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Erkin K., Java Engineer

Ukraine
Last Updated: 4 Jul 2023

- 5+ year of experience in Java software development; - Have experience with Microservices; - Good logical thinking, self-learning, high level of responsibility; - Responsible, hard-working, results-oriented, creative and communicable, team player; - Good attention to detail. - Upper-Intermediate English.

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Java

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Kiryl L., Java/Kotlin Software Engineer

Georgia
Last Updated: 7 Dec 2023

- A software engineer with over 5 years of experience in e-commerce and FinTech domains. - Boasts a strong grasp of Java, Kotlin, JavaScript, and TypeScript, having used them in various projects. - Proficient in back-end development with advanced knowledge of Spring frameworks, Hibernate, REST API design, and integrating systems like Elasticsearch and Kafka. - Has experience in integration payment systems such as Google Pay and Apple Pay. - Skilled in database management systems such as PostgreSQL, MySQL, and MongoDB. - Demonstrates expertise in containerization with Docker and Kubernetes and is adept in CI/CD practices using tools like GitLab CI/CD and Jenkins.

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Java   5 yr.

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Kotlin   2 yr.

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Pavel L., Java Engineer

Poland
Last Updated: 16 Aug 2023

- Software Engineer with over 10 years of practical development experience. - Practical experience with Java Standard Edition 7-17; Java Enterprise Edition(JPA, JTA, CDI, JMS, JSF, JAX-RS, Servlets API); - Hands on experience with Spring technological stack: Spring Core, Spring Boot, Spring Data, Spring Security; - Strong SQL knowledge and the corresponding experience with relational DBMS: Oracle, MSSQL, PostgreSQL; - Code quality assurance: refactoring, review using Crucible and Sonarqube; - Software architect skills: design of application architecture, decision-maker about technological stack; - Experience working in an Agile methodology; - Coordination of all the communications channels between the customer and team; - Development teams building, interviewing, hiring personnel; - Delivery complex software solutions for Application life-cycle management, Media and e-- - Commerce industries, Process automation, plug-in development for Atlassian products. - Intermediate English - Availability starting from ASAP

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Java

Java   10 yr.

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Evgeniy M., Java Engineer

Ukraine
Last Updated: 4 Jul 2023

- 4+ years of IT industry experience - Development of internal functionality, testing and bug fixes - Upper-Intermediate English - Available ASAP

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Java

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Maksim, Blockchain Software Engineer

Poland
Last Updated: 13 Nov 2023

- Software Engineer with 5 years of experience in building web applications and expertise in blockchain, DeFi, NFT, and tokenization domains. - Proficient in programming languages such as Solidity, Node.js, Python, and Java. - Experienced in back-end development using technologies like Spring, Hibernate, and JDBC. - Skilled in working with blockchain technologies including Ethereum, ERC721, ERC1155, and EIP712. - Familiar with CI/CD tools like Jenkins and containerization platforms like Kubernetes and Docker. - Strong knowledge of database management systems like PostgreSQL, MySQL, and MongoDB. - Well-versed in agile methodologies like Scrum and Kanban, with a solution-oriented approach to project objectives.

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TypeScript   2 yr.

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Java   5 yr.

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Node.js   1 yr.

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Solidity   3 yr.

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Ethereum blockchain (ETH)   3 yr.

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Table of Contents

Soft skills of a Liquibase Developer

Soft skills are essential for a Liquibase Developer to effectively collaborate and communicate with their team members and stakeholders. These skills contribute to the overall success of a project and the developer’s professional growth.

Junior

  • Strong Problem-solving Abilities: The ability to analyze and solve problems efficiently, identifying root causes and implementing effective solutions.
  • Adaptability: Being open to new ideas, technologies, and approaches, and quickly adapting to changing project requirements.
  • Effective Communication: Clear and concise communication skills, both verbal and written, to effectively convey ideas and updates to team members.
  • Attention to Detail: Paying close attention to details, ensuring accuracy and precision in code implementation and documentation.
  • Teamwork: Collaborating effectively with team members, actively participating in discussions, and contributing to the team’s goals and objectives.

Middle

  • Leadership Skills: Demonstrating leadership qualities by taking ownership of tasks, guiding and mentoring junior team members, and coordinating project activities.
  • Time Management: Efficiently managing time and priorities, meeting deadlines, and ensuring timely delivery of assigned tasks.
  • Conflict Resolution: The ability to identify and address conflicts or disagreements within the team, facilitating productive discussions and finding mutually beneficial resolutions.
  • Critical Thinking: Applying logical and analytical thinking to evaluate complex problems, make informed decisions, and optimize processes.
  • Customer Focus: Understanding and prioritizing customer needs, delivering solutions that align with their requirements and expectations.
  • Continuous Learning: Proactively seeking opportunities for professional growth, staying updated with the latest industry trends and technologies.
  • Quality Assurance: Ensuring high-quality deliverables through thorough testing, code reviews, and adherence to best practices and coding standards.

Senior

  • Strategic Thinking: Developing a strategic mindset, aligning technical solutions with business goals, and providing valuable insights for project planning and execution.
  • Mentorship: Sharing knowledge and expertise with junior and mid-level developers, guiding their professional development and fostering a learning culture within the team.
  • Stakeholder Management: Effectively engaging and managing relationships with stakeholders, understanding their expectations, and providing regular project updates.
  • Project Management: Demonstrating proficiency in managing complex projects, coordinating resources, and ensuring successful project delivery within budget and timeline.
  • Presentation Skills: Delivering compelling presentations to technical and non-technical stakeholders, effectively communicating complex concepts in a clear and concise manner.
  • Innovation: Driving innovation within the team, exploring new technologies and methodologies to improve processes, efficiency, and overall project outcomes.
  • Decision-making: Making informed and strategic decisions, considering various factors, risks, and potential impact on the project and team.
  • Emotional Intelligence: Understanding and managing emotions effectively, fostering a positive work environment, and promoting healthy team dynamics.

Expert/Team Lead

  • Strategic Planning: Developing long-term plans and strategies, aligning technical roadmaps with organizational objectives, and driving innovation and growth.
  • Cross-functional Collaboration: Collaborating with stakeholders from different departments, leveraging diverse perspectives, and aligning efforts towards shared goals.
  • Change Management: Effectively managing and leading teams through organizational changes, providing guidance, support, and ensuring smooth transitions.
  • Thought Leadership: Demonstrating thought leadership in the field, contributing to industry forums, publications, and conferences, and representing the organization as a subject matter expert.
  • Conflict Resolution: Resolving complex conflicts and disputes, promoting a culture of open communication and respect, and fostering a collaborative and inclusive work environment.
  • Strategic Partnerships: Building and nurturing strategic partnerships with external vendors, clients, and industry leaders to drive business growth and opportunities.
  • Budgeting and Resource Allocation: Managing project budgets, optimizing resource allocation, and ensuring efficient utilization of resources while delivering high-quality solutions.
  • Risk Management: Identifying potential risks, developing mitigation strategies, and proactively managing risks throughout the project lifecycle.
  • Performance Management: Setting clear expectations, providing regular feedback, and managing the performance and career development of team members.
  • Influence and Negotiation: Effectively influencing and negotiating with stakeholders, advocating for the team’s needs and priorities, and driving consensus.
  • Continuous Improvement: Promoting a culture of continuous improvement, implementing feedback loops, and driving process optimization and efficiency gains.

How and where is Liquibase used?

Case NameCase Description
Database Schema ManagementLiquibase is widely used for managing database schema changes across different environments. It allows developers to easily version and track database changes, ensuring consistency and eliminating the need for manual scripts. With Liquibase, developers can easily manage tables, columns, indexes, and other database objects.
Data MigrationLiquibase simplifies the process of migrating data from one database to another. It provides a powerful and flexible mechanism for defining and executing data migration scripts. Developers can easily transform and transfer data between databases, ensuring data integrity during the migration process.
Continuous Integration/Continuous Deployment (CI/CD)Liquibase integrates seamlessly with CI/CD pipelines, enabling automated database deployments. It allows developers to version control database changes and automatically apply them as part of the CI/CD process. With Liquibase, teams can ensure consistent database deployments, reducing deployment errors and improving overall software quality.
Multi-tenant ApplicationsLiquibase is well-suited for managing database schema changes in multi-tenant applications. It allows developers to apply schema changes to specific tenants or groups of tenants, ensuring that each tenant’s data remains isolated and unaffected by changes made for other tenants. This flexibility makes Liquibase a valuable tool for building scalable and customizable multi-tenant applications.
Rollback and RecoveryLiquibase provides built-in support for rolling back database changes, making it easy to revert to a previous state in case of errors or issues. Developers can define rollback scripts alongside their change sets, allowing for precise control over the rollback process. This feature greatly enhances the ability to recover from database-related failures.
Version Control IntegrationLiquibase integrates with popular version control systems, such as Git, SVN, and Mercurial. This integration allows developers to manage database changes alongside their application code, providing a unified version control experience. It also enables collaboration and facilitates team-wide visibility into database changes.
Database TestingLiquibase supports automated database testing by providing the ability to create and manage test data. Developers can define test data change sets and easily apply them to the database before running tests. This ensures a consistent and controlled testing environment, improving the reliability and accuracy of test results.
Database DocumentationLiquibase can generate documentation describing the current state of a database schema. This documentation includes information about tables, columns, constraints, and other database objects. It helps developers and stakeholders understand the structure and dependencies of the database, making it easier to maintain and troubleshoot the application.
Collaborative DevelopmentLiquibase enables multiple developers to work on the same database schema simultaneously. It provides conflict resolution mechanisms, allowing developers to merge their changes and handle conflicts efficiently. This promotes collaboration and streamlines the development process, especially in team environments.
Database RefactoringLiquibase supports refactoring database schemas by providing a mechanism to rename, split, or merge database objects. Developers can safely refactor their database without impacting the application’s functionality. This feature helps maintain a clean and efficient database design, reducing technical debt over time.

Hard skills of a Liquibase Developer

Hard skills of a Liquibase Developer:

Junior

  • SQL: Proficiency in writing and optimizing SQL queries.
  • Liquibase: Basic understanding of Liquibase principles and its command-line interface.
  • Version Control: Familiarity with version control systems like Git.
  • Database Management: Knowledge of basic database management concepts.
  • Scripting: Ability to write simple shell or batch scripts for automation.

Middle

  • Advanced SQL: Expertise in complex SQL queries involving joins, subqueries, and aggregations.
  • Liquibase Configuration: Experience in configuring Liquibase for different environments and databases.
  • Database Design: Proficient in designing and optimizing database schemas.
  • Continuous Integration: Familiarity with integrating Liquibase into CI/CD pipelines.
  • Scripting Languages: Proficiency in scripting languages like Python or Ruby for advanced automation tasks.
  • Performance Tuning: Knowledge of performance tuning techniques for databases.
  • Migration Strategies: Experience in defining and implementing database migration strategies using Liquibase.

Senior

  • Database Administration: Expertise in managing and maintaining databases, including backups, replication, and security.
  • Liquibase Extensions: Experience in developing custom extensions and plugins for Liquibase.
  • Advanced Scripting: Mastery in scripting languages like Groovy or JavaScript for complex automation tasks.
  • Code Review: Proficient in reviewing and providing feedback on Liquibase scripts written by other developers.
  • Data Modeling: Expertise in designing and implementing database models for complex business requirements.
  • Performance Optimization: Proficiency in optimizing database performance through indexing, query optimization, and caching.
  • High Availability: Knowledge of implementing high availability solutions for databases.
  • Database Replication: Experience in setting up and managing database replication for distributed systems.

Expert/Team Lead

  • Database Architecture: Mastery in designing scalable and highly available database architectures.
  • Data Migration: Expertise in handling complex data migration scenarios using Liquibase.
  • Database Security: Proficient in implementing advanced security measures for databases, including encryption and access control.
  • Performance Monitoring: Knowledge of advanced performance monitoring tools and techniques for databases.
  • Team Leadership: Experience in leading a team of Liquibase developers and providing technical guidance.
  • Database Sharding: Proficiency in implementing database sharding techniques for distributed systems.
  • Data Governance: Expertise in establishing data governance policies and ensuring compliance.
  • Disaster Recovery: Knowledge of implementing disaster recovery plans for databases.
  • Cloud Database Services: Familiarity with cloud-based database services like Amazon RDS or Google Cloud SQL.
  • Containerization: Experience in deploying Liquibase scripts in containerized environments using tools like Docker.
  • Database Performance Testing: Proficiency in conducting performance testing and benchmarking for databases.

TOP 10 Facts about Liquibase

  • Liquibase is an open-source database migration tool that helps developers automate and track changes to their database schemas.
  • It supports a wide range of databases including Oracle, MySQL, PostgreSQL, SQL Server, and many more.
  • Liquibase uses a simple XML or YAML-based configuration file to define database changes and allows developers to version control their database schema along with their code.
  • With Liquibase, developers can easily roll back database changes in case of errors or issues, ensuring data integrity and minimizing downtime.
  • It provides a command-line interface (CLI) as well as integrations with popular development tools like Maven, Gradle, and Ant, making it easy to incorporate into existing workflows.
  • Liquibase supports both forward and backward compatibility, allowing developers to add new changes as well as modify or undo existing changes without breaking the application.
  • It offers a range of change types including creating tables, modifying columns, adding indexes, and executing custom SQL scripts, giving developers flexibility in managing their database schema.
  • Liquibase provides a powerful diff feature that can compare two database schemas and generate the necessary change log to bring them in sync, saving developers time and effort.
  • It has a robust plugin ecosystem, allowing developers to extend Liquibase’s functionality and integrate it with other tools and frameworks.
  • Liquibase has a large and active community of users and contributors, providing support, documentation, and frequent updates to ensure its reliability and usability.

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

Seniority NameYears of experienceResponsibilities and activitiesAverage salary (USD/year)
Junior0-2 yearsAssist in developing and maintaining code, debugging software issues, collaborating with team members, and learning new technologies.$50,000 – $70,000
Middle2-5 yearsDevelop and maintain code independently, participate in code reviews, provide technical guidance to junior developers, collaborate with cross-functional teams, and assist in project planning and estimation.$70,000 – $90,000
Senior5-8 yearsLead and participate in complex software development projects, provide technical mentorship and guidance to the team, design and architect software solutions, conduct code reviews, and contribute to process improvement initiatives.$90,000 – $120,000
Expert/Team Lead8+ yearsLead a team of developers, manage project timelines and deliverables, provide technical expertise and strategic direction, collaborate with stakeholders, contribute to the overall technical vision of the organization, and mentor junior and mid-level developers.$120,000 – $150,000+

Pros & cons of Liquibase

8 Pros of Liquibase

  • Liquibase is an open-source database schema management tool that provides a platform-independent solution for managing database changes.
  • It allows for version control of database schemas, making it easier to track and manage changes over time.
  • Liquibase supports a wide range of databases, including Oracle, MySQL, PostgreSQL, SQL Server, and more.
  • With Liquibase, you can define database changes in a human-readable and XML-based format, making it easy to understand and collaborate with other developers.
  • It provides a command-line interface and integration with various build tools, allowing for automated deployment and continuous integration.
  • Liquibase supports rollback functionality, enabling you to revert changes in case of errors or issues.
  • It offers extensibility through custom change types, allowing developers to create their own change sets to suit specific requirements.
  • Liquibase has an active community and regular updates, ensuring ongoing support and improvements.

8 Cons of Liquibase

  • Although Liquibase provides a wide range of database support, some less common databases may have limited or no support.
  • Managing complex database changes and dependencies can be challenging, especially when dealing with large-scale applications.
  • Using Liquibase requires a learning curve, especially for developers who are not familiar with XML-based configuration and database versioning concepts.
  • Configuration errors or conflicts can occur, leading to unexpected behavior or issues with database synchronization.
  • Performing database migrations with Liquibase may require downtime or impact the availability of the application during the migration process.
  • Collaboration between multiple developers working on the same database can be complex, especially when conflicts arise in change sets.
  • While rollback functionality is available, it may not always guarantee a complete and error-free rollback, depending on the nature of the changes.
  • As an open-source tool, Liquibase’s support and documentation may not be as comprehensive as commercial database management tools.

What are top Liquibase instruments and tools?

  • Liquibase: Liquibase is an open-source database schema change management tool. It allows developers to track, version, and apply database changes easily. Liquibase has been around since 2006 and is widely used in the software development industry. It supports a variety of database platforms and provides a declarative approach to managing database changes.
  • DBmaestro: DBmaestro is a database release automation and DevOps tool that integrates with Liquibase. It provides additional features such as automated deployments, release management, and change control. DBmaestro enhances Liquibase’s capabilities by adding workflow and governance functionality to the database deployment process.
  • Redgate SQL Source Control: Redgate SQL Source Control is a popular tool used for version controlling databases. It integrates with Liquibase and enables developers to manage database changes alongside their application code. Redgate SQL Source Control provides a seamless experience for developers working with SQL Server databases.
  • Flyway: Flyway is another open-source database migration tool similar to Liquibase. It supports a wide range of databases and provides a simple and easy-to-use approach for managing database changes. Flyway has gained popularity in recent years and is often compared to Liquibase for its simplicity and flexibility.
  • Bamboo: Bamboo is a continuous integration and continuous deployment (CI/CD) tool that supports Liquibase integration. It allows developers to automate the build, test, and deployment processes for their applications, including database changes managed by Liquibase. Bamboo provides a powerful platform for managing the entire software delivery lifecycle.
  • Git: Git is a distributed version control system widely used in software development. It can be used in conjunction with Liquibase to version control database changes alongside application code. Git provides a robust and scalable solution for managing source code and database changes in a collaborative development environment.
  • TeamCity: TeamCity is a popular CI/CD tool developed by JetBrains. It supports Liquibase integration and provides a comprehensive platform for automating the build, test, and deployment processes. TeamCity offers powerful features such as parallel builds, code coverage analysis, and artifact management.
  • Jenkins: Jenkins is an open-source automation server widely used for CI/CD pipelines. It supports Liquibase integration through various plugins, enabling developers to automate database change management as part of their build and deployment processes. Jenkins provides a flexible and extensible platform for continuous integration and delivery.
  • Azure DevOps: Azure DevOps is a comprehensive set of development tools provided by Microsoft. It includes features for source control, build automation, and release management. Azure DevOps supports Liquibase integration, allowing developers to manage database changes alongside their application code in a single platform.
  • AWS CloudFormation: AWS CloudFormation is an infrastructure-as-code service offered by Amazon Web Services. It allows developers to define and provision their cloud resources using a template-based approach. AWS CloudFormation supports Liquibase integration, enabling developers to manage database changes as part of their infrastructure deployment process.

Cases when Liquibase does not work

  1. Unsupported Database: Liquibase is designed to work with a wide range of databases, but there may be certain databases that are not supported. It is important to check the Liquibase documentation to ensure compatibility with your specific database management system.
  2. Version Conflicts: Liquibase relies on specific versions of database drivers and libraries. If there is a version conflict between Liquibase and your database environment, it may cause issues and prevent Liquibase from functioning correctly. It is recommended to verify the compatibility of the versions you are using.
  3. Incorrect Configuration: Liquibase requires a properly configured changelog file to manage database changes. If the configuration is incorrect or if the changelog file is not properly defined, Liquibase may fail to execute the desired changes. It is crucial to review the Liquibase documentation and ensure the correct configuration is in place.
  4. Permissions and Privileges: Liquibase needs appropriate permissions and privileges to execute database changes. If the user executing Liquibase does not have the necessary rights, it may result in failure to apply changes. Ensure that the user has the required permissions to modify the database schema.
  5. Unsupported Change Types: Liquibase supports a wide range of change types, such as adding tables, modifying columns, or inserting data. However, there might be specific change types that are not supported by Liquibase or require additional customization. It is important to consult the Liquibase documentation and validate if the desired change types are supported.
  6. Complex Database Structures: Liquibase is highly capable of managing database changes, but there might be cases where very complex or intricate database structures pose challenges. In such scenarios, implementing changes with Liquibase might require additional effort or customization to handle the complexity effectively.

TOP 10 Liquibase Related Technologies

  • Java

    Java is a widely used programming language for Liquibase software development. It offers a robust and secure environment for building scalable applications. With its extensive libraries and frameworks, Java enables developers to create modular and maintainable code.

  • Spring Framework

    Spring Framework is a popular choice for Liquibase software development due to its lightweight and flexible nature. It provides a comprehensive set of features for building enterprise-level applications. With Spring, developers can easily integrate different components and manage dependencies efficiently.

  • JavaScript

    JavaScript is essential for frontend development in Liquibase software projects. It is a versatile scripting language that allows developers to create interactive user interfaces and dynamic web applications. With frameworks like React and Angular, JavaScript enhances the user experience and enables seamless integration with backend systems.

  • Python

    Python is a powerful and easy-to-learn language that is widely used in Liquibase software development. It offers a clean syntax and a vast ecosystem of libraries and frameworks. Python’s simplicity and readability make it an excellent choice for tasks like data analysis, scripting, and web development.

  • SQL

    SQL is a fundamental technology for Liquibase software development, especially when working with databases. It is a language used to manage and manipulate relational database systems. Developers use SQL to create, modify, and query databases, allowing for efficient data retrieval and storage.

  • Git

    Git is a version control system widely used in Liquibase software development. It allows developers to track changes in their codebase, collaborate with others, and easily revert to previous versions if needed. Git enables efficient code management and ensures the integrity of the software throughout the development process.

  • Docker

    Docker is a popular tool for containerization in Liquibase software development. It allows developers to package applications and their dependencies into containers, ensuring consistency and portability across different environments. Docker simplifies the deployment process and enhances scalability and resource utilization.

TOP 10 Tech facts and history of creation and versions about Liquibase Development

  • Liquibase is an open-source database change management tool that follows the principles of continuous integration and source control. It was created in 2006 by Nathan Voxland.
  • The initial version of Liquibase was developed to address the need for a database version control system that could be easily integrated into existing software development processes.
  • One of the groundbreaking features of Liquibase is its ability to track and manage database changes using XML or JSON-based configuration files, allowing for easy collaboration and versioning.
  • Liquibase supports a wide range of database management systems, including Oracle, MySQL, PostgreSQL, SQL Server, and many others, making it a versatile tool for database development and deployment.
  • In 2011, Liquibase introduced the Liquibase Hub, a web-based platform for managing and tracking database changes across different environments, providing a centralized view of all database change activities.
  • With its support for database refactorings, Liquibase allows developers to make structural changes to the database schema while preserving existing data, reducing the risk of errors and data loss.
  • Liquibase follows a “database as code” approach, treating database changes as code artifacts that can be versioned, reviewed, and deployed, ensuring that database changes are treated with the same rigor as application code changes.
  • Liquibase is continuously evolving, with frequent releases and updates. As of 2021, the latest stable version is 4.3.5, which includes various enhancements, bug fixes, and improved support for cloud-based database platforms.
  • The Liquibase community is vibrant and active, with a dedicated group of contributors and users who actively participate in forums, GitHub discussions, and meetups, fostering collaboration and knowledge sharing.
  • Liquibase has gained widespread adoption in the software development industry, trusted by companies ranging from startups to large enterprises, making it one of the most popular tools for managing database changes.

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