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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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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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Vlad P., Senior Android Engineer

Last Updated: 8 Aug 2023

- As an accomplished Android Engineer with six years of experience, I have a proven track record of developing high-quality Android applications. My passion lies in diving deep into the core development of a project and leaving my technical mark. I am eager to keep pace with the rapidly changing mobile world, and I embrace challenges with enthusiasm - My journey as a Software Engineer began during high school, and I have continued to grow and develop my skills ever since. I am dedicated to working hard and driving innovation in all of my projects. I am also a personable and friendly team player, and I thrive on the opportunity to collaborate with others and meet new people - Overall, I am committed to delivering exceptional results and making a positive impact on any project I work on - Upper-Intermediate English

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Dennis S., SDET/Automation QA Engineer (Java)

Kharkiv, Ukraine
Last Updated: 4 Jul 2023

- 3.5+ Years of software testing experience - WEB UI Automated Testing - API Automated Testing (SOAP / RESTful / WebSocket ) - Software Development Engineer in Test / Quality Assurance / CI&CD starter. - Intermediate English - Available ASAP

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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 okHttp 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 okHttp 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

Soft skills of a okHttp Developer

Soft skills are essential for a successful career as an okHttp Developer. These skills complement technical expertise and enable developers to collaborate effectively, communicate clearly, and contribute to the overall success of their projects. Here are the soft skills required at different levels of experience:


  • Adaptability: Ability to quickly learn new technologies and adapt to changing project requirements.
  • Problem-solving: Aptitude for identifying and resolving issues in code and project implementation.
  • Teamwork: Willingness to work collaboratively with team members and assist in achieving project goals.
  • Communication: Good verbal and written communication skills to effectively convey ideas and updates to team members.
  • Time management: Ability to prioritize tasks, meet deadlines, and manage time efficiently.


  • Leadership: Capability to take ownership of tasks and guide junior team members in their work.
  • Critical thinking: Proficiency in analyzing problems and proposing innovative solutions.
  • Conflict resolution: Skill in resolving conflicts and fostering positive working relationships within the team.
  • Project management: Ability to plan, organize, and manage projects effectively.
  • Mentoring: Willingness to mentor junior developers and provide guidance in their professional growth.
  • Attention to detail: Keen eye for detail to ensure code quality and project accuracy.
  • Collaboration: Strong collaboration skills to work seamlessly with cross-functional teams.


  • Strategic thinking: Capability to align technical decisions with business objectives and long-term goals.
  • Decision-making: Proficiency in making informed decisions based on thorough analysis and evaluation.
  • Innovation: Ability to introduce new ideas, technologies, and approaches to improve development processes.
  • Presentation skills: Confidence in presenting technical concepts and project updates to stakeholders.
  • Client management: Skill in managing client expectations and providing excellent customer service.
  • Delegation: Capability to delegate tasks effectively and empower team members to take ownership.
  • Continuous learning: Commitment to staying updated with the latest technologies and industry trends.
  • Emotional intelligence: Ability to understand and manage emotions to foster a positive work environment.

Expert/Team Lead

  • Strategic planning: Proficiency in creating and executing long-term technical strategies for the team.
  • Team management: Skill in leading and motivating a team of developers to achieve project success.
  • Conflict management: Expertise in resolving conflicts and addressing team dynamics effectively.
  • Business acumen: Understanding of business operations to align technical decisions with organizational goals.
  • Influence and negotiation: Capability to influence stakeholders and negotiate project requirements.
  • Risk management: Ability to identify and mitigate risks associated with project delivery.
  • Quality assurance: Knowledge of quality assurance processes to ensure project deliverables meet high standards.
  • Strategic partnerships: Ability to build and maintain strategic partnerships with clients and vendors.
  • In-depth expertise: Extensive knowledge and expertise in okHttp and related technologies.
  • Thought leadership: Capability to contribute to the development community through publications, speaking engagements, etc.
  • Continuous improvement: Commitment to continuously improving processes, methodologies, and team performance.

TOP 15 Tech facts and history of creation and versions about okHttp Development

  • OkHttp is an open-source HTTP client for Java and Android. It was created in 2012 by Jesse Wilson, a software engineer at Square, Inc.
  • OkHttp is built on top of the Java’s HttpURLConnection and Apache HttpClient libraries, providing a simpler and more efficient API.
  • OkHttp uses a modern and asynchronous approach to handle network requests, allowing developers to make efficient use of system resources.
  • One of the groundbreaking features of OkHttp is its support for HTTP/2, which enables faster and more efficient communication between clients and servers.
  • OkHttp supports both synchronous and asynchronous request execution, giving developers flexibility in handling network operations.
  • In 2015, OkHttp became the default HTTP client for Android, replacing the deprecated Apache HttpClient.
  • OkHttp has built-in support for caching, which helps reduce network traffic and improves the performance of web applications.
  • OkHttp’s connection pooling feature allows multiple requests to share the same socket, reducing latency and improving efficiency.
  • OkHttp provides transparent support for handling HTTP redirects, making it easier for developers to handle server-side redirects.
  • OkHttp includes a powerful interceptor system, allowing developers to modify and inspect HTTP requests and responses.
  • OkHttp has a small footprint and is optimized for performance, making it a popular choice among developers for handling network operations.
  • OkHttp provides seamless integration with popular libraries like Retrofit, making it easier to build robust and scalable network applications.
  • OkHttp is actively maintained and regularly updated to support the latest standards and protocols in the world of web development.
  • OkHttp has a vibrant and supportive community, with extensive documentation and a dedicated GitHub repository for bug reports and feature requests.
  • OkHttp has been widely adopted by major companies and organizations, including Google, Square, and many others.
  • OkHttp has received numerous accolades and awards for its performance, simplicity, and reliability in handling HTTP requests.

What are top okHttp instruments and tools?

  • OkHttp: OkHttp is an open-source HTTP client for Java, Kotlin, and Android. It was developed by Square, a well-known technology company, and was first released in 2013. OkHttp is widely used in various applications and frameworks due to its simplicity, efficiency, and extensive feature set. It supports HTTP/2, SPDY, and WebSocket protocols, as well as connection pooling, transparent response caching, and automatic retries. With its easy-to-use API, OkHttp simplifies the process of making HTTP requests and handling responses.
  • Charles Proxy: Charles Proxy is a powerful HTTP debugging proxy server that allows developers to inspect and analyze HTTP and SSL/TLS traffic. It can be used in conjunction with OkHttp to intercept and view HTTP requests and responses in real-time. Charles Proxy provides valuable insights into network traffic, allowing developers to identify and diagnose issues such as incorrect headers, slow responses, or malformed requests. It supports various platforms, including Windows, macOS, and Linux, and has been widely adopted by developers and testers worldwide.
  • Stetho: Stetho is a debugging bridge for Android applications developed by Facebook. It integrates with OkHttp and provides a wealth of tools and features for debugging network traffic in Android apps. Stetho enables developers to inspect and visualize network requests, view response bodies, and monitor WebSocket connections. It also offers a JavaScript console for executing commands in the context of the application’s WebView. Stetho is highly regarded for its user-friendly interface and seamless integration with OkHttp, making it a popular choice for Android developers.
  • WireMock: WireMock is a flexible library for stubbing and mocking HTTP services. It can be used alongside OkHttp to create virtual HTTP servers that simulate specific responses or scenarios. WireMock allows developers to define custom responses, delay responses, and verify incoming requests. This tool is particularly useful for testing applications that rely on external HTTP services, as it eliminates dependencies on the actual services and enables developers to control and replicate different scenarios with ease.
  • Postman: Postman is a popular API development and testing tool that supports OkHttp. It provides a comprehensive suite of features for creating, testing, and documenting APIs. With Postman, developers can easily send HTTP requests, inspect and validate responses, and create automated tests for their APIs. Postman’s robust collection of tools and integrations, coupled with its user-friendly interface, have made it a go-to choice for developers and API enthusiasts worldwide.
  • P

    Pros & cons of okHttp

    8 Pros of okHttp

    • 1. Performance: okHttp is highly optimized for performance, making it one of the fastest and most efficient HTTP clients available. It uses a modern and asynchronous approach, allowing for faster and more streamlined network communication.
    • 2. Flexibility: okHttp provides a wide range of features and options, allowing developers to customize and configure the client based on their specific needs. It supports various protocols and can handle complex scenarios such as caching, redirects, and authentication.
    • 3. Easy Integration: okHttp can be easily integrated into any Java or Kotlin project. It provides a simple and intuitive API, making it straightforward to send HTTP requests, handle responses, and interact with the server.
    • 4. Connection Pooling: okHttp automatically manages and reuses HTTP connections, reducing the overhead of establishing new connections for each request. This improves the overall performance and efficiency of network operations.
    • 5. WebSocket Support: okHttp includes built-in support for WebSocket, allowing developers to establish real-time bidirectional communication with a server. This feature is particularly useful for applications that require instant updates or live data streaming.
    • 6. Caching: okHttp supports caching of both responses and requests, enabling offline access to previously fetched data. This can significantly improve the user experience by reducing network traffic and latency.
    • 7. Interceptors: okHttp provides a powerful interceptor mechanism that allows developers to modify and inspect HTTP requests and responses. Interceptors can be used for various purposes, such as logging, authentication, or adding custom headers.
    • 8. Active Development: okHttp is actively maintained and developed by a dedicated team at Square, ensuring that it stays up-to-date with the latest standards and best practices in web communication.

    8 Cons of okHttp

    • 1. Learning Curve: While okHttp offers a comprehensive set of features, it may have a steeper learning curve for developers who are new to HTTP clients or asynchronous programming. Some advanced features and concepts may require additional time and effort to fully grasp.
    • 2. Java Dependency: okHttp is primarily targeted towards Java and Kotlin developers, which means it may not be as suitable for projects written in other programming languages. This can limit its adoption in certain environments or frameworks.
    • 3. Lack of Official Android Support: Although okHttp is widely used in Android development, it is not officially endorsed or supported by the Android team. This means that developers may need to rely on community resources or third-party libraries for specific Android-related features or integration.
    • 4. Limited Browser Compatibility: While okHttp is a powerful HTTP client, it may not have the same level of compatibility or support as web browsers. This can be a concern if the application relies heavily on browser-specific features or behaviors.
    • 5. Lack of Native WebSocket Support in Android: Although okHttp supports WebSocket, the Android platform itself does not provide native WebSocket support. This can lead to additional complexity when working with WebSocket in an Android application using okHttp.
    • 6. Resource Consumption: Due to its powerful features and flexibility, okHttp may consume more system resources compared to simpler HTTP clients. This can be a concern in resource-constrained environments or on devices with limited capabilities.
    • 7. Possible Overkill for Simple Use Cases: For simple HTTP operations, okHttp may be considered overkill due to its extensive feature set and complexity. In such cases, a more lightweight HTTP client library or framework might be a better fit.
    • 8. Dependency Management: okHttp has its own set of dependencies, which need to be managed and updated along with the library itself. This can introduce additional complexity and potential conflicts in the project’s dependency management.

    Hard skills of a okHttp Developer

    Hard skills of an OkHttp Developer:


    • Java Programming: Proficient in writing Java code and understanding object-oriented programming concepts.
    • RESTful APIs: Knowledge of how to consume and interact with RESTful APIs using OkHttp library.
    • HTTP Protocol: Understanding of HTTP methods, status codes, headers, and request/response structure.
    • Error Handling: Ability to handle and manage errors and exceptions that may occur during network requests.
    • JSON Parsing: Experience in parsing JSON data received from API responses.


    • Asynchronous Programming: Proficiency in writing asynchronous code using callbacks, futures, or RxJava with OkHttp.
    • Network Caching: Knowledge of implementing network caching strategies to improve performance and reduce bandwidth usage.
    • Authentication and Authorization: Experience in implementing authentication and authorization mechanisms using OkHttp.
    • SSL/TLS: Understanding of SSL/TLS protocols and ability to configure secure connections with OkHttp.
    • Unit Testing: Experience in writing unit tests for OkHttp client code to ensure functionality and prevent regressions.
    • Performance Optimization: Ability to optimize network requests for improved speed and efficiency.
    • Debugging and Logging: Proficient in using debugging and logging tools to troubleshoot network-related issues.


    • Connection Pooling: Knowledge of connection pooling techniques to efficiently reuse TCP connections with OkHttp.
    • Interceptors: Experience in using OkHttp interceptors for request/response manipulation and logging.
    • Streaming: Proficiency in handling large file uploads/downloads and streaming responses with OkHttp.
    • Network Security: Understanding of secure coding practices and ability to implement secure network communication with OkHttp.
    • Load Testing: Experience in conducting load testing and performance profiling of OkHttp client applications.
    • Concurrency and Threading: Ability to handle concurrent network requests and manage threading with OkHttp.
    • Customization and Extensibility: Knowledge of extending OkHttp functionality through custom interceptors, connection pools, and other components.
    • Code Review and Mentorship: Ability to review code and provide guidance to junior developers, promoting best practices and code quality.

    Expert/Team Lead

    • Advanced Networking Concepts: In-depth understanding of TCP/IP, DNS, proxies, load balancers, and other networking concepts.
    • Distributed Systems: Experience in building distributed systems and handling complex network architectures.
    • Performance Tuning: Proficiency in fine-tuning OkHttp client applications for optimal performance and scalability.
    • API Design: Ability to design and architect well-structured and maintainable APIs for OkHttp client libraries.
    • Security Auditing: Knowledge of security auditing practices and ability to identify and address vulnerabilities in OkHttp client applications.
    • DevOps and CI/CD: Experience in integrating OkHttp client applications into continuous integration and deployment pipelines.
    • Technical Leadership: Ability to lead and mentor a team of developers, providing technical guidance and overseeing project execution.
    • Contributions to Open Source: Active involvement in the OkHttp community and contributions to the open-source project.
    • Problem Solving and Troubleshooting: Proficient in analyzing and resolving complex network-related issues and edge cases.
    • Performance Testing and Benchmarking: Experience in conducting performance testing and benchmarking of OkHttp client applications.
    • API Versioning and Compatibility: Understanding of API versioning strategies and handling backward compatibility in OkHttp client applications.

    TOP 10 okHttp Related Technologies

    • Java

      Java is a widely-used programming language in the software development industry. It offers a robust and secure environment for building applications. With its rich libraries and frameworks, Java provides developers with the necessary tools to create feature-rich applications.

    • Kotlin

      Kotlin is a modern programming language that runs on the Java Virtual Machine (JVM). It offers a more concise syntax and reduces boilerplate code, making it easier and faster to write code. Kotlin seamlessly integrates with Java, allowing developers to leverage existing Java libraries and frameworks.

    • Spring Framework

      The Spring Framework is a popular Java framework that provides comprehensive infrastructure support for developing Java applications. It offers features such as dependency injection, aspect-oriented programming, and MVC architecture, making it easier to build scalable and maintainable applications.

    • Android Development

      Android Development is a specialized field that focuses on building applications for the Android operating system. With the use of Java or Kotlin, developers can leverage the Android SDK and libraries to create mobile apps with rich functionality and seamless user experiences.

    • RESTful APIs

      RESTful APIs (Representational State Transfer) are widely used in modern web development. They provide a standardized way of building web services that can be consumed by various clients. OkHttp is a popular library for making HTTP requests and handling RESTful APIs in Java and Kotlin applications.

    • JSON

      JSON (JavaScript Object Notation) is a lightweight data interchange format commonly used in web services and APIs. It is easy to read and write, making it popular for data serialization. OkHttp provides built-in support for JSON parsing, making it convenient for developers to work with JSON data.

    • Gradle

      Gradle is a build automation tool widely used in the Java and Android development ecosystems. It allows developers to define and manage dependencies, build configurations, and tasks in a declarative manner. OkHttp can be easily integrated into Gradle projects, simplifying the dependency management process.

    How and where is okHttp used?

    Case NameCase Description
    Case 1: Network RequestsokHttp is widely used for making network requests in Android applications. It provides a simple and efficient way to send HTTP requests and receive responses from remote servers. Developers can easily handle various HTTP methods, set custom headers, and handle cookies using okHttp. It also supports features like connection pooling, response caching, and automatic retry, making it a popular choice for network communication in mobile apps.
    Case 2: Image LoadingokHttp can be used for efficient image loading in Android applications. It offers features like request prioritization, disk caching, and memory management, which are essential for loading images from remote servers. With the help of okHttp, developers can easily implement image loading libraries or integrate with existing libraries like Picasso or Glide to enhance the performance and user experience of image-heavy applications.
    Case 3: AuthenticationokHttp provides robust support for various authentication mechanisms, including basic authentication, digest authentication, and OAuth. It allows developers to seamlessly handle authentication challenges during network requests, making it easier to implement secure communication between the client and server. Whether it’s authenticating API requests or handling user login sessions, okHttp simplifies the authentication process and ensures secure data transmission.
    Case 4: WebSocket CommunicationokHttp supports WebSocket communication, which enables real-time bidirectional communication between the client and server. It provides an easy-to-use API for establishing WebSocket connections, sending and receiving messages, and handling connection events. This makes it suitable for building chat applications, real-time collaboration tools, and other applications that require instant data exchange between the client and server.
    Case 5: Proxy ConfigurationokHttp allows developers to configure proxy settings for HTTP requests, making it useful when working with networks that require proxy authentication or bypassing firewalls. It supports various proxy types, including HTTP, SOCKS, and HTTPS proxies, enabling seamless integration with different network environments. By leveraging okHttp’s proxy capabilities, developers can ensure their applications can operate in diverse network configurations.
    Case 6: CachingokHttp provides built-in support for response caching, allowing developers to cache network responses on the client side. This helps reduce network traffic, improve app performance, and provide offline capabilities. By leveraging okHttp’s caching features, developers can implement efficient data synchronization strategies, store temporary data, and enhance the overall user experience of their applications.
    Case 7: Testing and MockingokHttp offers convenient testing and mocking capabilities, making it easier to write unit tests for network-related code. It provides a testing-specific API that allows developers to intercept and mock network requests, control responses, and simulate various network scenarios. This enables comprehensive testing of network-dependent features and ensures the reliability and stability of the application under different network conditions.

    Cases when okHttp does not work

    1. SSL/TLS Connection Issues: okHttp may not work when there are SSL/TLS connection problems. This can occur if the server has an invalid or expired SSL certificate, if the certificate chain is incomplete, or if the trust chain cannot be established. In such cases, okHttp may fail to establish a secure connection and the requests may not be successful. It is important to ensure that the server’s SSL certificate is valid and properly configured.
    2. Proxy Configuration: If there is a proxy server involved in the network setup, okHttp may not work if the proxy configuration is incorrect or if the proxy server is not accessible. The proxy settings need to be correctly configured in order for okHttp to route the requests through the proxy server. Incorrect proxy configuration can lead to connection timeouts or errors.
    3. Network Connectivity Issues: okHttp relies on the underlying network connectivity to establish connections and send/receive data. If there are network connectivity issues such as a weak or unstable network signal, okHttp may not work as expected. This can result in slow response times, connection timeouts, or failed requests. It is important to have a stable network connection for okHttp to function properly.
    4. Server-Side Restrictions: In some cases, the server may have restrictions or security measures in place that prevent okHttp from accessing certain resources or endpoints. This can be due to IP whitelisting, rate limiting, or other access control mechanisms implemented on the server. If okHttp is unable to access the required resources due to server-side restrictions, the requests may not be successful.
    5. Client-Side Configuration Errors: okHttp requires proper configuration on the client-side in order to function correctly. If there are errors or misconfigurations in the client code, such as incorrect URL formation, missing headers, or invalid request parameters, okHttp may not work as intended. It is important to ensure that the client-side code is properly implemented and configured.

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