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Vladimir Sh., Lead QA Engineer

Last Updated: 31 Aug 2023

- 10+ years in QA with experience in leading various QA teams and projects and strong experience in staffing and resource management. - Experience in creating test automation frameworks for Web UI/API/Mobile - Great knowledge of CI environment configuration - Working knowledge of different OS (Windows, Linux) - Proven ability to learn fast new technologies and approaches to use them as soon as possible - Skilled in developing test documentation such as test plans, test cases, incident reports and using defect tracking systems - Good understanding of systems development life cycle methodology - Strong knowledge about software development life cycle, QA methodology and tools

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Vladimir Sh., Lead QA Engineer

Last Updated: 6 Sep 2023

Highly experienced software engineer with over 10 years in QA, leading various QA teams and projects. - Expertise in testing automation tools Appium, Selenium, Cypress, WebDriver, and Protractor; - Experience with Java, Groovy, JavaScript, and TypeScript; - Skilled in creating test automation frameworks for Web UI/API/Mobile platforms; - Proficient in developing test documentation such as test plans, test cases, and incident reports; - Good understanding of systems development life cycle methodology and QA methodology and tools; - Strong knowledge of CI environment configuration and different operating systems (Windows, Linux); - Ability to quickly learn new technologies and approaches and implement them effectively.

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Kate E., JavaScript Software Engineer (React/React Native)

Last Updated: 4 Jul 2023
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- 4 years of experience in software development based on frontend technologies. - Front-end developer with expertise in web & mobile application development based React.js/Vue.js, React Native, HTML/CSS. - Experienced in the next stages of the life cycle of development of business applications: planning, estimation, investigation, development, writing tests, support of existing code.

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Bogdan S, Full-Stack Developer

Last Updated: 4 Jul 2023

• 5+ years of practical experience (PHP Symfony, JavaScript React) • Good communication skills, proactive person, excellent team player, time management, ability to analyze complex technical information, excellent problem solver, understanding clients’ business processes. • Upper-Intermediate English level.

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Artem P., Full-stack Engineer

Eindhoven, Netherlands
Last Updated: 4 Jul 2023

- 9+ years of work experience in software development - Solid knowledge of Microsoft .Net Framework, C#, JavaScript - Understanding of OOD/OOP/SOA concepts and design patterns -Skills in designing applications architecture and technical research - Experience both in front-end and back-end development

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Table of Contents

What are top Mercurial instruments and tools?

  • Mercurial: Mercurial is a distributed version control system (DVCS) that was first released in 2005. It was developed by Matt Mackall and has since gained popularity among software development teams for its simplicity and efficiency. Mercurial is known for its strong performance, scalability, and ease of use, making it a preferred choice for both small and large projects.
  • TortoiseHg: TortoiseHg is a graphical user interface (GUI) tool for Mercurial. It provides an easy-to-use interface for managing repositories, viewing history, and performing various version control operations. TortoiseHg integrates seamlessly with Windows Explorer, allowing users to access Mercurial functionality directly from the file explorer.
  • HGWeb: HGWeb is a web-based interface for Mercurial repositories. It allows users to browse, search, and visualize repository history through a web browser. HGWeb provides a user-friendly and intuitive interface for accessing Mercurial repositories remotely, making it convenient for distributed teams and remote collaboration.
  • HG Flow: HG Flow is a set of extensions for Mercurial that implement the popular Git Flow branching model. It provides a structured workflow for managing feature branches, releases, and hotfixes, making it easier to collaborate and manage complex development processes. HG Flow simplifies the process of branching, merging, and releasing code in Mercurial.
  • HG Git: HG Git is a Mercurial extension that allows users to interact with Git repositories using Mercurial commands. It provides seamless integration between Mercurial and Git, enabling users to work with both systems interchangeably. HG Git enables developers to collaborate with teams using different version control systems without the need for additional tools or conversions.
  • HG Subversion: HG Subversion is an extension for Mercurial that enables interaction with Subversion repositories. It allows users to clone, pull, push, and synchronize Subversion repositories using Mercurial commands. HG Subversion provides a bridge between Mercurial and Subversion, allowing teams to integrate Subversion repositories into their Mercurial workflows.
  • HG Evolution: HG Evolution is a Mercurial extension that adds support for evolutionary algorithms to manage and optimize source code. It allows developers to automatically generate and evolve code variants based on predefined fitness criteria. HG Evolution can be used to explore different code configurations and find optimal solutions for specific development tasks.
  • HG Bookmarks: HG Bookmarks is a Mercurial extension that provides lightweight, named pointers to specific commits or branches. It allows users to create and manage bookmarks as an alternative to traditional branching and merging. HG Bookmarks simplifies the process of navigating and working with multiple branches in Mercurial repositories.
  • HG Watchman: HG Watchman is a Mercurial extension that monitors repository changes and triggers custom actions based on predefined rules. It allows users to automate tasks such as running tests, generating documentation, or deploying code whenever specific changes occur in the repository. HG Watchman enhances productivity by eliminating the need for manual intervention in repetitive development tasks.

TOP 10 Mercurial Related Technologies

  • Python

    Python is the most popular language for Mercurial software development. It is a dynamic and versatile language known for its simplicity and readability. Python offers a wide range of libraries and frameworks that make development with Mercurial efficient and straightforward. Its extensive community support and well-documented resources make it an ideal choice for Mercurial development.

  • Django

    Django is a high-level Python web framework that is widely used for Mercurial software development. It provides a clean and pragmatic design, enabling developers to build robust and scalable web applications. With built-in features like ORM, authentication, and caching, Django simplifies the development process and promotes code reuse. Its popularity in the Mercurial community makes it a valuable tool for building web applications.

  • Git

    While Mercurial is the version control system of choice, Git is worth mentioning due to its widespread adoption and compatibility with Mercurial. Git is a distributed version control system known for its speed and flexibility. Developers familiar with Git can easily work with Mercurial repositories using tools like hg-git, which allows seamless integration between the two systems.

  • PyCharm

    PyCharm is a powerful integrated development environment (IDE) specifically designed for Python development. It provides advanced features such as code completion, debugging, and version control integration, making it an excellent choice for Mercurial software development. PyCharm’s intuitive interface and extensive plugin ecosystem enhance productivity and streamline the development process.

  • Bitbucket

    Bitbucket is a web-based platform that offers hosting for Mercurial repositories. It provides features like code collaboration, issue tracking, and continuous integration, making it an essential tool for Mercurial software development. Bitbucket’s integration with other popular development tools and its user-friendly interface make it a preferred choice for managing Mercurial projects.

  • Jenkins

    Jenkins is a widely used open-source automation server that can be integrated into the Mercurial development workflow. It enables continuous integration and delivery, automating the build, test, and deployment processes. By integrating Jenkins with Mercurial, developers can ensure the quality and stability of their codebase, leading to faster and more reliable software development.

  • Linux

    Linux is the operating system of choice for many Mercurial developers. Its stability, security, and open-source nature make it an ideal environment for software development. The command-line interface and extensive toolset available in Linux provide developers with the flexibility and control they need to work efficiently with Mercurial repositories.

Pros & cons of Mercurial

6 Pros of Mercurial

  • 1. Distributed Version Control: Mercurial is a distributed version control system (DVCS), which means that each developer has a complete copy of the repository. This allows for offline work and easy collaboration between team members.
  • 2. Easy to Learn and Use: Mercurial has a simple and intuitive command-line interface, making it easy for developers to learn and use. It also provides graphical user interface (GUI) tools for those who prefer a visual approach.
  • 3. Fast and Efficient: Mercurial is known for its speed and performance. It has efficient algorithms for handling large repositories and complex branching and merging operations.
  • 4. Scalable: Mercurial can handle projects of any size, from small personal projects to large enterprise-level software development. It can efficiently manage thousands of files and millions of lines of code.
  • 5. Cross-Platform Compatibility: Mercurial is available on multiple platforms, including Windows, macOS, and Linux. This allows developers to work seamlessly across different operating systems.
  • 6. Strong Community Support: Mercurial has a vibrant and active community of users and developers. There are numerous online resources, forums, and documentation available to help developers troubleshoot issues and find answers to their questions.

6 Cons of Mercurial

  • 1. Steeper Learning Curve for Centralized VCS Users: Developers who are accustomed to centralized version control systems (VCS) like Subversion may find it initially challenging to adapt to the distributed nature of Mercurial.
  • 2. Limited Third-Party Integrations: While Mercurial integrates well with popular development tools like IDEs and issue trackers, it may have fewer third-party integrations compared to other version control systems like Git.
  • 3. Slower Performance with Large Binary Files: Mercurial may experience slower performance when dealing with large binary files, as it stores them as full copies in the repository. This can lead to increased repository size and slower operations.
  • 4. Less Popular in Open Source Community: Mercurial is less popular in the open source community compared to Git. This can result in fewer publicly available repositories and community support for certain projects.
  • 5. Limited Hosting Options: While there are several hosting providers that support Mercurial repositories, the options may be more limited compared to Git. This can make it slightly harder to find a suitable hosting solution for your project.
  • 6. Limited Windows Integration: While Mercurial works well on Windows, it may have slightly less seamless integration with the operating system compared to Git, which was originally developed for Linux.

Cases when Mercurial does not work

  1. Case 1: Large Repositories
    Mercurial may encounter performance issues when dealing with large repositories. As the repository size increases, certain operations such as cloning, pushing, or pulling can become noticeably slower. This is due to the nature of Mercurial’s design, where the entire history of the repository is stored locally. If you are working with extremely large repositories, you might experience delays and reduced efficiency.
  2. Case 2: Poor Network Connectivity
    Mercurial heavily relies on network connectivity for remote operations like pushing and pulling changesets. If you have a poor internet connection or intermittent network issues, it can lead to problems while interacting with remote repositories. Slow network speeds or frequent disconnections can result in failed or incomplete operations, making it difficult to collaborate effectively with team members.
  3. Case 3: Compatibility Issues
    While Mercurial is a powerful version control system, it may encounter compatibility issues when collaborating with users who prefer different version control systems. For example, if you need to work on a project with developers who primarily use Git, you might face challenges when trying to synchronize code changes between Mercurial and Git repositories. Although there are tools available to bridge the gap between different systems, such as hg-git, these solutions may not always provide seamless integration.
  4. Case 4: Lack of Familiarity
    Mercurial has its own set of commands and workflows, which might differ from other version control systems you might be accustomed to, such as Git or Subversion. If you are not familiar with Mercurial’s terminology and concepts, it can be challenging to adapt and work efficiently within its framework. This lack of familiarity can lead to confusion and potential mistakes when performing operations, especially for new users or those transitioning from other version control systems.
  5. Case 5: Limited Ecosystem and Third-Party Tools
    Compared to some other version control systems, Mercurial has a smaller user base and a more limited ecosystem of third-party tools and integrations. While it provides essential features out-of-the-box, you might find that certain specialized tools or integrations that are readily available for other systems are not as prevalent in the Mercurial community. This can be a drawback if you rely heavily on specific integrations or workflows that are not well-supported within the Mercurial ecosystem.

Hard skills of a Mercurial Developer

As a Mercurial Developer, you need to possess a range of hard skills to excel in your role. Here are the essential hard skills required for different levels of experience:


  • Version Control: Proficient in using Mercurial for managing code repositories and branching workflows.
  • Git: Familiarity with Git as a distributed version control system.
  • Command Line: Comfortable working with the command line interface to execute Mercurial commands and navigate repositories.
  • Code Review: Ability to perform code reviews and provide constructive feedback to team members.
  • Problem Solving: Strong problem-solving skills to troubleshoot and resolve version control issues.


  • Merge Strategies: Deep understanding of different merge strategies in Mercurial and their implications.
  • Continuous Integration: Experience integrating Mercurial with CI/CD pipelines for automated testing and deployment.
  • Issue Tracking: Proficiency in using issue tracking tools to link code changes with relevant bug reports or feature requests.
  • Scripting: Ability to write scripts in languages like Python to automate repetitive tasks in Mercurial.
  • Collaboration: Effective collaboration skills to work seamlessly with development teams and stakeholders.
  • Performance Optimization: Knowledge of optimizing Mercurial repositories for improved performance and scalability.
  • Release Management: Experience in managing releases and versioning of software using Mercurial.


  • Repository Configuration: Expertise in configuring advanced settings and hooks in Mercurial repositories.
  • Branching Strategies: Proficient in designing and implementing branching strategies that align with project requirements.
  • Mentoring: Ability to mentor and guide junior developers in Mercurial best practices and workflows.
  • Conflict Resolution: Experience in resolving complex merge conflicts and maintaining code integrity.
  • Code Analysis: Proficiency in using code analysis tools to identify code smells and improve code quality.
  • Security: Knowledge of securing Mercurial repositories and implementing access control mechanisms.
  • Training: Experience in conducting training sessions or workshops to educate teams on Mercurial usage and best practices.

Expert/Team Lead

  • Custom Extensions: Proficiency in developing custom extensions or plugins to extend Mercurial’s functionality.
  • Performance Tuning: Expertise in fine-tuning Mercurial’s performance through optimizations and infrastructure enhancements.
  • Codebase Management: Experience in managing large and complex codebases using Mercurial.
  • Architecture Design: Ability to design scalable and efficient version control architectures for enterprise-level projects.
  • Strategic Planning: Proficiency in strategic planning and roadmap development for version control systems.
  • Leadership: Strong leadership skills to lead a team of developers and drive successful Mercurial adoption.
  • Community Engagement: Active participation in the Mercurial community and contribution to its development.
  • Continuous Improvement: Commitment to continuous improvement by staying updated with the latest trends and advancements in Mercurial and version control.
  • Conflict Resolution: Exceptional conflict resolution skills to handle complex interpersonal or technical conflicts within the team.
  • Technical Documentation: Proficiency in creating comprehensive technical documentation for Mercurial processes and workflows.
  • Release Engineering: Expertise in managing release engineering processes and ensuring smooth software releases using Mercurial.

Soft skills of a Mercurial Developer

Soft skills are essential for a Mercurial Developer to excel in their role and collaborate effectively with their team members. These skills enhance communication, problem-solving, and teamwork abilities, leading to improved productivity and project success.


  • Adaptability: Ability to quickly learn and adapt to new tools, technologies, and processes.
  • Attention to Detail: Paying close attention to small details ensures high-quality code and prevents errors.
  • Time Management: Efficiently managing time to meet deadlines and prioritize tasks.
  • Collaboration: Working well with team members, seeking help when needed, and contributing to a positive team environment.
  • Communication: Effectively conveying ideas, asking questions, and providing updates to team members.


  • Leadership: Taking initiative, guiding junior team members, and contributing to project planning and decision-making.
  • Problem-solving: Analyzing complex issues, finding innovative solutions, and troubleshooting code-related problems.
  • Conflict Resolution: Resolving conflicts or disagreements within the team in a professional and constructive manner.
  • Critical Thinking: Evaluating different approaches, making informed decisions, and anticipating potential challenges.
  • Adaptability: Adapting quickly to changing project requirements or priorities.
  • Time Management: Efficiently managing time and resources to optimize productivity.
  • Attention to Detail: Ensuring accuracy and precision in code development and project deliverables.


  • Mentorship: Mentoring and guiding junior and middle-level developers, sharing knowledge, and providing constructive feedback.
  • Effective Communication: Clearly articulating complex concepts, discussing ideas with stakeholders, and influencing decision-making.
  • Team Building: Fostering a collaborative and inclusive team environment, promoting teamwork and cohesion.
  • Strategic Thinking: Aligning development efforts with business goals, identifying opportunities for improvement, and proposing innovative solutions.
  • Project Management: Overseeing project timelines, resources, and deliverables, ensuring successful project completion.
  • Conflict Resolution: Resolving conflicts or disagreements within the team, facilitating effective communication and finding win-win solutions.
  • Decision-making: Making informed decisions based on an understanding of business requirements and technical considerations.
  • Adaptability: Adapting quickly to changing project scopes, technologies, and client expectations.

Expert/Team Lead

  • Strategic Planning: Developing long-term plans, setting project goals, and aligning them with business objectives.
  • Technical Leadership: Providing technical direction, guiding architectural decisions, and ensuring code quality and best practices.
  • Innovation: Driving innovation within the team, exploring new technologies, and proposing improvements to existing processes.
  • Team Management: Managing and mentoring a team of developers, fostering professional growth and career development.
  • Client Management: Building strong relationships with clients, understanding their needs, and delivering value-added solutions.
  • Risk Management: Identifying and mitigating risks, anticipating challenges, and developing contingency plans.
  • Continuous Learning: Keeping up-to-date with industry trends, attending conferences, and encouraging a culture of learning within the team.
  • Empathy: Understanding and empathizing with team members, fostering a supportive and inclusive work environment.
  • Effective Communication: Communicating complex technical concepts to non-technical stakeholders, influencing project decisions, and building consensus.
  • Conflict Resolution: Resolving conflicts or disagreements within the team, promoting open dialogue and collaboration.
  • Strategic Thinking: Identifying opportunities for process improvement, optimizing workflows, and maximizing team efficiency.

How and where is Mercurial used?

Case NameCase Description
Collaborative Software DevelopmentMercurial is widely used for collaborative software development due to its distributed nature. It allows multiple developers to work on a project simultaneously, making it easier to manage and merge changes. This enables teams to work more efficiently and improves productivity.
Version Control for Large ProjectsMercurial is particularly suited for version control of large projects. It efficiently handles large codebases and scales well with increased file sizes and numbers. Its ability to perform operations locally without the need for a central server makes it an ideal choice for managing complex software projects.
Branching and MergingMercurial excels at branching and merging, allowing developers to create and manage multiple branches of code. This enables parallel development, experimentation, and the ability to work on different features or bug fixes simultaneously. With Mercurial, merging changes from different branches is made easier, ensuring smooth integration of code.
Offline DevelopmentMercurial’s distributed nature makes it suitable for offline development scenarios. Developers can continue working on their projects even without an internet connection. Mercurial stores the entire repository locally, allowing developers to commit changes and synchronize with the central repository once they regain internet connectivity.
Easy RollbacksMercurial provides a straightforward way to roll back to a previous state of a project. If a bug is discovered or an undesired change is made, developers can easily revert to a previous commit using Mercurial’s built-in features. This helps in maintaining project integrity and reduces the risk of introducing errors.
Continuous IntegrationMercurial integrates smoothly with various continuous integration (CI) tools and platforms. It allows developers to automate the build, test, and deployment processes, ensuring that changes are automatically validated and integrated into the project. This helps in maintaining code quality and streamlining the development workflow.
Code Review and CollaborationMercurial offers features for code review and collaboration, making it easier for teams to review and discuss code changes. Developers can create and share code reviews, provide feedback, and make suggestions directly within the Mercurial environment. This facilitates effective communication and improves the overall code quality.
Support for Large File StorageMercurial provides extensions and plugins that enable efficient handling of large files, such as media assets or binary files. This is beneficial for projects that require version control of large files, ensuring that changes to these files are properly tracked and managed within the repository.

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

  • Mercurial is a distributed version control system (DVCS) that facilitates collaborative software development. It was created in 2005 by Matt Mackall.
  • Inspired by BitKeeper, Mercurial was designed to be fast and efficient, providing a simpler and more intuitive approach to managing code compared to traditional centralized systems.
  • The name “Mercurial” refers to the quicksilver nature of the software, highlighting its speed and flexibility.
  • One of the groundbreaking features of Mercurial is its use of a directed acyclic graph (DAG) to represent the history of a project. This allows for easy branching and merging, enabling parallel development and seamless collaboration.
  • Mercurial introduced the concept of “changesets,” which are atomic units of work that can be individually managed, making it easier to track and manage code revisions.
  • Unlike some other version control systems, Mercurial does not rely on a central server. Each developer has a complete copy of the repository, allowing for offline work and reducing the risk of a single point of failure.
  • Mercurial provides robust support for large projects and scales well with increasing repository size. It efficiently handles large binary files and can handle repositories with millions of files.
  • With its robust branching and merging capabilities, Mercurial has become a popular choice for open-source projects and large software development teams.
  • Mercurial has a user-friendly command-line interface, but it also offers graphical user interfaces (GUIs) for those who prefer a visual way to interact with the software.
  • Over the years, Mercurial has undergone several major releases, introducing new features and improvements. Notable versions include 0.9 (the first public release), 1.0 (stabilizing the API), 2.0 (introducing subrepositories), and 5.0 (further enhancing performance and scalability).
  • Mercurial has been adopted by several high-profile projects, including Mozilla, Facebook, and Python. Its reliability and scalability have made it a trusted tool for managing large codebases.
  • Mercurial supports integration with popular development tools and platforms such as IDEs, issue trackers, and continuous integration systems, making it adaptable to various software development workflows.
  • While Git has gained significant popularity in recent years, Mercurial continues to be actively developed and maintained. The Mercurial project has a vibrant community of contributors and users.
  • Mercurial has a strong emphasis on data integrity and includes features like cryptographic hashing to ensure the integrity and authenticity of the codebase.
  • Mercurial is cross-platform and runs on major operating systems, including Windows, macOS, and Linux, making it accessible to developers regardless of their preferred platform.

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