Jersey Experts in Germany
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Meet FRATCH Experts in Germany, who have recently used Jersey
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.
Kiriakos Krastillis
Last position:
Tech Lead / Architect : OTTO API Platform at OTTO
maturing their API Practices on both, a Business and Technology level. My role encompasses strategy, architecture, developer advocacy as well as hands on software engineering, enabling both technical teams and business leadership to adopt and act on API- centric principles effectively. Coincidentally, we also establish GitOps, DX and Platform Best practices with this project.
Highlights:
- Aligning executives with the initiative by clarifying strategy, replacing misconceptions and myths with facts, clarifying the value of existing assets and enabling informed decision-making
- Formulating a way forward for API Lifecycle Management at OTTO
- Driving platform progress and fostering developer engagement by hands-on engineering work towards strategic goals
API Lifecycle Management, Team Topologies, Organizational Evolution, Regulatory, Platform Advocate, Developer Platform, Communities of Practice, Terraform, Kotlin, Kafka, Kong, WSO2, Apigee, Gravitee, Backstage, AsyncAPI, OpenAPI, API Design, AWS, react, nodejs, typescript, redocly, reactive programming, CDC, golang, gingonic, GitOps, DX (developer experience), stakeholder management, roadmaps, workshops, discovery.
Yves Schleich
Last position:
Owner and AI Operator at Path to AI
- Operational implementation of the growth levers of growing E-Com brands: SEO, GEO, SEA, shop, conversion, and automation of recurring processes.
- Building and managing specialized AI agent systems that work as roles (SEO, content, conversion, Shopify engineering) instead of single prompts.
- Working either as done-for-you execution or as done-with-you setup, where the brand's team can continue working on its own afterward.
- Customers and projects include TeamTex and Original Veddel, Störtebekker, ConstructionX.
- AI workshops and enablement formats for specialist and leadership teams, plus the joint webinar series AI Vibe Club with Xentral.
Christof Hlipala
Last position:
Senior Frontend Developer at HUK24 AG
- Designing new apps as well as enhancing and running 29 Angular apps for digital claims in an Nx monorepo
- Maintaining and improving a shared component library with ~300 libraries for multiple product teams
- Migrating all apps to a new design system including its component library and systematic refactoring
- Developing and maintaining the CI/CD pipelines (Jenkins, Azure DevOps, Terraform, AWS)
- Managing releases independently including branch handling, versioning, PR coordination and production deployment
- Implementing and maintaining tracking (Adobe Analytics)
- Ensuring accessibility according to BFSG/WCAG
- Test-driven development (TDD) with Jest and Cypress
- Code reviews, mentoring and setting up best practices in the team
- Technologies: TypeScript, Angular 16-20, RxJS, NgRx, Nx (Monorepo), npm, HTML, (S)CSS, Storybook, Jest, Cypress, Cucumber, Husky, Node.js, Git, AWS, Azure DevOps (Repos & Pipelines), Jenkins, Terraform, TDD, BFSG, WCAG, Nexus, IntelliJ, Adobe Analytics
Faruk Sadriu
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
Mani Yazdi
Last position:
Full-Stack Developer at Continentale Krankenversicherung a. G.
- Set up the new digitization strategy.
- Using Camunda as a process engine, a new way of handling batch and dialog tasks is created.
- In close cooperation with the business department, the individual processes are created and put into production.
- Forms for controlling manual interventions, e.g. when adjusting applications, are implemented.
- Gradual migration of old code from IBM WebSphere to JBoss.
- Skills: Arquillian, Camunda, Initiative, Empathy, Hibernate, Jackson, Java/JEE, JBoss, Jersey, JSON, JUnit, Openness to criticism, Willingness to learn, REST, Teamwork, WebServices.
Eduard Haris
Last position:
Senior Java Developer at Deutsche Bahn
- Implemented asynchronous communication with Kafka Streams to update user and group data in microservices
- Conducted load and performance tests with JMeter to ensure system stability
- Migrated microservices to current versions of Spring Boot libraries for better maintainability and security
- Optimized Hibernate queries to improve database efficiency
- Deployed new microservices on AWS infrastructure using Kubernetes for scalability and fault tolerance
- Created OpenSearch dashboards to monitor and analyze system metrics
- Integrated Azure Entra user accounts via SCIM by implementing all necessary REST endpoints
- Improved response times through asynchronous processing in separate threads for better performance
- Enhanced Android device logging capabilities for easier troubleshooting
- Refactored database schema with Flyway for consistent and traceable migrations
- Updated AWS Cognito user settings to optimize user management
- Offloaded resource-intensive tasks from the main microservice into separate Docker containers to boost performance
- Used technologies: Java, JavaScript, Kotlin, Angular, Maven, Spring Boot, Spring Security, JUnit, Tomcat, Spring Data, Spring Cloud, Hibernate, Jackson, microservices, Docker, Kubernetes, OpenSearch, Grafana, OpenAPI, SonarQube, PostgreSQL, MySQL, JMeter, Kafka, Flyway, AWS, Azure, Jira, Confluence, Agile, Scrum, SAFe
Philip Ostendorf
Last position:
Integrated Executive Producer at Caesar Nordpol GmbH
- Lead producer for corporate communications for Boehringer Ingelheim in Austria and the USA
- Responsible for execution in Vienna, Los Angeles & New Jersey
- Stakeholder management & client communication
- Coordinating teams across different time zones and on-site
- Efficient management of budget and resources
Soufiane El Hilali
Last position:
Finance Manager - Fund Management and Valuation | Controlling at HV Capital Manager GmbH
Responsible for managing three main funds and multiple SPVs, including the preparation and oversight of accounting, financial controlling, fund reporting, and the execution of capital calls and distributions to maximize financial performance and business success.
Quarterly valuation of portfolio companies for investor reporting and year-end financial statements according to EVCA/IPEV.
Leading quarterly accounting and financial reporting for the managed funds, ensuring precision and timely delivery in line with HGB/KAGB standards.
Collaboration with external auditors to support efficient year-end audits.
Preparation of cap tables, calculation of shareholder loan balances, and distribution simulation (waterfall calculation) for portfolio companies.
Responsible for the creation of integrated financial models and business plans.
Project work, such as fundraising, further digitalization of fund control and reporting processes, and undertaking various special valuation projects.
Collaboration in tax and accounting with external service providers (Aztec Jersey and Lux).
Oversee regulatory compliance, including reporting to the German Federal Bank, BaFin, FATCA, and CRS.
Dmitry Varlamov
Last position:
Fullstack Software Developer at Mercedes-Benz Tech Innovation
- Backend development of the cloud-based microservice
- Frontend development of the microfrontend
- Migration of the cloud backend environment
- Rollout of the distributed high-availability Privacy Data Service
- Technologies: Java, Kotlin, Spring Boot, REST Services, Kubernetes, Microsoft Azure, Cloud Security, OpenAPI, Postman, JavaScript, Vue.js, AngularJS, TypeScript, Micro Frontend, Redis, Kibana, Grafana, CI/CD, GitHub Actions, Jenkins, Helm Charts, Sec-Hub, Black Duck, Docker, Maven, Git, Scrum
Rolf Mainka
Last position:
Lead Developer and Tester of Domain Applications for the Zensus2021 Project at Federal Statistical Office
- Kubernetes, AWS cloud, Docker, RESTful services, ActiveMQ, Oracle Advanced Queuing, JBoss EAP, Spring Batch, Git, Keycloak, Kafka, Maven
- Setup of CD/CI pipelines with Jenkins
- Development of automated integration tests
- Performing DevOps tasks
- Regular development-accompanying execution of static code analyses on all releases of the Zensus domain applications with SonarQube
- Setup of an R server for household generation
- Setup of a Kafka server for the CVTS application
- Setup of a Keycloak instance
- Setup of a Jira instance for the Jira migration
- Setup of an IRI Workbench instance and Cosort for test data creation
- Setup of test systems for Java web applications with JBoss 8, JDK 17, and Oracle as well as MySQL databases
- Setup of the corresponding Oracle databases including meaningful domain data
- Identifying vulnerabilities in the technical communication between the domain applications
- Building extensive domain-specific and technical know-how for all Zensus domain applications
- Supporting and advising the specialist departments on the Zensus business processes in pre-production and production
- Conducting load and performance tests with JMeter and bash scripting
Allal Kharaz
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
Martin Reisige
Last position:
CEO & Shareholder at Elsoms International GmbH
- Co-founded a new sales company with majority shareholder Elsoms Seeds and two U.S. shareholders (also principal suppliers).
- Built external manufacturing (treat & pack) and pea seed multiplication programs in Germany, France, and Hungary.
Mario Ellebrecht
Last position:
Developer and Consultant at Freelancer
Discover over 15,000 top freelancers
Statistics of experts using Jersey
Aggregated from the professional profiles of matched freelancers.
Experience
23 years
Position duration
2.7 years
Positions per freelancer
14
Top business areas
Information Technology, Product Development, Operations
Top industries
Information Technology, Retail, Insurance
Certification focus areas
Information Technology, Product Development, Project Management
Bachelor's degree or higher
82%
Master's degree or higher
55%
Doctorate
9%
Certifications per freelancer
1
Most common languages
German, English, French
Speak two or more languages
100%
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 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 Jersey
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
REST APIs
Jersey is a Java framework for building RESTful web services. It implements JAX-RS and is often chosen for services that expose JSON or XML endpoints, internal APIs, and backend integrations.
Core stack
Jersey fits into Java server environments and works well with Jakarta EE, Servlet containers, and common dependency injection tools. Teams use it to shape resource classes, request filters, response handling, and API versioning.
Typical work
- Design and build REST endpoints
- Add validation, error handling, and authentication hooks
- Connect services to databases or downstream APIs
- Tune serialization, content negotiation, and routing
- Review legacy JAX-RS code and stabilize releases
When to bring help
Companies look for Jersey specialists when an API needs to be delivered quickly, refactored cleanly, or fixed after inconsistent implementation. In Germany, this often comes up in enterprise software, platform teams, and integration-heavy products where clear API contracts matter.
What strong experts do
A strong Jersey professional understands REST design, Java fundamentals, and the surrounding runtime, not just annotations. They write maintainable resource code, keep controllers thin, and know how to diagnose issues in filters, mappers, and request handling.
Working model
Jersey work is often remote, because most tasks live in code, tests, and API contracts. On-site collaboration can help when teams need close alignment with product, security, or platform specialists, especially during migrations or API redesigns.
Frequently asked questions
Curious about Jersey? Here are the answers that come up again and again.
Jersey is used to build RESTful web services with the JAX-RS API. Teams use it for backend endpoints, service integrations, and internal APIs that need clear request and response handling. It is a common choice when a Java system must expose stable HTTP interfaces.
Jersey is the JAX-RS reference implementation, so it follows the JAX-RS model closely. Spring Web MVC and Spring Boot REST use a different programming style and are often chosen when a team already standardizes on Spring. The better choice depends on the surrounding stack, existing code, and how much JAX-RS consistency you want.
Jersey is not the same thing as JAX-RS, but it is the best-known implementation of it. JAX-RS defines the API and programming model, while Jersey provides the runtime and libraries that make it work. If a project says “JAX-RS” or “Eclipse Jersey,” it is usually referring to this same ecosystem.
A strong Jersey specialist should also know Java, HTTP semantics, JSON mapping, and basic security concepts such as authentication and authorization. Experience with Jakarta EE, Servlet containers, testing tools, and dependency injection is also useful. In integration work, knowledge of databases and downstream services helps a lot.
A small Jersey endpoint can be handled by someone with solid Java and REST experience. Larger systems need deeper knowledge of request filters, exception mapping, serialization, validation, and deployment details. The more business-critical the API, the more important proven delivery experience becomes.
Yes, Jersey work is often a good fit for remote collaboration because the main deliverables are code, tests, and API contracts. For teams in Germany, remote work is especially practical when the expert can communicate clearly in English and align well with local product and platform teams. On-site sessions still help during workshops, handovers, or architecture reviews.
Look for a Jersey professional who can explain API design choices, not just write annotations. Good signs are clean resource structure, thoughtful error handling, proper validation, and tests that cover real request flows. They should also understand how Jersey behaves inside the broader Java runtime.
Choose Jersey when JAX-RS compatibility, existing Java service design, or enterprise integration matters more than adopting a new style. It is often the right fit for long-lived backend systems that already use Jersey or JAX-RS patterns. If your team wants to keep the API layer close to standard Java web-service conventions, Jersey is a strong option.
The average hourly rate of freelancers in Germany who have used Jersey in their recent projects is 107 €, which corresponds to a daily rate of about 859 € based on an 8-hour working day.
Of the freelancers in Germany who have used Jersey in their recent projects, 82% hold at least a Bachelor's degree, 55% hold at least a Master's degree, and 9% hold a doctorate.
On average, freelancers in Germany who have used Jersey in their recent projects have 23 years of professional experience, with a single engagement typically lasting around 2.7 years.
The most common languages among freelancers in Germany who have used Jersey in their recent projects are German (100%), English (100%), and French (29%).
The most common industries among freelancers in Germany who have used Jersey in their recent projects are Information Technology (79%), Retail (50%), and Insurance (43%).
The most common business areas among freelancers in Germany who have used Jersey in their recent projects are Information Technology (86%), Product Development (86%), and Operations (50%).
Main locations of FRATCH Experts, who have recently used Jersey
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
