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Nikita P., Java Developer, Back-End Engineer

Last Updated: 4 Jul 2023
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Sergey S., Java Engineer

Last Updated: 4 Jul 2023

- 6+ years of professional expertise in the IT industry; - Solid experience in Java and related technologies; - Hands-on experience with Microservices architecture; - Experience in the development of Enterprise applications using Java and JEE Technologies; - Database structure design and development; - Domain and business process analysis and modeling - Upper-Intermediate English - Available ASAP

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Roman P., Senior Java Developer

Last Updated: 4 Jul 2023

- Java Developer with 5+ years of experience. - Upper-Intermediate English.

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Evgeniy K., Java Developer

Last Updated: 6 Oct 2023

- 4+ years of experience in Java development - Strong knowledge in programming Spring Framework, Hibernate, and Java Core - Experience in using Design patterns - Good logical thinking and self-learning abilities - High level of responsibility and commitment - Knowledge of SCRUM and TDD development methodologies - Upper-intermediate level of spoken and written English - Master's degree in Mechanical Engineering - Experience in various projects, including Saas platforms, online systems, and business automation solutions - Strong understanding of software development principles, paradigms, and patterns - Proficient in SDLC and software development practices - Expertise in back-end development, bug fixing, and new feature development - Strong problem-solving and analytical skills - Excellent communication and teamwork abilities

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Java   4 yr.

Spring Framework

Spring Framework   4 yr.

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Vladyslav A., Java Software Engineer

Last Updated: 26 Sep 2023

- 5+ years experience in the IT industry working with Java and related technologies. - Good knowledge in programming Spring Framework, Hibernate, and Java Core. - Has experience with microservices architecture. - In-depth knowledge of database systems, especially PostgreSQL, and related migration tools like Flyway and Liquibase. - Proficient in AWS services such as Elastic Kubernetes Service (EKS), PostgreSQL, DynamoDB, S3, and more. - Proficiency with messaging systems like Kafka and RabbitMQ. - Demonstrated history of working on innovative projects within the green technology domain, including sophisticated statistical analysis for order processing. - Proficient in implementing and maintaining security protocols and access control using Spring Security. - Upper-Intermediate English.

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Henry Akwerigbe
Henry Akwerigbe
This is a super team to work with. Through Upstaff, I have had multiple projects to work on. Work culture has been awesome, teammates have been super nice and collaborative, with a very professional management. There's always a project for you if you're into tech such Front-end, Back-end, Mobile Development, Fullstack, Data Analytics, QA, Machine Learning / AI, Web3, Gaming and lots more. It gets even better because many projects even allow full remote from anywhere! Nice job to the Upstaff Team 🙌🏽.
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I have been working with Upstaff for over a year on a project related to landscape design and management of contractors in land design projects. During the project, we have done a lot of work on migrating the project to a multitenant architecture and are currently working on new features from the backlog. When we started this project, the hiring processes were organized well. Everything went smoothly, and we were able to start working quickly. Payments always come on time, and there is always support from managers. All issues are resolved quickly. Overall, I am very happy with my experience working with Upstaff, and I recommend them to anyone looking for a new project. They are a reliable company that provides great projects and conditions. I highly recommend them to anyone looking for a partner for their next project.
Владислав «Sheepbar» Баранов
Владислав «Sheepbar» Баранов
We've been with Upstaff for over 2 years, finding great long-term PHP and Android projects for our available developers. The support is constant, and payments are always on time. Upstaff's efficient processes have made our experience satisfying and their reliable assistance has been invaluable.
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I worked with Upstaff engineers for over 2 years, and my experience with them was great. We deployed several individual contributors to clients' implementations and put up two teams of upstaff engineers. Managers' understanding of tech and engineering is head and shoulders above other agencies. They have a solid selection of engineers, each time presented strong candidates. They were able to address our needs and resolve things very fast. Managers and devs were responsive and proactive. Great experience!
Yanina Antipova
Yanina Antipova
Хочу виразити велику подяку за таку швидку роботу по підбору двох розробників. Та ще й у такий короткий термін-2 дні. Це мене здивувало, адже ми шукали вже цілий місяць. І знайдені кандидати нам не підходили Це щось неймовірне. Доречі, ці кандидати працюють у нас і зараз. Та надать приклад іншим працівникам. Гарного дня!)
Наталья Кравцова
Наталья Кравцова
I discovered an exciting and well-paying project on Upstaff, and I couldn't be happier with my experience. Upstaff's platform is a gem for freelancers like me. It not only connects you with intriguing projects but also ensures fair compensation and a seamless work environment. If you're a programmer seeking quality opportunities, I highly recommend Upstaff.
Leaving a review to express how delighted I am to have found such a great side gig here. The project is intriguing, and I'm really enjoying the team dynamics. I'm also quite satisfied with the compensation aspect. It's crucial to feel valued for the work you put in. Overall, I'm grateful for the opportunity to contribute to this project and share my expertise. I'm thrilled to give a shoutout and recommendation to anyone seeking an engaging and rewarding work opportunity.

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Our journey starts with a 30-minute discovery call to explore your project challenges, technical needs, and team diversity. Meet Carefully Matched Java Talents. Within 1-3 days, we’ll share profiles and connect you with the right talents for your project. Schedule a call to meet engineers in person. Validate Your Choice. Bring a new Java developer on board with a trial period to confirm that you’ve hired the right one. There are no termination fees or hidden costs.

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Upstaff Managers conduct an introductory round with potential candidates to assess their soft skills. Additionally, the talent’s hard skills are evaluated through testing or verification by a qualified developer during a technical interview. The Upstaff Staffing Platform stores data on past and present Java candidates. Upstaff managers also assess talent and facilitate rapid work and scalability, offering clients valuable insights into their talent pipeline. Additionally, we have a matching system within the platform that operates in real-time, facilitating efficient pairing of candidates with suitable positions.

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Table of Contents

TOP 10 Java Related Technologies

  • Java

    Java is the most popular and widely used programming language for software development. It is known for its simplicity, versatility, and platform independence. With its robust ecosystem and vast library of reusable code, Java is an excellent choice for building scalable and reliable applications.

  • Spring Framework

    Spring is a powerful and widely adopted framework for Java application development. It provides a comprehensive set of lightweight modules that can be used to build enterprise-level applications. Spring’s features such as dependency injection, aspect-oriented programming, and MVC architecture make it a favorite among developers.

  • Hibernate

    Hibernate is a widely used object-relational mapping (ORM) framework for Java. It simplifies the process of mapping Java objects to database tables and provides automatic CRUD (Create, Read, Update, Delete) operations. With Hibernate, developers can focus on business logic instead of dealing with low-level database operations.

  • Apache Maven

    Apache Maven is a powerful build automation tool widely used in Java projects. It simplifies the build process and manages project dependencies. Maven provides a standard project structure, easy dependency management, and a vast repository of open-source libraries, making it an essential tool for Java developers.

  • JUnit

    JUnit is a popular testing framework for Java applications. It provides a simple and elegant way to write automated tests, ensuring the quality and reliability of the code. JUnit’s annotations and assertions make it easy to write test cases and perform various types of testing, including unit testing and integration testing.

  • Apache Tomcat

    Apache Tomcat is a widely used web server and servlet container for Java applications. It provides a robust and scalable environment for deploying Java web applications. With its lightweight footprint and support for Java Servlet, JavaServer Pages (JSP), and JavaServer Faces (JSF), Tomcat is the go-to choice for hosting Java web applications.

  • Eclipse IDE

    Eclipse is a popular integrated development environment (IDE) for Java development. It offers a range of features such as code editing, debugging, version control integration, and support for various plugins. Eclipse’s extensive ecosystem and community support make it a preferred choice for Java developers.

Cases when Java does not work

  1. Unsupported Operating Systems: Java may not work on certain operating systems that are not officially supported by Oracle. For example, Java support was discontinued for older versions of Windows such as Windows XP. Therefore, if you are running an unsupported operating system, Java may not function properly or may not work at all.
  2. Outdated Java Version: Using an outdated version of Java can lead to compatibility issues and potential security vulnerabilities. If you encounter problems with Java, it is essential to ensure that you have the latest version installed. Oracle regularly releases updates and patches to address known issues and improve Java’s performance.
  3. Browser Compatibility: Java applets are primarily used in web browsers, but some modern browsers no longer support Java applets due to security concerns. For instance, popular browsers like Google Chrome and Microsoft Edge have dropped support for Java applets. Thus, if you rely on Java applets for specific web applications, you may encounter issues if your browser does not support them.
  4. Conflicting Software: Occasionally, conflicts can arise between Java and other software installed on your system. This can result in unexpected errors or crashes. It is crucial to ensure that there are no conflicting programs or applications that interfere with Java’s operation. Resolving conflicts may involve updating or removing conflicting software.
  5. Hardware Limitations: In rare cases, Java may not work on certain hardware configurations due to compatibility issues. This can occur if the hardware lacks the necessary components or drivers required to run Java applications. If you experience difficulties running Java on your specific hardware, it is advisable to check for any hardware limitations or seek assistance from the hardware manufacturer.

TOP 13 Facts about Java

  • Java was developed by James Gosling and his team at Sun Microsystems in the mid-1990s.
  • Java is a general-purpose, high-level programming language that is designed to be platform-independent.
  • One of the key features of Java is its “write once, run anywhere” principle, which means that Java code can run on any device or operating system that has a Java Virtual Machine (JVM) installed.
  • The JVM is responsible for executing Java bytecode, which is the compiled form of Java source code.
  • Java is an object-oriented programming language, which means that it uses objects to represent and manipulate data.
  • Java has a rich set of libraries and APIs (Application Programming Interfaces) that provide developers with a wide range of pre-built functionality.
  • Java is widely used for developing various types of applications, including web applications, mobile apps, desktop software, and enterprise systems.
  • Java is used by many large organizations and companies, including Google, Amazon, and Netflix.
  • Java is known for its strong emphasis on security, with features such as automatic memory management and built-in support for cryptography.
  • Java is regularly updated with new features and improvements. The latest major version of Java is Java 16, which was released in March 2021.
  • Java has a large and active community of developers, who contribute to open-source projects, share knowledge, and provide support to fellow developers.
  • Java is also popular for its compatibility with other programming languages, as it can be easily integrated with languages such as C, C++, and Python.
  • Java is widely used in computer science education and is often taught as a first programming language in universities and schools.

How and where is Java used?

Case NameCase Description
Android App DevelopmentJava is widely used for developing Android applications. It provides a robust and efficient platform for building native Android apps. Java’s object-oriented nature and extensive libraries make it easy to create feature-rich and interactive mobile applications. With access to powerful APIs, developers can leverage Java’s capabilities to build apps that cater to various user requirements.
Enterprise Software DevelopmentJava is a popular choice for developing enterprise software applications. Its scalability, platform independence, and extensive ecosystem of frameworks and tools make it suitable for building large-scale, mission-critical systems. Java’s robustness and reliability ensure that enterprise applications can handle high loads, perform complex tasks, and integrate with other systems seamlessly.
Web Application DevelopmentJava is widely used for building web applications. With frameworks like Spring and JavaServer Faces (JSF), developers can create scalable and secure web applications that can handle heavy traffic and complex business logic. Java’s compatibility with different web servers and databases allows for easy integration and deployment across various platforms.
Big Data ProcessingJava is extensively used for processing and analyzing big data. Apache Hadoop, a popular big data processing framework, is built using Java. Java’s ability to handle large volumes of data and its support for parallel processing make it an ideal choice for developing big data applications. Additionally, Java’s integration with Apache Spark enables efficient data processing and analysis.
Internet of Things (IoT) DevelopmentJava is widely used in IoT development due to its platform independence and compatibility with embedded systems. It provides a secure and scalable environment for developing IoT applications. Java’s libraries and frameworks enable developers to connect and control various IoT devices, collect data, and perform real-time analytics.
Game DevelopmentJava is utilized in game development due to its performance, cross-platform compatibility, and extensive libraries. Game engines like LibGDX and jMonkeyEngine leverage Java’s capabilities to create high-quality and immersive gaming experiences. Java’s support for 2D and 3D graphics, audio processing, and input handling makes it suitable for developing games across different platforms.
Financial and Trading SystemsJava is widely used in the finance and trading industry for developing robust and high-performance systems. Its support for multi-threading, distributed computing, and real-time data processing makes it suitable for building trading platforms, algorithmic trading systems, and risk management applications. Java’s security features also ensure the integrity and confidentiality of financial data.

What are top Java instruments and tools?

  • Eclipse: Eclipse is a popular Java integrated development environment (IDE) that was first released in 2001. It is widely used by developers for Java application development and offers a rich set of features such as code editing, debugging, and refactoring. Eclipse has a large ecosystem of plugins and extensions that enhance its functionality, making it a versatile tool for Java development.
  • IntelliJ IDEA: IntelliJ IDEA is another powerful Java IDE that was developed by JetBrains. It was first released in 2001 and has gained a strong following among Java developers. IntelliJ IDEA offers advanced code analysis, intelligent code completion, and built-in tools for testing and debugging. It is known for its user-friendly interface and productivity-enhancing features.
  • Apache Maven: Apache Maven is a build automation tool for Java projects. It was initially released in 2004 and has become one of the most widely used build tools in the Java ecosystem. Maven uses a declarative approach to define project configurations and handles dependency management, build lifecycles, and project reporting. It simplifies the build process and promotes project consistency and scalability.
  • Gradle: Gradle is a modern build tool that was first introduced in 2009. It combines the best features of Apache Maven and Apache Ant, offering a flexible and efficient build system. Gradle uses a Groovy-based domain-specific language (DSL) for build scripts and provides powerful dependency management capabilities. It is known for its performance and scalability, making it a popular choice for large-scale Java projects.
  • JUnit: JUnit is a widely used testing framework for Java applications. It was initially released in 1997 and has since become the de facto standard for unit testing in the Java community. JUnit provides a simple and elegant way to write and execute tests, allowing developers to ensure the correctness of their code. It integrates well with popular IDEs and build tools, making it easy to incorporate testing into the development workflow.
  • Spring Framework: The Spring Framework is a comprehensive Java framework that provides a wide range of features for building enterprise applications. It was first released in 2004 and has gained widespread adoption in the Java community. Spring offers dependency injection, aspect-oriented programming, and support for various other technologies such as transaction management and web development. It promotes modular and loosely coupled application architectures, making it easier to develop and maintain complex Java applications.
  • Apache Tomcat: Apache Tomcat is an open-source web server and servlet container that is widely used for deploying Java web applications. It was initially released in 1999 and has become one of the most popular choices for hosting Java-based web applications. Tomcat provides a lightweight and efficient runtime environment for Java Servlets and JavaServer Pages (JSP). It is known for its stability, performance, and easy configuration.

Pros & cons of Java

7 Pros of Java

  • Java is platform-independent, which means it can run on any platform without the need for recompilation. This makes it highly versatile and compatible with various operating systems.
  • Java is highly popular and widely used, which means there is a large community of developers who can provide support and resources. This makes it easier to find solutions to problems and access libraries and frameworks.
  • Java has a strong focus on security, with built-in mechanisms such as sandboxing and automatic memory management to prevent common vulnerabilities like buffer overflows and memory leaks.
  • Java has a vast ecosystem of libraries and frameworks that provide ready-to-use functionality for common tasks, reducing development time and effort. Examples include Spring, Hibernate, and Apache Commons.
  • Java has excellent performance optimization features, such as just-in-time (JIT) compilation, which translates bytecode into machine code at runtime for faster execution.
  • Java supports multithreading, allowing developers to write concurrent programs and take advantage of the increasing number of multi-core processors for improved performance.
  • Java has extensive documentation and a mature development environment, which includes tools like Eclipse and IntelliJ IDEA, making it easier for developers to write, test, and debug their code.

7 Cons of Java

  • Java has a steeper learning curve compared to some other programming languages, which may require more time and effort for beginners to become proficient.
  • Java can be memory-intensive, especially in enterprise applications, which may require careful optimization and management of memory resources.
  • Java applications can have longer startup times due to the need for JVM (Java Virtual Machine) initialization and the loading of necessary libraries.
  • Java’s strict type system can sometimes be restrictive and require more verbose code compared to dynamically-typed languages.
  • Java’s performance can be affected by the overhead of garbage collection, which periodically frees up memory occupied by unreferenced objects.
  • Java’s GUI (Graphical User Interface) development can be complex and less intuitive compared to other languages and frameworks.
  • Java’s backward compatibility can sometimes lead to the accumulation of legacy code and dependencies, making it harder to keep up with the latest advancements in the language.

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 the development and maintenance of software applications, under the guidance of senior team members. Perform code reviews, bug fixes, and feature enhancements. Collaborate with the team to understand project requirements and contribute to the overall development process.45,000 – 65,000
Middle2-5 yearsTake ownership of specific modules or components within a software application. Develop new features, optimize code, and troubleshoot issues. Collaborate with cross-functional teams to gather requirements and provide technical guidance. Mentor junior developers and ensure adherence to coding standards.65,000 – 90,000
Senior5-10 yearsLead the development of complex software applications, including architectural design, coding, and testing. Provide technical expertise and guidance to the team. Collaborate with stakeholders to define project goals and ensure timely delivery. Mentor and coach team members, conduct code reviews, and drive quality improvement initiatives.90,000 – 120,000
Expert/Team Lead10+ yearsManage a team of developers and oversee multiple projects. Define technical strategies, establish coding standards, and ensure adherence to best practices. Lead architectural design and provide guidance on complex technical challenges. Collaborate with stakeholders to align technical solutions with business objectives. Drive innovation and continuous improvement within the team.120,000 – 150,000+

Soft skills of a Java Developer

Soft skills are essential for Java Developers as they contribute to effective collaboration, communication, and problem-solving abilities in a team environment. Here are the key soft skills required at different levels of expertise:


  • Adaptability: Ability to quickly learn and adapt to new technologies and frameworks.
  • Teamwork: Willingness to work collaboratively with other team members and contribute to the team’s success.
  • Communication: Strong verbal and written communication skills to effectively convey ideas and discuss technical concepts with team members.
  • Time Management: Efficiently manage time and prioritize tasks to meet project deadlines.
  • Problem-Solving: Analytical thinking and problem-solving skills to identify and resolve software issues.


  • Leadership: Ability to take ownership of tasks and guide junior team members in their work.
  • Mentoring: Willingness to share knowledge and provide mentorship to less experienced developers.
  • Critical Thinking: Ability to think critically and make informed decisions to solve complex problems.
  • Collaboration: Work effectively with cross-functional teams and stakeholders to deliver high-quality software solutions.
  • Adaptability: Quickly adapt to changing project requirements and technology advancements.
  • Communication: Strong interpersonal skills to effectively communicate with team members and stakeholders at all levels.
  • Time Management: Efficiently manage time and prioritize tasks to ensure timely delivery of projects.


  • Strategic Thinking: Ability to align software development strategies with business goals and objectives.
  • Project Management: Experience in managing software development projects, including planning, execution, and delivery.
  • Decision-Making: Sound judgment and decision-making skills to make informed choices on technical solutions.
  • Innovation: Proactively identify opportunities for process improvements and innovation within the development team.
  • Conflict Resolution: Resolve conflicts and facilitate effective communication among team members.
  • Collaboration: Foster a culture of collaboration and knowledge sharing within the team and across departments.
  • Time Management: Efficiently allocate resources and manage project timelines to ensure successful delivery.
  • Communication: Excellent communication skills to effectively convey complex technical concepts to non-technical stakeholders.

Expert/Team Lead

  • Strategic Planning: Develop long-term technical strategies and roadmaps to align with business objectives.
  • Team Management: Lead and motivate a team of developers, providing guidance and support for their professional growth.
  • Decision-Making: Make critical decisions on architectural designs, technology stack, and project priorities.
  • Influence: Influence and negotiate with stakeholders to ensure the successful implementation of technical solutions.
  • Innovation: Foster a culture of innovation, encouraging the exploration of new technologies and approaches.
  • Conflict Resolution: Address conflicts within the team and facilitate open communication and collaboration.
  • Mentoring: Provide mentorship and guidance to junior developers, helping them enhance their technical skills.
  • Communication: Excellent presentation and communication skills to effectively communicate technical concepts to both technical and non-technical audiences.
  • Time Management: Efficiently manage resources and project timelines to deliver high-quality solutions on time.
  • Collaboration: Foster a collaborative environment, promoting knowledge sharing and cross-functional collaboration.
  • Continuous Learning: Stay updated with the latest trends and advancements in Java and related technologies.

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