Hire the best J2EE Developers in California

Check out J2EE Developers in California with the skills you need for your next job.
  • $80 hourly
    As a passionate software developer based in California, I've always been drawn to the dynamic world of web and software development. My journey has led me to specialize in both coding and managing websites with WordPress, significantly expanding my portfolio. I thrive in environments that challenge my adaptability and problem-solving skills, whether working solo or collaborating with teams. I take pride in my ability to dive into complex projects, guiding them from conception to launch. My technical background is diverse, spanning the creation of large-scale applications designed for client interaction to implementing cutting-edge, open-source technologies that push the boundaries of innovation. Currently, I am focused on deepening my knowledge and skills in web development, data visualization, and game/engine development to enhance my visibility in the industry. My toolset includes Java, J2EE, Spring Technologies, and I'm equally proficient in frontend and backend development with technologies like PHP, Node.js, and modern frameworks such as React, Vue.js, and Angular. Effective communication is key to my workflow, ensuring clear and productive interactions with both technical and non-technical colleagues. I am naturally inquisitive and quick to adapt, always eager to explore new technologies and tackle the next challenge. My approach to projects is methodical and efficient, which allows me to exceed expectations and meet deadlines consistently. Areas of Expertise: Programming Languages: Java, J2EE, Spring: Deep expertise in building robust backend applications. PHP, Node.js: Skilled in dynamic server-side development. JavaScript (Angular, React, Vue.js): Proficient in creating interactive and responsive client-side interfaces. Python: Proficient in Python programming, emphasizing automation, data analysis, and backend solutions. Web Development: Skilled in a broad range of web development techniques and technologies, catering to both frontend and backend needs. Others: C, C++, RESTful and SOAP APIs, SQL, Hibernate, Maven, Gradle, Microservices. Web Development: WordPress: Advanced experience in developing and managing websites, enhancing user experience and site functionality. Full Stack Development: Comprehensive ability to handle both frontend visuals and backend functionality seamlessly. Soft Skills: Communication: Excel at articulating project goals and technical details clearly, ensuring all team members are aligned. Initiative and Agility: Motivated by new challenges, I approach projects with enthusiasm and a readiness to innovate. Time Management: My projects are not only completed within deadlines but also with a quality that often surpasses expectations. I'm excited about the future projects and opportunities that lie ahead, and I'm always looking for ways to contribute to and learn from the vibrant tech community here in California.
    vsuc_fltilesrefresh_TrophyIcon J2EE
    Amazon Web Services
    Web Application
    React
    Angular
    Node.js
    RESTful API
    C++
    Spring Boot
    Kotlin
    SQL
    JavaScript
    Python
    Java
  • $50 hourly
    I specialize in bringing AI to life! 🤖 AI Solutions: I craft tailored AI experiences, from designing intelligent chatbots to sophisticated recommendation engines. My work includes deploying cutting-edge technologies like NLP, computer vision, and predictive analytics to enhance your marketing strategies. How We'll Work Together: - 🌐 Ideation & Discovery: Together, we'll explore and refine AI and ML concepts that are custom-fitted to your needs, ensuring our goals are perfectly aligned from the start. - 🛠️ Prototyping: I focus on rapid prototyping to quickly bring ideas to life, enhancing your operational efficiency almost immediately. - 🚀 Implementation & Launch: I don't just build solutions; I ensure they work flawlessly in real-world scenarios, delivering continuous value with seamless integration and ongoing optimization. My Approach to Your Success: - ⚡ Swift Value Delivery: I customize the design and tech stack meticulously to deliver outstanding results swiftly. - 🔄 Adaptive Model: Each solution is uniquely crafted to meet your specific business challenges, ensuring flexibility and relevance. Deep Expertise in Tech: - 🗃️ Data Layer Mastery: I handle everything data-related — from robust storage solutions (SQL, MongoDB) to advanced data processing techniques (Python, NumPy) and web scraping (Beautiful Soup, Scrapy). - 🤖 Model Layer Innovation: Utilizing top ML libraries (Scikit-learn, XGBoost) and deep learning frameworks (TensorFlow, PyTorch), I build models that predict, learn, and adapt. - 🎨 Prototyping & Visualization: With tools like Figma, Sketch, XD, and platforms such as Outsystems and Bubble, I turn complex data into actionable insights through powerful visualization platforms like Tableau and Power BI. Specialization: - 🤖 Constructing AI/ML Models: I build models that are not just functional but are also innovative. - 🛠️ Software Development Lifecycle: I manage end-to-end development, ensuring each phase meets high standards. - ⛏️ Building Resilient Data Pipelines: My pipelines are robust, ensuring smooth data flow and integrity. - 🔍 In-depth Data Analysis: I uncover insights that drive decision-making. - **🕷️ Advanced Bot Development & Web Scraping:** I automate and extract valuable data from the web efficiently. Achievements I'm Proud Of: - 👨‍💻 Creating Diverse Workflows & Predictive Models: I've innovated numerous projects that significantly improve user interaction and predictive outcomes. - ⚡ Optimizing Software Applications: I enhance applications to run faster and more efficiently. - 📊 SQL Efficiency: I've restructured SQL queries to reduce load times and increase performance. - 🧐 User-Friendly Dashboards: My dashboards don’t just tell data stories; they make them compelling and easy to understand. Let’s Drive Success Together! 🚀 If you’re ready to transform your business with AI, I’m here to make it happen. Reach out, and let’s discuss how we can achieve great things together!
    vsuc_fltilesrefresh_TrophyIcon J2EE
    Ionic Framework
    Next.js
    MERN Stack
    Web Application
    AWS IoT Analytics
    Chatbot
    Machine Learning
    ChatGPT
    Natural Language Processing
    Artificial Intelligence
    Google Cloud Platform
    Amazon Web Services
    Cloud Computing
  • $110 hourly
    I am a goal-oriented IT professional, having experience in the software development industry. I believe in iterative and incremental agile software development to ensure product quality and satisfy customer needs. I’ve experienced many technologies such as Java, and NodeJs, at the back-end to develop restful web services, and JSP, Angular JS/8 at the front-end. I’ve worked with both relational and non-relational databases, such as MongoDB and MSSQL servers. Being part of self-organizing, cross-functional teams I focus on planning, requirements analysis, design, coding, unit testing, acceptance testing, and delivering a working product to stakeholders. Over time I have acquired proficiency in problem-solving, algorithm designing, OOD, SAAS, SOA, applying design patterns, modeling using UML, architecture designing using blueprints and best practices. Expertise:- Project management: Git, Maven, Confluence, Assembla, Jira, ScrumEdge, Jenkins, Go Server, SonarQube, Microsoft Project Client-Side: HTML5/CSS3, JQuery, Angular.js, Bootstrap.js, Backbone.js, Require.js, Handlebars.js, Underscore.js, i18n, leaflet.js, Node.js, gulp, LESS CSS Core: Angular, Node, Kotlin, Java SE, Java 8, Java Fx, Java EE, EJB 3, Java 7 Concurrency, Spring Web MVC, Spring Security, Apache Velocity, Hibernate, OrmLite, unbounded LDAP SDK, pdfbox, Twilio Java SDK, Clickatell, FastSMS, iText, Jersey JAVA, Apache Jena, .NET Servers: Wildfly, Apache Tomcat, Jetty, GlassFish, LDAP Server Web Services: REST/SOAP Web Services IDE: Eclipse, NetBeans, Visual Studio Databases: MySql, SQL Server, H2 database, Oracle XE, 9i, 10g Unit Testing: JUnit, Hamcrest, Spring test, Selenium Web driver, Mocha, Chai, Sinon
    vsuc_fltilesrefresh_TrophyIcon J2EE
    Kotlin
    Spring MVC
    Angular
    Eclipse IDE
    NetBeans
    Java ME
    Spring Framework
    Node.js
    Spring Boot
    Apache Tomcat
    Java Servlet API
    Apache Maven
    JavaFX
    Java
  • $200 hourly
    I’m a developer with experience in building enterprise-level applications. Whether you need a mobile app, web app, integration, or an e-commerce store - I can help! I’m experienced in Java, React, Node, PHP, Python, Scala, Kotlin, Cloud, and Docker, etc. I’ll fully manage your project from start to finish Regular communication is really important to me, so let’s keep in touch!
    vsuc_fltilesrefresh_TrophyIcon J2EE
    Kubernetes
    DevOps
    Crypto Wallet
    Docker
    Google Cloud Platform
    Blockchain
    Laravel
    Java
    Kotlin
    Flutter
    Python
    React
    React Native
    Swift
  • $75 hourly
    Experienced Software Engineer with a demonstrated history of working in the Computer Software industry. -- Proficient with Python stack - Django & Flask, SQLAlchemy -- Skilled in Java 8+, Spring Boot, Microservices, UI technologies(HTML, CSS, Js, React js), Webservices(SOAP, REST,GraphQL), Databases(SQL - Oracle sql, NoSQL - AWS Dynamo db, Mongo db), Kafka, RabbitMQ and integration technology(MuleSoft). -- Solid understanding of Data Structures and Algorithms, System Designing, OOPs concepts. -- Strong Object Oriented Analysis and Design (OOAD), ERD documentation, UML artifacts modeling with Rational Rose and Enterprise Architect. -- Strong communication, interpersonal and presentation skills with excellent problem solving capabilities.
    vsuc_fltilesrefresh_TrophyIcon J2EE
    SOAP
    React
    JavaScript
    SQL
    Apache Maven
    Amazon Web Services
    Hibernate
    Apache Tomcat
    Java Servlet API
    Spring MVC
    PostgreSQL
    Microservice
    Spring Boot
    Java
  • $65 hourly
    Specialized in web backend development with - Golang - Ruby on Rails - Java/Spring/Hibernate, Java EE I've worked on many projects as a freelance and also as a team member. I participated in developing complex enterprise applications with many integrations with 3rd party services, also worked on health care and fintech projects. Main techstack: - Java stack: Java8+, Spring Boot, Spring Data, Security, JPA, Hibernate, etc. - Golang - Ruby on Rails, Sidekiq - Database: MySQL, PostgreSQL, MongoDB, Redis, etc - JMS, ActiveMQ, RabbitMQ, Apache Kafka My database experience varies from RDBMs (PostgreSQL, MySQL, Oracle, DB2, MSSQL, H2, Sqlite) to NoSQL like MongoDB, Google Big Table, Hbase, Memcache, Firebase. Unit testing, functional testing and TDD is the preferred way of working for me. (This helps to make changes more easily). For the highload projects I could also make performance testing using tools like JMeter.
    vsuc_fltilesrefresh_TrophyIcon J2EE
    Firebase
    HTML5
    Node.js
    JavaScript
    Spring Framework
    Golang
    MySQL
    MongoDB
    PostgreSQL
    Redis
    Java
    Ruby on Rails
    Hibernate
  • $90 hourly
    SUMMARY OF QUALIFICATIONS * Several years of experience in enterprise large scale software development working as architect and technical lead. * Experienced in developing projects based on microservices, distributed multi-tiered, event-driven and service-oriented solutions. * Solid experience in the object-oriented design and implementation for different software architectures and applications.
    vsuc_fltilesrefresh_TrophyIcon J2EE
    API
    Spring Framework
    Database
    JavaScript
    React
    Software Architecture
    Software Design Pattern
    Java
    International Development
    Product Development
    Ecommerce
    Web Development
  • $30 hourly
    Dynamic and results-driven Software Engineer with over a decade of diverse experience in designing, developing, and optimizing scalable software solutions. Proficient in Java (8–21), Spring Boot, Angular, and back-end system architecture, with a strong focus on microservices, API integration, and data visualization. Skilled in building high-performance, secure platforms and leading cross-functional teams to deliver innovative solutions. Currently expanding expertise in cloud infrastructure with a focus on AWS, actively pursuing certifications and hands-on projects to deepen proficiency. Eager to embrace new challenges and explore learning opportunities in emerging technologies and collaborative environments. Key Highlights • Backend Development: Engineered robust solutions for SMS gateways, data-heavy applications, and real-time scheduling using Spring Batch, Quartz, and REST APIs. • Front-End Mastery: Delivered 50+ interactive dashboards using Angular and Syncfusion, significantly enhancing user experience and analytical capabilities. • Enterprise Solutions: Streamlined turbine maintenance workflows and developed mobile applications with Xamarin and ASP.NET, boosting customer satisfaction by 35%. • IoT Expertise: Innovated smart metering solutions, optimizing data transmission and integrating advanced protocols with Sigfox IoT environments. • Software Optimization: Revamped legacy systems, enhancing performance via JavaFX, JNI, and JPA, reducing processing times by 30%. Technical Proficiencies • Languages: Java, C#, C++, JavaScript • Frameworks: Spring Boot, Angular, ASP.NET, Xamarin, J2EE • Cloud Technologies: AWS (in progress) • Databases: Oracle, My SQL, MS SQL • DevOps: Git, GitLab, CI/CD pipelines • Testing Tools: JMeter, Arquillian • Visualization: Prometheus, Grafana, Syncfusion, DevExpress
    vsuc_fltilesrefresh_TrophyIcon J2EE
    Data Visualization
    Angular
    Windows Presentation Foundation
    Xamarin
    WordPress Development
    SQL
    Spring Boot
    Java
    C#
    Desktop Application
    App Development
    Web Application
    Web Development
  • $60 hourly
    SUMMARY Software Developer with over 5 years of experience expertise in Java, J2EE, Spring, and microservices. Proficient in Agile methodologies, DevOps practices, and all SDLC phases. Skilled in web and enterprise application development, SQL and NoSQL databases, AWS, and JavaScript frameworks (AngularJS, React.js). Experienced in microservices integration, client-side development, and deployment on Apache Tomcat and WebSphere. Familiar with CICD tools (Maven, ANT), version control (Git, SVN), and performance testing (JMeter).
    vsuc_fltilesrefresh_TrophyIcon J2EE
    Product Management
    Scrum
    Microservice
    Spring Boot
    Java Collections Framework
    Web Development
  • $30 hourly
    I am Avraham Charchian and I am an experienced programmer and web designer, with skills in many popular languages and technologies, As a Developer, I learned to design the code clean, cohesive, modularize and scalable, yet loosely couple to attain maximum flexibility and performance. I'm specialized in creating new and improving existent applications using the latest technologies, both in front and back end since 2003. I am fluent and proficient developing under many languages, including: C#, Java, J2ee, WPF, Asp.net also have extensive experience with front-end development using the best practices in Javascript, CSS, jQuery, and HTML. Custom-designed Interactive Sites: I can cater your site to the precise level of interaction you prefer. Your website can be customized to be highly interactive, allowing you to follow-up and easily make changes as your business grows and develops. As an alternative, you can retain my services for future consulting and site maintenance on an as-needed basis. Communication: I am a full-time freelancer, available virtually anytime for design, updates, quick fixes, or consultation. My work style is highly adaptable to each my clients’ unique needs. You can be as involved or as detached as you wish. If you like to be included in every aspect of the design and development, I’m your guy. If you want to take a hands-off approach, preferring instead to focus on your busy schedule, I take the initiative and handle your project in its entirety until it’s ready for your review. Skills: - Programming languages: Asp.Net, Web API, Web Service, J2EE , WPF , Java, Javascript, C# and to an extent VB.NET. Also classic languages like VB6. - Web Design and related: AJAX, Bootstrap, xhtml, HTML, HTML5, JavaScript, jQuery, CSS, JSF, JSP - Databases: General and advanced SQL, excellent knowledge of MySQL and MS SQL including replication, table partitionning and schema optimization. Also Oracle and Access,PL/Sql, JDBC. - ORM : Entity Framework, Hibernate. - Designs : Photoshop - Miscellaneous APIs: Facebook, Twitter, Instagram, Google Map, Google Custom Search, Youtube, Linkedin, oAuth, Amazon, eBay - Frameworks : Struts, Spring, - Tools and component: Telerik, DevExpress, SAX parse, Primefaces, Richfaces. - IDE : Eclipse,Net-beans, Intelligent-Idea - server tools: IIS, Tomcat Linkedin: www.linkedin.com/in/peymancharchian
    vsuc_fltilesrefresh_TrophyIcon J2EE
    Oracle PLSQL
    Windows Presentation Foundation
    Spring Framework
    Web Service
    C#
    ASP.NET
    Hibernate
    Web Design
    Web Development
  • Want to browse more freelancers?
    Sign up

How hiring on Upwork works

1. Post a job

Tell us what you need. Provide as many details as possible, but don’t worry about getting it perfect.

2. Talent comes to you

Get qualified proposals within 24 hours, and meet the candidates you’re excited about. Hire as soon as you’re ready.

3. Collaborate easily

Use Upwork to chat or video call, share files, and track project progress right from the app.

4. Payment simplified

Receive invoices and make payments through Upwork. Only pay for work you authorize.

Trusted by 5M+ businesses