Java Experts in Hamburg
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Meet FRATCH Experts in Hamburg, who have recently used Java
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.
Christian Frauer
Last position:
Department Head (Interim) at Municipal utilities and transport company
- Definition and setup of the subject areas
- Building a governance model for the department with the areas of responsibility
- IT strategy, project management, process management, and quality and sustainability management
- Developing a communication strategy within the group
- Creating the IT strategy
- Designing templates, guidelines, and processes for consistent work
- Capturing strategic guardrails and grouping ongoing projects – deriving a roadmap for strategic planning
- Reviewing ongoing projects
- Creating staffing calculations and volume structure
- Defining job profiles
Yashar Sadeghi
Last position:
Managing Director/Consultant at Efficient Consulting
- Led strategic IT and process consulting projects, streamlined business processes, and aligned IT systems with business goals, resulting in a 20% improvement in organizational efficiency.
- Led international transformation projects using agile and traditional methods, managing a cross-functional team of more than 15 professionals and delivering solutions on time and within budget.
- Developed cloud-based ERP/CRM systems (Salesforce, Infor, Microsoft) for clients, ensuring seamless integration and reducing system downtime by 30%.
- Led large-scale change management initiatives, actively involving stakeholders at all levels and driving the successful rollout of innovative systems in global organizations.
- Led requirements analysis and the tender process for clients, identified cost-saving opportunities, and improved operational workflows.
Hoa Josef Nguyen
Last position:
AI Architect and Enabler at Inhouse / AI Business
Technologies: n8n, Notion, OpenAI API, Claude, MS AI Foundry, MS CoPilot Studio, MS CoPilot, LLM, Node.js, Vercel, LangGraph, PostgreSQL, pgEdge, pgvector, Docker, LangChain, Ollama, Open WebUI
- Continuous evaluation and prioritization of internal automation needs
- ~20 AI agents in active use: research, content pipelines, document processing
- 5 n8n workflows for automated data and process control
- Architecture built on the same principles as in customer projects: state management, event-driven orchestration, API integration
- Ongoing operation and further development
Guido Bäcker
Last position:
Independent Management Consultant and Interim Manager at BCTC Unternehmensberatung Guido Bäcker
Consulting, training, and coaching in the financial sector on strategy, organization, and IT topics
MorgenFund: Advising the operator of a fund platform on software selection for a sub-ledger "Cash Accounts" based on Virtual IBANs (VIBAN)
Structuring requirements, market screening, creating RfIs, communicating with vendors, and conducting the selection process
UniCredit/HypoVereinsbank: Workstream lead "Booking and Customer Reporting" in the payment transformation project "PULS"
Business analysis, creating business requirements and aligning solution items as part of the functional specification with the bank's IT service providers
Business analysis of SEPA CT and SWIFT MX (.camt, .pain, and .pacs formats), change management, team lead for a virtual team of fifteen line experts, and stakeholder management
equensWorldline Germany: Program management for three projects of the SWIFT service bureau (CBPR+, ESMIG, and Euro1Step1 migration) as part of the SWIFT MX migration
Managing individual project managers regarding overarching goals and requirements; reporting to internal and external committees and stakeholders; coordinating with dependent projects and programs
Project management/PMO: interim project management, stand-in for project managers, resource planning, budget and cost management, general PMO tasks
Daniel Sedlack
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
Anastasiia Komarenko
Last position:
Senior Test Automation Engineer at E.ON
- Reviewing functional and technical requirements from a testing perspective
- Creating test cases and automated tests to validate requirements
- Performing manual and automated functional, end-to-end, and regression tests
- Documenting test results and tracking defects
- Using models like GPT-4, BERT, and Hugging Face Transformers for automated test case generation, analysis of test results, and improving test coverage, including bias checks and security reviews
- Techs: MS Office, Jira, Zephyr, Confluence, Tosca, stakeholder communication, Agile, Kanban, Scrum, OpenAI API, Hugging Face, PyTorch, LangChain.
Cornelius Höfig
Last position:
Solution Architect at STIHL
- Remodeling of the system architecture for an Azure-based platform aimed at rapid development of new functionalities
- Modeling of a staging concept for the fulfillment of diverse customer and QA needs
- Creation of requirements for, and oversight of, a proof-of-concept supplier project for a Flutter app with highly advanced BLE functionalities
- Comparison of multiple observability platforms for feasibility and requirements fit within the project environment
- Creation of a mobile app architecture based on domain-driven architecture
- Position of technical advisor and accountable solution architect for two development teams
- Execution of architecture reviews and alignment of changes with architectural expectations
- Skills & Technologies: Microsoft Azure , App Services, NodeJS Mono-repository, microservice architecture, domain driven design, self contained systems, requirements engineering, CI/CD, DevOps, API design, solution architecture
Lutz Hühnken
Last position:
Fractional CTO, Interim Engineering Manager, Architect at independent
Strategic technology leadership and architecture consulting.
- Fractional CTO & interim management for startups, scale-ups, and enterprises – technical strategy, team building, architecture oversight, and delivery.
- Architecture consulting on cloud-native, distributed, and event-driven systems: reviews, design partnerships, and ongoing advisory.
- Event-driven architecture training – a hands-on 2-day course for engineering teams
- Conference speaker on distributed systems
Michael Müller
Last position:
IT PROJECT MANAGER (MS Exchange) at Statutory Health Insurance on behalf of Randstad Digital Germany (formerly AUSY Technologies Germany)
Migration from Exchange 2016 to Exchange 2019 and Exchange Online, as well as the introduction of a backup solution and an archiving solution. The goal was a secure, compliant, and high-performance modernization of the email and archiving infrastructure.
Responsibilities as IT PROJECT MANAGER: Overall project management and operational control / Ensuring adherence to costs and resources / Ensuring achievement of project objectives / Ensuring compliance with regulatory requirements and compliance guidelines, including ISMS, ITIL, and data protection regulations / Preparing and delivering management reports for the project sponsors and project committee / Coordinating interdisciplinary teams from Exchange, network, data protection, and IT security / Planning and executing the system migration from Exchange 2016 to Exchange 2019 / Planning and executing the system migration from Exchange 2019 to Exchange Online / Planning and implementing a backup solution for Exchange Online / Coordinating an EU-wide tender for an archiving solution including market analysis with potential vendors / Planning and implementing an archiving solution for Exchange Online / Coordinating and preparing the necessary BAS notifications in the project context / Coordinating and aligning with stakeholders (e.g. business units, external service providers, and suppliers) for requirements definition and implementation
Technical environment: MS Exchange 2016, MS Exchange 2019, MS Exchange Online, MS Office, MS Planner, MS PowerPoint, MS Project, MS Teams
Marcus Bonfigt
Last position:
Data Engineer at Deutsche Bahn AG via Scoore GmbH
- Development of ETL pipelines with Talend (7/ Enterprise)
- Development/adaptation of database schema/database functions (PostgreSQL)
- Development of GIT CI pipelines
Technologies: Talend Enterprise, Git, PostgreSQL, Dbeaver, SQL, PL-SQL, Liquibase
Marc Matt
Last position:
Freelance Data Specialist at BrightlySoftware – A Siemens Company
- Migration of customer data from a private cloud to AWS
- Optimizing data transformation jobs and migration from Talend to AWS Glue
- Automation of all migration steps
- Used technologies: AWS, Python, Lambda, CloudFormation, SQLServer, AWS Stepfunctions, Glue, PySpark
Max Dietrich
Last position:
Senior Fullstack Engineer at Spiri.Bo GmbH
- Building new and improving existing features for a housing management platform that helps both landlords and tenants
- Technologies: Node.js, TypeScript, React.js, Next.js, PostgreSQL, Google Cloud, Docker, Kubernetes
Florian Wede
Last position:
Software Engineer at micimo GmbH
- Developing a professional scheduler for organizations with specific detailed requirements
- Evaluating different existing software solutions
- Creating a list of technical requirements
- Implementing these requirements
- Selected technologies: WebDAV, CalDAV, Rust, Baikal, OAuth, Keycloak
Aiman Ragab
Last position:
Test Manager and Test Automation Engineer at Warehouse Management Company
- Introduced test management with SolMan
- Implemented test automation with TOSCA
- Analyzed, created, and automated test cases
- Built regression test portfolio
- Stakeholder meetings and alignments
- Financial management
Discover over 15,000 top freelancers
Statistics of experts using Java
Aggregated from the professional profiles of matched freelancers.
Experience
20 years (Germany: 19 years)
Position duration
2.1 years (Germany: 2.9 years)
Positions per freelancer
14 (Germany: 13)
Top business areas
Information Technology, Product Development, Project Management
Top industries
Information Technology, Banking and Finance, Retail
Certification focus areas
Information Technology, Product Development, Project Management
Bachelor's degree or higher
85% (Germany: 91%)
Master's degree or higher
48% (Germany: 55%)
Doctorate
8% (Germany: 7%)
Certifications per freelancer
2 (Germany: 3)
Most common languages
German, English, French
Speak two or more languages
95% (Germany: 97%)
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 Hamburg 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 Hamburg using Java
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
Java in practice
Java is used to build business software, backend services, integration layers, and large internal systems. It runs on the JVM and is valued for stable code, clear tooling, and a broad ecosystem. Teams also use Java for Android legacy codebases, batch jobs, and high-volume systems.
Typical delivery
- Spring Boot services and APIs
- Java EE / Jakarta EE business applications
- Kafka, REST, and messaging integration
- Testing, refactoring, and maintenance work
- Migration from older Java versions or legacy code
Skills that matter
Strong Java professionals know object-oriented design, concurrency, and clean architecture. They work with Maven or Gradle, JUnit, Git, and common frameworks such as Spring, Hibernate, and Jakarta EE. Good specialists also understand performance, security, and how to keep code easy to maintain.
When companies need help
Companies bring in freelance Java expertise when a system needs rescue, a release is blocked, or a team needs extra capacity. It also helps during platform upgrades, cloud migration, or when a legacy application must be stabilised without slowing the business.
Hamburg projects
In Hamburg, Java often appears in logistics, maritime software, media systems, retail platforms, and enterprise IT. Local teams may want on-site collaboration for sensitive work, but many Java assignments are handled well remotely if communication is clear. English is common in cross-border teams, while German helps with stakeholder contact.
What strong specialists deliver
A reliable Java specialist writes readable code, spots risks early, and keeps systems predictable in production. They should be comfortable with testing, documentation, incident analysis, and working across the full lifecycle from legacy support to new service development. Experience with Java SE, Spring, and the JVM is usually a strong sign of depth.
Frequently asked questions
Key details about Java, drawn from the questions we get asked most.
Java is often chosen for backend services, business applications, integration work, and systems that must stay stable over time. It is also common in large internal tools, batch processing, and API-heavy platforms. Many teams keep using it because the ecosystem around Spring, Jakarta EE, and the JVM is mature.
Java is usually the safer choice when a company needs a proven enterprise stack and a very broad hiring pool of specialists. Kotlin is often used alongside it on the JVM, especially for newer code, while C# is strongest in Microsoft-heavy environments. Go is simpler for some service work, but Java still wins when the project needs deep libraries, tooling, and long-term maintainability.
A strong Java specialist usually brings Spring Boot, Maven or Gradle, JUnit, Git, SQL, and API design skills. Many also need Kafka, Docker, cloud basics, and an understanding of security and observability. For enterprise work, knowledge of Jakarta EE or older Java EE codebases can be very useful.
A Java freelancer can start quickly if the codebase is well documented and the team has clear goals. For legacy systems, the specialist usually needs time to understand business rules, build pipelines, and deployment steps. The more critical the system, the more valuable a short onboarding phase becomes.
Bring in Java expertise when delivery slows down, a migration is risky, or a production issue needs focused attention. Freelancers are also useful when your team needs help with refactoring, test coverage, or a difficult upgrade. They can add capacity without forcing a permanent hire too early.
Yes, Java work is often remote-friendly because most tasks happen in the codebase, build tools, and issue tracker. In Hamburg, some companies prefer on-site time for workshops, security-sensitive systems, or close stakeholder work. A mixed setup usually works well when the specialist communicates clearly and joins key meetings.
Look for clear code, strong test habits, and the ability to explain trade-offs. A good Java specialist should talk confidently about the JVM, Spring, build tooling, debugging, and production support. Past work on similar systems matters more than buzzwords on a profile.
Yes, Java remains a solid choice for new services when a company wants stability, strong tooling, and easy hiring over time. It is especially common in enterprise platforms, integration-heavy systems, and environments that expect long-term support. The key is to use modern Java, a current framework, and a clean architecture.
The average hourly rate of freelancers in Hamburg, Germany who have used Java in their recent projects is 97 €, which corresponds to a daily rate of about 778 € based on an 8-hour working day.
Of the freelancers in Hamburg, Germany who have used Java in their recent projects, 85% hold at least a Bachelor's degree, 48% hold at least a Master's degree, and 8% hold a doctorate.
On average, freelancers in Hamburg, Germany who have used Java in their recent projects have 20 years of professional experience, with a single engagement typically lasting around 2.1 years.
The most common languages among freelancers in Hamburg, Germany who have used Java in their recent projects are German (100%), English (95%), and French (15%).
The most common industries among freelancers in Hamburg, Germany who have used Java in their recent projects are Information Technology (95%), Banking and Finance (49%), and Retail (45%).
The most common business areas among freelancers in Hamburg, Germany who have used Java in their recent projects are Information Technology (100%), Product Development (85%), and Project Management (67%).
Main locations of FRATCH Experts, who have recently used Java
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.
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Stuttgart 
Dusseldorf 
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Dortmund 
Essen 
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Dresden 
Hanover 
Nuremberg Request a free demo
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Philipp Thomaschewski
FRATCH CEO
