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Mykhaylo R., DevOps/SRE/Lead System Administrator

Last Updated: 19 Mar 2024
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- Over 20 years in IT with a master's degree in Cybernetics - Proficient in Ansible: Extensive experience in deploying and managing Ansible-driven infrastructure, particularly highlighted in roles as SRE/Architect (Aug 2018 – Present) and Senior DevOps Engineer/Lead Sysadmin (Aug 2020 – May 2021), where Ansible was pivotal in scaling a learning platform from 1,000 to over 100,000 students and in key migration projects. - Expertise in Windows Environments: Demonstrated strong skills in managing Windows environments, especially as an SRE/Architect (Aug 2018 – Present) and CTO (2013 – Mar 2022), involving Windows AD+MSSQL backoffice management and ITIL Service Management framework implementation on Windows platforms. - Versatile IT Roles with Ansible and Windows: Across various roles including IT Service Manager, Senior DevOps Engineer, and CTO, consistently applied Ansible and Windows technologies in large-scale infrastructure projects and day-to-day operations, showing versatility and depth in these areas. - Managing the growth of the learning platform from 1,000+ to 100k+ active students - ITIL v3 Foundations Certificate - More than 5 years of experience in leading ITIL Service Management capability and implementing end-to-end ITIL Service Management framework - Strong experience in using ServiceNow and Jira Service Desk for ITSM - Experienced IT/Telecom Specialist - UNIX and UNIX-Like OS (FreeBSD, Linux, SunOS, MacOS X) background - Over 20 years of Windows/windows server family. From NT4.0 /win3.1 up to Server2019. As well as upgrading Up to 15 years with server HW, and 13 years with storage solutions - Infrastructure problem-solver with a strong view on reliability, performance, and disaster recovery - Fluent English

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Apache Tomcat

Apache Tomcat


Bash   10 yr.

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MySQL   10 yr.



Ansible Playbook

Ansible Playbook

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Andrii P., Java Software Engineer / Team Lead

Last Updated: 29 Aug 2023

- 10+ years of experience in software development using Java/JavaEE stack - Proficient in utilizing a wide range of technologies and tools, such as Spring, Elasticsearch, Apache Kafka, Apache Cassandra, Maven, JUnit/Mockito, Jenkins, Kubernetes, Docker, Git, Hibernate, Play framework, and more. - Skilled in code development, task prioritization, and documentation maintenance. - Mentored junior developers, performed unit and functional testing, and provided documentation maintenance throughout various projects. - Participated in the full life cycle of two large enterprise projects - Practical experience with systems-level designing - Upper-Intermediate English

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Apache Tomcat

Apache Tomcat



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Sunny C., AEM Software Engineer

Last Updated: 18 Mar 2024

Experienced engineer with 11 years of experience in the following areas: - Adobe AEM Lead Developer (AEM 5.6 Lead Developer Certified) - Java, JavaScript (React), Vanilla JS - AEM Component creation (UI as well as server-side), including both reusable and page components with best in standard coding practices - AEM DAM (Digital Asset Management) - Servlet, Job Scheduler, Search Functionality, Email API, Sightly - Workflow implementation - MSM-Creation of multilingual sites using live copy - Selective Dispatcher cache invalidation - Unit testing frameworks, such as JUnit and Mockito. - Source control management tools, such as Apache Subversion, Git - Well-versed with a technical understanding of Extjs, Apache sling, and OSGi, needed for the development of an AEM project, starting from scratch. - Involved in Design, Coding, Testing, Code review, and performance tuning of code and queries.

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Apache Tomcat

Apache Tomcat

Adobe Experience Manager (AEM)

Adobe Experience Manager (AEM)





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TEST - Evgeniy K., Java Developer

Last Updated: 15 Nov 2023

- Software engineer with 5+ years of experience in Java development. - Strong knowledge in programming with expertise in Spring Framework, Hibernate, and Java Core. - Proficient in using Design patterns and applying logical thinking to problem-solving. - Highly responsible and self-learning individual. - Skilled in Java technologies such as JDBC, Maven, JUnit, J2EE, JSP, and Tomcat. - Experience in working with databases like MySQL and PostgreSQL. - Familiarity with development methodologies like SCRUM and TDD.

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Apache Tomcat   5 yr.


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Solidity   10 yr.


Elixir   10 yr.


Sergii Kh., Azure DevOps

Kyiv, Ukraine
Last Updated: 26 Oct 2023

- Experienced software engineer with over 3 years of experience in DevOps engineering and more than 15 years of experience in IT infrastructure; - Proficient in communicating with customers and business stakeholders, troubleshooting and designing IT infrastructure; - Skilled in hardware support for servers of different brands; - Self-educated and continuously growing skills in networking, Windows, VMware products, Cisco, HPE, and Veeam; - Expertise in Azure and AWS clouds, CI/CD, containers (SaaS, PaaS, IaaS, K8S, AKS, Docker, Kubernetes, Swarm), monitoring tools (Zabbix, Prometheus/Grafana, ELK Stack), IAAC (Terraform, Ansible), operating systems (CentOS, RedHat, Ubuntu, OraLinux, FreeBSD), application/web servers (NGINX, Apache, Tomcat, WEB hosting), databases (Azure SQL, MSSQL, PostgreSQL, MariaDB, MongoDB, MySQL), scripting languages (CSS, HTML, PHP, NODE.js, Python, Pascal, PowerShell, BASH), and more; - Certified in Microsoft Azure Fundamentals (AZ-900) and Cisco NETacad; - Extensive experience in implementing CI/CD/CD for CRM systems, launching projects, and resolving architecture issues; - Proven track record in supporting and designing IT infrastructure, coordinating administrators, and providing user support in various organizations.

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Apache Tomcat

Apache Tomcat

Microsoft Azure

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Table of Contents

TOP 10 Apache Tomcat Related Technologies

  • Java Programming Language

    Java is the most fundamental language for Apache Tomcat development. It provides strong support for web application development and is widely used for building enterprise-level applications. With its robust ecosystem, extensive libraries, and cross-platform compatibility, Java remains the go-to language for Tomcat development.

  • Spring Framework

    Spring is a popular framework for building Java-based applications, including those using Apache Tomcat. It offers a comprehensive set of features for developing web applications, such as dependency injection, aspect-oriented programming, and MVC architecture. Spring’s integration with Tomcat simplifies the development process and improves productivity.


    HTML and CSS are essential technologies for creating the user interface of web applications. Apache Tomcat relies on these markup languages to render web pages and provide a visually appealing experience to users. Understanding HTML and CSS is crucial for front-end development with Tomcat.

  • JavaScript

    JavaScript is a powerful scripting language that enhances the interactivity and functionality of web applications. With JavaScript, developers can create dynamic and responsive user interfaces, validate form inputs, and perform client-side data manipulation. It plays a vital role in Tomcat development by enabling seamless client-server communication.

  • JSP/Servlets

    JavaServer Pages (JSP) and Servlets are key components of Java-based web development. JSP enables the creation of dynamic web pages, while Servlets handle requests and generate responses on the server side. Both technologies are extensively used with Apache Tomcat to build robust and scalable web applications.

  • MySQL

    MySQL is a widely used relational database management system that integrates smoothly with Apache Tomcat. It offers excellent performance, scalability, and reliability for storing and retrieving data in web applications. Understanding how to interact with MySQL databases is essential for Tomcat developers working with data-driven applications.

  • RESTful Web Services

    RESTful web services provide a lightweight, scalable, and flexible approach to building APIs for web applications. Tomcat supports the development and deployment of RESTful services, allowing seamless integration with other systems and enabling efficient communication between different components of an application.

How and where is Apache Tomcat used?

Case NameCase Description
1. Enterprise Web ApplicationsApache Tomcat is widely used for developing enterprise web applications. It provides a robust and scalable environment for hosting Java-based web applications. Tomcat’s lightweight architecture and efficient resource management make it suitable for handling high traffic volumes and ensuring reliable performance.
2. E-Commerce PlatformsTomcat is often employed in the development of e-commerce platforms. Its support for Java Server Pages (JSP) and Java Servlets enables developers to create dynamic and interactive web pages that are essential for online shopping experiences. With Tomcat, developers can build secure and scalable e-commerce applications.
3. Content Management SystemsApache Tomcat is utilized in the development of content management systems (CMS). CMS platforms require a robust and efficient server environment to handle content creation, storage, and retrieval. Tomcat’s stability, extensibility, and support for Java technologies make it an ideal choice for developing CMS applications.
4. Mobile Application BackendTomcat can be used as a backend server for mobile applications. It provides a reliable and scalable infrastructure for managing the data and logic required by mobile apps. Developers can leverage Tomcat’s support for RESTful web services and its integration with other technologies to build efficient and responsive mobile app backends.
5. API DevelopmentApache Tomcat is commonly utilized in the development of APIs (Application Programming Interfaces). APIs enable different software applications to communicate and exchange data. Tomcat’s support for Java-based APIs, such as Java Servlets and JavaServer Pages (JSP), makes it a popular choice for building API endpoints and managing API requests.
6. Web ServicesTomcat is often used for developing and hosting web services. Web services allow different applications to interact with each other over a network. Tomcat’s support for Java technologies, such as Java Servlets and JavaServer Pages (JSP), enables developers to create and deploy web services efficiently and securely.
7. Testing and Development EnvironmentsApache Tomcat is commonly employed in testing and development environments. Its lightweight and easy-to-configure nature makes it an ideal choice for setting up development servers quickly. Developers can use Tomcat to test their applications locally before deploying them to production servers, ensuring smooth development and debugging processes.

Cases when Apache Tomcat does not work

  1. Insufficient memory: Apache Tomcat may fail to work if there is not enough memory available. Tomcat requires a certain amount of memory to run smoothly, and if it exceeds the available memory, it can result in crashes or failures. This can be particularly problematic if the server is running multiple applications or if there are other resource-intensive processes running simultaneously.
  2. Incorrect configuration: Tomcat relies heavily on its configuration files to determine how it should function. If the configuration files are not set up correctly or if there are errors in the configuration, it can cause Tomcat to fail. This can include misconfigured paths, incorrect port numbers, or invalid XML syntax.
  3. Conflicts with other software: Tomcat may encounter issues if there are conflicts with other software or services running on the same server. For example, if there is another web server already using the same port that Tomcat is configured to use, it can prevent Tomcat from starting or cause it to malfunction.
  4. Outdated or incompatible Java version: Tomcat is built on Java, so it relies on a compatible Java runtime environment (JRE) or Java Development Kit (JDK) to function properly. If the installed Java version is outdated or incompatible with Tomcat, it can lead to errors or failures. It is important to ensure that the correct Java version is installed and configured for use with Tomcat.
  5. Security restrictions: In some cases, security restrictions imposed on the server or network environment can prevent Tomcat from working correctly. This can include firewall rules, access control lists, or other security measures that block necessary network traffic or access to required resources.
  6. Corrupted or missing files: Tomcat relies on various files and directories for its operation. If any of these files become corrupted, deleted, or misplaced, it can cause Tomcat to malfunction or fail to start. This can include critical configuration files, libraries, or web application files.

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, working on smaller tasks and projects, learning new technologies and frameworks, following coding standards and best practices.$50,000 – $70,000
Middle2-5 yearsDeveloping software solutions independently, participating in the design and architecture of applications, collaborating with other team members, mentoring junior developers, conducting code reviews, contributing to project planning and estimation.$70,000 – $90,000
Senior5-10 yearsLeading the development of complex features and projects, providing technical expertise and guidance to the team, reviewing and optimizing code for performance and scalability, identifying and resolving technical challenges, collaborating with stakeholders, contributing to system design and architecture decisions.$90,000 – $120,000
Expert/Team Lead10+ yearsLeading a team of developers, managing projects and timelines, making strategic technical decisions, mentoring and coaching team members, collaborating with cross-functional teams, driving innovation and process improvements, acting as a technical advisor to the management, ensuring high-quality delivery of software solutions.$120,000 – $150,000+

Pros & cons of Apache Tomcat

9 Pros of Apache Tomcat

  • 1. Lightweight: Apache Tomcat is known for its lightweight nature, making it efficient and fast in terms of performance.
  • 2. Java-based: As a Java-based web server, Apache Tomcat offers excellent compatibility with Java applications and frameworks.
  • 3. Easy to use: With its simple configuration and deployment process, Apache Tomcat is user-friendly and suitable for developers of various skill levels.
  • 4. Robust security: Apache Tomcat provides several security features, including SSL/TLS support, access control, and integration with external authentication mechanisms.
  • 5. Scalability: Tomcat can handle high traffic and large user loads, making it suitable for applications that require scalability.
  • 6. Extensible: Apache Tomcat supports a wide range of extensions and plugins, allowing developers to customize and enhance its functionality.
  • 7. Active community support: Being an open-source project, Apache Tomcat has a vibrant community that provides constant updates, bug fixes, and support.
  • 8. High availability: Tomcat supports clustering and session replication, ensuring high availability and fault tolerance for web applications.
  • 9. Cost-effective: Apache Tomcat is free to use and distribute, making it a cost-effective choice for organizations.

9 Cons of Apache Tomcat

  • 1. Configuration complexity: While Apache Tomcat is generally easy to use, its configuration can become complex for advanced setups or specific requirements.
  • 2. Limited support for non-Java languages: Although Tomcat primarily focuses on Java applications, it has limited support for non-Java languages like PHP or Python.
  • 3. Memory management: Tomcat’s memory management can be challenging, requiring fine-tuning and optimization for optimal performance.
  • 4. Lack of built-in monitoring tools: Apache Tomcat lacks comprehensive built-in monitoring and management tools, requiring additional setup for monitoring purposes.
  • 5. Learning curve: While Tomcat is relatively straightforward for basic usage, mastering advanced features and configurations may require a learning curve.
  • 6. Performance overhead: Despite its lightweight nature, Apache Tomcat may introduce some performance overhead compared to more specialized web servers.
  • 7. Limited documentation: While the Apache Tomcat community is active, the official documentation may sometimes lack in-depth explanations or examples.
  • 8. Limited support for web protocols: Tomcat primarily supports HTTP and HTTPS protocols, but lacks built-in support for other protocols like FTP or SMTP.
  • 9. Single-threaded request processing: By default, Apache Tomcat uses a single-threaded model for request processing, which may limit performance in highly concurrent scenarios.

Soft skills of a Apache Tomcat Developer

Soft skills are essential for Apache Tomcat Developers to excel in their roles and collaborate effectively with their teams. These skills go beyond technical expertise and focus on interpersonal and communication abilities.


  • Adaptability: Ability to quickly learn and adapt to new technologies and tools in the Apache Tomcat ecosystem.
  • Teamwork: Willingness to collaborate with team members, share knowledge, and contribute to the success of the project.
  • Problem-solving: Aptitude for identifying and resolving issues, debugging errors, and finding efficient solutions.
  • Time management: Ability to prioritize tasks, meet deadlines, and handle multiple responsibilities efficiently.
  • Communication: Strong verbal and written communication skills to effectively convey ideas and collaborate with stakeholders.


  • Leadership: Capability to take ownership of tasks, guide junior developers, and mentor them in Apache Tomcat development.
  • Critical thinking: Proficiency in analyzing complex problems, evaluating different options, and making informed decisions.
  • Collaboration: Ability to work seamlessly with cross-functional teams, including system administrators, testers, and project managers.
  • Attention to detail: Commitment to delivering high-quality code, conducting thorough testing, and ensuring application stability.
  • Conflict resolution: Skill in resolving conflicts and handling disagreements in a professional and constructive manner.
  • Continuous learning: Eagerness to stay updated with the latest trends and advancements in Apache Tomcat development.
  • Client management: Competence in understanding client requirements, managing expectations, and providing timely updates.


  • Strategic thinking: Capability to envision long-term goals, plan project architecture, and make technology-related decisions.
  • Mentoring: Ability to provide guidance and mentorship to junior and middle-level developers in Apache Tomcat development.
  • Project management: Proficiency in managing complex projects, coordinating tasks, and ensuring timely delivery.
  • Stakeholder management: Skill in effectively communicating with clients, understanding their needs, and building strong relationships.
  • Innovation: Aptitude for identifying opportunities for improvement, implementing innovative solutions, and driving efficiency.
  • Technical documentation: Ability to create comprehensive documentation, including design specifications and user manuals.
  • Presentation skills: Capability to present technical concepts and project updates to both technical and non-technical audiences.
  • Ethical conduct: Commitment to following industry best practices, maintaining code integrity, and ensuring data security.

Expert/Team Lead

  • Strategic planning: Proficiency in defining project roadmaps, setting goals, and aligning them with organizational objectives.
  • Team management: Ability to lead and motivate a team of developers, delegate tasks, and foster a collaborative work environment.
  • Business acumen: Understanding of business requirements, market trends, and the ability to align technology solutions accordingly.
  • Decision-making: Capability to make critical decisions under pressure, considering various factors and mitigating risks.
  • Vendor management: Skill in evaluating and managing relationships with technology vendors and service providers.
  • Conflict resolution: Ability to resolve conflicts within the team or with stakeholders, ensuring a positive work environment.
  • Agile methodologies: Proficiency in Agile development practices, such as Scrum or Kanban, to ensure efficient project execution.
  • Continuous improvement: Commitment to identifying areas of improvement, implementing process enhancements, and fostering innovation within the team.
  • Technical leadership: Capability to guide and influence the technical direction of projects, ensuring alignment with industry best practices.
  • Executive communication: Skill in effectively communicating technical concepts and project updates to executive-level stakeholders.
  • Business development: Acumen for identifying new business opportunities, building client relationships, and contributing to organizational growth.

What are top Apache Tomcat instruments and tools?

  • Apache JMeter: Apache JMeter is an open-source load testing tool that can be used to analyze and measure the performance of Apache Tomcat servers. It was first released in 1998 and has since become a popular tool for load testing web applications. JMeter allows users to simulate various scenarios and analyze the server’s response time, throughput, and resource utilization. It supports multiple protocols and can generate comprehensive reports for performance analysis.
  • Tomcat Manager: Tomcat Manager is a web-based tool provided by Apache Tomcat that allows administrators to manage and monitor Tomcat instances remotely. It provides a user-friendly interface for deploying, undeploying, and restarting web applications. Administrators can also view server status, thread usage, and resource consumption through the Tomcat Manager. It was introduced in Tomcat 5 and has since been a valuable tool for managing Tomcat servers in production environments.
  • VisualVM: VisualVM is a powerful Java profiling tool that can be used to monitor and analyze the performance of Java applications running on Apache Tomcat. It provides real-time information about CPU usage, memory allocation, and thread activity. VisualVM also allows developers to take heap and thread dumps for further analysis. It supports various plugins and is known for its intuitive user interface. VisualVM was first released in 2006 and has since gained popularity among Java developers.
  • Apache Tomcat Native: Apache Tomcat Native is a library that provides Tomcat with native integration capabilities, allowing it to utilize the performance benefits of native web server connectors. It includes native connectors for popular web servers such as Apache HTTP Server and Microsoft IIS. By using Apache Tomcat Native, Tomcat can achieve higher performance and scalability. It was introduced in Tomcat 6 and has been widely used to enhance the performance of Tomcat-based applications.
  • Tomcat Catalina: Tomcat Catalina is the core component of Apache Tomcat, responsible for handling HTTP requests and managing web application lifecycles. It provides a robust and efficient servlet container that complies with the Java Servlet and JavaServer Pages (JSP) specifications. Catalina supports multiple connectors, including HTTP, AJP, and WebSocket, making it suitable for various deployment scenarios. It has been continuously developed and improved since the early versions of Tomcat.
  • Apache Maven: While not specifically designed for Apache Tomcat, Apache Maven is a popular build automation tool widely used in Java development projects. Maven simplifies the process of building, packaging, and deploying applications, including web applications deployed on Tomcat. It manages project dependencies, compiles source code, and generates deployment artifacts. Maven also integrates with Tomcat to facilitate easy deployment and testing of web applications.
  • Tomcat JDBC Pool: Tomcat JDBC Pool is a high-performance database connection pool specifically designed for Apache Tomcat. It provides efficient and reliable database connectivity, improving the overall performance of web applications that rely on database access. The pool implementation includes features such as connection validation, statement caching, and connection leak detection. It has been a recommended choice for managing database connections in Tomcat environments.
  • Tomcat Valve: Tomcat Valve is a powerful mechanism in Apache Tomcat that allows developers to intercept and modify incoming requests and outgoing responses. Valves can be configured to perform various tasks such as authentication, logging, compression, and request filtering. They can be added to the Tomcat server configuration to enhance its functionality and security. Valves have been widely used to customize the behavior of Tomcat servers for specific application requirements.
  • Tomcat Realm: Tomcat Realm is a component in Apache Tomcat that provides a pluggable authentication and authorization mechanism. Realms can be configured to authenticate users against different sources such as databases, LDAP servers, or custom authentication modules. They also handle user authorization based on defined roles and permissions. Tomcat Realm allows developers to integrate Tomcat with various authentication systems and enforce access control in web applications.
  • Apache Tomcat Connectors: Apache Tomcat Connectors, also known as mod_jk, is a module that enables seamless integration between Apache HTTP Server (or other web servers) and Apache Tomcat. It allows requests to be forwarded from the web server to the Tomcat server, providing a unified front-end for serving static and dynamic content. Apache Tomcat Connectors optimize the communication between the web server and Tomcat, improving performance and scalability. It has been widely used in production environments to achieve high availability and load balancing.

TOP 11 Facts about Apache Tomcat

  • Apache Tomcat is an open-source web server and servlet container that is used to serve Java-based web applications.
  • It was initially developed by the Apache Software Foundation (ASF) as a part of the Apache Jakarta Project.
  • Tomcat is written in Java, which makes it platform-independent and allows it to run on various operating systems such as Windows, Linux, and macOS.
  • It supports the Java Servlet, JavaServer Pages (JSP), WebSocket, and Java Unified Expression Language (EL) technologies.
  • Tomcat is known for its lightweight nature, making it efficient in terms of resource utilization and startup time.
  • It has a modular architecture, allowing users to customize and extend its functionality through the use of various plugins and components.
  • Tomcat is widely used in production environments and is considered one of the most popular choices for hosting Java web applications.
  • It has a strong community support with regular updates and bug fixes being provided by the Apache Software Foundation.
  • Tomcat provides a robust security framework, supporting features such as SSL/TLS encryption, access control, and user authentication.
  • It offers high scalability and can handle a large number of concurrent requests, making it suitable for applications with high traffic.
  • Tomcat has been adopted by many major organizations and is used by popular websites such as LinkedIn, Walmart, and The Weather Channel.

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