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Artem Dz., Full-stack Ruby on Rails Engineer

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Cherkasy, Ukraine
Last Updated: 24 Nov 2023

- Full-stack Ruby on rails engineer with 12+ years of experience. - Proven expertise as a Ruby on Rails developer, with a focus on building and enhancing web applications, implementing new features, and optimizing database performance. - Worked with various frontend technologies such as React, Angular, jQuery, Datatables, ElementalJS, and VueJS - Developed mobile applications using technologies like React Native and Ionic, contributing to the expansion of platforms and providing a seamless user experience. - Demonstrated leadership skills as a Team Lead and Senior Full-Stack Engineer, leading projects from inception to completion, managing teams, and ensuring the successful implementation of functionalities.

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Kostiantyn, Rust Developer

Last Updated: 19 Sep 2023

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Table of Contents

How and where is Capybara used?

Case NameCase Description
E-commerce TestingCapybara is widely used for testing e-commerce websites. It allows developers to simulate user interactions such as adding items to cart, filling out forms, and making purchases. By automating these actions, Capybara ensures that the website functions correctly and provides a smooth user experience.
Form ValidationCapybara can be used to test form validation on web applications. It can fill out forms with various inputs, including valid and invalid data, and verify that the validation rules are correctly enforced. This helps to identify and fix any issues related to form submission and data validation.
Single Page ApplicationsWith the rise of single page applications (SPAs), Capybara has become an essential tool for testing the functionality and user experience of these web applications. It can handle asynchronous actions, such as loading content dynamically, and ensure that the SPA behaves as expected across different browsers.
Authentication and AuthorizationCapybara can simulate user login and test authentication and authorization mechanisms of web applications. It can verify that only authorized users have access to certain pages or features, helping to identify any security vulnerabilities or misconfigurations.
Integration TestingCapybara is often used for integration testing, where multiple components of a web application are tested together to ensure they work seamlessly. It can simulate interactions between different parts of the application and verify that the integration points are functioning correctly.
Mobile App TestingCapybara can also be utilized for testing mobile applications. By integrating Capybara with frameworks like Appium or Calabash, developers can write tests that interact with mobile app interfaces and validate their behavior across different devices and operating systems.
Accessibility TestingCapybara can help in testing the accessibility of web applications. It can be used to validate that the application meets WCAG (Web Content Accessibility Guidelines) standards, ensuring that it is usable by people with disabilities and compliant with accessibility regulations.
Data ScrapingCapybara’s powerful scraping capabilities make it a valuable tool for extracting data from websites. It can navigate through web pages, interact with elements, and extract desired information. This can be useful for tasks like data mining, market research, or building web crawlers.
Performance TestingCapybara can be used to measure the performance of web applications by simulating user interactions at scale. By running tests with multiple concurrent users, it can help identify performance bottlenecks, slow-loading pages, or other issues affecting the application’s responsiveness.
User Acceptance TestingCapybara simplifies user acceptance testing by allowing non-technical stakeholders to interact with the application in a controlled manner. Testers can use Capybara to perform predefined actions and verify that the application meets the desired requirements and user expectations.

TOP 10 Capybara Related Technologies

  • Programming Languages: Ruby

    Ruby is a dynamic, object-oriented language known for its simplicity and readability. It is the primary language used for Capybara software development. With its elegant syntax and powerful features, Ruby allows developers to write clean and concise code, making it a popular choice for web development.

  • Framework: Ruby on Rails

    Ruby on Rails, often referred to as Rails, is a robust and efficient web application framework built on top of Ruby. It follows the Model-View-Controller (MVC) architectural pattern, providing developers with a structured approach to building web applications. Rails comes with a rich set of conventions and libraries, enabling rapid development and easy maintenance.

  • Testing Framework: RSpec

    RSpec is a behavior-driven development (BDD) framework for Ruby that is commonly used for testing Capybara applications. It provides a readable and expressive syntax, allowing developers to write specifications and expectations in a natural language style. RSpec promotes good testing practices and helps ensure the quality and reliability of the software.

  • Automation Tool: Selenium

    Selenium is a widely-used open-source automation tool for web browsers. It allows developers to write automated tests that interact with web applications, including Capybara-based projects. Selenium supports multiple programming languages and provides a range of features for browser automation, making it an essential tool for testing and development.

  • Version Control: Git

    Git is a distributed version control system widely used in the software development industry. It enables teams to collaborate on projects efficiently, track changes, and manage code repositories. Git provides features like branching, merging, and version history, making it an indispensable tool for Capybara software development.

  • Package Manager: Bundler

    Bundler is a dependency management tool specifically designed for Ruby projects. It allows developers to specify and manage the libraries and dependencies required by their applications. Bundler ensures consistency across development environments and simplifies the process of installing and updating packages, enhancing the productivity of Capybara software development.

  • Continuous Integration: Jenkins

    Jenkins is a popular open-source automation server that supports continuous integration and delivery. It provides a platform for building, testing, and deploying software projects, including Capybara applications. Jenkins integrates with various tools and frameworks, allowing developers to automate workflows and ensure the stability and quality of their software.

Soft skills of a Capybara Developer

Soft skills are crucial for Capybara Developers as they contribute to effective collaboration, communication, and teamwork. These skills enhance their ability to work well with clients, colleagues, and stakeholders, leading to successful project outcomes. Here are the soft skills required for Capybara Developers at different levels:


  • Adaptability: Ability to quickly grasp new concepts and technologies in a dynamic development environment.
  • Attention to Detail: Careful and precise approach to writing code and conducting thorough testing to ensure the quality of the software.
  • Time Management: Efficiently prioritize tasks and meet deadlines while maintaining code quality.
  • Problem Solving: Analytical thinking and troubleshooting skills to identify and resolve issues in the software development process.
  • Teamwork: Collaborative mindset and willingness to work with others to achieve common goals.


  • Leadership: Ability to take ownership of tasks, guide less experienced developers, and contribute to project planning and decision-making.
  • Communication: Effective verbal and written communication skills to convey complex technical concepts to both technical and non-technical stakeholders.
  • Mentoring: Willingness to share knowledge and provide guidance to junior developers, fostering their professional growth.
  • Conflict Resolution: Skill in resolving conflicts and managing disagreements within the team to maintain a positive work environment.
  • Creativity: Thinking outside the box to develop innovative solutions and improve existing systems.
  • Client Management: Building and maintaining strong relationships with clients, understanding their needs, and delivering solutions that meet their requirements.
  • Continuous Learning: Actively seeking opportunities to expand knowledge and stay updated with the latest industry trends and technologies.


  • Strategic Thinking: Ability to align technical decisions with business goals and contribute to the overall project strategy.
  • Project Management: Experience in leading and managing projects, including resource allocation, risk assessment, and ensuring timely delivery.
  • Negotiation Skills: Effective negotiation with clients, stakeholders, and team members to find mutually beneficial solutions.
  • Empathy: Understanding and considering the perspectives and needs of team members, clients, and end-users.
  • Decision-making: Making informed decisions based on data analysis, experience, and consideration of potential impacts.
  • Influence: Ability to inspire and motivate the team, driving them towards achieving project objectives.
  • Resilience: Maintaining composure under pressure and adapting to changing circumstances to overcome challenges.
  • Business Acumen: Understanding the business domain and applying this knowledge to develop software solutions that address specific industry needs.

Expert/Team Lead

  • Strategic Leadership: Guiding and inspiring teams to achieve long-term goals and aligning technical decisions with the organization’s vision.
  • Cross-Functional Collaboration: Collaborating with other teams and departments to ensure smooth integration and efficient delivery of software solutions.
  • Change Management: Leading teams through organizational changes and driving adoption of new processes and technologies.
  • Innovation: Encouraging a culture of innovation and continuous improvement within the team and organization.
  • Business Development: Identifying new business opportunities, fostering client relationships, and contributing to business growth.
  • Technical Excellence: Demonstrating deep technical expertise and staying at the forefront of new technologies and best practices.
  • Strategic Decision-making: Making high-level decisions that impact the overall direction and success of the organization.
  • Conflict Management: Effectively resolving conflicts and mitigating potential risks to maintain a harmonious and productive work environment.
  • Team Building: Building and nurturing high-performing teams through recruitment, training, and mentorship.
  • Quality Assurance: Ensuring the quality of deliverables through rigorous testing, code reviews, and adherence to industry standards.
  • Client Relationship Management: Building and maintaining strong relationships with clients, understanding their business needs, and providing exceptional service.

Pros & cons of Capybara

6 Pros of Capybara

  • Capybara is a powerful and flexible web automation tool.
  • It provides a simple and intuitive API for interacting with web pages.
  • Capybara supports multiple browsers and allows you to run tests in parallel.
  • It integrates well with popular testing frameworks like RSpec and Cucumber.
  • Capybara has excellent support for handling asynchronous JavaScript operations.
  • It allows you to write expressive and readable tests, making it easier to maintain your test suite.

6 Cons of Capybara

  • Setting up Capybara can be complex, especially if you are new to web automation.
  • It may require additional configuration and setup to work with specific browsers or headless environments.
  • Capybara can be slower compared to other web automation tools due to its focus on robustness and reliability.
  • Debugging issues with Capybara tests can be challenging, as the error messages are not always clear.
  • Capybara may have compatibility issues with certain web frameworks or JavaScript libraries.
  • It requires a good understanding of HTML and CSS selectors to effectively locate elements on the page.

TOP 14 Facts about Capybara

  • The Capybara is the largest living rodent in the world, with an average weight of 77 to 146 pounds (35 to 66 kilograms) and a length of about 3.3 to 4.4 feet (1 to 1.3 meters).
  • These impressive creatures are native to South America, specifically found in countries such as Brazil, Colombia, Venezuela, and Argentina.
  • Capybaras are semi-aquatic mammals, perfectly adapted for both land and water habitats. They have webbed feet for swimming and can stay submerged for up to five minutes.
  • With their barrel-shaped bodies, short legs, and a head that resembles that of a guinea pig, capybaras have a unique appearance.
  • These social animals are highly gregarious and live in large groups known as “herds” or “capybara colonies”. These colonies can consist of up to 100 individuals.
  • Capybaras are herbivores, primarily feeding on grasses, aquatic plants, and fruits. They have specialized molars and a digestive system that allows them to efficiently process plant material.
  • Due to their friendly and docile nature, capybaras are often referred to as the “world’s largest rodents with a gentle disposition”. They are known to be sociable and often interact positively with other animals.
  • Their thick, coarse fur helps them regulate their body temperature and provides protection against parasites and predators.
  • Capybaras have a lifespan of around 8 to 10 years in the wild, but can live up to 12 years in captivity.
  • These remarkable mammals have scent glands on their noses that they use for marking territory and communicating with other capybaras.
  • Despite their large size, capybaras are excellent swimmers and can move through water with surprising agility.
  • Their unique ability to digest cellulose allows them to efficiently extract nutrients from tough plant material.
  • Capybaras have a significant ecological role as they provide a food source for predators such as jaguars, anacondas, and caimans.
  • These captivating creatures have even made appearances in popular culture, with capybara characters featuring in children’s books, video games, and even as internet memes.

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 and debugging tasks, learning and applying new technologies, working on smaller projects under supervision.$50,000 – $70,000
Middle2-5 yearsDeveloping and maintaining software applications, working on medium-sized projects, collaborating with team members, participating in code reviews and documentation.$70,000 – $90,000
Senior5+ yearsLeading and guiding junior and middle developers, designing and implementing complex software solutions, participating in architectural discussions, mentoring team members.$90,000 – $120,000
Expert/Team Lead8+ yearsLeading a team of developers, driving technical decisions, coordinating project timelines and deliverables, providing technical expertise, conducting performance reviews.$120,000 – $150,000

Cases when Capybara does not work

  1. Dynamic content: Capybara may encounter difficulties when dealing with dynamic content on a web page. Since Capybara relies on waiting for certain elements to appear before interacting with them, it may fail if the content is loaded asynchronously or if there are delays in the rendering process. This can lead to inconsistent test results or timeouts.
  2. JavaScript-heavy applications: Capybara interacts with web pages using a headless browser, such as Selenium or Poltergeist. However, if your application heavily relies on JavaScript and dynamic behavior, Capybara might not be the optimal choice. In such cases, using a tool specifically designed for JavaScript testing, like Cypress or TestCafe, might yield better results.
  3. Complex CSS selectors: While Capybara provides powerful selector methods, complex CSS selector chains can sometimes be challenging to use. If your application relies heavily on complex CSS selectors, it may become difficult to accurately select elements using Capybara’s built-in methods.
  4. Performance testing: Capybara is primarily designed for feature testing and acceptance testing, focusing on user interactions. If you require high-performance load testing or stress testing, you may need to consider alternative tools specifically tailored for performance testing, such as Apache JMeter or Gatling.
  5. Mobile application testing: Capybara is primarily focused on web application testing and may not be the best choice for testing mobile applications. If you need to perform mobile testing, it is recommended to use specialized frameworks like Appium or Calabash.

What are top Capybara instruments and tools?

  • Capybara: Capybara is a Ruby-based web automation framework that is widely used for testing web applications. It provides a simple and expressive DSL (Domain-Specific Language) for interacting with web browsers. Capybara allows developers to write high-level feature tests that simulate user behavior and interactions with the application.
  • Selenium: Selenium is a popular open-source web testing framework that supports multiple programming languages, including Ruby. It provides a powerful set of tools and APIs for automating browser actions, such as clicking buttons, filling forms, and navigating through web pages. Capybara integrates seamlessly with Selenium, allowing developers to leverage the features of both frameworks.
  • Poltergeist: Poltergeist is a headless driver for Capybara that utilizes PhantomJS, a headless browser, to perform automated tests. It allows developers to test their web applications without the need for a visible browser window, making it useful for running tests in a CI/CD (Continuous Integration/Continuous Deployment) environment. Poltergeist also provides additional features like network traffic inspection and manipulation.
  • WebMock: WebMock is a library for stubbing and mocking HTTP requests made by Capybara during test execution. It allows developers to simulate different HTTP responses and test various scenarios without actually making real network requests. This can greatly speed up the test execution time and make the tests more reliable by eliminating external dependencies.
  • DatabaseCleaner: DatabaseCleaner is a tool that helps manage the state of the database during test runs. It provides strategies for cleaning, truncating, or transactionally rolling back database changes made during tests. This ensures that each test starts with a clean and predictable database state, improving test reliability and reducing the possibility of test interference.
  • Shoulda Matchers: Shoulda Matchers is a library that provides convenient matchers and macros for testing common Rails functionalities and conventions. It integrates well with Capybara and allows developers to write concise and expressive test assertions. Shoulda Matchers covers a wide range of scenarios, including model validations, associations, and controller actions.
  • RSpec: RSpec is a popular behavior-driven development (BDD) framework for Ruby that provides a domain-specific language for writing expressive and readable tests. It integrates seamlessly with Capybara and allows developers to structure their tests in a clear and modular way. RSpec provides powerful matchers and hooks for setting up test contexts and performing assertions.
  • Cucumber: Cucumber is a tool that supports behavior-driven development by allowing developers to write tests in a human-readable format. It uses the Gherkin language, which describes test scenarios using Given-When-Then syntax. Capybara can be easily integrated with Cucumber, enabling developers to write feature tests that are easily understood by stakeholders and non-technical team members.

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