Log4j Experts in Germany
in minutes from over 15,000 CVs with the power of AIHire experts who secure Java logging, tune Apache Log4j configuration, and fix rolling files, appenders, and MDC or NDC trace context. Get fast, precise matching with vetted, available freelancers.
Meet FRATCH Experts in Germany, who have recently used Log4j
Jens Oberender
Last position:
Freelance Java Developer / DevOps Engineer at Unpublished defense company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
Abhiroop Basu
Last position:
Software Engineer III at Foundry Digital
- Developed and deployed microservices in Kotlin and Spring Boot, integrated AWS Secrets Manager to secure credentials and decreased network calls using Spring cache.
- Refactored Kafka consumer using Spring Kafka with semaphore-based backpressure to cap records and keep heap memory stable under spikes; switched to batch upserts to cut down on database invocations; added Testcontainers integration tests for Kafka and database to pave the way for future changes.
- Automated the financial reconciliation workflow in Spring Boot (Kotlin) using Spring Scheduler, transactional boundaries, JPA/Hibernate on MySQL, and Flyway migrations, saving the accounts team 16+ hours per week.
- Designed and dockerized payments end-to-end test framework in Robot (Python) with reusable keyword libraries and profiles; integrated with GitLab CI (JaCoCo XML and HTML reports) to accelerate releases and lift code coverage to 80%.
- Implemented end-to-end observability on Datadog by instrumenting services with Datadog APM, correlating metrics and logs, provisioning dashboards, and creating monitors with burn-rate alerts and anomalies to harden reliability and give stakeholders clear visibility.
Alexander Schulze
Last position:
AI Consultant for AI Voice Bot System at Rudolf Hörmann GmbH & Co.KG
- Consultant for system architecture, AI agents & integration, coach for data & process logic, Graph-RAG approaches, security and data protection.
- On-premise AI solutions with high compliance and performance requirements.
- Architecture decisions, operational setup, strategic prioritization & deployment.
- Technologies: LiveKit JS SDK, LiveKit Agents, Web Audio API, JS, AudioWorklet, Loki, vLLM, Zscaler, Docker, Neo4j, MySQL, Python.
- Models: GPT-OSS 20B, Whisper large v3 turbo, Qwen3-TTS.
Robert Di Marco
Last position:
Software Architect at FinTech / Wealth Management
- Analysis of existing microservice structures and integration into the event-driven architecture
- Design and implementation of prototypes
- Introduction of structured workflows and embedding in a solid testing strategy
- Team: small specialized team (3-5 people) from analysis to implementation readiness
- Documentation of architectural decisions and definition of interfaces
- Integration of the event-driven pipeline into the existing landscape
- Technologies: Kafka, Docker, Microservices, Event-Driven Architecture, Java, Liquibase
Werner Keil
Last position:
Test Coordinator, Designer and Engineer at IBM
- Testing the SekIDP and related components
- Test design, execution and automation, microservices, GitHub Enterprise, Eclipse, Katalon Test Platform, API Testing, Confluence 8, JIRA/Xray, Draw.io, Swagger/OpenAPI, Postman, Docker, Kubernetes, Podman, PuTTY, E-Health, Telematik, Gematik standards, EPA, E-Rezept, sektoraler IDP, encryption, XaDES, PaDES, DICOM, HL7, FHIR, IHE, ICD, SSO, SAML/Shibboleth, OAuth, smartcards, JWT, two factor authentication Android and iOS, Wireshark, BrowserStack, Cypress, gRPC, REST, SOAP, WS-Security, Linux Shell, PowerShell, SSH/SSL, Java, Kotlin, Cordova, Gradle, Groovy, Python, TypeScript
Achille Chimi
Last position:
Backend/Frontend Developer at ITZ-Bund
Development of a microservice application for calculating postings on accounts
Development of backend components with Java or JEE, Quarkus, Kafka, Rest API
Development of the test component with mocking frameworks (Mockito)
Development of integration test components
Creation of OpenAPI specification format
Configuration of CI/CD pipeline
Development of frontend components with React
Design, further development and optimization of system structures
Code review
Java Corretto 21, JEE, Quarkus, Golang
Reactive programming with Spring WebFlux, Project Reactor
Git, Azure DevOps for CI/CD pipeline, YAML, Json Swagger UI, Postman, Rest OpenAPI, Kafka Streams, Kafka Connect, Log4J
Microservices, Jira, Confluence, MySQL, Docker, Kubernetes (deployment via Helm charts)
Spring Security, OAuth 2, JWT, Sonarqube
IntelliJ, Maven, logging framework Splunk, Agile method Scrum, Nexus, Vaadin V24, build tool Vite
React, React.JS, Node.js, Jess/JavaScript, Tailwind CSS, Agile method Scrum, accessibility BITV, Playwright
Dimitri Simon
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
Ales Loncar
Last position:
Senior DevOps Consultant (Freelance) at European Union Agency (via IBM)
- Worked as freelance Senior DevOps Consultant on-site for IBM at a European Union Agency, operating in a highly secure, air-gapped environment managing classified systems.
- Led automation and DevOps initiatives for a large-scale OpenShift platform (>400 nodes), driving deployment efficiency, GitOps adoption, and operational automation using Ansible, Python, and Bash while ensuring compliance with security requirements.
- Spearheaded automation of release and deployment workflows in a private cloud environment hosting 400+ OpenShift nodes, significantly improving deployment speed and reliability.
- Migrated existing playbooks, roles, and templates from Ansible Tower to Ansible Automation Platform (AAP), ensuring full compliance with fully-qualified collection names (FQCN) and preparing custom Execution Environments (EE) for containerized automation.
- Implemented GitOps Agent for AAP Controller Configuration as Code, enabling automated synchronization (CRUD) of Ansible Controller objects based on repository-stored configuration definitions using GitHub webhooks.
- Designed and automated complex multi-step operational workflows including environment cleanup, Helix cluster component re-creation, Kafka topic management, and OpenShift object lifecycle management across ~100 environments.
- Achieved a reduction of multi-day manual operations to under a few hours through automation improvements spanning multiple AAP clusters and OpenShift environments.
- Integrated Ansible Automation Platform with Thycotic (Delinea) Secret Server via lookup plugin to enhance secure credential management in automated processes.
- Managed deployment tasks, platform troubleshooting, and Istio network configurations while adhering to stringent EU PSC security and compliance standards.
- Collaborated with infrastructure and application teams to refine deployment procedures, develop naming conventions, and continuously improve automation coverage in an air-gapped, classified environment.
Matthias Steinmann
Last position:
Senior Security Consultant (freelance) at DVZ M-V
- ISMS and security concept for the Fabasoft e-file according to BSI 200-1/2, among others
- Structural analysis (A.1), modeling (A.3), and baseline protection checks (A.4)
- Preparation for OWASP penetration test, incident response plan, risk analysis
- DevOps Bitbucket, ARC42, IAM with Keycloak/AD, multi-tenant setup, DMS, SOC
- Emergency preparedness concept (BSI 200-4), operations and service concept (BSK), ITSM
Nikunjkumar Parmar
Last position:
Senior Java Backend Developer at Questax Professionals GmbH
- Provide the Price Listing Service Team Price for all cars and vans in different markets
- Adjust market-specific requirements like taxes, government subsidies, campaigns
- Import, synchronize and store new prices for all new and existing cars in Redis datastore
- Support our product and handle on-call duties
- Daily operations, developing new features, bug fixing
- Pair programming, code reviews, mob programming
- Develop POCs for new ideas
- Maintain and extend the backend
- DevOps tasks
- Perform Kubernetes updates
- Adjust and further develop Kubernetes resources
- Develop and customize Helm charts
- Adjust and update ArgoCD
- Maintain, adjust and further develop CI/CD pipelines
Martin Zander
Last position:
Consulting, Design and Development at ivv GmbH
- Design, development and maintenance of a web application as a policy management system based on a JEE backend and a Vaadin-based UI
- Design and development of interfaces
- Integration of databases
- Design and development of unit and integration tests
- Conceptual coordination with the client
- Technologies and methods: JEE, Vaadin, EJB, Innovator, Hibernate, REST, JMS, SQL, MQ, Maven, Selenium, Arquillian, Mockito, JUnit, Log4j, OOA, OOD, Scrum, Kanban, JavaScript, HTML, CSS, Jenkins, Jenkins Pipelines, Git, GitLab, Subversion, Jira, Confluence, DB2, WebLogic
Ioan Dobre
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.
Jamal Baydoun
Last position:
Freelance Software Architect & Developer at IBM Deutschland GmbH / BWI GmbH
- Architecture, design and further development of a hybrid solution consisting of a Java backend with REST API and C# / WPF frontend
- Development of secure, distributed functions for classified message processing, categorization and encryption
- Integration of backend services with document management systems (DMS) for structured file storage
- Planning, setup and continuous optimization of Azure DevOps pipelines for automated deployment and quality assurance of distributed applications in a security-critical environment
- Technical coordination with Bundeswehr project managers and third-party providers of relevant software and interfaces, and documentation of the developed solutions
Robert Malec
Last position:
Backend Developer at Payment Backend
- Integration of partner systems in the payment and credit card environment.
- Development, deployment and monitoring in a large system landscape.
- Use of a variety of client-specific frameworks and tools.
Radovan Reclo
Last position:
Development and Technical Architecture at HDI
Web application for contract changes
Micro-frontend development from scratch to production with reactive forms foundation, responsive web design, validation, multilingual support, accessibility, unit tests and component tests
Technologies: Angular 19-20, Nx, Angular CLI, Native Federation, TypeScript, HTML, SASS, Tailwind CSS, Angular Material, Reactive Forms, RxJS, Signals, PDF-Make, ng-openapi-gen, i18n, JSON Server, REST, JWT, Jest, Playwright, IntelliJ, Git, CI/CD with GitLab, Cloud Foundry, Nginx; Scrum
Discover over 15,000 top freelancers
Statistics of experts using Log4j
Aggregated from the professional profiles of matched freelancers.
Experience
21 years
Position duration
1.4 years
Positions per freelancer
16
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Banking and Finance, Automotive
Certification focus areas
Information Technology, Project Management, Human Resources
Bachelor's degree or higher
80%
Master's degree or higher
53%
Doctorate
7%
Certifications per freelancer
2
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 Log4j
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
What Log4j does
Log4j is the logging framework many Java systems use to record events, errors, and audit trails. It gives teams a standard way to write structured application logs, separate output by level, and send data to files, consoles, or remote targets. Apache Log4j is common in backend services, batch jobs, and integration layers.
Typical work
- Configure logging levels for services and modules
- Set up appenders, layouts, and rolling file policies
- Add MDC or NDC context for request tracing
- Route logs to SIEM, log files, or observability stacks
- Review log output for incident response and audits
Ecosystem and skills
Strong specialists know the Log4j API, configuration files, dependency management, and the difference between Log4j 1.x and Log4j 2. They often work with SLF4J bridges, Java logging, Spring-based services, and containers. Clean log design matters as much as syntax.
When companies bring in help
Teams usually look for freelance expertise when logging is inconsistent, noisy, or hard to search. They also bring in specialists during Java modernization, dependency cleanup, security reviews, or when Apache Log4j needs to be aligned with broader observability tooling. In Germany, this often fits mixed remote work with clear written handover.
What strong specialists deliver
A strong Log4j professional does more than change a config file. They make logs readable, stable, and useful for support teams. Expect clear naming, safe configuration changes, attention to performance, and practical guidance for operations and developers.
Related search terms
People also search for Apache Log4j, Log4j 2, or simply Log4j. These specialists should understand how it fits into Java logging, how it interacts with SLF4J, and how to keep log output consistent across services, environments, and deployment types.
Frequently asked questions
Not sure where to start with Log4j? These answers cover the essentials.
Log4j is used to capture application events, errors, warnings, and audit messages in a structured way. Teams rely on it to make troubleshooting, monitoring, and incident review easier. It is common in services that need clear logs across different environments.
Log4j is a full logging framework, while SLF4J is usually a facade that lets code stay flexible about the underlying logging engine. java.util.logging is built into Java, but many teams prefer Log4j for richer configuration and layout options. The right choice depends on the existing stack and how much control the team needs.
Ask which Log4j version the expert has worked with, how they handle configuration changes, and whether they have experience with SLF4J bridges and Java modernization. It also helps to ask how they approach log structure, security hardening, and deployment handover. Clear answers show practical depth.
A strong Apache Log4j specialist usually knows Java, Maven or Gradle, SLF4J, and container or server deployment basics. Experience with Spring applications, structured logging, and observability tools is also valuable. These skills help the expert keep logs usable in real operations.
Simple configuration work may need only a focused specialist, while migration, security review, or log standardization needs deeper experience. Projects that still touch Log4j 1.x, mixed frameworks, or production incidents benefit from someone who has seen real system constraints. The more critical the system, the more important proven practice becomes.
Yes, most Log4j work can be done remotely because it centers on code, configuration, and review. For teams in Germany, this often works well when logs, environments, and release access are documented clearly. On-site time is mainly useful for workshops, incident support, or cross-team alignment.
Look for someone who can explain log levels, appenders, layouts, and context data in plain words. Good specialists produce cleaner output, fewer duplicate messages, and safer configuration changes. They also understand how logs support support teams, not just the codebase.
Older Log4j setups may be hard to maintain, inconsistent across services, or tied to legacy patterns. Modernization usually aims to improve reliability, make logs easier to search, and align with current Java and observability practices. A good specialist can move the stack forward without breaking production needs.
The average hourly rate of freelancers in Germany who have used Log4j in their recent projects is 90 €, which corresponds to a daily rate of about 717 € based on an 8-hour working day.
Of the freelancers in Germany who have used Log4j in their recent projects, 80% hold at least a Bachelor's degree, 53% hold at least a Master's degree, and 7% hold a doctorate.
On average, freelancers in Germany who have used Log4j in their recent projects have 21 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 Log4j in their recent projects are German (100%), English (100%), and French (18%).
The most common industries among freelancers in Germany who have used Log4j in their recent projects are Information Technology (100%), Banking and Finance (71%), and Automotive (65%).
The most common business areas among freelancers in Germany who have used Log4j in their recent projects are Information Technology (100%), Product Development (94%), and Quality Assurance (76%).
Main locations of FRATCH Experts, who have recently used Log4j
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
Get in touch with the FRATCH team and we will get back to you within 4 hours.
Would you rather directly get in touch?
We always have the time for a call or email!
Philipp Thomaschewski
FRATCH CEO
