JAX-RS Experts in Germany
, matched in minutes from over 15,000 CVs with the power of AIHire experts who design REST endpoints, secure Jakarta EE services and integrate JAX-RS with databases, messaging and cloud infrastructure. FRATCH connects you quickly with vetted, available freelancers whose experience matches your technical scope.
Meet FRATCH Experts in Germany, who have recently used JAX-RS
Khalid E.
Last position:
Lead Architect & Developer at kem-consulting
Development of an agent-based governance platform for the automated assurance of EU AI Act compliance and ODA-compliant orchestration of AI services in complex enterprise environments.
Design and implementation of an agent-based "Mission Control" framework (Aletheia Conductor) for autonomous state monitoring and process control.
Development of "Compliance-as-Code" (CaC) solutions based on OPA/Rego for system-wide enforcement of regulatory guardrails.
Integration of TM Forum ODA standards (TMF630, TMF622, TMF642) to ensure interoperability and standardization.
Building a highly available event-driven architecture using Redpanda and CloudEvents v1.0 for near-real-time event processing.
Implementation of an audit-proof "Evidence Chain" through cryptographic linking of trace logs in preparation for automated audits.
Tech Stack: Java 21 (Quarkus Native), TypeScript (Next.js), Redpanda (Kafka API), CloudEvents v1.0, OPA (Open Policy Agent) & Rego, TimescaleDB, ZincSearch, Redis, TM Forum ODA, Git, GitHub, Clean Code Development, Like-C4.
Kiriakos K.
Last position:
Tech Lead / Architect : OTTO API Platform at OTTO
Maturing their API practices on both a business and technology level. My role covers 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, Node.js, TypeScript, Redocly, reactive programming, CDC, Golang, Gin, GitOps, DX (developer experience), stakeholder management, roadmaps, workshops, discovery.
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
Hooman B.
Last position:
Fullstack Developer at Möbel Roller GmbH
- Further development of the existing e-commerce platform based on SAP Commerce (Hybris) to meet the growing demands of digital commerce.
- Ensuring the scalability and performance of the backend, so the platform remained stable and efficient even under heavy user load.
- Development and integration of new OCC REST APIs and services for modular extensions and flexible adjustments, to implement new features quickly.
- Optimization of data flows and interfaces, which significantly improved platform efficiency and system performance.
- Ensuring a maintainable and scalable code base by using Clean Code principles, proven design patterns, and a future-proof architecture.
- Reduction of errors through extensive testing with JUnit, Mockito, and load tests with Gatling, supported by the introduction of automated test processes.
- Improved system performance through targeted refactoring measures and efficient database queries, especially to handle peak loads.
- Use of modern cloud and monitoring tools such as Kubernetes, Google Cloud Platform (GCP), and Grafana to ensure a stable and monitored infrastructure.
- Clear improvement in efficiency, scalability, and reliability of the platform, which now meets the demands of a dynamic and growing e-commerce market.
Niko S.
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.
Boris S.
Last position:
Generalist expert for software development at Mercor
- Training AI models, evaluating images and text UI/UX, turning the provided data into insights through OpenAI Feather as part of the machine learning workflow
Technologies: OpenAI Feather
Thorsten M.
Last position:
Odoo Implementer at N.N.
As project manager for the Odoo implementation at a small company, I was responsible for designing, implementing, and training a fully integrated CRM and accounting system. Through structured requirements analysis, precise data migration, and targeted change management, I was able to complete the rollout in just eight weeks. The project led to a significant reduction in manual tasks, faster business processes, and increased real-time transparency.
Main Responsibilities
Requirements analysis and process mapping Configuration of Odoo modules: CRM, Sales, and Accounting Data migration (Excel/CSV → Odoo) and quality control Creation of workflows, automated email rules, and dashboards Conducting training sessions and providing support after go-live Project coordination (budget, schedule, stakeholder communication)
Key Achievements
Full implementation of the Odoo suite within the set timeframe (8 weeks) 30% reduction in accounting time and 25% acceleration of the lead-to-sale flow 100% customer satisfaction after go-live, based on survey results Successful migration of 100% of existing master data without data loss Establishment of a sustainable support infrastructure (3-month post go-live support)
Impact
Improved decision-making through real-time dashboards and automated reports Increased efficiency and cost savings (≈ €8,000/month) Scalability for future growth (additional modules can be integrated seamlessly) Strengthened sales and finance departments through seamless process integration
This summary highlights how I created concrete and measurable value for the company through structured project work, technical expertise, and targeted training.
Daniel S.
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
Christof H.
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
Waldemar B.
Last position:
Software-Architekt Produktdaten-Management Tool at Ferchau Contract GmbH
- Definition of the software architecture
- Design and development of modules
- Supporting internal employees in the learning and onboarding process
- Tools: SAP CAP / CDS, Java 21, SAP Hana, SAP Business Technology Platform (BTP)
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
Mohsin H.
Last position:
BBM GenAI MiDAS program coordinator for Bosch eBike at Robert Bosch GmbH
The MiDAS program aims to integrate Generative AI across the entire BBM organization. My role is to enable the eBike division to adopt and leverage Generative AI by collaborating closely with the MiDAS team in India.
Management:
- Enable the eBike division to adopt GenAI through tailored solutions.
- Collaborate with the MiDAS team in India to design solutions for Generative AI use cases specific to the eBike division.
- Coordinate with the eBike teams to integrate GenAI systems, tools, plugins, and services provided by the MiDAS team.
- Plan roadmaps with eBike and MiDAS India team Product Managers for the delivery and integration of Generative AI solutions.
Timo H.
Last position:
Software Developer at Continentale Krankenversicherung AG
- Implementation of a REST-based web service for querying contract, claims, customer, and sales data as part of the Dialogmanager project.
- Data release is done in compliance with CoC requirements and individual user permissions from IAM (Identity and Access Management).
- Implementation using JBoss EAP 8.1 (JakartaEE 10) and Java 21 as well as JAX-RS, CDI, Microprofile-Config, Microprofile-OpenAPI.
Jorge E.
Last position:
Bittrich & Bittrich
- Extension and maintenance of the Doktree tax advisory document management tool
- Alfresco and Angular development
- Linux system maintenance
Patrick W.
Last position:
AI Software Engineer at IppenMedia
- Analysis
- Consulting
- Software design
- Development
- Automation
- Testing
- Deployment
- Architecture, development and deployment of various proof-of-concept applications around the integration of current AI interfaces including conversational, realtime voice, images and videos
- Developed best practices for working with agentic systems and AI in practice
- Created code templates
Discover over 15,000 top freelancers
Statistics of experts using JAX-RS
Aggregated from the professional profiles of matched freelancers.
Experience
21 years
Position duration
1.9 years
Positions per freelancer
16
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Banking and Finance, Retail
Certification focus areas
Information Technology, Project Management, Product Development
Bachelor's degree or higher
92%
Master's degree or higher
52%
Doctorate
4%
Certifications per freelancer
2
Most common languages
German, English, French
Speak two or more languages
94%
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 JAX-RS
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.
JAX-RS 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 (65%)
- Retail (48%)
- Automotive (45%)
- Transportation (45%)
- Energy (39%)
- Insurance (39%)
- Government and Administration (39%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
What JAX-RS Does
JAX-RS, now known as Jakarta RESTful Web Services, is a specification for creating REST APIs in Java. It uses annotations to map HTTP methods, paths, parameters and content types to application logic. Companies use it for browser backends, mobile services, partner APIs and internal systems.
Core API Work
JAX-RS experts define resource classes, request and response models, validation rules and consistent error handling. They configure JSON or XML serialization, content negotiation, pagination and API versioning. Strong implementations keep HTTP semantics clear and make contracts easy for other teams to consume.
Ecosystem and Tooling
The specification is implemented by libraries such as Jersey and RESTEasy, often within Jakarta EE application servers or Spring-based environments. Related work can include CDI, JPA, Bean Validation, OpenAPI documentation, OAuth 2.0, JWT, Maven and automated testing. Understanding the move from javax.ws.rs to jakarta.ws.rs is important during platform upgrades.
Where It Fits
- Public REST APIs for web and mobile applications
- Service layers inside Jakarta EE applications
- Integration endpoints for business partners and internal systems
- Microservices that exchange JSON over HTTP
- Legacy Java API for RESTful Web Services modernization
JAX-RS is common in enterprise environments, including manufacturing, finance, logistics and public services in Germany. Its suitability depends on the existing Java and Jakarta EE landscape, operational constraints and the API consumers that must be supported.
When to Bring in Help
Companies bring in freelance expertise when an API needs a clear resource model, a legacy javax.ws.rs codebase must move to Jakarta namespaces, or a service has inconsistent security and error responses. Remote collaboration works well for design reviews, implementation and testing; on-site work can help when access controls or complex enterprise integration require close coordination.
What Good Looks Like
Strong professionals understand REST constraints without forcing every system into a simplistic pattern. They test status codes, serialization, validation, authentication, authorization and backward compatibility. They can explain trade-offs between Jersey, RESTEasy and an application server, document interfaces with OpenAPI, and leave maintainable tests and deployment guidance behind.
Frequently asked questions
Questions about JAX-RS? Start with the answers below.
JAX-RS is used to build RESTful web services in Java and Jakarta EE. It helps teams expose resources over HTTP for web applications, mobile clients, integrations and internal services.
JAX-RS is a standard focused on REST services, while Spring Web MVC is part of the broader Spring ecosystem and offers its own web programming model. The right choice depends on the existing runtime, dependency model, team skills and integration requirements.
A strong JAX-RS specialist usually understands Jakarta EE, CDI, JPA, Bean Validation and JSON serialization. Experience with OAuth 2.0, JWT, OpenAPI, Maven, containers and automated API testing is also valuable.
A JAX-RS professional should have delivered REST endpoints that handle real concerns such as validation, security, error contracts and compatibility. The depth required depends on whether the assignment covers a small service, a platform migration or a wider enterprise integration.
Yes, JAX-RS work is often suitable for remote collaboration because API design, coding, reviews and testing can be performed online. On-site presence may still help when specialists need controlled access to internal systems or close coordination with German-speaking stakeholders.
Ask a JAX-RS expert to explain resource design, HTTP status codes, serialization, validation and authentication choices from a past project. Review whether their APIs have clear contracts, useful tests, consistent errors and safe upgrade plans.
JAX-RS is the specification, while Jersey and RESTEasy are implementations of that specification. Their configuration, extension points and runtime integrations differ, so the existing application server and deployment model should guide the selection.
The JAX-RS namespace changed from javax.ws.rs to jakarta.ws.rs as Jakarta EE evolved. A migration can affect imports, dependencies, application servers, libraries and deployment settings, so compatibility checks and focused regression tests are essential.
The average hourly rate of freelancers in Germany who have used JAX-RS in their recent projects is 101 €, which corresponds to a daily rate of about 808 € based on an 8-hour working day.
Of the freelancers in Germany who have used JAX-RS in their recent projects, 92% hold at least a Bachelor's degree, 52% hold at least a Master's degree, and 4% hold a doctorate.
On average, freelancers in Germany who have used JAX-RS in their recent projects have 21 years of professional experience, with a single engagement typically lasting around 1.9 years.
The most common languages among freelancers in Germany who have used JAX-RS in their recent projects are German (100%), English (90%), and French (13%).
The most common industries among freelancers in Germany who have used JAX-RS in their recent projects are Information Technology (100%), Banking and Finance (65%), and Retail (48%).
The most common business areas among freelancers in Germany who have used JAX-RS in their recent projects are Information Technology (100%), Product Development (97%), and Quality Assurance (71%).
Main locations of FRATCH Experts, who have recently used JAX-RS
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
