Enterprise JavaBeans Experts in Cologne
— vetted and available, matched in minutes with AIHire experts who design transactional business services, modernize Java EE applications and integrate EJB with Jakarta EE, application servers and messaging systems. Get precise access to vetted, available freelancers for your project in Cologne and beyond.
Meet FRATCH Experts in Cologne, who have recently used Enterprise JavaBeans
Andreas B.
Last position:
Senior Software Developer at ELIONOVA AG
- Created an application to control measurement hardware with a Tauri application using React.JS and TypeScript on Raspberry Pi
- Developed a cloud application for storing and analyzing measurement results using Spring Boot and React.JS
- Built a Tauri application for printing ZPL labels on Windows
- Technologies: Java, JavaScript, Tauri, Rust, React.JS, AWS, Kubernetes, Docker, GitLab CI/CD, REST API (JSON), Maven, CI/CD, PostgreSQL
Rainer L.
Last position:
Senior IT Consultant, Senior Software Architect, Senior Software Developer, Senior DevOps Engineer at Techniker Krankenkasse
Automation of the database major / minor releases for the TKeasy project
Concept for database major / minor release automation
Assessment of the current state
Evaluation of Redgate Flyway functionalities
Concept development
Products: Redgate Flyway, GitHub, Quest, Erwin Data Modeller, Oracle, Atlassian Jira, Atlassian Confluence
Knowledge: Docker, Continuous Delivery, Continuous Integration, Redgate Flyway, Major Releases, Minor Releases
Allal K.
Last position:
Java Senior Full Stack Developer at Insurance ÖRAG
- Further development of a policy administration system (contract/claims) for the legal expenses insurer ÖRAG.
- My role: Senior Software Developer.
- The team consists of 12 developers.
- Technologies used: Java 8/21, Java EE, Quarkus, WebLogic, JPA, RabbitMQ, JTA, CI, CD, Jenkins, DB2, Maven, Jenkins, GIT (bitbucket) later GitLab, Junit, Elasticsearch, Mockito, Jira, SonarQube, Scrum, React, Workflow
- Migration and modernization of legacy systems: rewrote C and C++ code in Java to improve maintainability, scalability, and performance. Refactored Python into Java, including optimization and integration into modern architectures.
- Study on the use of AI (Codex) for implementing a Java feature. The goal is to compare the time spent and productivity of AI-supported development with a classic implementation by a developer. The results should show how strongly the use of AI affects development time and efficiency.
- Development of the following tariff calculators for the years 2024/2026: private, companies, doctors, farmers, owner-occupied G + H, landlords, traffic, club, top managers, sales representatives, special criminal law, savings bank, municipal, BayGT, doctors, Dehoga
Vladimir M.
Last position:
Developer at Financial services provider
- Support and further development of a framework for developing applications in a banking association: DynS/OSPE
- Migration of the framework to Java 11 and Java 17
- Java8, Java11 and Java17, Spring, Spring-Batch, Spring WebServices, Spring-Security, Spring-Data, JPA, Hibernate, OpenSource libraries etc.
- XML, JAXB, JSON, REST and SOAP services, DB2, Oracle, WebSphere or Liberty AS, FreeMaker, Junit, mock libraries, JaCoCo, Maven, IntelliJ, Eclipse, GitHub, SVN, Jira
Louis N.
Last position:
Specialist in Adobe Experience Manager & Microservices at Nguenkam Consulting & Engineering
Java 11/21
Springboot
Swagger/OpenApi
Azure Pipelines
Trivy Integration
Apache Sling
OSGI
Java Content Repository (JCR)
Apache Jackrabbit Oak
Adobe HTL
GraphQL
Maven
GitLab
IntelliJ
Azure Cloud
Azure DevOps
Terraform
AEM specialist in the Scrum team
Development and deployment of microservices via Open API interfaces
Operation of microservices in the Azure Cloud
Implementation of AEM modules and integration with microservices
Member of the knowledge transfer team and a backend coordination team
Jacqueline H.
Last position:
Kitchen Appliance Manufacturer
Setting up and enhancing an international subscription management system
Migrating and decommissioning a Hybris-SAP system and integrating Zuora
Implementing numerous interfaces to various systems (external and internal)
Setting up and improving monitoring with Grafana, Prometheus, and Databricks
Introducing logging with Loki
Implementing business requirements using jQuery, Thymeleaf, Spring Boot, Java, Go, and Python
Adjusting and extending the GitLab CI pipelines
Setting up and extending infrastructure as code with Terraform and ArgoCD on AWS
Setting up and running E2E and performance tests
Expanding the Databricks business intelligence solution to provide various KPIs
Responsibilities: Architecture, DevOps, development, unit tests, coaching employees and apprentices, E2E, smoke, and integration tests, agile methods consulting (Kanban, Scrum)
Technologies and methods: Java, Go, Kotlin, Node.js, Spring Boot, SOAP/REST, Quarkus, Thymeleaf, Vaadin, Slack, Jira, Confluence, IntelliJ, GitLab, SQS, Kafka, AWS, Kubernetes, Terraform, Maven, Gradle, GitLab CI, Databricks
Last position:
Rewe Digital
- Creation of Spring Boot integration tests
- Creation of JUnit tests for the coupon system
- Creation of component tests for Kafka topics
- Creation of CI/CD pipeline scripts
- Creation of UI tests with Playwright
- Creation of UI tests with Cypress
- Review of developer unit tests
- Planning the test architecture for integration tests
- Creation of the test automation concept
- Evaluation and creation of test reports
Fabian Z.
Last position:
Freelance IT Specialist
IT specialist Application Engineering / Software Development since 2012
Discover over 15,000 top freelancers
Statistics of experts using Enterprise JavaBeans
Aggregated from the professional profiles of matched freelancers.
Experience
26 years (Germany: 25 years)
Position duration
3 years (Germany: 2.6 years)
Positions per freelancer
14
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Banking and Finance, Insurance
Certification focus areas
Information Technology, Product Development, Marketing
Bachelor's degree or higher
100% (Germany: 98%)
Master's degree or higher
100% (Germany: 68%)
Doctorate
20% (Germany: 9%)
Certifications per freelancer
2
Most common languages
German, English, French
Speak two or more languages
100% (Germany: 93%)
Based on our profile pool as of 29 Oct 2026.
Daily rate distribution
The chart shows how the daily rates of experts in this technology in Cologne are distributed, based on recent contracts on our platform. Each bar covers a rate range — its height shows the share of experts charging within that range.
Average rates of experts in Cologne using Enterprise JavaBeans
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 29 Oct 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
Enterprise JavaBeans experts industry focus
See which industries our matched freelancers work in most often — every figure is calculated live from the freelancers on FRATCH.
- Information Technology (100%)
- Banking and Finance (75%)
- Insurance (63%)
- Automotive (50%)
- Transportation (50%)
- Government and Administration (50%)
- Telecommunication (50%)
- Education (38%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
Enterprise business logic
Enterprise JavaBeans, commonly called EJB, is a server-side component model for building secure, transactional business logic in Java applications. It handles concerns such as transactions, authorization, lifecycle management and concurrency so teams can focus on domain rules. EJB is now part of Jakarta EE, while many established systems still use the Java EE name.
Core components
EJB specialists work with stateless and stateful session beans, singleton beans and message-driven beans. They define service boundaries, manage persistence through JPA and connect business operations to REST, SOAP or messaging interfaces. Container services provide dependable behavior across distributed enterprise applications.
Ecosystem and tooling
The surrounding stack often includes Jakarta EE APIs, JPA, JMS, CDI, JTA and Bean Validation. Specialists may work with application servers such as WildFly, Payara, Open Liberty, GlassFish, WebLogic or WebSphere, alongside Maven, Gradle, Git and automated deployment pipelines. They also understand Java, SQL, relational databases and observability tools.
Where EJB fits
Companies use EJB in systems where consistency, security and controlled transactions matter:
- Banking, insurance and payment processing services
- Supply chain, logistics and order management platforms
- Government, healthcare and other regulated applications
- Internal enterprise services with complex business rules
EJB can support modular monoliths and service-oriented systems. It is especially valuable when an existing Java EE estate must remain stable while selected services are modernized.
When to hire specialists
Bring in freelance EJB expertise when a legacy application is difficult to change, an application server needs migration or transaction failures affect production. Specialists can assess bean boundaries, replace fragile remote calls, improve persistence behavior and plan a controlled move from Java EE to Jakarta EE. In Cologne, they can collaborate on-site, remotely or in a hybrid setup with local product and operations teams.
What strong professionals deliver
Strong EJB professionals connect framework knowledge with sound system design. They explain transaction propagation, security roles, bean scopes, pooling and failure handling in terms the team can use. Look for practical evidence in application-server upgrades, integration testing, performance diagnosis, documentation and clean handover. Effective collaboration also includes clear German or English communication, depending on the project team.
Frequently asked questions
Not sure where to start with Enterprise JavaBeans? These answers cover the essentials.
Enterprise JavaBeans is used to implement server-side business services that need transactions, security, concurrency control and reliable integration. EJB commonly supports banking, insurance, logistics, public-sector and other enterprise applications with complex business rules.
Enterprise JavaBeans offers standardized container services such as declarative transactions, security and messaging within the Jakarta EE ecosystem. Spring and CDI can provide similar capabilities, but the best choice depends on the existing application server, team skills, deployment model and modernization goals.
A strong EJB specialist usually also works with Java, Jakarta EE, JPA, JTA, JMS, CDI, SQL and relational databases. Experience with WildFly, Payara, WebLogic, WebSphere or Open Liberty is useful when the application depends on a specific server.
The right level depends on the system’s risk and scope rather than a fixed number of years. A migration, transaction defect or application-server upgrade calls for someone who has handled comparable production systems, while contained maintenance work may suit a professional with narrower EJB experience.
Enterprise JavaBeans work is often suitable for remote collaboration because source code, environments and deployment pipelines can be shared securely. On-site workshops in Cologne may still help with legacy-system discovery, stakeholder alignment or access to restricted infrastructure, and the team should agree on German or English communication needs.
Hiring an EJB professional is worthwhile when internal teams face unfamiliar application-server behavior, risky transaction changes or a Java EE to Jakarta EE migration. A specialist can shorten diagnosis, reduce avoidable changes and leave behind tests and documentation that the permanent team can maintain.
Ask how the professional would investigate transaction boundaries, bean lifecycle, pooling, remote calls and persistence failures in your environment. Request examples of testing and migration work, then use a focused technical discussion to assess reasoning, communication and the ability to make safe changes to an existing codebase.
Enterprise JavaBeans remains relevant when a company needs Jakarta EE standards, managed transactions and a mature application-server runtime. For greenfield systems, teams may also consider CDI, Spring or smaller services, but existing platform requirements and operational constraints should guide the decision rather than technology fashion.
The average hourly rate of freelancers in Cologne, Germany who have used Enterprise JavaBeans in their recent projects is 87 €, which corresponds to a daily rate of about 698 € based on an 8-hour working day.
Of the freelancers in Cologne, Germany who have used Enterprise JavaBeans in their recent projects, 100% hold at least a Bachelor's degree, 100% hold at least a Master's degree, and 20% hold a doctorate.
On average, freelancers in Cologne, Germany who have used Enterprise JavaBeans in their recent projects have 26 years of professional experience, with a single engagement typically lasting around 3 years.
The most common languages among freelancers in Cologne, Germany who have used Enterprise JavaBeans in their recent projects are German (100%), English (100%), and French (38%).
The most common industries among freelancers in Cologne, Germany who have used Enterprise JavaBeans in their recent projects are Information Technology (100%), Banking and Finance (75%), and Insurance (63%).
The most common business areas among freelancers in Cologne, Germany who have used Enterprise JavaBeans in their recent projects are Information Technology (100%), Product Development (88%), and Quality Assurance (75%).
Main locations of FRATCH Experts, who have recently used Enterprise JavaBeans
Our freelancers and interim experts are at home across the DACH region — available on-site in the major business hubs or fully remote. Choose a location to discover matched specialists, local market insights and up-to-date availability.
Berlin Hamburg Munich 
Cologne Frankfurt Stuttgart Dusseldorf Leipzig Dortmund Essen Bremen Dresden Hanover Nuremberg 
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FRATCH CEO
