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Hristijan P., Android Technical Lead

Last Updated: 4 Aug 2023

- I am a self-taught Android developer with a passion for building scalable architecture and writing easily maintainable (deletable) code. - I am a big fan of DI frameworks like Dagger, Anvil, or Hilt. - I build apps out of passion outside of working hours, but lately, I have been exploring Ktor on the backend side and working on fully Compose Android applications. - From time to time, I also like to tinker with Figma. - I am passionate about the latest tech, hardware and security.

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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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Maksym B., Android Developer

Last Updated: 19 Oct 2023

- Over 7 years of commercial experience in IT as an Android Developer; - Proficient in Java and Kotlin programming languages; - Strong knowledge of Object-Oriented Programming (OOP) principles; - Experienced in using Design patterns such as MVP and MVVM; - Skilled in using Android SDK and various libraries/frameworks including RxJava, Jetpack Compose, Dagger, Hilt, Room, Navigation, Google Maps, Firebase Analytics, Firebase Crashlytics, and Firebase Cloud Messaging; - Familiar with Clean Architecture and Retrofit for building robust and scalable applications; - Proficient in using source control systems like GIT and tracking systems like Jira and Trello; - Experienced in Agile development methodologies such as SCRUM and Kanban; - Upper-Intermediate level of spoken and written English; - Successfully delivered projects in various domains including in-store and online shopping, retail and distribution, taxi services, sports, and job search; - Strong attention to detail, logical thinking, and result-oriented mindset.

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Android   7 yr.

Android SDK

Android SDK   7 yr.

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Taras Z., Android Developer

Warsaw, Poland
Last Updated: 30 Nov 2023

With over 8 years of expertise as an Android application developer, this engineer boasts a robust proficiency with Java, Kotlin, and C++. They have a strong foundation in computer science, having graduated with a specialist degree in Applied Mathematics. Accumulating experience through substantial roles in mid-level to senior, team-lead, and consulting positions, they have successfully executed more than seven long-term projects and numerous short-term engagements. Technical skills include Android SDK, Android NDK, Firebase, Retrofit2, and Dagger 2. They are adept in methodologies such as SDLC and employ engineering principles across different technologies and tools like Android Studio, Git, and Jira. Their noteworthy projects, like the multi-platform HBO GO and the financial service integration in PayKey, underline their capability to deliver complex applications, highlighting an extraordinary blend of technical acumen and practical experience.

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Java   8 yr.




Zend   8 yr.

Android APIs

Android APIs   8 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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Table of Contents

Hard skills of a Dagger2 Developer

As a Dagger2 Developer, having a strong set of hard skills is essential to excel in your role. Below, you will find the key hard skills required for Junior, Middle, Senior, and Expert/Team Lead levels:


  • Understanding of Dependency Injection: Familiarity with the concept of dependency injection and how it is implemented using Dagger2.
  • Basic Dagger2 Configuration: Ability to configure Dagger2 modules, components, and dependencies in a simple application.
  • Module Provisioning: Knowledge of how to provide dependencies using Dagger2 modules and annotations.
  • Component Injection: Understanding of how to inject dependencies into classes using Dagger2 components.
  • Scoping: Familiarity with scoping annotations in Dagger2, such as @Singleton and @ActivityScope, to manage the lifecycle of dependencies.


  • Advanced Dagger2 Configuration: Proficiency in configuring Dagger2 in complex applications with multiple modules and components.
  • Custom Scoping: Ability to create custom scoping annotations in Dagger2 to manage dependencies with specific lifecycles.
  • Subcomponents: Knowledge of using subcomponents in Dagger2 to create modular and reusable dependency graphs.
  • Component Dependencies: Understanding of how to define dependencies between Dagger2 components to share dependencies across different modules.
  • Lazy and Provider Injection: Familiarity with lazy and provider injection in Dagger2 for handling deferred or dynamic dependencies.
  • Advanced Module Setup: Ability to set up Dagger2 modules with complex dependencies, including conditional and dynamic bindings.
  • Testing with Dagger2: Proficiency in writing unit tests for Dagger2 components using test modules and mocking dependencies.


  • Optimizing Dagger2 Performance: Expertise in optimizing Dagger2 performance by reducing object graph size, minimizing component creation, and using compile-time optimizations.
  • Custom Component Processors: Ability to create custom annotation processors for Dagger2 to generate code based on custom annotations.
  • Advanced Scoping Strategies: Proficiency in designing and implementing advanced scoping strategies to manage complex dependency lifecycles.
  • Qualifiers and Multibinding: Knowledge of using qualifiers and multibinding in Dagger2 to differentiate between different implementations of the same dependency.
  • Gradle Plugin Integration: Familiarity with integrating Dagger2 with Gradle plugins, such as Dagger Hilt, to simplify configuration and enhance developer experience.
  • Performance Profiling: Understanding of using profiling tools to analyze Dagger2 performance and identify bottlenecks for optimization.
  • Debugging and Troubleshooting: Ability to debug and troubleshoot Dagger2-related issues, including circular dependencies, missing bindings, and component configuration errors.
  • Codebase Refactoring: Proficiency in refactoring codebases to migrate from other dependency injection frameworks to Dagger2, ensuring maintainability and performance.

Expert/Team Lead

  • Architectural Design: Expertise in designing scalable and maintainable architectures using Dagger2 as a core component of the dependency injection framework.
  • Code Review and Mentoring: Ability to review code and provide guidance to team members on best practices for using Dagger2 and implementing dependency injection.
  • Cross-Platform Integration: Knowledge of integrating Dagger2 with different platforms and frameworks, such as Android, Java, Kotlin, and Reactive frameworks.
  • Contributing to Dagger2: Familiarity with the Dagger2 open-source project and actively contributing to its development, bug fixing, and feature enhancement.
  • Performance Optimization Strategies: Expertise in implementing advanced performance optimization strategies in Dagger2, such as component reuse, object pooling, and lazy initialization.
  • Continuous Integration and Deployment: Proficiency in setting up continuous integration and deployment pipelines for Dagger2-based projects using tools like Jenkins, Travis CI, or GitLab CI/CD.
  • Advanced Dagger2 Extensions: Knowledge of advanced Dagger2 extensions, such as Dagger-Android, Dagger Assisted Injection, and Dagger-Reflect, to leverage additional features and capabilities.
  • Conference Speaking and Writing: Ability to share knowledge and expertise in Dagger2 by speaking at conferences, writing technical blog posts, and contributing to industry publications.
  • Application Performance Monitoring: Understanding of integrating Dagger2 with performance monitoring tools to track and analyze the performance of dependency injection in real-world applications.
  • Team Leadership: Proficiency in leading a team of developers working with Dagger2, providing guidance, mentoring, and driving best practices within the team.
  • Industry Recognition: Recognition as an industry expert in Dagger2, evidenced by contributions to the community, conference talks, awards, and publications.

Pros & cons of Dagger2

9 Pros of Dagger2

  • Compile-time dependency injection: Dagger2 performs dependency injection at compile time, which ensures that all dependencies are resolved and available before the application is run. This eliminates the risk of runtime errors and improves overall code reliability.
  • Modularity: Dagger2 promotes modular design by allowing developers to easily define and manage dependencies. This makes it easier to refactor and maintain code, as dependencies can be easily swapped or updated without affecting the entire application.
  • Efficiency: Dagger2 generates optimized code that minimizes runtime overhead. It uses code generation and static analysis to create a dependency injection graph, resulting in faster and more efficient execution compared to other dependency injection frameworks.
  • Type safety: Dagger2 leverages the power of Java’s type system to ensure type safety during dependency injection. It performs compile-time checks to ensure that the correct types are injected, reducing the risk of runtime errors and improving code robustness.
  • Scalability: Dagger2 supports scalable dependency injection by allowing developers to easily define and manage complex dependency graphs. This makes it suitable for large and modular applications where multiple components and dependencies need to be coordinated.
  • Testability: Dagger2 enhances testability by simplifying the process of mocking dependencies during unit testing. It allows developers to easily swap real dependencies with mock objects, enabling more comprehensive and reliable testing.
  • Code readability: Dagger2 promotes clean code practices by separating the concerns of dependency creation and dependency usage. This makes the code more readable and maintainable, as it clearly defines the dependencies and their relationships.
  • Community support: Dagger2 is backed by a large and active community of developers. This means that there are ample resources, tutorials, and examples available to help developers learn and use Dagger2 effectively.
  • Android integration: Dagger2 is widely used in the Android development community and has excellent integration with the Android framework. It provides annotations and tools specifically tailored for Android applications, making it a popular choice for dependency injection in Android projects.

9 Cons of Dagger2

  • Steep learning curve: Dagger2 has a steep learning curve, especially for developers who are new to dependency injection. It requires an understanding of advanced concepts such as annotations, code generation, and dependency injection principles.
  • Verbose setup: Setting up Dagger2 in a project can be time-consuming and require writing a significant amount of boilerplate code. This can be intimidating for developers, especially those working on smaller projects where simplicity is a priority.
  • Complex configuration: Dagger2’s configuration and setup can become complex as the size and complexity of the project increase. Managing multiple modules, components, and scopes can be challenging and may require additional effort to maintain and modify.
  • Limited runtime flexibility: Dagger2’s compile-time nature limits its runtime flexibility. Once the dependencies are resolved and the code is generated, it can be difficult to dynamically change or add dependencies at runtime.
  • Increased build time: Dagger2’s code generation process adds extra time to the build process, especially in larger projects. This can result in longer build times, which may impact developer productivity.
  • Debugging difficulties: Debugging Dagger2-related issues can be challenging, as the generated code can be complex and difficult to navigate. This can make it harder to track down and fix dependency injection-related bugs.
  • Dependency on code generation: Dagger2 heavily relies on code generation, which can make the build process more complex and introduce additional dependencies. This may lead to compatibility issues or conflicts with other libraries or tools used in the project.
  • Limited IDE support: While Dagger2 has good support in popular IDEs like Android Studio, the tooling and auto-completion features for Dagger2 are still evolving. This can make it more difficult for developers to write and understand Dagger2-related code.
  • Steep migration process: If an existing project wants to migrate to Dagger2, it can involve significant refactoring and changes to the codebase. This can be time-consuming and may require thorough testing to ensure the migration is successful and doesn’t introduce any regressions.

Soft skills of a Dagger2 Developer

Soft skills are essential for a Dagger2 Developer to excel in their role. These skills complement technical expertise and contribute to a developer’s overall effectiveness and success. Here are the soft skills required at different levels of experience:


  • Effective Communication: Ability to express ideas clearly and concisely, both verbally and in writing, to collaborate effectively within the team.
  • Problem-Solving: Aptitude for analyzing and resolving issues independently, demonstrating critical thinking skills.
  • Adaptability: Willingness to learn and adapt quickly to new technologies and frameworks, being open to feedback and continuous improvement.
  • Attention to Detail: Ability to pay close attention to code quality, ensuring clean and maintainable code.
  • Teamwork: Capacity to work collaboratively with team members, contribute to discussions, and support shared goals.


  • Leadership: Demonstrating leadership qualities by guiding and mentoring junior developers, providing technical guidance, and fostering a positive team environment.
  • Time Management: Efficiently managing workloads, prioritizing tasks, and meeting project deadlines.
  • Client Management: Developing strong relationships with clients, understanding their requirements, and effectively managing expectations.
  • Problem Solving: Developing advanced problem-solving skills, identifying complex issues, and providing innovative solutions.
  • Collaboration: Working effectively with cross-functional teams, promoting knowledge sharing and collaboration across different departments.
  • Decision Making: Making informed decisions based on analysis, considering various factors to achieve optimal outcomes.
  • Communication: Clear and concise communication with stakeholders, translating technical concepts into non-technical terms.


  • Mentorship: Mentoring and coaching junior and middle-level developers, transferring knowledge and fostering professional growth.
  • Strategic Thinking: Developing a broader perspective, aligning technical decisions with business goals, and contributing to strategic planning.
  • Conflict Resolution: Resolving conflicts within the team or with stakeholders, promoting healthy discussions and finding mutually beneficial solutions.
  • Innovation: Continuously exploring new technologies, frameworks, and methodologies, driving innovation within the development process.
  • Project Management: Demonstrating project management skills, effectively coordinating and leading development projects from initiation to delivery.
  • Empathy: Understanding the needs and perspectives of team members and stakeholders, demonstrating empathy and promoting a positive work environment.
  • Presentation Skills: Delivering engaging presentations and workshops, effectively conveying complex technical concepts to a non-technical audience.
  • Strategic Communication: Developing and implementing effective communication strategies for stakeholders at different levels.

Expert/Team Lead

  • Team Leadership: Leading and managing a team of developers, assigning tasks, providing guidance, and ensuring high-quality deliverables.
  • Technical Expertise: Demonstrating an in-depth understanding of Dagger2, its advanced features, and best practices.
  • Budget Management: Managing project budgets effectively, ensuring resource allocation and cost control.
  • Business Acumen: Understanding business objectives and aligning technical decisions to drive business value.
  • Collaboration with Stakeholders: Collaborating with stakeholders at all levels, including executives, to ensure transparency and alignment.
  • Continuous Learning: Continuously updating skills and staying abreast of industry trends, advocating for professional development within the team.
  • Quality Assurance: Implementing and championing quality assurance processes, including code reviews, testing, and documentation.
  • Strategic Planning: Developing long-term technical strategies and roadmaps, aligning them with organizational goals.
  • Risk Management: Identifying potential risks and developing mitigation strategies, ensuring project success.
  • Influencing Skills: Influencing decision-making at a higher level, using persuasive communication and negotiation skills.
  • Technical Architecture: Designing and implementing complex technical architectures, ensuring scalability, security, and performance.

TOP 12 Tech facts and history of creation and versions about Dagger2 Development

  • Dagger2 is a dependency injection framework for Java and Android, providing compile-time validation, increased performance, and easy-to-use APIs.
  • It was developed by Google and released in 2013 as a successor to Dagger, aiming to address its limitations and improve overall performance.
  • Dagger2 follows the annotation processing approach, allowing for automatic code generation and reducing the need for manual configuration.
  • The framework was created by a team of engineers at Google, led by Jesse Wilson, who is also known as the co-author of the OkHttp library.
  • One of the key features of Dagger2 is its ability to generate code at compile-time, resulting in faster execution and reduced runtime overhead.
  • Dagger2 introduced the concept of “Scopes,” enabling developers to define the lifespan of injected objects and manage their dependencies accordingly.
  • With Dagger2, developers can easily create modular applications by dividing the codebase into smaller, reusable components.
  • The framework leverages the power of Java’s annotation processing to analyze code and generate optimized dependency injection code.
  • Dagger2 utilizes a graph-based approach to dependency injection, where dependencies are represented as nodes, and their relationships are represented as edges.
  • One of the notable improvements in Dagger2 is the elimination of reflection, which was a major performance bottleneck in its predecessor Dagger.
  • Dagger2 supports a wide range of platforms, including Android, Java SE, Kotlin, and even JavaScript through its sibling library Dagger.js.
  • Since its release, Dagger2 has gained popularity among developers due to its performance, extensibility, and robustness in managing complex dependency graphs.

How and where is Dagger2 used?

Case NameCase Description
Dependency InjectionDagger2 is a powerful dependency injection framework that allows developers to manage dependencies in their code. It helps in separating the creation of objects from their usage, making the code more modular and easier to test. With Dagger2, developers can define dependencies and their dependencies’ dependencies, which are then automatically provided when needed.
ScalabilityDagger2 provides a scalable solution for managing dependencies in large-scale applications. It allows developers to define component hierarchies, where dependencies can be shared across different components. This enables the application to grow and change without introducing tight coupling between different parts of the codebase.
Android DevelopmentDagger2 is widely used in Android development to handle dependency injection. It helps in writing cleaner and more maintainable code by decoupling the creation and usage of objects. Dagger2’s compile-time dependency injection ensures that object dependencies are resolved at build time, reducing runtime overhead and improving performance.
TestingDagger2 simplifies unit testing by providing a way to easily mock dependencies. It allows developers to swap real dependencies with test-specific implementations, making it easier to isolate and test individual components of an application. This improves the overall testability of the codebase and helps in identifying and fixing issues early in the development cycle.
ModularityDagger2 promotes modularity by enforcing separation of concerns. By defining dependencies explicitly and injecting them where needed, the code becomes more modular and easier to understand. This helps in maintaining and extending the codebase, as changes in one module do not affect others unless explicitly specified.
Performance OptimizationDagger2’s compile-time generation of code eliminates the need for reflection, which can improve performance in certain scenarios. By generating optimized code at build time, Dagger2 reduces the overhead of runtime reflection-based dependency injection frameworks.
Third-Party Library IntegrationDagger2 seamlessly integrates with third-party libraries and frameworks, making it easy to incorporate dependency injection into existing projects. It provides annotations and tools that can be used to define and inject dependencies, ensuring compatibility with popular libraries and frameworks in the Java ecosystem.
Code MaintainabilityDagger2 promotes clean and maintainable code by enforcing a clear separation of concerns. By explicitly defining dependencies and their providers, it becomes easier to understand, modify, and extend the codebase. This improves the overall maintainability of the project, reducing the chances of introducing bugs or introducing unintended side effects.
ConcurrencyDagger2 supports concurrency by providing thread-safe dependency injection. It ensures that dependencies are injected correctly, even in multi-threaded environments. This helps in building robust and scalable applications that can handle concurrent access to shared resources.

TOP 10 Dagger2 Related Technologies

  • Java

    Java is the most popular programming language for Dagger2 software development. It is a versatile language known for its stability, performance, and large community support. With Java, developers can easily write clean and maintainable code for Dagger2 applications.

  • Kotlin

    Kotlin is another widely used language for Dagger2 development. It is a modern programming language that offers concise syntax, null safety, and seamless interoperability with Java. Kotlin’s compatibility with Dagger2 makes it a preferred choice for many developers.

  • Dagger2

    Dagger2 is a dependency injection framework for Java and Kotlin. It helps manage object dependencies and promotes modular and testable code. With Dagger2, developers can efficiently handle complex application dependencies and improve code maintainability.

  • Android Studio

    Android Studio is the official integrated development environment (IDE) for Android app development. It provides powerful tools and features, including seamless integration with Dagger2. Android Studio simplifies the process of Dagger2 setup and allows developers to easily manage dependencies in Android projects.

  • RxJava

    RxJava is a popular reactive programming library that complements Dagger2. It enables developers to write asynchronous and event-based code, making it easier to handle complex data flows in Dagger2 applications. RxJava’s combination with Dagger2 enhances the overall performance and responsiveness of the software.

  • Retrofit

    Retrofit is a widely used HTTP client library for Android and Java. It seamlessly integrates with Dagger2 and simplifies the process of making network requests. Retrofit’s compatibility with Dagger2 allows developers to manage network dependencies efficiently and build robust networking layers in their applications.

  • JUnit

    JUnit is a popular testing framework for Java and Kotlin. It plays a crucial role in ensuring the reliability and quality of Dagger2 software. With JUnit, developers can write unit tests to validate the behavior of Dagger2 components and ensure that the application functions as expected.

Cases when Dagger2 does not work

  1. Dagger2 does not work when there is a circular dependency in the dependency graph. Circular dependencies occur when two or more classes depend on each other directly or indirectly. Dagger2 relies on a directed acyclic graph (DAG) to resolve dependencies, and when a circular dependency is present, it breaks the acyclic nature of the graph, causing Dagger2 to fail in resolving the dependencies.
  2. Dagger2 does not work when the dependencies are not properly annotated. In order for Dagger2 to generate the necessary code for dependency injection, the dependencies need to be annotated with appropriate annotations such as @Inject, @Module, and @Component. If these annotations are missing or used incorrectly, Dagger2 will not be able to generate the required code, resulting in a failure to inject dependencies.
  3. Dagger2 does not work with non-static inner classes as dependencies. Dagger2 uses code generation to create the necessary injection code, and it requires the dependencies to be accessible at compile time. Non-static inner classes have an implicit reference to their enclosing class instance, which makes them non-static and non-final. This poses a challenge for Dagger2 as it cannot create instances of non-static inner classes directly. Therefore, using non-static inner classes as dependencies can cause Dagger2 to fail.
  4. Dagger2 does not work well with Android’s Activity and Fragment lifecycle. Dagger2 relies on the availability of the dependencies at the time of injection. However, Android’s Activity and Fragment lifecycle can be complex, with instances being created, destroyed, and recreated at various stages. This can lead to scenarios where the dependencies are not available when Dagger2 attempts to inject them, resulting in a failure.
  5. Dagger2 does not work when there are multiple components with conflicting scopes. Dagger2 allows the use of custom scopes to control the lifespan of dependencies. However, if multiple components with conflicting scopes are defined, Dagger2 may not be able to determine the correct scope for a given dependency, leading to a failure in resolving the dependencies.

What are top Dagger2 instruments and tools?

  • Dagger2: Dagger2 is a fast dependency injection framework for Java and Android. It was developed by Google and is a successor to Dagger 1. Dagger 2 generates code at compile time to create instances of classes that have been annotated with specific annotations. This helps to reduce boilerplate code and improve performance. It was first released in 2013 and has gained popularity among Android developers due to its efficiency and ease of use.
  • ButterKnife: ButterKnife is a view binding library for Android that simplifies the process of binding views to fields and methods. It is often used in conjunction with Dagger2 to inject dependencies into activities and fragments. ButterKnife uses annotations to generate boilerplate code that binds views to the corresponding fields or methods. It was created by Jake Wharton and released in 2013. ButterKnife has become a popular choice among Android developers for its simplicity and time-saving capabilities.
  • DaggerMock: DaggerMock is a testing library that provides a convenient way to mock dependencies when writing unit tests for code that uses Dagger 2. It allows developers to easily replace real dependencies with mock objects, making it easier to isolate and test specific parts of an application. DaggerMock was created by Konrad Kamiński and released in 2016. It has gained traction in the Android testing community for its ability to simplify the testing process for Dagger 2-based applications.
  • Android Studio: Android Studio is the official integrated development environment (IDE) for Android app development. It provides a range of tools and features that support Dagger 2 development, including code navigation, refactoring, and debugging capabilities. Android Studio has been the primary choice for Android developers since its initial release in 2013. It offers seamless integration with Dagger 2 and provides a user-friendly environment for building and testing Android applications.
  • Gradle: Gradle is a build automation tool used for Android app development. It allows developers to define and manage dependencies, including Dagger 2, within the build.gradle file of an Android project. Gradle offers a flexible and efficient way to handle project dependencies, making it easier to incorporate Dagger 2 into an Android application. It was first released in 2007 and has become the default build system for Android Studio.
  • Kotlin: Kotlin is a modern programming language that has gained popularity among Android developers. It provides seamless integration with Dagger 2 and offers features such as null safety and concise syntax, which can improve the development process. Kotlin was officially supported by Google for Android development in 2017. Its compatibility with Dagger 2 has made it a preferred choice for developers looking to leverage the benefits of both technologies.

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