Jakarta Persistence (JPA) Expert in Vienna
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Meet FRATCH Experts in Vienna, who have recently used Jakarta Persistence (JPA)
John A.
Last position:
Software Developer and DevOps Engineer at Bundesrechenzentrum (BRZ)
Refactoring and improving core APIs; implementing client change requests. Setting up metrics, traces, and logs monitoring infrastructure to support operations. Designing GitOps deployment and infrastructure as code. Applications and systems configuration in ArgoCD and Openshift. Confluence documentation of design, approach, and solution. Tech Stack: Java 8 & 21, Spring framework, JSP, JavaScript, Bash scripts, SQL, Grafana Stack, OpenTelemetry, Docker, DB2, Maven, Kubernetes Kompose.
Michail M.
Last position:
OpenShift Specialist, Developer at Insurance
Project goal: Introduce OpenShift as the run-time platform and migrate all applications to OpenShift.
My contribution: Make sure logging and monitoring for the applications were in place. Set up and put into operation the OpenShift components for logging and monitoring (Elasticsearch, Prometheus, and Grafana). Develop and implement the security concept for OpenShift. Work with developers to define and carry out the application changes needed for the OpenShift migration. Integrate monitoring into the applications.
Technical environment: Java, WebSphere Liberty, OpenShift components, Elasticsearch (ELK stack), Prometheus, Grafana.
Üsame T.
Last position:
Java Backend Developer at Porsche Informatik
- Java EE 8 development
- Java 21 and Spring Boot 3 microservices development
- Release management
- Onboarding of new team members
- Owner of an team-internal "Best Code Engineering Award"
Joseph W.
Last position:
Freelancer Cloud / Solution Architect (AWS) at A1 Bank
- I am responsible for providing solution architecture and technical assistance for a migration initiative aimed at transitioning to a new core banking system.
- The project involves replacing in-house development with a commercially available off-the-shelf core banking system operated as SaaS on AWS.
- Duties encompass solution design, technical coordination, supporting development teams, and providing IT support and troubleshooting.
- Managing over 10 global vendors and partners is crucial to project success.
- Technologies: VMWare ESXi, AWS, EKS Kubernetes, Mastercard Payment Transaction Service, Avaloq, A1 Telekom Austria infrastructure, CheckPoint FW, F5, Site-to-Site VPNs, PingID, Futurae SDK, Airlock, UC4/Automic, Firebase, iOS/Android lifecycle management, AWS IAM, AWS AppStream, AWS S3, AWS Transfer Family, QlikView, OpenAPI.
Attila D.
Last position:
Full-Stack Software Engineer at Research Data Evaluation
- Custom anonymized research data analyzer, providing insights and facilitating data-driven decision-making.
- Designed and developed back- and frontend.
- Delivered end-to-end solution.
- Accelerated research timeline by 2 months.
Javid A.
Last position:
B2B Contract - Senior Fullstack developer (Java + Angular)
- Project: E-Platform with 100k users
- Skills: Java, Spring, Spring Boot
- TechStack: Angular 18, Java 17, Spring Boot, Oracle DB, Spring Data, JPA, Hibernate, Oracle, Postgres, SQL
Aaron H.
Last position:
Career Break
- Big move, focus on DIY hobbies, small personal software projects.
Monji M.
Last position:
Senior Software Developer at AMA Wien
IT concept
Implementation
Estimation
Design
Installation
Oracle APEX applications for farmers in Austria to register their products and get subsidies.
Implement new applications or adapt existing applications according to customer requirements (CR)
Fix bugs
Update data in the database
Install applications
Technologies/methods used: Oracle DB, PL/SQL, DM, Oracle Apex, JavaScript, CSS, OpenLayers, GIT
Discover over 15,000 top freelancers
Statistics of experts using Jakarta Persistence (JPA)
Aggregated from the professional profiles of matched freelancers.
Experience
21 years
Position duration
2.8 years
Positions per freelancer
8
Top business areas
Information Technology, Product Development, Operations
Top industries
Information Technology, Insurance, Transportation
Certification focus areas
Information Technology, Business Intelligence, Product Development
Bachelor's degree or higher
71%
Master's degree or higher
43%
Certifications per freelancer
3
Most common languages
German, English, French
Speak two or more languages
100%
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 Vienna 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 Vienna 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 19 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
Jakarta Persistence (JPA) 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%)
- Insurance (75%)
- Transportation (63%)
- Government and Administration (63%)
- Telecommunication (50%)
- Professional Services (38%)
- Automotive (25%)
- Healthcare (25%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
What JPA does
Jakarta Persistence (JPA) is the standard Java specification for mapping objects to relational database records. It defines entities, relationships, persistence contexts and queries so application code can work with business data without managing every SQL statement by hand. JPA is commonly used through providers such as Hibernate.
Core building blocks
A strong implementation uses entity annotations, identifier strategies, lifecycle rules and carefully designed associations. Experts work with EntityManager, JPQL, Criteria API and transaction boundaries, while aligning mappings with the database schema. They also handle lazy loading, cascading, locking and validation where the domain requires it.
Typical project work
- Model entities and relationships for new Java applications
- Migrate legacy Java Persistence API or Hibernate mappings
- Build repository and query layers with JPQL or Criteria API
- Diagnose slow queries, excessive joins and persistence errors
- Prepare database changes for Spring-based services
Ecosystem and delivery
JPA projects often sit alongside Jakarta EE, Spring Data JPA, Hibernate ORM, Maven or Gradle, and relational databases such as PostgreSQL, Oracle or MySQL. Professionals may also contribute to REST services, testing, migrations with Flyway or Liquibase, and containerised delivery. In Vienna, local teams may combine on-site workshops with remote implementation across distributed Java teams.
When specialists help
Companies bring in freelance expertise when an entity model has become difficult to change, production queries are slow, or a migration from older javax.persistence packages needs careful planning. Support is also useful during service decomposition, database redesigns, application modernisation or a release that exposes transaction and concurrency issues. Clear documentation and knowledge transfer reduce long-term dependency.
Quality signals
Look for professionals who can explain the SQL behind a JPA query and show how mapping choices affect performance and consistency. Strong specialists test transaction boundaries, inspect generated queries, manage fetch plans deliberately and distinguish provider-specific behaviour from portable JPA features. They communicate clearly with database, application and product teams, including in remote or on-site collaboration in Vienna.
Frequently asked questions
Curious about Jakarta Persistence (JPA)? Here are the answers that come up again and again.
Jakarta Persistence (JPA) is used to map Java objects to relational database tables and manage their lifecycle. It supports entity relationships, transactions and typed queries in business applications, often through Hibernate ORM or another persistence provider.
Jakarta Persistence (JPA) reduces repetitive data-access code by representing database records as entities and relationships. Direct SQL can offer tighter control for specialised queries, so experienced professionals often combine JPA with native queries when portability or abstraction would otherwise limit the solution.
Jakarta Persistence (JPA) work benefits from knowledge of Java, relational database design, SQL and transaction management. Spring Data JPA, Hibernate ORM, REST services, automated testing and migration tools such as Flyway or Liquibase are also common project requirements.
The right level depends on the risk and scope of the persistence layer rather than a fixed time period. A smaller feature may need a specialist who can implement mappings and queries, while a complex migration or performance problem calls for a professional who has handled transactions, locking, legacy schemas and provider-specific behaviour.
Jakarta Persistence (JPA) work is well suited to remote collaboration because mappings, queries and tests can be reviewed through shared repositories and technical documentation. Vienna-based companies may still prefer on-site workshops for domain modelling or architecture decisions, with German or English communication agreed at the start.
Hibernate ORM is a widely used implementation of Jakarta Persistence (JPA), providing the runtime that translates entity operations into database interaction. A specialist should know which behaviour comes from the JPA specification and which features are specific to Hibernate, especially around fetching, batching and caching.
Jakarta Persistence (JPA) quality is visible in clear entity boundaries, predictable transaction behaviour and queries that match the intended database access pattern. Ask a professional to explain generated SQL, fetch strategies, indexing assumptions, test coverage and how failures or concurrent updates are handled.
Jakarta Persistence (JPA) implementations need review when they produce unexpected extra queries, large object graphs, detached-entity errors or unclear cascade behaviour. Other warnings include using eager fetching by default, hiding database problems behind generic repositories, and relying on provider-specific features without documenting them.
The average hourly rate of freelancers in Vienna, Austria who have used Jakarta Persistence (JPA) in their recent projects is 90 €, which corresponds to a daily rate of about 720 € based on an 8-hour working day.
Of the freelancers in Vienna, Austria who have used Jakarta Persistence (JPA) in their recent projects, 71% hold at least a Bachelor's degree and 43% hold at least a Master's degree.
On average, freelancers in Vienna, Austria who have used Jakarta Persistence (JPA) in their recent projects have 21 years of professional experience, with a single engagement typically lasting around 2.8 years.
The most common languages among freelancers in Vienna, Austria who have used Jakarta Persistence (JPA) in their recent projects are German (100%), English (100%), and French (25%).
The most common industries among freelancers in Vienna, Austria who have used Jakarta Persistence (JPA) in their recent projects are Information Technology (100%), Insurance (75%), and Transportation (63%).
The most common business areas among freelancers in Vienna, Austria who have used Jakarta Persistence (JPA) in their recent projects are Information Technology (100%), Product Development (100%), and Operations (50%).
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.
Countries:
Vienna 
Graz Request a free demo
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