EclipseLink Experts in Germany
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Meet FRATCH Experts in Germany, who have recently used EclipseLink
Ornel Franck W.
Last position:
Sales Partner at ERGO PRO
- Industry: Insurance, Trade, IT
- Customers & Projects: Consulting and selling insurance and similar services
- Main tasks: Insurance consulting (health insurance, retirement planning, wealth building); commercial services, inside and field sales; sales data analysis and forecasting; customer consulting and support; opening a new sales headquarters for private and business customers; business development & innovation management; business use case development; process optimization; stakeholder management; team leadership and training; preparation and delivery of trainings;
- Technologies used: Microsoft Office 365, Microsoft Teams, Jira, Draw.IO, Camunda 8, Java (8, 17,21,25), Git, Spring Boot, Spring Batch, Spring Data REST, Spring Web, Spring Security, J-Unit, Playwright, Lombock, Vaadin, H2, PostgreSQL (16, 17 18), pgAdmin, Docker, LLMs, JasperSoft Studio, JasperReports
Sercan T.
Last position:
Co-Founder & Lead Software Architect at Pflege-Pfad
- Focus: System architecture, cloud-native platforms, microservices, API design
- Product: Pflege-Pfad is a digital placement platform that directly connects relatives of people in need of care with verified care services and caregivers – without an agency and without ongoing fees.
- Business analysis & process design:
- Analysis of the German care market and identification of the key pain points of both target groups.
- Modeling of core business processes: registration, verification, care request, application, placement, and rating.
- Definition of the business model as a freemium/premium model with optional contact unlocking.
- Creation of user stories and requirements documentation for relatives, care services, and administrators.
- Design of trust and quality assurance mechanisms with document upload, admin review process, and rating system.
- Coordination with stakeholders and validation of product decisions with potential users.
- Technical implementation:
- Design and implementation of the entire platform architecture as the sole developer.
- Design and implementation of a REST API with Spring Boot and Kotlin, including JWT-based authentication.
- Development of the frontend as a single-page application with Angular 17.
- Implementation of the AWS infrastructure with EC2, RDS PostgreSQL, S3, CloudFront, and IAM.
- Document upload with AWS S3 using presigned URLs to verify care services.
- Email notifications via Resend API.
- AI-supported care service search via OpenAI API.
- Implementation of complete user flows such as registration, login, password reset, and the placement process.
- Development of an admin panel for user and care service management as well as analytics.
- CI/CD with GitHub Actions and containerized deployments with Docker.
- End-to-end tests with Playwright.
Technologies: Kotlin, Spring Boot 3, Spring Security, JWT, JPA/Hibernate, PostgreSQL, Angular 17, TypeScript, RxJS, AWS (EC2, ECS, S3, CloudFront CDN, RDS PostgreSQL, IAM), nginx, GitHub Actions, Playwright, Maven, Git, OpenAI API, Resend API, Docker, Scrum, i18n (DE/EN/TR), Kiro, feature flag architecture.
Marcus B.
Last position:
Java and Quarkus Expert at Large German energy service provider
- Modernization of a large-scale Java enterprise application*
The project is modernizing a complex enterprise application that has grown over many years. The existing Spring-based legacy system runs on Java 8, OSGi, and Eclipse RCP and is being gradually migrated to a modern, maintainable architecture with Java 25 and Quarkus.
Marcus works on analysis, architecture, refactoring, and implementation. One focus is on untangling historically grown structures and dependencies and on building a clean, sustainable Java and Quarkus technology stack.
Tools & technologies: Java 8, Java 25, Quarkus, Hibernate ORM with Panache, EclipseLink, OSGi, Eclipse RCP, Maven, JUnit, Mockito, REST, JSON, Git, Eclipse IDE, IntelliJ IDEA Ultimate, Jira, Confluence
Jorge P.
Last position:
Software Engineer – AWS and Kubernetes Specialist at Citti
- Creation, maintenance and hardening of Kubernetes clusters employing Ansible and ArgoCD
- Keywords: Ansible, AWX, Kubernetes, NetApp, Prometheus, CI/CD ArgoCD, SSO, Fluent-bit, HAProxy, Calico, Keycloak, oauth2-proxy, SealedSecrets, kubeseal, Aqua kube-bench, CIS-Benchmarks, Aqua Trivy operator
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
Ola V.
Last position:
IT Lecturer
- IT training in theory and practice for IT specialists in application development and system integration
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
Dimitry K.
Last position:
Rollout Expert at Everience Germany GmbH
- Project: Mazars Windows 11 rollout: responsible for the Windows 11 rollout at customer Mazars
- Understand customer-specific requirements (hardware compatibility, application dependencies, Microsoft AD group policies)
- Implement hardware logistics at customer sites
- Involve the IT, business, security, and compliance teams
- Update the infrastructure
- Carry out driver and firmware updates
- Automate the rollout with scripts
- Notify users, provide FAQs, change logs, and support contacts
- Technologies: Baramundi Management Center, AD, Azure AD, Intune, Office 365, OpenProject, RDP, Topdesk, MS Teams, PowerShell
György K.
Last position:
Senior Fullstack Developer at Rockstardevelopers GmbH
- Development of a test system
- Establishment of the architecture using Scala/Java for the backend and Swing for the frontend
- Setup of CI/CD pipelines with Jenkins for continuous integration, including automated builds
- Participation in the Scrum team, including daily stand-ups, sprint planning, and retrospectives
- Technology environment: Scala, Swing, EJB, JPA, Scrum, PostgreSQL, Mercurial
Ioan D.
Last position:
Senior Software Developer at ING
- Tribe Home, Product Area 4 - Customer in Life, Squad Cybertron.
- Analysis, design, development, and testing of new requirements for Optimmo, construction financing software.
- Analysis, design, development, and testing of the JEE application MWS kredit-baufi.
- Analysis, design, development, and testing of the Wicket Optimmo application.
- Analysis, design, development, and testing of kredit-baufi batch programs.
- Migration of kredit-baufi batches to RHEL9.
- CiL SCS Consumer Pacts with Finagle.
- CiL ScS Touch Point Architecture Integration.
- Team size: 10.
- Tools / Frameworks: OpenJDK Java 17, Kotlin 1.6.0, Azure, Jenkins, Stash, JEE, Gitlab, JIRA, Confluence, git, Spring 6.0, Sping Cloud, Spring Data, Hibernate, JPA, JMS, Kafka, Oracle, PL/SQL, Red Hat Enterprise Linux (RHEL), Maven, REST, JBoss, Intellij IDEA, Wicket 9 and 10, Istio.
Stephan H.
Last position:
Software development, software quality assurance, tester, test automation engineer at IT services
Refactoring the CRM system of an IT service provider This includes a complete refactoring of the legacy application, in particular the migration from JDK 1.6 to JDK 25 and the replacement of self-developed infrastructure components, such as the Object-Relational Mapper (ORM) and the frontend template engine, with current standard components based on Spring Boot. At the same time, the previous close coupling between the back end and front end is being removed and the application is being migrated to a modern microservice architecture. The microservices are implemented as independent, reusable units and operated in autonomous Docker containers. The backend components are provided through REST APIs. As part of the project, CI/CD and deployment processes for the container-based microservice architecture were also established and automated using GitLab CI. At the same time, quality assurance is ensured through the implementation and automation of unit, integration and system tests. The work is supported by AI, particularly through the use of GitHub Copilot and LM Studio (gpt-oss) for code development and prompt engineering. Position: Software development, software quality assurance, tester, test automation engineer
Work performed:
- Analysis of the functional and technical use cases (workflows, involved processes/systems, communication paths, security requirements)
- Code refactoring (code cleanup, optimization)
- Dependency refactoring
- Refactoring of REST services (SpringBoot)
- Refactoring of the ORM layer
- Test execution / test automation (Serenity, Selenium, Playwright, JUnit)
- Establishment and automation of CI/CD pipelines for build, test and deployment steps in a Docker/microservice environment Team size: 2 people IT basis: Technologies: Java (JDK 25), Spring Boot, Hibernate, JPA, SQLServer, MariaDB, Docker, Yaml, Markdown, JSON, HTML/CSS, REST Tools: IntelliJ, DBeaver, Git/GitLab, GitHubCopilot (AI) Work management: Gitlab Tests: Serenity, Selenium, Playwright, JUnit Platform: Linux, Windows Version control: Gitlab Build management: Gitlab CI
Faruk S.
Last position:
Software Developer at HR Solutions GmbH
- Designing and developing a web application for the public sector
- Setting up and executing software tests, mainly unit tests
- Technical design and implementation of requirements
- Uploading and displaying CSV files
- Communicating with business units regarding development and test support
- Technologies used: Java, Spring Boot, Spring Security, Spring Batch, Spring Cloud, Spring Data JPA and Hibernate, RESTful, JSON, React, Oracle, JUnit, Mockito, CI/CD, GitLab, Docker, Keycloak, Liquibase, BIRT, Swagger, Microservices
Michael K.
Last position:
Atruvia AG
- Further development of framework components and services in the Enterprise Banking Control Platform (EGP Framework), a set of cross-cutting libraries and services for all bounded context scopes of the platform.
- Migration from Java 17 to Java 21 and from Spring Boot 3.2 to 3.4 in about 80 library and service repositories (updating Maven POMs, Dockerfiles, Jenkins pipelines, source code migration, test updates).
- Writing unit and integration tests with JUnit and JGiven.
- Performing and analyzing performance measurements with Dynatrace.
- Enhancing multi-stage CI/CD pipelines (unit tests, security analyses, Docker builds, Harbor deployments, ...).
- Tech stack used: Java (90%), Python (10%), Spring Boot, JPA/Hibernate, JGiven, OpenAPI, Camunda 7, Podman, OpenShift/Kubernetes, Oracle DB, SonarQube, Dynatrace, Jenkins, Harbor, Bitbucket, Jira, Confluence.
Thomas R.
Last position:
Architect, Developer at Oberlandesgericht Stuttgart – IuK FZ Justiz
Backend development including architecture
Creating a documentation platform
Training employees in Java/Git/Container
Exploring new technologies
Tools: IntelliJ
Tools: Git
Languages and technologies: Java 21
Languages and technologies: Spring Boot 3.4
Languages and technologies: Oracle DB
Languages and technologies: Websockets/REST
Languages and technologies: JSON
Languages and technologies: Liquibase
Languages and technologies: Keycloak
Languages and technologies: OAuth2
Languages and technologies: Docker/Podman
Languages and technologies: OpenShift
Languages and technologies: Micrometer/OpenTelemetry
Languages and technologies: Grafana Loki
Languages and technologies: Grafana Mimir
Languages and technologies: Grafana Tempo
Languages and technologies: Grafana dashboards
Languages and technologies: Vue.js 3
Radovan R.
Last position:
Development and Technical Architecture at HDI
Web application for contract changes
Micro frontend development from scratch through production with a Reactive Forms basis, Responsive Web Design, validation, multilingual support, accessibility, unit tests and component tests
Technologies: Angular 19-20, Nx, Angular CLI, Native Federation, TypeScript, HTML, SASS, Tailwind CSS, Angular Material, Reactive Forms, RxJS, Signals, PDF-Make, ng-openapi-gen, i18n, JSON Server, REST, JWT, Jest, Playwright, IntelliJ, Git, CI/CD with GitLab, Cloud Foundry, Nginx; Scrum
Discover over 15,000 top freelancers
Statistics of experts using EclipseLink
Aggregated from the professional profiles of matched freelancers.
Experience
22 years
Position duration
2.1 years
Positions per freelancer
18
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Banking and Finance, Automotive
Certification focus areas
Information Technology, Product Development, Project Management
Bachelor's degree or higher
93%
Master's degree or higher
67%
Doctorate
13%
Certifications per freelancer
3
Most common languages
German, English, French
Speak two or more languages
95%
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 Germany 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 Germany using EclipseLink
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.
EclipseLink 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 (77%)
- Automotive (59%)
- Government and Administration (55%)
- Insurance (50%)
- Transportation (50%)
- Education (36%)
- Retail (36%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
EclipseLink at a glance
EclipseLink is the open-source persistence framework behind Eclipse Persistence Services and a leading implementation of Jakarta Persistence, formerly known as JPA. It maps Java objects to relational data while handling identity, transactions, caching and query execution. Teams use it when they need standards-based persistence with detailed control over runtime behavior.
Applications and systems
EclipseLink appears in enterprise Java systems where data consistency and long-lived domain models matter. Typical work includes:
- Mapping complex object models to relational schemas
- Building persistence layers for Jakarta EE applications
- Connecting services to Oracle, PostgreSQL and other databases
- Supporting REST, SOAP and transactional business processes
- Handling large domain models with caching and batch operations
It is common in financial services, manufacturing, logistics, public-sector systems and other environments with established Java platforms.
Ecosystem and tooling
Strong EclipseLink specialists work across Jakarta Persistence annotations, EntityManager usage, JPQL, native queries and persistence units. They understand Jakarta EE runtimes such as Payara, GlassFish and WebLogic, as well as application frameworks that use JPA underneath. Useful adjacent skills include Maven or Gradle, SQL, database migration tools, JDBC, CDI, REST services and automated testing.
When expertise matters
Companies often bring in freelance professionals when a persistence layer is slow, difficult to evolve or being moved between application servers. Specialist support is valuable for replacing older TopLink configurations, upgrading from Java EE to Jakarta EE, resolving transaction errors or aligning mappings with an existing database. In Germany, this work often supports regulated or process-heavy systems that require careful documentation and dependable remote collaboration.
What quality looks like
A capable EclipseLink professional starts with the domain model, database design and transaction boundaries rather than changing settings blindly. They can explain lazy loading, fetch groups, cache coordination, optimistic locking and inheritance mappings in practical terms. They also test generated SQL, measure query behavior and document decisions so the persistence layer remains maintainable after handover.
Choosing the right specialist
Look for evidence of production work with EclipseLink or its Eclipse Persistence Services distribution, not only general JPA knowledge. Ask how the specialist diagnosed slow queries, handled schema constraints and managed provider-specific behavior without weakening portability. For distributed teams, agree on repository access, test data, review routines and communication in German or English before implementation begins.
Frequently asked questions
Everything clients usually want to know about EclipseLink, in one place.
EclipseLink is used to persist Java and Jakarta applications’ object models in relational databases. It provides mapping, querying, transactions, caching and coordination features without requiring every database operation to be written manually.
EclipseLink and Hibernate both implement Jakarta Persistence and support common ORM patterns. EclipseLink is often selected for strong Jakarta EE alignment, advanced caching and provider features, while Hibernate may be preferred when a team already relies on its wider ecosystem or framework integrations.
A strong EclipseLink specialist should understand SQL, database indexing, JDBC, Maven or Gradle and application-server configuration. Experience with Jakarta EE, REST services, CDI, automated testing and migration tools helps them solve issues beyond entity mappings.
The required background depends on the assignment. A simple mapping change may need focused JPA knowledge, while cache coordination, transaction failures or a TopLink migration call for production experience with EclipseLink, the database and the surrounding runtime.
Yes, many EclipseLink tasks can be completed remotely when the specialist receives secure repository access, test data and clear runtime documentation. On-site sessions can still help with legacy systems, restricted environments or workshops involving several teams in Germany.
EclipseLink remains a significant Jakarta Persistence implementation and is closely associated with the Eclipse Foundation ecosystem. It is relevant when teams need standards-based persistence, Jakarta EE compatibility or provider features that are not exposed through portable APIs alone.
Typical EclipseLink issues include unintended eager loading, inefficient JPQL, missing database indexes, excessive cache activity and poorly defined transaction boundaries. A specialist should inspect generated SQL, entity relationships, cache settings and database execution plans before proposing a fix.
Ask the professional to describe a real mapping or performance problem and the evidence used to resolve it. Good answers cover entity lifecycle, transaction behavior, lazy loading, cache coordination, testing and the trade-off between EclipseLink-specific features and portable JPA code.
The average hourly rate of freelancers in Germany who have used EclipseLink in their recent projects is 90 €, which corresponds to a daily rate of about 719 € based on an 8-hour working day.
Of the freelancers in Germany who have used EclipseLink in their recent projects, 93% hold at least a Bachelor's degree, 67% hold at least a Master's degree, and 13% hold a doctorate.
On average, freelancers in Germany who have used EclipseLink in their recent projects have 22 years of professional experience, with a single engagement typically lasting around 2.1 years.
The most common languages among freelancers in Germany who have used EclipseLink in their recent projects are German (100%), English (95%), and French (23%).
The most common industries among freelancers in Germany who have used EclipseLink in their recent projects are Information Technology (100%), Banking and Finance (77%), and Automotive (59%).
The most common business areas among freelancers in Germany who have used EclipseLink in their recent projects are Information Technology (100%), Product Development (95%), and Quality Assurance (82%).
Main locations of FRATCH Experts, who have recently used EclipseLink
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 Request a free demo
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FRATCH CEO
