect: Koin Reflect is an experimental module that explores the possibility of using reflection-based dependency injection with Koin. While Koin primarily relies on Kotlin’s type-safe DSL for dependency resolution, Koin Reflect aims to provide an alternative approach using reflection. This module is still in its early stages and not recommended for production use, but it offers an interesting avenue for developers to explore.

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

Seniority NameYears of experienceResponsibilities and activitiesAverage salary (USD/year)
Junior0-2 yearsAssisting senior developers in coding, debugging, and testing software applications. Learning new technologies and programming languages. Participating in code reviews and providing feedback. Collaborating with the team to deliver assigned tasks.$50,000 – $70,000
Middle3-5 yearsDeveloping and maintaining software applications independently. Designing and implementing new features. Troubleshooting and resolving technical issues. Mentoring junior developers. Collaborating with cross-functional teams. Participating in code refactoring and optimization.$70,000 – $90,000
Senior6-10 yearsLeading the development of complex software projects. Architecting scalable and efficient solutions. Mentoring and coaching junior and middle developers. Conducting code reviews and ensuring code quality. Collaborating with stakeholders to gather requirements and provide technical guidance. Resolving critical technical issues.$90,000 – $120,000
Expert/Team Lead10+ yearsLeading and managing a team of developers. Setting technical direction and strategy. Providing guidance on architectural decisions. Collaborating with product managers and stakeholders to define project scope and timelines. Mentoring and coaching team members. Resolving conflicts and ensuring smooth project execution.$120,000 – $150,000+

TOP 13 Tech facts and history of creation and versions about Koin Development

  • Koin is a lightweight Kotlin dependency injection framework that was first introduced in 2017.
  • It was created by the team at Insert-Koin.io, led by developer and entrepreneur Arnaud Giuliani.
  • Koin was developed as a simpler alternative to existing dependency injection frameworks, aiming to provide a hassle-free way to manage dependencies in Kotlin applications.
  • One of the key features of Koin is its ability to eliminate the need for complex XML or annotation-based configuration files, allowing developers to define dependencies directly in code.
  • Since its release, Koin has gained popularity among Kotlin developers due to its simplicity and ease of use.
  • Koin follows a functional programming approach, making heavy use of Kotlin’s language features such as lambdas and DSLs (Domain Specific Languages).
  • Unlike other dependency injection frameworks, Koin does not rely on reflection, resulting in faster startup times and improved performance.
  • Koin provides support for Android development, allowing developers to easily integrate dependency injection into their mobile applications.
  • With Koin, developers can easily define and resolve dependencies using a simple and intuitive DSL, making it ideal for small to medium-sized projects.
  • Koin supports both constructor injection and property injection, giving developers flexibility in how they manage dependencies.
  • Over the years, Koin has evolved and introduced new features to enhance its functionality, such as support for coroutines and multi-module projects.
  • As of 2021, Koin has reached version 3.0, with improvements in performance, modularity, and support for the latest versions of Kotlin and Android.
  • Koin has a vibrant community of developers who contribute to its development, provide support, and share their experiences through forums, blogs, and social media.
  • Being an open-source framework, Koin is constantly evolving and improving, driven by the feedback and contributions of its user community.

How and where is Koin used?

Case NameCase Description
1. Android Dependency InjectionKoin Development provides an efficient solution for implementing dependency injection in Android applications. With its lightweight and easy-to-use framework, developers can easily manage dependencies and improve the modularity of their code. Koin allows for the effective separation of concerns, making it easier to test and maintain Android applications.
2. Microservices ArchitectureKoin Development is well-suited for building microservices architectures. It provides a simple and lightweight dependency injection mechanism that allows developers to easily manage dependencies between microservices. The flexibility of Koin enables developers to quickly adapt and scale their microservices as per the requirements of their application.
3. Server-side DevelopmentKoin Development can be used for server-side development in various programming languages. It offers a straightforward approach to managing dependencies and facilitates the creation of modular and maintainable server-side applications. Developers can leverage Koin to enhance the performance and scalability of their server-side code.
4. Test AutomationKoin Development plays a crucial role in test automation by simplifying the process of managing dependencies in test cases. By using Koin, developers can easily mock dependencies and isolate components for unit testing. This enables more efficient and reliable testing, leading to higher quality software.
5. Web Application DevelopmentKoin Development can be utilized for web application development across different frameworks and languages. It provides a lightweight and flexible dependency injection mechanism that simplifies the creation of web applications. Developers can leverage Koin to enhance the modularity and maintainability of their web applications.
6. Reactive ProgrammingKoin Development integrates well with reactive programming frameworks and libraries. It supports dependency injection in reactive applications, allowing developers to easily manage dependencies and improve code organization. Koin enables developers to build scalable and responsive reactive applications with ease.
7. Command Line Interface (CLI) ToolsKoin Development can be utilized in the development of command line interface (CLI) tools. It offers a lightweight and efficient dependency injection mechanism that simplifies the creation of CLI applications. Developers can leverage Koin to enhance the extensibility and maintainability of their CLI tools.
8. Desktop Application DevelopmentKoin Development can be applied to desktop application development, providing a clean and modular approach to managing dependencies. It facilitates the creation of desktop applications that are easier to maintain, test, and extend. Developers can leverage Koin to enhance the user experience and performance of their desktop applications.
9. Internet of Things (IoT) ApplicationsKoin Development can be utilized in the development of Internet of Things (IoT) applications. With its lightweight and efficient framework, Koin enables developers to manage dependencies in IoT devices effectively. This results in more robust and scalable IoT applications.
10. Data Science and Machine LearningKoin Development can be applied in the field of data science and machine learning. It provides a flexible and scalable approach to managing dependencies in data-driven applications. Developers can leverage Koin to enhance the efficiency and reliability of their data science and machine learning workflows.

Cases when Koin does not work

  1. Koin does not work if the project is not set up correctly. It requires proper configuration and initialization in order to function properly. If the necessary dependencies and modules are not declared or if the Koin components are not properly integrated into the project, Koin may not work as expected.
  2. Koin may not work if there are conflicts or compatibility issues with other dependency injection frameworks or libraries used in the project. If there are clashes between Koin and other DI frameworks, it can lead to unexpected behavior and may result in Koin not functioning correctly.
  3. If the dependencies or modules used in the project have circular dependencies, Koin may struggle to resolve them. Circular dependencies can create a situation where Koin is unable to construct the necessary dependency graph, causing it to fail or produce incorrect results.
  4. Koin relies on reflection to provide its dependency injection capabilities. If the project is configured to disable or restrict reflection, Koin may not be able to function properly. In such cases, alternative approaches or modifications to the project configuration may be necessary to make Koin work.
  5. When using Koin in Android projects, it may not work correctly if the necessary lifecycle management is not implemented. Koin relies on the Android lifecycle to properly handle the creation and destruction of dependencies. If the lifecycle is not properly managed, it can lead to memory leaks or incorrect dependency resolution.
  6. If the project is using an outdated version of Koin, it may not work as expected. Koin is actively developed and new versions often introduce bug fixes, performance improvements, and additional features. It is important to keep the Koin version up to date to ensure optimal functionality.

Soft skills of a Koin Developer

Soft skills are an essential component of being a successful Koin Developer. These skills allow developers to effectively communicate, collaborate, and adapt to different situations, ultimately enhancing their ability to work in a team and deliver high-quality software solutions.


  • Problem-solving: Junior Koin Developers should possess strong problem-solving skills to analyze and resolve issues efficiently.
  • Communication: Effective communication skills are crucial for junior developers to convey their ideas and collaborate with team members.
  • Time management: Junior developers need to prioritize tasks and manage their time effectively to meet project deadlines.
  • Attention to detail: Paying attention to detail is important for junior developers to ensure the accuracy and quality of their code.
  • Adaptability: Junior Koin Developers should be adaptable to changes and willing to learn new technologies and frameworks.


  • Leadership: Middle Koin Developers should possess leadership skills to guide and mentor junior developers.
  • Teamwork: Collaborating effectively with team members and fostering a positive team environment is crucial for middle developers.
  • Problem-solving: Middle developers should have advanced problem-solving abilities to tackle complex technical challenges.
  • Decision-making: Making informed decisions and taking ownership of projects is essential for middle developers.
  • Critical thinking: Middle Koin Developers should exhibit strong critical thinking skills to evaluate and improve existing systems.
  • Conflict resolution: Resolving conflicts within the team and promoting a harmonious work environment is important for middle developers.
  • Client management: Middle developers should have the ability to communicate with clients and understand their requirements.


  • Mentoring: Senior Koin Developers should have the expertise to mentor and guide junior and middle developers.
  • Project management: Senior developers should possess project management skills to oversee the successful execution of complex projects.
  • Strategic thinking: Senior Koin Developers should think strategically to align technical solutions with business goals.
  • Innovation: Senior developers should be innovative and stay updated with the latest industry trends and advancements.
  • Collaboration: Collaborating with stakeholders, including clients and other teams, is crucial for senior developers.
  • Decision-making: Senior developers should make sound decisions based on their extensive experience and knowledge.
  • Quality assurance: Ensuring the quality and reliability of software solutions is a key responsibility of senior developers.
  • Continuous learning: Senior Koin Developers should have a thirst for continuous learning and professional development.

Expert/Team Lead

  • Team leadership: Expert/Team Lead developers should provide strong leadership to the development team.
  • Strategic planning: Developing strategic plans and roadmaps for software development initiatives is essential for expert/team lead developers.
  • Technical expertise: Expert/Team Lead developers should have advanced technical skills and knowledge of the Koin framework.
  • Communication: Expert/Team Lead developers should possess excellent communication skills to effectively liaise with stakeholders.
  • Project management: Expert/Team Lead developers should have extensive project management experience to ensure successful project delivery.
  • Decision-making: Making critical decisions and managing risks is a key responsibility of expert/team lead developers.
  • Influence and persuasion: Expert/Team Lead developers should possess the ability to influence and persuade stakeholders.
  • Conflict resolution: Resolving conflicts within the team and managing disagreements among stakeholders is important for expert/team lead developers.
  • Continuous improvement: Expert/Team Lead developers should drive continuous improvement initiatives within the development team.
  • Business acumen: Understanding the business context and aligning technical solutions with business objectives is crucial for expert/team lead developers.
  • Client management: Expert/Team Lead developers should have strong client management skills to build and maintain relationships with clients.

TOP 13 Facts about Koin

  • Koin is a lightweight dependency injection framework for Kotlin
  • It provides a simple and concise API for defining and resolving dependencies
  • Koin supports both constructor injection and property injection
  • It allows you to declare your dependencies using Kotlin DSL or annotation-based configuration
  • Koin is designed to be easy to use and understand, making it a great choice for beginners
  • It has a modular architecture, allowing you to easily split your application into separate modules
  • Koin provides seamless integration with popular frameworks and libraries such as Android, Spring, and Ktor
  • It offers a smooth migration path from other dependency injection frameworks like Dagger and Guice
  • Koin leverages the power of Kotlin language features such as extension functions and type-safe DSL
  • It focuses on simplicity and runtime performance, aiming to minimize the overhead typically associated with dependency injection
  • Koin offers advanced features like scoping, lazy resolution, and module overriding
  • It has a growing and active community, with regular updates and contributions from the open-source community
  • Koin is extensively tested and has a high code coverage, ensuring its reliability and stability

TOP 10 Koin Related Technologies

  • Python

    Python is a versatile and beginner-friendly programming language widely used in Koin software development. It offers a wide range of libraries and frameworks, making it efficient for web development, data analysis, and artificial intelligence projects.

  • JavaScript

    JavaScript is a crucial language for Koin software development as it is the backbone of web development. It enables interactivity and dynamic content on websites, making it essential for creating engaging user experiences.

  • React

    React is a popular JavaScript library used for building user interfaces. It allows developers to create reusable UI components, enabling efficient and scalable development of web applications.

  • Node.js

    Node.js is a runtime environment that allows developers to execute JavaScript code outside of a web browser. It is commonly used for server-side development, enabling efficient and scalable backend development for Koin software.

  • Java

    Java is a widely adopted programming language used for building enterprise-level applications. It offers strong support for object-oriented programming and provides a robust ecosystem of tools and frameworks for Koin software development.

  • Angular

    Angular is a TypeScript-based framework for building web applications. It provides a comprehensive set of features for building scalable and performant front-end applications, making it a popular choice for Koin software development.

  • SQL

    Structured Query Language (SQL) is a standard language for managing and manipulating relational databases. It is essential for storing and retrieving data in Koin software applications, ensuring efficient data management and retrieval.

Pros & cons of Koin

8 Pros of Koin

  • Lightweight: Koin is a lightweight dependency injection framework for Kotlin, which means it adds minimal overhead to your application.
  • Easy to Use: Koin has a simple and intuitive syntax, making it easy for developers to understand and use.
  • No Code Generation: Unlike some other dependency injection frameworks, Koin does not require any code generation or reflection, resulting in faster build times.
  • Testability: Koin makes it easy to write unit tests for your code by allowing you to easily mock and replace dependencies.
  • Modularity: Koin promotes modularity by allowing you to define and manage dependencies on a per-module basis.
  • Android Integration: Koin provides seamless integration with Android applications, including support for Android-specific components like ViewModels.
  • Performance: Koin is designed to be fast and efficient, with minimal runtime overhead.
  • Active Community: Koin has a growing and active community of developers who contribute to its development and provide support.

8 Cons of Koin

  • Limited Java Support: Koin is primarily designed for Kotlin projects, so if you are working on a Java project, you may encounter limitations or have to rely on workarounds.
  • Less Mature: Compared to some other dependency injection frameworks, Koin is relatively new and may not have all the features or extensive documentation that others offer.
  • Less Configuration Flexibility: While Koin offers simplicity, it may lack some of the advanced configuration options provided by other dependency injection frameworks.
  • Scope Limitations: Koin currently supports a limited set of scopes, which may not cover all the use cases you have in your application.
  • Learning Curve: If you are new to dependency injection, there may be a learning curve to understand how Koin works and how to effectively use it in your projects.
  • Less Community Support: While Koin has an active community, it may have less community support compared to more established dependency injection frameworks.
  • Compatibility: Depending on your project’s requirements, Koin’s compatibility with certain libraries or frameworks may be limited.
  • Documentation: While Koin has documentation available, it may not be as extensive or comprehensive as some other dependency injection frameworks.

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