Java Developers in Germany
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Meet FRATCH Java Developers in Germany
Fred Hauschel
Last position:
Software Architect and Developer at Personal project
Recurring problem in my own AI-assisted projects: requirements analysis, use cases, and architecture decisions are created quickly with AI support, but they remain hard to trace and are scattered across Markdown files – knowledge is lost as soon as it is no longer in the context window. arknet turns requirements engineering and architecture knowledge into structured, verifiable data instead of plain text: requirements, use cases, and architecture decisions as a fully linked knowledge graph, traceable from the requirement to the architecture decision – queryable for both people and AI agents. Technically built on RDF/OWL and its own MCP server.
Result: MCP daemon running, Docker image automatically published to GHCR, nine hexagonal modules, eleven ADRs (including an open-core license model). Requirements engineering and ubiquitous language hexagon active. Public since 07/2026 as a Community Edition under Apache-2.0 (github.com/kogn-io/arknet), together with the Claude Code plugin and the GHCR image; open-core model.
Label: Java, Maven, RDF, RDF4J, OWL, SPARQL, Model Context Protocol, Spring AI, Docker, GitHub, Git, Claude Code, Obsidian, DDD, Hexagonal Architecture, ArchUnit, JUnit, AssertJ
Yusuf Congar
Last position:
Senior Software Engineer at LeiKon GmbH
- Development of scalable backend applications with C#/.NET and Java
- Design and implementation of distributed microservice architectures
- Development and integration of REST APIs for industrial applications
- Development of modern web applications with React, Angular, and TypeScript
- Implementation of MQTT-based communication solutions
- Integration of industrial protocols such as OPC UA and Modbus TCP
- Development of batch, process control, and HMI components
- Containerization and deployment of applications with Docker
- Conducting code reviews and supporting architecture decisions
- Close collaboration with product owners, QA, and interdisciplinary teams
- Analysis of business requirements and implementation of technical solutions
- Further development of existing software architectures with a focus on maintainability and performance
Technologies: C#, .NET, ASP.NET Core, Java, C++, React, Angular, TypeScript, Vue.JS, MQTT, OPC UA, Modbus TCP, Docker, GitLab, MariaDB, MySQL, Linux
Marc Smyk
Last position:
Fullstack Developer at PLANT-MY-TREE
PLANT-MY-TREE®-per-order
The application allows Shopify merchants to automate tree-planting orders for each incoming order. By integrating ecological contributions directly into the checkout process, manual work for tracking and billing reforestation initiatives is eliminated. The system increases transparency for end customers through real-time visualizations of the ecological impact directly in the storefront. The architecture is based on a modular monolith with Spring Boot in the backend and an integrated React app inside the Shopify admin area. The solution uses webhooks for event-driven capture of order data and integrates the ERP system weclapp for automated monthly invoicing. An app proxy mechanism provides dynamic statistics such as CO2 compensation and planted trees without any performance loss for the merchant shop.
Tasks:
- Design of the modular software architecture based on Spring Modulith to ensure high maintainability
- Development of the event-driven business logic for evaluating Shopify orders using webhooks
- Implementation of automated invoicing by connecting the weclapp REST API
- Building the frontend using React Router and Shopify App Bridge for native integration
- Design of the database model and implementation of the persistence layer with JPA/Hibernate and Prisma
- Integration of internationalization processes for global use in the frontend and email communication
- Automation of deployment processes using Docker and GitLab CI/CD
Project skills: Java, Spring Boot, Spring Security, Spring Modulith, Hibernate, JPA, REST API, PostgreSQL, Maven, Liquibase, React, TypeScript, React Router, Vite, Node.js, Prisma, Zod, Docker, Docker Compose, GitLab CI/CD, Shopify CLI, Shopify App Bridge, Polaris, weclapp, i18next, Lombok, Vitest
Stefan Amann
Last position:
Sole Architect and Developer at Bauernhof-Eis Stangl GbR
Design and implementation of a compact ERP, CRM, accounting, and production-planning platform for a German food manufacturer. The system replaces Rechnung11, self-built Excel sheets, and manual processes for fewer than 10 internal users.
- Designed and implemented the full platform architecture as sole architect and developer.
- Built modules for customer management, B2B order handling, invoicing, production planning, and accounting support.
- Implemented DATEV export, ZUGFeRD/XRechnung e-invoicing, FinTS bank statement synchronization, and GoBD audit trail concepts.
- Used AI-supported workflows for prototyping, test support, and implementation acceleration while retaining full architecture, review, testing strategy, and technical ownership.
Technology: Java 23, Spring Boot 3, Spring Data JPA, Spring Security, Vue 3, TypeScript, PostgreSQL, Flyway, REST, OpenAPI, JWT, TOTP, RBAC, DATEV, FinTS, ZUGFeRD, XRechnung, GoBD, JUnit, Mockito, Testcontainers, Playwright, Docker, GitLab CI/CD
Uday Vanaparthy
Last position:
Full Stack JAVA Developer & DevOps Engineer at Deutsch Börse (DBAG)
SCS provides its services to various trading and settlement locations and offers a variety of functionalities related to settlement. The business objectives of the C7 SCS are:
- Safeguard against counterparty risk.
- Reduction of External Settlement Volume.
- Central Risk Management.
- Post-Trade Anonymity.
- Efficient Failure Management.
Technologies: Java 17, Spring Boot 3, Microservices (REST API), Spring Data JPA/Hibernate, Sonar Qube, fortify findings, Mockito, Jenkins, Docker RHEL-OpenShift, Maven, Pod man, GitHub, JIRA, WIKI, Liquibase, Swagger API, AMQP, Apache Camel, GCP Machines Infra setup, Terraform, PostgreSQL, React.js, Instana, Graylog, Daisy LLM Usage, GitHub Copilot.
Roles and Responsibilities:
- Followed SOLID Design Principles for Microservice implementation.
- Reviewed and refactored codes were appropriate in line with best practices, accessibility, security, quality, and performance.
- Developed applications using build tools, Maven, and continuous integration using Jenkins.
- Followed the CI/CD process and ensured that the developed code passed the Sonar Qube quality gate standards.
- Used DBAG Artifactory Repository Manager for updated application images, versions, and jar files.
- Deployed the microservices using the container system Padman and container orchestration tools like OpenShift.
- Used Liquibase for the database version control system.
- Enhanced application performance by optimizing Java code and implementing efficient algorithms.
- Experienced in identifying and remediating known CVEs in third-party libraries using SCA tools to ensure secure and compliant security Clearing Services components, Fixed the issues in SCS components.
- Experienced in vulnerability remediation, including identifying security weaknesses, prioritizing risks, and implementing effective fixes to strengthen SCS System.
- Enabled mTLS for database authentication and broker setups to enforce encrypted, certificate-validated communications.
Oliver Bodemer
Last position:
Senior Software Architect at private Project
- Designed blockchain-based learning platform with event-driven architecture, integrating RESTful APIs for personalized learning paths
- Developed scalable microservices using Java, Python, and React in Kubernetes, enabling real-time data processing
- Implemented smart contracts (Solidity) for secure course purchases and mentor engagement
- Led AI-supported matching system (DecisionTreeRegressor) to optimize learning recommendations
Marcus Biel
Last position:
Java Cloud Expert at Unknown
- Modernized and modularized a legacy monolith to enable independent team workflows
- Migrated from Java 8 to Java 21 and from Spring Boot 2 to Spring Boot 3.3
- Simplified Maven project structure, reducing build time from 15 minutes to 50 seconds
- Converting architecture to a hexagonal DDD architecture with end-to-end integration tests using RestAssured and JUnit 5
- Tools and technologies: Java 8-22, Spring Boot, Mockito, AssertJ, RestAssured, Hibernate, OracleDB, Flyway, REST, JSON, Docker, Kubernetes, AWS, Bitbucket, GitHub, SonarQube, IntelliJ IDEA Ultimate
Emmanuel Lampe
Last position:
Founder and sole developer
- Development of a SaaS platform for esports teams with roles, scheduling, statistics, and billing
- Planning and implementation of the architecture, external API integrations, and operations
- Stack: Laravel 13, React 19, TypeScript, PostgreSQL, Redis, and Stripe
Tymofii Sukhachov
Last position:
Senior Java Developer / Architect at Modirum
Software design and implementation of 3-D Secure payment protocols
Created a spring boot based distributed solution for processing, handling and distribution of large amount of data: card ranges coming from Visa, MasterCard, AMEX, etc
Architectural solution for self-hosted and client-hosted setups including k8s-based platforms
Setup of development, release and delivery processes from scratch
Frank Bergmann
Last position:
System Engineer at Frequentis Comsoft
- Migrate company software to RHEL10
- Development in Bash, Python, C, Ansible
Björn Wilmsmann
Last position:
Software Audit and Architecture Consulting: Portal Software
- I conducted a software audit and architecture consulting for an existing portal software for infrastructure provisioning at a company that offers virtual reality environments.
- Role: Mentoring and Consulting
- Technologies used: Java
Jens Oberender
Last position:
Freelance Java Developer / DevOps Engineer at Undisclosed defense company
- Extension of OSGi modules in a complex communication solution
- Debugging communication with Wireshark and remotely in the JENS test environment
- Migration of tests from TestNG to JUnit 5 with Mockito and AssertJ
- Updating vulnerable dependencies and improving code quality
- Changes to the Vaadin frontend
- Increasing test coverage
Marie-Josée Mache
Last position:
Java Engineer / Developer at Davaso GmbH
- Involved in the full development lifecycle, including design, coding, testing, and deployment of Java-based applications.
- Built and maintained high-performance RESTful APIs and microservices, ensuring scalability and reliable data exchange.
- Practiced code reviews, used version control systems (e.g., Git), and collaborated closely with cross-functional teams to deliver robust software solutions.
- Implemented, managed, and optimized complex business logic and decision-making processes using the Drools Rules Engine, leveraging DRL (Drools Rule Language) for dynamic configuration.
- Developed software solutions for a major service provider in the healthcare insurance sector, specifically focusing on claims processing and reconciliation logic to ensure cost-effective reimbursement for health funds.
Mohamed Keita
Last position:
Interim Senior Camunda & BPMN Consultant, Spring Boot & Java Backend Developer at GEMA/IT4IPM GmbH
- Subject matter expert for the client on modeling and developing Camunda BPMN 2.0
- Development of new features and APIs, and coordination of tasks
- Design and development of RESTful APIs with Swagger (code first)
- Creation of target designs, high-level concepts, and requirement specifications
- Analysis and evaluation of alternative solution approaches
- Integration of external IT systems (ANUBIS, SES, ZPS) via Google GCP Pub/Sub and RESTful web services
- Pair programming, code reviews, and collaboration with API product owners
- Consulting on transforming legacy BPMN workflows and configuring Camunda BPM
- BPMN and DMN modeling and implementation in short iterations
- Operational support, bug fixing, and knowledge documentation
- Use of TDD, static code analysis with SonarQube, and integration tests
- Automation of test cases in Java and analysis of stack traces/logs on GCP-PROD
- Identification and execution of test data and documentation of test results
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
Discover over 15,000 top freelancers
Java Developers statistics
Aggregated from the professional profiles of matched freelancers.
Experience
18 years
Position duration
1.9 years
Positions per freelancer
14
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Banking and Finance, Insurance
Certification focus areas
Information Technology, Product Development, Project Management
Bachelor's degree or higher
97%
Master's degree or higher
59%
Doctorate
17%
Certifications per freelancer
2
Most common languages
German, English, French
Speak two or more languages
93%
Based on our profile pool as of 26 Aug 2026.
Daily rate distribution
The chart shows how the daily rates of freelancers in this role 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 for Java Developers in Germany
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 26 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
About the role
Core work
A Java Developer builds and maintains backend software that is stable, testable, and easy to extend. Companies bring in freelance Java talent for new product builds, platform updates, integrations, bug fixing, or a rescue phase when delivery has slipped. The work often spans API design, business logic, database access, and support for existing enterprise systems.
- Build REST services and backend modules
- Refactor legacy Java code into clearer components
- Connect systems through APIs and messaging
- Add automated tests and improve code quality
- Support releases, troubleshooting, and production fixes
Skills and stack
Strong Java Developers work across the core ecosystem, not just the language itself. They know how to write maintainable code, review edge cases, and make trade-offs that fit the product and the team.
- Java, Spring Boot, Spring MVC, Spring Data
- Hibernate, JPA, Maven or Gradle
- REST, SOAP, Kafka, RabbitMQ
- SQL, Oracle, PostgreSQL, MySQL
- JUnit, Mockito, Git, Docker, Kubernetes
When to hire
Freelance Java developers are a good fit when you need targeted delivery without a long hiring cycle. This is common for short-term feature work, migration projects, cloud transitions, or when a permanent team needs extra backend capacity. In Germany, companies in industry, finance, logistics, insurance, and B2B software often need Java support for systems that must stay reliable while they evolve.
Typical signs you need this role include:
- Existing Java systems need ongoing changes
- A new service must fit into a larger architecture
- An old application must be modernized safely
- Integration work is blocking delivery
- The team needs help with testing or code reviews
What good looks like
A strong Java Developer writes code that other engineers can read and maintain. They understand the domain, ask the right questions, and can work with product owners, architects, and QA without slowing the team down. Good freelancers also know when to improve a design and when to keep a stable system unchanged.
They usually bring:
- Clear backend thinking and practical problem solving
- Experience with enterprise patterns and clean APIs
- Careful testing and disciplined version control
- Familiarity with Agile delivery and remote teamwork
- Calm handling of production issues and technical debt
Frequently asked questions
Before you brief your next project: the most common questions about Java Developers.
A Java Developer usually builds backend services, business logic, and integrations that connect different systems. The work can also include refactoring legacy code, improving test coverage, and supporting releases. In many projects, the freelancer joins an existing team and works inside the current architecture rather than replacing it.
Look for solid Java fundamentals, strong experience with Spring Boot, and a clear understanding of APIs, databases, and testing. A good freelancer should also be comfortable with Git, code reviews, and production debugging. For larger systems, knowledge of messaging, cloud deployment, and clean architecture is often important.
A Java Developer is a backend developer who focuses specifically on the Java ecosystem. That usually means Spring, JPA, Maven or Gradle, and the enterprise patterns that come with long-lived business systems. Some backend developers work in other languages, so the distinction matters when your stack is Java-based.
A freelance Java programmer makes more sense when the need is focused, urgent, or tied to a specific delivery phase. This is often the case for migrations, temporary team gaps, system recovery, or a feature set with a clear end. If you need immediate backend capacity without a long onboarding cycle, a freelancer is often the better fit.
Yes, most Java work can be done remotely, especially API work, service development, testing, and refactoring. For teams in Germany, remote collaboration often works well as long as communication is clear and access to the codebase, tickets, and deployment process is in place. Some projects still benefit from on-site workshops at the start or during important releases.
Most projects use Spring Boot, JPA or Hibernate, SQL databases, Git, and testing tools such as JUnit and Mockito. Depending on the setup, a Java engineer may also work with Kafka, Docker, Kubernetes, and cloud services. The exact stack depends on whether the project is a greenfield build, a migration, or work on an existing enterprise platform.
Ask for recent examples that match your stack and your type of system. A strong Java Developer can explain design choices, testing strategy, and how they handled production issues or legacy constraints. Code samples, a short technical interview, and a discussion of real project trade-offs tell you far more than a job title alone.
A freelancer should expect to work with existing standards, review processes, and release routines. In a good setup, the team shares architecture context, business priorities, and access to the main tools early. That helps the Java specialist deliver quickly without creating extra coordination work for the client.
The average hourly rate for Java Developers in Germany is 91 €, which corresponds to a daily rate of about 729 € based on an 8-hour working day.
Of the freelancers working as Java Developers in Germany, 97% hold at least a Bachelor's degree, 59% hold at least a Master's degree, and 17% hold a doctorate.
On average, freelancers working as Java Developers in Germany have 18 years of professional experience, with a single engagement typically lasting around 1.9 years.
The most common languages among freelancers working as Java Developers in Germany are German (95%), English (95%), and French (11%).
The most common industries among freelancers working as Java Developers in Germany are Information Technology (91%), Banking and Finance (61%), and Insurance (48%).
The most common business areas among freelancers working as Java Developers in Germany are Information Technology (100%), Product Development (98%), and Quality Assurance (64%).
FRATCH Java Developers main locations
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.
Munich 
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Get in touch with the FRATCH team and we will get back to you within 4 hours.
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Philipp Thomaschewski
FRATCH CEO
