OpenFeign Experts in Germany
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Meet FRATCH Experts in Germany, who have recently used OpenFeign
Ramazan C.
Last position:
Fullstack-/DevOps Engineer at BKA (Federal Criminal Police Office)
Development and further development of an internal platform for managing and providing technical resources, virtual machines, and infrastructure services. The platform supports self-service processes and covers functions that are conceptually comparable to cloud management solutions like Azure or AWS.
- Responsible involvement in the design, development, and implementation of new backend and frontend features
- Hands-on development with Java, Spring Boot, Python, and Angular
- Implementation of REST interfaces, business logic, validations, and integrations into existing system landscapes
- Further development of modern web interfaces with Angular, including connection to backend services
- Participation in architecture and design decisions within the team, especially with regard to scalability, maintainability, and clean interfaces
- Containerization and deployment of applications with Docker, Kubernetes, and Helm
- Support with CI/CD processes and deployment to Kubernetes-based environments
- Work in the environment of vSphere, Broadcom, GitLab CI/CD, ArgoCD, Maven, npm, and NuGet
- Close collaboration with developers, business teams, DevOps, and other technical stakeholders
- Analysis of technical requirements, deriving suitable solutions, and independent implementation in an agile team
- Use of GitHub Copilot to support code generation, refactoring, test case creation, and technical documentation
Methods/ tools/ technologies: Languages & frameworks: Java (21), Spring Boot (4.x), Python, Angular, Robot Framework, Kubernetes, Helm Persistence: PostgreSQL, MongoDB, Hibernate, Liquibase Architecture & communication: REST, gRPC, GraphQL, Apache Kafka, OpenAPI, Microservices, Event Driven, Domain Driven Design Cloud & infrastructure: Terraform, Docker, Rancher, Helm, Ansible Security: OAuth2, MS (Entra ID), web security, Keycloak (extensions for detailed group rights) DevOps: GitLab CI/CD, Ansible, Maven, Gradle, Grafana, Prometheus, Git, GitHub Copilot Testing & QM: JUnit, Robot Framework, automated component and integration tests, E2E tests with Playwright, Testcontainers, EasyMock Methodology & approach: Kanban, JIRA, Confluence, Clean Code
Sabahattin K.
Last position:
Sole responsibility (design, development, infrastructure, operations) at Own project busik.ch
- Ride-sharing and bus platform, live and fully functional. Backend with Spring Boot 4.1 on Java 21, PostgreSQL with Flyway, and Testcontainers integration tests. Hosted in my own AWS account (ECS Fargate, ALB, ECR, IAM Least-Privilege) with CI/CD via GitHub Actions and OIDC federation without static credentials. Development fully AI-supported with Claude Code, including custom skills and project-specific memory. Spring Boot · Java 21 · PostgreSQL · Flyway · Docker · AWS ECS/ALB/ECR · CI/CD · GitHub Actions · Claude Code
Ali H.
Last position:
Senior Java Developer at Accenture
Client: UOB Bank
Projects: Web Server Management; Online Account Opening; Online Account Lending
Develop and support enterprise-grade backend services for banking/insurance workflows using Java 17 and Spring Boot.
Design REST APIs, platform integrations and backend services for customer onboarding, account workflows and lending journeys.
Modernize legacy services into scalable microservices while improving reliability, maintainability, CI/CD and production delivery.
Optimize PostgreSQL/MongoDB data access patterns and collaborate with Agile teams through reviews and technical guidance.
Environment: Java 17, Spring Boot, REST APIs, Microservices, PostgreSQL, MongoDB, Docker, Jenkins, GitLab, SonarQube, Agile
Dimitri S.
Last position:
Fullstack Developer, Integrator at Generali Deutschland Versicherung AG
- Developing automated build and deployment processes for the exclusive front office systems
- Integrating the front office systems into the IT infrastructure
- Developing innovative, user-friendly sales software for financial advisors
- Ensuring quality and flexibility through automation and working with CI/CD
- Working according to DevOps principles
- Operating the software together as a team in the AWS cloud and Azure cloud
- Deploying software artifacts to testing and production environments
- Maintaining the test environments
- Performing error analysis and providing information for further root cause analysis
- Maintaining and supporting the build pipeline
- Supporting load testing
- Coordinating the batch execution schedule with batch automation
- Creating concepts to further develop the software packaging process
- Building and delivering components to partners
- Developing GitLab and Jenkins pipelines for building, deploying and integrating components
- Automating processes with Spring Boot applications with a GUI (Thymeleaf, Angular 19)
- Developing RESTful Spring Boot applications with Kotlin and Angular 19, JDBC and REST accesses, data exchange via SFTP, XML (JAXB)
- Designing components using Domain-Driven Design (DDD)
- Replacing cmd and bash scripts with Spring Boot applications with a GUI
- Replacing Java 8 applications with JSP by Spring Boot 3 applications (Thymeleaf, Angular)
- Implementing frontend and backend authentication via Keycloak
- Writing JUnit tests with Mockito
- Increasing code coverage for SonarQube analysis
Olaf N.
Last position:
Frontend Engineer at Danaher/Hach Lange GmbH
- Developed a SolidJS frontend UI for a spectrometric water analysis system on an ARM-based embedded Linux platform
- Prototyped UI in TypeScript React/Nx with LitElements and MQTT integration
- Built production UI using SolidJS, SUID, i18next, Ajv, MQTT.js, C3.js
- Refined requirements with UX team and water analysis system engineers
- Defined and documented system architecture, MQTT message formats, frontend architecture, and development setup
- Set up frontend system from scratch, implemented domain-oriented type system, UI components, and application state
- Managed MQTT pub/sub services and schema-based message validation in frontend
- Coached two junior frontend developers
- Worked in an agile remote team using JIRA, Git, and Bitbucket
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.
Ioan D.
Last position:
Senior Software Developer at ING
- Tribe Home, Product Area 4 - Customer in Life, Squad Cybertron.
- Analysis, design, development, and testing of new requirements for Optimmo, mortgage financing software.
- Analysis, design, development, and testing of the JEE application MWS kredit-baufi.
- Analysis, design, development, and testing of the Wicket Optimmo application.
- Analysis, design, development, and testing of kredit-baufi batch programs.
- Migration of kredit-baufi batches to RHEL9.
- CiL SCS consumer pacts with Finagle.
- CiL SCS touch point architecture integration.
- Team size: 10.
- Tools / Frameworks: OpenJDK Java 17, Kotlin 1.6.0, Azure, Jenkins, Stash, JEE, GitLab, JIRA, Confluence, git, Spring 6.0, Spring Cloud, Spring Data, Hibernate, JPA, JMS, Kafka, Oracle, PL/SQL, Red Hat Enterprise Linux (RHEL), Maven, REST, JBoss, IntelliJ IDEA, Wicket 9 and 10, Istio.
Henning P.
Last position:
Backend Systems Development at Deutsche Bank/DWS/Morgenfund
- Developed backend systems for the DWS Investment App, a white-label investment solution (robo-advisor), and an investment solution for institutional clients.
- Java 8-17, Kotlin, Spring Boot, Spring MVC, OpenAPI 3.0, JPA, JDBI, Oracle, Hazelcast, JXLS, Apache POI, Apache PDFBox, Apache Kafka & Avro, Active MQ, Elasticsearch, React Native, Spock Test, IntelliJ IDEA, Kubernetes, Helm, Microservices/Netflix-Stack, TeamCity, Splunk.
- Kanban team, continuous integration.
- Migrated existing applications from Deutsche Bank's private cloud environment to Azure as part of a carve-out.
Discover over 15,000 top freelancers
Statistics of experts using OpenFeign
Aggregated from the professional profiles of matched freelancers.
Experience
19 years
Position duration
1.4 years
Positions per freelancer
15
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Banking and Finance, Government and Administration
Certification focus areas
Information Technology, Business Intelligence, Operations
Bachelor's degree or higher
100%
Master's degree or higher
50%
Certifications per freelancer
3
Most common languages
German, English, Turkish
Speak two or more languages
100%
Based on our profile pool as of 16 Oct 2026.
Daily rate distribution
The chart shows how the daily rates of experts in this technology in Germany are distributed, based on recent contracts on our platform. Each bar covers a rate range — its height shows the share of experts charging within that range.
Average rates of experts in Germany using OpenFeign
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 16 Oct 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
OpenFeign 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 (88%)
- Government and Administration (63%)
- Automotive (50%)
- Energy (50%)
- Healthcare (50%)
- Insurance (50%)
- Transportation (38%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
What OpenFeign does
OpenFeign is a declarative HTTP client for Java applications. Teams define an interface and annotations, then use it to call remote REST services without writing repetitive request code. In Spring applications, Spring Cloud OpenFeign adds integration with service discovery, configuration and common Spring patterns.
Typical service integrations
OpenFeign is used where one application needs a clear, maintainable client for another service. Common deliverables include:
- Typed clients for internal REST APIs
- Service-to-service calls in Spring Boot systems
- Integrations with payment, identity and logistics services
- Shared request, response and error models
- Client configuration for separate environments
Ecosystem and tooling
Strong OpenFeign work depends on more than declaring interfaces. Specialists commonly combine it with Spring Boot, Spring Cloud, Maven or Gradle, service discovery and API documentation. They may also configure HTTP transports, Jackson serialization, OAuth2 or other authentication methods, logging, metrics and distributed tracing.
When companies need expertise
Companies bring in freelance expertise when a growing microservice landscape has inconsistent clients, unclear failures or fragile integrations. A specialist can introduce shared conventions, migrate handwritten HTTP calls, connect legacy services and prepare clients for production traffic. In Germany, this work often supports industrial, financial, retail and logistics systems that require dependable communication between services.
Delivery and collaboration
An OpenFeign professional should clarify API contracts, compatibility rules and operational requirements before writing client interfaces. Remote collaboration works well when repositories, API specifications, test environments and decision owners are accessible. For on-site or German-speaking teams, language ability and familiarity with local delivery processes can make workshops and incident work smoother.
Signs of strong expertise
Quality is visible in the details of the client and its failure behavior. Look for professionals who can explain when to use timeouts, retries, circuit breakers and fallbacks, and who test both successful and failed responses. They should also understand idempotency, versioning, observability and secure credential handling.
- Separates transport concerns from business logic
- Tests contracts, serialization and error paths
- Avoids unsafe retries and hidden blocking behavior
- Documents configuration and operational assumptions
Frequently asked questions
Need clarity? These are the questions we hear most often about OpenFeign.
OpenFeign is used to call HTTP and REST services through annotated Java interfaces. It is especially useful in Spring Boot microservices, where teams need readable clients for internal APIs or external providers.
OpenFeign offers a declarative interface, so it can reduce repetitive request-building code. WebClient is better suited to reactive and streaming workloads, while RestClient provides a direct synchronous API with more explicit request control.
A strong OpenFeign specialist should understand Java, Spring Boot, REST contracts, JSON serialization and HTTP semantics. Useful adjacent skills include OAuth2, service discovery, resilience patterns, testing, observability and CI/CD.
The required depth depends on the assignment. A small client integration may need solid Java and REST knowledge, while a microservice migration calls for experience with API versioning, failure handling, tracing and production operations.
Yes. OpenFeign work is usually well suited to remote collaboration because interfaces, API specifications, tests and configuration can be reviewed online. On-site sessions may still help when teams need architecture workshops, incident analysis or close coordination with German-speaking stakeholders.
Spring Cloud OpenFeign can be combined with resilience libraries and configured HTTP clients to manage timeouts, retries and circuit breakers. These controls need careful design because retries can amplify load or duplicate non-idempotent operations.
Review interface clarity, request and response models, authentication, timeout settings and error mapping. A capable Feign professional also provides tests for contract changes, meaningful logs and metrics, and documentation for environment-specific configuration.
OpenFeign may be a poor fit for highly reactive data flows, streaming responses or cases requiring very fine-grained control over each request. A lower-level HTTP client or WebClient can be more appropriate when asynchronous execution, backpressure or custom transport behavior is central.
The average hourly rate of freelancers in Germany who have used OpenFeign in their recent projects is 87 €, which corresponds to a daily rate of about 697 € based on an 8-hour working day.
Of the freelancers in Germany who have used OpenFeign in their recent projects, 100% hold at least a Bachelor's degree and 50% hold at least a Master's degree.
On average, freelancers in Germany who have used OpenFeign in their recent projects have 19 years of professional experience, with a single engagement typically lasting around 1.4 years.
The most common languages among freelancers in Germany who have used OpenFeign in their recent projects are German (100%), English (100%), and Turkish (25%).
The most common industries among freelancers in Germany who have used OpenFeign in their recent projects are Information Technology (100%), Banking and Finance (88%), and Government and Administration (63%).
The most common business areas among freelancers in Germany who have used OpenFeign in their recent projects are Information Technology (100%), Product Development (100%), and Quality Assurance (88%).
Main locations of FRATCH Experts, who have recently used OpenFeign
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
