Apache POI Experts in Germany
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Meet FRATCH Experts in Germany, who have recently used Apache POI
Ornel Franck Wora Yeno
Last position:
Purchasing Manager, Logistics & IT Manager at Onlinehandler
Proactive support of management in business field development & innovation management
New development of a suite of business applications for analyzing valuation, P&L, and market price risk data
Automation of all internal and external business and work processes
Development of AI-based and AI-supported ETL processes as well as data analysis
Business use-case development
Business and work process optimization
Enterprise architecture management
Sales data analysis and forecasting as well as capture
Inventory management & reordering
Supplier management and communication
Customs processing & clearance
Shipping handling & warehouse coordination
Interface management
Technologies used: Microsoft Office 365, Microsoft Teams, JTL-Wawi, JTL-WMS, OTTO Partner Connect (OPC), Amazon Seller Central, DHL Global Forwarding, Jira, Draw.IO, Java (8,17,21,25), Jenkins, SonarQube, Git, Gitea, Spring Boot, Spring Batch, Vaadin, H2, PostgreSQL, Docker, Local LLMs, Postman, JasperSoft Studio, JasperReports
Fred Hauschel
Last position:
Software Architect and Developer at Personal project
A recurring problem in my own AI-supported projects: requirements analysis, use cases, and architecture decisions can be created quickly with AI support, but they remain hard to trace and 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 continuously linked knowledge graph, traceable from the requirement to the architecture decision – queryable for both people and AI agents alike. Technically based on RDF/OWL and its own MCP server.
Result: MCP daemon running, Docker image automatically published on GHCR, nine hexagonal modules, eleven ADRs (including an open-core licensing model). Requirements engineering and ubiquitous language hexagon active. Publicly available 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
Ramazan Cinardere
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
Adem Susam
Last position:
IT Consultant (Test Manager) & CEO at Trikolon Consulting GmbH
- Development and implementation of test concepts for complex, multi-layered systems
- Creation of regular management reports and presentations for stakeholders and clients
- Technical and disciplinary leadership of international test teams (coordination, coaching, resource planning)
- Responsibility for quality assurance across multiple test levels (unit, integration, system, and acceptance tests)
- Design of test cases and test plans in Azure DevOps; ensuring traceability and coverage
- Use of BDD approaches (Gherkin/Cucumber) to prepare test automation
- Building a test automation architecture with Playwright and integrating new tests into CI/CD pipelines
- Performing API tests (REST) and tests for mobile/PWA applications
- Setup and maintenance of test environments across multiple stages (integration, QA, UAT, pre-production)
- Test data management (synthetic and production-like data), ensuring consistency and reproducibility
- Collaboration with DevOps teams for containerization (Docker/OpenShift) and CI/CD integration
- Working under SAFe & Scrum, closely coordinating with product owners and DevOps teams
- Active participation in PI plannings, sprint reviews, and retrospectives
- Promoting an agile QA culture through coaching and knowledge sharing
- Introducing scalable test automation with Playwright → significant reduction of manual testing efforts
- Increasing test transparency through clean defect and reporting management in Azure DevOps
- Improved release quality through an end-to-end QA strategy and automated regression tests
- Strategic leadership of Trikolon Consulting GmbH and responsibility for finance, personnel, and business development
Fabio Fabrizio
Last position:
Senior Software Developer Backend/Frontend at Logistikunternehmen Bremerhaven
- Designed and implemented a slot management system for efficient control of truck arrivals and reducing wait times in logistics operations
- Requirements analysis
- Designed and developed a frontend with React
- Backend development with Spring Boot / JPA
- Designed and implemented REST APIs with Spring Boot OpenAPI
- Technologies: Spring Boot, React, Java, JUnit, Mockito, IBM Db2, SQL, Maven, JPA, Docker, Kafka, SOAP, REST, Git, XML, HTML, CSS, JSON, OpenAPI, Stoplight, Jenkins, WebSphere Application Server, Freemarker, IntelliJ
- Methodology: Scrum, Clean Code
- Team size: 5
Benjamin Schaich
Last position:
Design and implementation of a new cloud service at Porsche AG
- Design of a new cloud service
- Requirements Engineering
- API Design (REST API, Kafka)
- Consulting on architecture, feasibility and effort estimation
- Implementation of a microservice architecture
- Implementation of a Spring Boot web service
- Development of REST APIs including business and persistence logic
- Kafka consumers and producers
- Various Excel upload/download scenarios
- Change Data Capture
- Cloud provisioning with IaC/Terraform
- Go-live with 30,000 users
- Operation, support and bug fixing for other services
Environment/tools: GitLab, JIRA, Confluence, IntelliJ, Spring Boot, Java, Docker, Terraform, AWS ECS, Postgres, Apache Kafka, SAP Datasphere, JUnit, Debezium, Apache POI, Hibernate, JPA, Testcontainers
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
Awais Anwar
Last position:
Senior Java Full Stack Developer at Media Consult Maier + Partner GmbH
- Built AI chatbots with Langchain4j/OpenAI: deployed RAG + function calling using GPT-4 Turbo LLM for medical Q&A enabling context-aware conversation for 5K+ users.
- Boosted LLM accuracy by 40% using RAG with Milvus vector DB, reducing hallucination in medical chatbots response.
- Built asynchronous functions in Liferay modules to track and analyze external site traffic and application submissions; optimized database performance through API-driven enhancements.
- Customized and maintained Liferay platform using Java (backend) and JavaScript, HTML, and CSS (frontend); generated custom themes, APIs, and modules to enhance functionality and user experience.
- Led the Liferay upgrade from 6.2 to 7.4, managing database migration and UI/UX modernization with Velocity, FreeMarker, JavaScript, and CSS; reduced page load time by 30% post-migration using caching.
- Utilized Liferay Service Builder with Hibernate to design and optimize databases, ensuring seamless data integration and robust backend architecture.
- Constructed RESTful APIs for job advertisement resources, enabled asynchronous frontend-backend communication, and imported JSON data into Liferay using Jsoup parsing techniques.
- Scheduled and automated data processing, system optimization, and file handling in Liferay Document Library; created interactive visualizations with D3.js for data insights.
- Managed OSGi builds and integrated external libraries like Apache POI and Langchain4j for scalability; handled server maintenance, portal installations, and platform optimization to ensure system reliability.
- Automated PDF and Excel processing using Apache POI for structured data storage; engineered web crawlers to extract and produced PDF files using ItextPdf to integrate job ads from external portals into Liferay’s database.
Sven Hasselbach
Last position:
Contract Management Workflow Application
- Architecture, review, consultation and development of a contract management workflow application
- Development of a JSF-based platform (XPages) for coordinating new products from partners' initial ideas to contract execution with clients
- Generation of contract documents based on the agreements reached
- Implementation of workflows with approval processes
- Use of Lotus Notes, Java, JSF, XPages, JavaScript, REST, Apache POI, PDF Box, Bootstrap, Selenium, JUnit and Swagger
- Development on Windows and Linux platforms
Henning Petersen
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.
Johan Bouduin
Last position:
(Agile) Coach / Trainer / Software Engineer at Der e-coach
Discover over 15,000 top freelancers
Statistics of experts using Apache POI
Aggregated from the professional profiles of matched freelancers.
Experience
19 years
Position duration
1.8 years
Positions per freelancer
17
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Education, Banking and Finance
Certification focus areas
Information Technology, Project Management, Product Development
Bachelor's degree or higher
100%
Master's degree or higher
38%
Doctorate
13%
Certifications per freelancer
4
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 Apache POI
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
File automation
Apache POI is a Java library for working with Microsoft Office files. Teams use it to create, read, update, and validate spreadsheets, documents, and presentation files in batch jobs, back-office tools, and custom business systems.
Where it fits
It is common in systems that move data between Java services and office files.
- Excel import and export
- Document generation from templates
- Report building for internal users
- Data checks on uploaded files
- Office file migration and cleanup
Core stack
Strong Apache POI specialists know the differences between HSSF for older .xls files, XSSF for .xlsx files, and SXSSF for large sheets. They also understand formatting, formulas, styles, shared strings, and how POI behaves with memory-heavy workbooks.
Why companies hire help
Companies often bring in freelance experts when file handling is slow, fragile, or hard to maintain. Typical cases include broken imports, incorrect formulas, template-driven output, large workbooks, and Java services that need reliable Office document support.
What good experts do
Good professionals write clean code around parsing, validation, and exception handling. They know how to protect file integrity, keep memory use under control, and avoid common issues such as corrupted sheets, lost styles, and formula edge cases.
Germany projects
In Germany, Apache POI work often sits inside enterprise Java systems, shared reporting tools, and internal document workflows. Teams may prefer local language coordination, but remote collaboration is common when the requirements and sample files are clear.
Frequently asked questions
The facts hiring teams ask for most often when it comes to Apache POI.
Apache POI is used to work with Microsoft Office files from Java. It helps teams generate Excel reports, read uploads, fill Word templates, and handle PowerPoint content in automated workflows. It is a practical choice when office documents are part of a business process, not just a one-off export.
A company should hire a Apache POI specialist when file handling becomes hard to maintain or starts breaking in production. Common triggers are complex spreadsheet imports, large workbook exports, template-based documents, and formula or formatting issues. A specialist can usually spot whether the problem is in the data model, the sheet structure, or the POI code itself.
Apache POI is broader and more flexible than many lightweight Excel libraries. It is often the better fit when you need both reading and writing, support for older and newer Office formats, or tighter control over formatting and formulas. Simpler tools can be fine for basic exports, but they usually offer less control.
A Apache POI freelancer should know the main Office formats it supports and the common subprojects behind them. In practice that means working with .xls and .xlsx files, plus Word and PowerPoint documents when the project needs them. It also helps to understand HSSF, XSSF, and SXSSF, especially for large spreadsheets.
A strong Apache POI expert usually brings solid Java, data validation, and backend integration skills. They should be comfortable with streaming, memory management, date and number formatting, and the business rules behind the file content. SQL, REST services, and template design are also common in real projects.
A Apache POI project does not always need a long engagement, but it does need the right depth. Basic exports are straightforward, while reliable import logic, large files, and complex templates need someone who has handled edge cases before. If production data is involved, experienced review is worth it.
Yes, Apache POI work is often well suited to remote collaboration in Germany. The important inputs are sample files, expected output, and clear business rules, which can be reviewed online without much friction. On-site time only becomes useful when teams need close work on legacy document flows or sensitive internal data.
Look for a Apache POI professional who asks about file structure, edge cases, and output expectations before coding. Good signs are clean handling of missing cells, consistent formatting, stable template logic, and awareness of memory limits on large workbooks. The best experts also show how they test with real sample files, not just happy-path examples.
The average hourly rate of freelancers in Germany who have used Apache POI in their recent projects is 110 €, which corresponds to a daily rate of about 876 € based on an 8-hour working day.
Of the freelancers in Germany who have used Apache POI in their recent projects, 100% hold at least a Bachelor's degree, 38% hold at least a Master's degree, and 13% hold a doctorate.
On average, freelancers in Germany who have used Apache POI in their recent projects have 19 years of professional experience, with a single engagement typically lasting around 1.8 years.
The most common languages among freelancers in Germany who have used Apache POI in their recent projects are German (100%), English (100%), and French (36%).
The most common industries among freelancers in Germany who have used Apache POI in their recent projects are Information Technology (100%), Education (64%), and Banking and Finance (55%).
The most common business areas among freelancers in Germany who have used Apache POI in their recent projects are Information Technology (100%), Product Development (100%), and Quality Assurance (82%).
Main locations of FRATCH Experts, who have recently used Apache POI
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
