Jakarta Persistence (JPA) Experts in Hamburg
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Meet FRATCH Experts in Hamburg, who have recently used Jakarta Persistence (JPA)
Niko Schmuck
Last position:
Developing Architect, Technical Lead "gridlytics" at HH Energienetze
- Building a data integration platform for high, medium, and low voltage assets for contextual analysis of time series with master data from the SCADA control system (IEC 60870 104), INIS, and SAP.
- Responsibility for the architecture and implementation of the solution, as well as sparring partner for the Product Owner.
- Use of Kotlin, Spring Boot, Maven, TimescaleDB, PostgreSQL, liquibase, Elements IoT, Docker, Kubernetes, Grafana, Python, jupyter, and various API gateways.
Daniel Sedlack
Last position:
Senior Software Engineer at energielenker solutions GmbH
- Designed and implemented a Python-based ETL pipeline with the Dagster framework to transform raw energy data from heterogeneous sources using InfluxDB and visualizations in Grafana
- Defined time-based and dependency-based jobs
- Deployed to managed Kubernetes clusters using Helm
- Integrated InfluxDB Cloud
- Prepared data for use in Grafana, including cleaning, normalization, and time-based resampling in Python
- Developed dashboards and visualizations in Grafana
- Developed unit tests with mocking using pytest
- Set up a CI/CD pipeline in GitLab
Technologies: Python, Dagster, InfluxDB, Grafana, pandas, pytest, REST, CI/CD, GitLab, Container, Kubernetes, Helm, Docker, Cloud
Rainer Diekmann
Last position:
Enterprise Architecture Management / Backend Software Developer at Polizei Hamburg
- Several projects in a police context
- Model and document police procedures/projects with Archimate (as-is/to-be) in the context of P20 (BKA)
- Create software architectures with microservices
- POC development with Springboot/Docker/Kubernetes
- Project size: 10 people
- Enterprise architecture management with Togaf and Archimate
- Backend software development Springboot
- DevOps with Kubernetes
- Implemented using: Java 17/21, Springboot 3, P20 architecture, Togaf, Archimate
Paul Köhler
Last position:
Senior Flutter Developer at Elea.health
- Further development of a complex laboratory information system
- Development of new features including design
- Close collaboration with company leadership
- Embedded in a top team with consistently high performance under time pressure
- Agile approach, Kanban
Oliver Langer
Last position:
Developer, Architect at libri GmbH
- Role: Developer, Architect
- Technologies: java, typescript, golang, spring (boot, web, security, data), Angular, AWS (OpenSearch, Aurora, SNS/SQS, CloudWatch, EC2, IAM), Kubernetes, Terraform, Helm, OAuth, Keycloak, CI/CD, gradlew, Liquibase, Test Driven Development, shell scripting
Raphael Vullriede
Last position:
Tech- / Team Lead / Architect / Engineer at Freelance IT Consultant
- Independent Software Engineer focusing mainly on complex backend architectures.
Rolf Gardewischke
Last position:
Developer & Designer at Security authorities
- Migration of a case processing system with numerous interfaces to other systems from Spring and Activiti to a Java JEE application
- Further development into a cloud application
- Consulting, development, requirements analysis, specification and design
- Coordination with upstream and downstream systems
- Data modeling, programming and implementation
- Support with code reviews and ensuring clean code in the PL/SQL context
- Documentation in Confluence
- Troubleshooting PL/SQL applications including log analysis, session tracing and performance profiling
- Optimization and tuning measures in the PL/SQL environment
- Knowledge transfer and onboarding of new employees
- Use of Jira for task management, progress tracking and sprint planning
Ashkaben Padhya
Last position:
Technical Lead Java at Accenture Baltics
- Oversee the development process and review code to ensure quality and adherence to technical standards using Java 17, Spring Boot, Graph API, Spring Core, Spring MVC, Spring AOP, Spring Security, JPA, PostgreSQL, REST
- Engage with clients to understand technical requirements and translate them into actionable tasks for the development team
- Troubleshoot and resolve pre-production and production bugs, conducting analysis, diagnosing issues, and implementing solutions to maintain optimal system performance
- Guide and mentor the Agile development team, providing technical expertise, promoting best practices and coding standards, and fostering a collaborative environment where team members can thrive
- Contribute to overall project planning and customer relationship management to deliver high-quality software solutions
Jürgen Brardt
Last position:
Software Developer at Inform AG
- Coaching junior developers
- Further development and custom extensions of a standard software (microservices (DDD) and partial monolith)
- Interface extensions
- Web services
- Test automation
- Design
- Used technologies: Java8, Java17, TypeScript, Python, PostgreSQL, Spring (Integration, Data, Boot), JPA, AWS (Cloud, Lambda, EC2, SQS/SNS), Microservices, Fitnesse/Cucumber, Gitlab
Discover over 15,000 top freelancers
Statistics of experts using Jakarta Persistence (JPA)
Aggregated from the professional profiles of matched freelancers.
Experience
26 years (Germany: 20 years)
Position duration
1.8 years (Germany: 2.1 years)
Positions per freelancer
17 (Germany: 14)
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Retail, Healthcare
Certification focus areas
Information Technology, Product Development, Project Management
Bachelor's degree or higher
88% (Germany: 95%)
Master's degree or higher
38% (Germany: 53%)
Doctorate
13% (Germany: 11%)
Certifications per freelancer
1 (Germany: 3)
Most common languages
German, English, French
Speak two or more languages
100% (Germany: 95%)
Based on our profile pool as of 30 Aug 2026.
Daily rate distribution
The chart shows how the daily rates of freelancers in this technology in Hamburg 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 Hamburg using Jakarta Persistence (JPA)
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 30 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
About the technology
JPA in practice
Jakarta Persistence, still widely called JPA or Java Persistence API, defines how Java applications store and read data through entities, mappings, and queries. It is used in business systems where object models must stay consistent with relational databases.
What experts deliver
- Entity and relationship mapping for clean domain models
- JPQL, Criteria API, and native query work
- Transaction handling and persistence context behavior
- Repository patterns in Spring and Jakarta EE stacks
- Schema alignment with existing database structures
When to bring in help
Companies usually look for freelance specialists when a project has complex joins, legacy mappings, slow queries, or a refactor from older persistence code. That is common in Hamburg teams working on logistics, shipping, insurance, finance, and enterprise back-office systems.
Ecosystem around it
JPA rarely stands alone. Strong professionals also work with Hibernate, EclipseLink, Spring Data JPA, Flyway or Liquibase, and testing tools that verify database behavior. They know when to use annotations, when to keep mappings simple, and when to step back from the ORM layer.
What good specialists do
A strong JPA expert writes code that is readable, predictable, and safe under load. They spot lazy loading issues, N+1 query problems, cascade mistakes, and transaction boundaries that can break in production.
Collaboration fit
Hamburg projects often combine remote work with a few on-site sessions for architecture reviews or data model workshops. Good specialists can work in English, and often in German too, which helps when they need to align with product owners, database teams, or legacy application owners.
Frequently asked questions
Questions about Jakarta Persistence (JPA)? Start with the answers below.
Jakarta Persistence (JPA) is used to map Java objects to relational database tables and to manage data access in enterprise applications. It helps teams keep domain logic and persistence logic organized instead of scattering SQL across the codebase.
JPA is a specification, while Hibernate is a common implementation and toolkit around it. If you hire for JPA work, you often want someone who understands Hibernate too, because many systems use it as the actual persistence engine.
Java Persistence API expertise matters when mappings are complex, queries are slow, or the codebase has grown hard to maintain. It is also useful during migrations from older persistence code or when a team needs cleaner transaction handling and repository design.
A strong Jakarta Persistence specialist should also understand SQL, database indexing, transaction boundaries, and the surrounding Java stack. Spring Data JPA, Hibernate, Flyway or Liquibase, and testing against a real database are common adjacent skills.
JPA gives you object-relational mapping, unit-of-work behavior, and a higher-level way to manage data access. Direct SQL or JDBC can be better for very specific performance cases, but JPA is often the better fit when the application needs maintainable domain models and consistent repository patterns.
Yes. JPA work is often done remotely because most tasks center on code, mapping reviews, and query analysis, though some Hamburg teams still prefer on-site workshops for data models or system handover. Clear communication matters more than location.
Look for clear entity design, careful handling of lazy loading, and a disciplined approach to transactions and query count. A good JPA professional explains trade-offs, can read execution plans, and avoids hidden ORM side effects.
Searchers often use JPA, Jakarta Persistence, or the older name Java Persistence API. A strong profile should be relevant to the current Jakarta namespace, while still understanding older Java EE code if your system has not been migrated yet.
The average hourly rate of freelancers in Hamburg, Germany who have used Jakarta Persistence (JPA) in their recent projects is 100 €, which corresponds to a daily rate of about 799 € based on an 8-hour working day.
Of the freelancers in Hamburg, Germany who have used Jakarta Persistence (JPA) in their recent projects, 88% hold at least a Bachelor's degree, 38% hold at least a Master's degree, and 13% hold a doctorate.
On average, freelancers in Hamburg, Germany who have used Jakarta Persistence (JPA) in their recent projects have 26 years of professional experience, with a single engagement typically lasting around 1.8 years.
The most common languages among freelancers in Hamburg, Germany who have used Jakarta Persistence (JPA) in their recent projects are German (100%), English (100%), and French (11%).
The most common industries among freelancers in Hamburg, Germany who have used Jakarta Persistence (JPA) in their recent projects are Information Technology (100%), Retail (67%), and Healthcare (56%).
The most common business areas among freelancers in Hamburg, Germany who have used Jakarta Persistence (JPA) in their recent projects are Information Technology (100%), Product Development (100%), and Quality Assurance (89%).
Main locations of FRATCH Experts, who have recently used Jakarta Persistence (JPA)
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 
Berlin 
Munich 
Cologne 
Frankfurt 
Dusseldorf Request a free demo
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FRATCH CEO
