EclipseLink Experts in Germany
for reliable persistence solutions, matched with vetted and available freelancers in minutesHire experts who design JPA persistence layers, integrate EclipseLink with Jakarta EE applications and tune entity mappings, caching and transactions. FRATCH matches you quickly and precisely with vetted, available freelancers who fit your technical needs.
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
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
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 matchmaking platform that connects relatives of people in need of care directly 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 the 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 a solo 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 via presigned URLs for verification of 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 placement process.
- Building 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.
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
Ola V.
Last position:
IT Lecturer
- IT training in theory and practice for IT specialists in application development and system integration
Stephan H.
Last position:
Development, Tester at Telecommunications
Set up an operational contract information system. This is mainly used as an order management system - for migrating existing contracts as well as for creating and providing new contract bundles.
Sales agents can use it to order new services, modify existing ones and migrate service types, as well as provide price information to the customer.
This supports the marketing of new services as well as the replacement of old services for existing customers.
In addition, existing data is imported, processed (ETL) and provided via services for further use in the portal front end.
Analysis of the business and technical use cases (workflows, involved processes/systems, communication paths, security requirements)
Further development / creation of the front-end components (React/JavaScript)
Design and implementation of the business logic
Creation of the functional and technical component documentation
Test execution / test automation (Cypress, test coverage)
Team size: 8 people
Technologies: React, JavaScript, Rest (JSon), Yaml, Markdown, MariaDB (SQL), Docker, Swagger, Cypress
Tools: Webstorm, ReactDeveloperTools, VisualStudioCode, Word, DBeaver, Git/GitLab
Work management: GitLab
Platform: Linux
Build management: GitLab
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
As-is analysis
Evaluation of Redgate Flyway functionality
Concept creation
Products: Redgate Flyway, GitHub, Quest, Erwin Data Modeller, Oracle, Atlassian Jira, Atlassian Confluence
Skills: 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
Ingo D.
Last position:
Analytics at BaFin - Federal Financial Supervisory Authority Frankfurt
- Introduction of methods for developing and automated deployment of cloud-native software and machine learning applications in OpenShift clusters
- Development of various programs in Python
- Technologies: Kubernetes, OpenShift, Kustomize, ArgoCD, Tekton, Docker, PodMan, Airflow, IntelliJ, PyCharm, Git, Bitbucket, Jira, Confluence, Python
Igor K.
Last position:
Freelance Software Developer
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
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.
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 19 Sep 2026.
Daily rate distribution
The chart shows how the daily rates of freelancers in this technology in Germany are distributed, based on recent contracts on our platform. Each bar covers a rate range — its height shows how many freelancers charge 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 19 Sep 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
What EclipseLink does
EclipseLink is an open-source persistence framework from the Eclipse Foundation and a leading implementation of Jakarta Persistence, formerly known as JPA. It maps Java objects to relational databases and supports applications that need clear domain models without embedding SQL throughout the codebase. Teams use it in Jakarta EE services, enterprise applications and long-running transactional systems.
Persistence capabilities
EclipseLink handles entity mapping, relationships, inheritance, lazy loading and transaction boundaries. Its capabilities also include advanced querying through JPQL and EclipseLink Expressions, optimistic and pessimistic locking, fetch groups and database-specific customization. Strong specialists know how these features affect correctness, throughput and maintainability.
Ecosystem and tooling
EclipseLink fits into the Jakarta EE ecosystem and commonly works with application servers, CDI, JTA, Bean Validation and JDBC drivers. It can be configured through persistence.xml, annotations or programmatic APIs, with Maven and Gradle supporting repeatable builds. Experts may also work with REST services, messaging, schema migration tools and relational databases such as PostgreSQL, Oracle Database or MariaDB.
Typical project work
- Design entity models and persistence units for new Jakarta EE services
- Migrate applications from older JPA providers or legacy TopLink Essentials setups
- Diagnose slow queries, unexpected joins, cache issues and transaction failures
- Align EclipseLink mappings with existing database schemas
EclipseLink is often selected when a project needs standards-based persistence with provider-specific control. It can support modular backends, integration services and business systems where data consistency matters.
When companies need specialists
Companies bring in freelance expertise when a persistence layer is slowing releases, producing inefficient SQL or exposing subtle data consistency problems. A specialist can review mappings, trace generated queries, stabilize transactions and establish tests before a migration or platform change. This is useful for German teams working with distributed delivery groups, especially when documentation and collaboration must work in both English and German.
What strong experts deliver
Strong EclipseLink professionals understand both the object model and the database beneath it. They distinguish provider behavior from Jakarta Persistence standards, choose caching deliberately and explain trade-offs in terms of workload and operational risk. Look for clear mapping conventions, integration tests, measured query improvements and documentation that helps the internal team maintain the solution after handover.
Frequently asked questions
Everything clients usually want to know about EclipseLink, in one place.
EclipseLink is used to persist Java and Jakarta applications through object-relational mapping. It supports entity relationships, JPQL queries, transactions, caching and integration with relational databases in enterprise systems.
EclipseLink and Hibernate both implement Jakarta Persistence and provide object-relational mapping for Java applications. EclipseLink is often valued for its close connection to the Eclipse and Jakarta EE ecosystems, while Hibernate is frequently chosen for its broad community adoption and familiar tooling.
EclipseLink originated from the open-source release of Oracle TopLink technology and is sometimes discussed as its successor. TopLink Essentials is an older related name, but current projects should assess EclipseLink releases and Jakarta namespace compatibility directly.
A strong EclipseLink expert usually understands Jakarta Persistence, Jakarta EE, JTA, CDI, JDBC and relational database design. Useful adjacent skills include SQL analysis, Maven or Gradle, application-server configuration, automated testing and database migration practices.
The right EclipseLink specialist depends on the scope and risk of the work, not a fixed time threshold. A mapping review may need focused persistence expertise, while a migration or performance program calls for someone who can assess application code, database behavior, transactions and deployment configuration together.
EclipseLink projects can usually be handled remotely when the team provides repository access, database documentation, test data and clear deployment procedures. For German companies, agree early on working language, overlap for design discussions and access rules for systems that cannot be reached outside the office.
EclipseLink is a good fit when a Jakarta EE application needs standards-based persistence plus control over mappings, caching or provider behavior. It is less suitable when a team wants to avoid object-relational mapping entirely or when its runtime stack is built around a different persistence model.
Quality EclipseLink work is visible in explicit mappings, predictable transaction behavior, efficient generated SQL and tests that cover relationships and failure cases. Ask the expert to explain cache settings, query plans, migration assumptions and how the design will behave under the application's real workload.
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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Philipp Thomaschewski
FRATCH CEO
