Apache Sling Experts in Germany
matched in minutes from over 15,000 CVsHire experts who deliver resource-oriented web applications, scalable content services and Adobe Experience Manager integrations with Apache Sling. FRATCH matches you quickly and precisely with vetted, available freelancers.
Meet FRATCH Experts in Germany, who have recently used Apache Sling
Christoph T.
Last position:
Backend Software Developer (Java) at German Football Association (DFB) e. V.
- Client: Prime Force Group GmbH
Technologies used: Java 25, Spring Boot 4, MapStruct, JSpecify, PostgreSQL, Redis, Liquibase, REST/OpenAPI, Apache Kafka, Apache Solr, OpenID Connect via IronGate/Keycloak, SAP Customer Data Cloud, JUnit, Testcontainers, Karate, Playwright, GitLab monorepo with CI/CD, Jenkins, JFrog Artifactory, FluxCD, Docker, Kubernetes on Azure, OpenTelemetry, arc42, Jira, Confluence
The Team Management Center is the new central platform of the DFB for planning, managing, and carrying out team activities for the national teams - from squad selection and training camps to communication with players, clubs, and legal guardians. The platform is designed for multi-tenancy for the DFB and regional associations; player, club, and master data are intentionally not copied, but connected at runtime via the DFBnet APIs.
I have been involved in the project continuously since the architecture and concept phase (Sprint 0) and work in a distributed Scrum team in two-week sprints. In addition to implementation, my focus is on architecture alignment, connecting the DFBnet interfaces, as well as code reviews and test automation as quality assurance in the team.
Focus areas:
- Development and implementation of the multi-tenancy concept (tenant model for the DFB and regional associations), including data model, access layer, and Liquibase migrations.
- Design of the person service and the search concept based on Apache Solr.
- Integration of the DFBnet APIs (player, person, and club search, club data), including authentication and synchronous master data synchronization.
- Hardening the integration through resilience patterns: separate read timeouts for each search path, correction of circuit breaker counting, limiting parallel requests, and a club cache to reduce load on the external system.
- Development of self-service endpoints for players (own activities, activity details, games), including an access concept for participants, as well as person documents and file uploads.
- Standardization of API design: OpenAPI annotations, nullability model via a custom ModelConverter, JSpecify migration of the DTOs, and documented API guidelines.
- Build and maintenance of Karate-based API and integration tests, integration tests with Testcontainers, test guidelines, and bug triage from the integration and reference environments.
- Code reviews via merge requests, architecture documentation according to arc42, and architecture decisions (ADRs) in Confluence.
- Automated deployment to the integration and reference environments, analysis of login and OIDC issues in combination with IronGate.
Status: ongoing - as of 08/2026 in Sprint 17, around 940 person hours worked; testable delivery to the integration environment every two weeks.
Siegfried-Thor B.
Last position:
Independent AI Risk Auditor & Software Architecture Reviewer at Confidential Client
Conducted an independent technical assessment of an AI-enabled software platform, combining AI risk auditing, cybersecurity analysis and software architecture review. Reviewed application components, APIs, data flows, LLM integrations, retrieval-augmented generation, multi-agent orchestration, authentication, tenant isolation, dependency vulnerabilities, AI governance and model lifecycle controls. Authored a technical audit report with a structured risk register, source-code evidence, regulatory references, corrective actions, AI system inventory, risk classification, remediation roadmap and Key Risk Indicators.
Technologies: TypeScript, JavaScript, React, Next.js, Node.js, REST APIs, MongoDB, Redis, AWS serverless services, OAuth 2.0 / OpenID Connect, LLM APIs, RAG, vector search, multi-agent orchestration, Model Context Protocol, C4 architecture modelling, threat modelling, NIST AI RMF, ISO/IEC 42001, ISO/IEC 23894, OWASP guidance, MITRE ATLAS
Frank M.
Last position:
AEM Solution Architect at NetJets
- Advising NetJets across AEM Assets, AEM Sites and Dynamic Media as Enterprise DAM, Solution Architect and Lead Consultant.
- Translating business requirements into scalable DAM solutions by defining metadata models, taxonomy concepts, governance and archiving.
- Documenting business requirements in Confluence and creating Jira user stories for implementation.
- Designing and configuring Dynamic Media following best practices and integrating it into AEM Assets as a Cloud Service and AEM Sites.
- Supporting the B2B QSPartners Sites GoLive through code reviews and targeted optimizations.
- Implementing new AEM features end to end including backend OSGi services, Sling Models, component enhancements and UI customizations.
- Defining and implementing new metadata models, tagging structures, analytics integration points, and asset governance across the platform.
Louis N.
Last position:
Specialist in Adobe Experience Manager & Microservices at Nguenkam Consulting & Engineering
Java 11/21
Springboot
Swagger/OpenApi
Azure Pipelines
Trivy Integration
Apache Sling
OSGI
Java Content Repository (JCR)
Apache Jackrabbit Oak
Adobe HTL
GraphQL
Maven
GitLab
IntelliJ
Azure Cloud
Azure DevOps
Terraform
AEM specialist in the Scrum team
Development and deployment of microservices via Open API interfaces
Operation of microservices in the Azure Cloud
Implementation of AEM modules and integration with microservices
Member of the knowledge transfer team and a backend coordination team
Vikas C.
Last position:
Technical Specialist at HCLTech
- Project: Henkel Adhesives
- Developed and maintained multilingual websites using AEMaaCS (Adobe Experience Manager as a Cloud Service), creating custom components, templates, and workflows to support global brand requirements
- Experienced in managing and delivering engaging learning experiences using Adobe Learning Manager
- Optimized website performance and responsiveness across multiple markets and devices
- Project: AkzoNobel
- Rolled out 8 brand and market websites using the MSM architecture
- Developed comprehensive technical design documents to address complex business requirements
- Designed and developed new modules in AEM/Spring code developing website portals with best practices
Nibedita N.
Last position:
Technical Consultant at Adobe Systems India Pvt. Ltd.
- Implemented AJO (Adobe Journey Optimizer)-AEP (Adobe Experience Platform) integration with AEM for an Australian Govt. project which has a significant business impact in terms of how AEP manages the customer data and engages the customer with AJO driven push notifications, Email etc.
- Developed a POC to integrate AEM-FTP and set up monitoring alert by Sling Job.
- Implemented Groovy scripts which help to modify the JCR nodes without touching the core code.
- Developed and optimized pipeline code for DEV deployment using Bitbucket. Enhanced security by modifying the pipeline to utilize repository variables from Bitbucket, effectively replacing all sensitive hardcoded values within the code repository.
- Implemented complex components such as Listicle component which dynamically fetch and display content from the experience fragments and leveraged sling model, services to streamline the integration process and created custom dialog validation for components which help me brush up my front-end knowledge as well.
- Created MCP tool for deleting old packages in higher environments e.g. UAT, stage as part of maintenance task.
- Implemented custom rollout configuration for a component which gets populated by experience fragments for all locales.
- Developed a custom solution where sitemap reads custom GWS URLs from the ACS commons list.
- Consistently created JUnit test classes as part of my day-to-day activity to increase code coverage for the entire code base.
- Explored on useful tools like Bulk Template/component updater tool, Content Sync tool (which can sync content from higher environment to local without creating any package) etc. and brought them to the team’s attention by documenting and providing demos on them.
- Gained limited experience on OneTrust, Lionbridge interface for AEM related cookie and translation tasks.
- Actively supported the team members in a cross-functional team and regularly participated to meet the code quality standards.
Discover over 15,000 top freelancers
Statistics of experts using Apache Sling
Aggregated from the professional profiles of matched freelancers.
Experience
18 years
Position duration
1.5 years
Positions per freelancer
19
Top business areas
Information Technology, Product Development, Marketing
Top industries
Information Technology, Retail, Education
Certification focus areas
Information Technology, Product Development, Marketing
Bachelor's degree or higher
100%
Master's degree or higher
33%
Certifications per freelancer
3
Most common languages
English, German, French
Speak two or more languages
67%
Based on our profile pool as of 29 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 Apache Sling
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 29 Oct 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
Apache Sling 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%)
- Retail (67%)
- Education (50%)
- Banking and Finance (50%)
- Manufacturing (50%)
- Government and Administration (50%)
- Telecommunication (50%)
- Aerospace and Defense (33%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
Resource-oriented foundation
Apache Sling is an open-source web framework from the Apache Software Foundation. It represents content and application data as resources, then resolves requests through resource types, scripts and services. This model supports modular Java applications that expose content through clean, adaptable URLs.
Content applications
Teams use Sling to create content platforms, editorial applications, digital experiences and headless delivery services. It is a core foundation of Adobe Experience Manager, where content authors work with structured resources and reusable components. Sling also fits custom portals and internal systems that need flexible content access.
OSGi and tooling
Sling applications commonly run on OSGi, with bundles that can be installed, configured and replaced independently. Strong specialists work with the Apache Felix runtime, Sling Models, servlets, filters, schedulers, event handlers and the Java Content Repository. They also understand Maven builds, automated tests, HTTP APIs and deployment pipelines.
When expertise matters
- A team is extending or refactoring an Adobe Experience Manager solution
- Custom Sling Models, servlets or resource providers are needed
- Content must be exposed through reusable APIs or headless services
- OSGi configuration, bundle resolution or request processing is unstable
- A legacy content application needs a safer migration path
Freelance expertise is useful when delivery speed matters or when a team needs focused knowledge of Sling internals without adding permanent capacity.
Germany delivery context
Companies in Germany use Sling-based systems for public websites, commerce experiences, publishing workflows and enterprise content services. Remote collaboration usually works well when repositories, environments and editorial requirements are clearly documented. On-site workshops can help when several business teams must align on content models or migration decisions.
What strong specialists bring
A strong professional traces a request from URL resolution through resource adaptation, script selection and service execution. They design clean resource structures, keep OSGi services maintainable and test behavior across author and publish environments. They also separate Sling concerns from Adobe Experience Manager-specific features, explain trade-offs clearly and leave useful documentation for the team.
Frequently asked questions
The facts hiring teams ask for most often when it comes to Apache Sling.
Apache Sling is used to build resource-oriented web applications and content services on Java and OSGi. It is widely associated with Adobe Experience Manager, but teams can also use Sling for custom websites, portals, APIs and structured content delivery.
Apache Sling centers application behavior on resources, request resolution and OSGi services. Spring Boot offers a broader application framework with a different configuration and dependency model, so the better choice depends on whether the project needs Sling’s content-centric runtime or a general-purpose Java stack.
An Apache Sling specialist should usually understand Java, OSGi, Apache Felix, Maven and the Java Content Repository. For Adobe Experience Manager work, knowledge of Sling Models, HTL, editable templates, dispatcher caching, replication and Cloud Service practices is also valuable.
The right Apache Sling professional should have delivered systems comparable to the assignment, especially where request resolution, OSGi configuration or content migration is involved. A smaller feature may need focused Sling knowledge, while platform changes require someone who can review architecture, deployment behavior and author-to-publish workflows.
Yes. Apache Sling work is often suitable for remote collaboration when source control, environments, access rights and editorial processes are documented. On-site sessions in Germany can still help with discovery workshops, migration planning and coordination between content, product and technical teams.
Ask an Apache Sling specialist to explain resource resolution, resource types, Sling Models and OSGi service lifecycles using a relevant project example. Strong professionals discuss testing, caching, deployment risks and maintainability rather than focusing only on making a component render.
Apache Sling is an open-source framework and runtime, while Adobe Experience Manager is a broader enterprise content platform built partly on Sling. A professional may know both, but experience with AEM does not automatically prove deep knowledge of Sling internals.
Before joining an Apache Sling project, a freelancer should clarify the runtime version, OSGi setup, repository structure, deployment model and whether Adobe Experience Manager is involved. They should also understand the expected deliverables, test environments, publishing workflow and ownership of technical documentation.
The average hourly rate of freelancers in Germany who have used Apache Sling in their recent projects is 78 €, which corresponds to a daily rate of about 626 € based on an 8-hour working day.
Of the freelancers in Germany who have used Apache Sling in their recent projects, 100% hold at least a Bachelor's degree and 33% hold at least a Master's degree.
On average, freelancers in Germany who have used Apache Sling in their recent projects have 18 years of professional experience, with a single engagement typically lasting around 1.5 years.
The most common languages among freelancers in Germany who have used Apache Sling in their recent projects are English (100%), German (67%), and French (33%).
The most common industries among freelancers in Germany who have used Apache Sling in their recent projects are Information Technology (100%), Retail (67%), and Education (50%).
The most common business areas among freelancers in Germany who have used Apache Sling in their recent projects are Information Technology (100%), Product Development (100%), and Marketing (67%).
Main locations of FRATCH Experts, who have recently used Apache Sling
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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