Apache Solr Expert in Germany
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Meet FRATCH Experts in Germany, who have recently used Apache Solr
Niko S.
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.
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.
Alexander Z.
Last position:
Senior Data Solutions Engineer at VMware Inc.
- Architected and deployed private cloud data platform on VMware vSphere, integrating Greenplum MPP, Apache Kafka, Kubernetes, and Apache Solr, and developed real-time ingestion pipelines with Kafka Connect and Schema Registry.
- Led Oracle Exadata to Greenplum migration, rearchitected data models, optimized storage, implemented RabbitMQ with Debezium for CDC, and deployed VectorDB for Generative AI.
- Designed and executed multi-cloud migration PoC across AWS, Azure, and GCP, defined KPIs for throughput, latency, and cost efficiency, executed bulk data transfers, validated analytics and streaming workloads, and delivered full-scale architecture recommendations.
- Assessed legacy on-premises infrastructure and designed modern cloud-native data platforms using Greenplum and containerized microservices, advising on scalability, disaster recovery, and high-availability.
Stefan A.
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
Rüdiger S.
Last position:
Full-Stack Software Engineer / Consultant for Digitalization at ARTEVENT
Designed, built, and launched an internal event planning web application used by over 100 department leads for a large event, despite having no dedicated testing phase.
Ensured smooth, failure-free operation during first production use, leading to the tool being adopted for future events.
Automated catering calculations and related workflows, significantly reducing email communication and manual computation effort for meal planning.
Managed deployment and hosting on a Linux server using Coolify, including application setup and runtime operations.
Hired and guided a communication designer on UX while independently owning all technical decisions and implementation.
Christiane N.
Last position:
Management Consultant at Christiane Neher Management Consulting
Large Insurance Company – Consultant Wiesbaden: Consulting support for the introduction of an integrated planning and performance management framework (operational, financial, customer) to enhance customer-centric transparency, decision-making quality, and steering capabilities across all lines of business within an insurance organization:
- Analysis of existing processes, reports, KPIs, and KPI calculation methodologies
- Design and introduction of new, standardized customer KPIs (gross/net), as well as key steering metrics with consistent linkage across all lines of business
- Recalculation, validation, and plausibility checks of KPIs based on existing and newly integrated data sources
- Conceptual support for the development of an integrated reporting and performance management setup
- Execution of customer insights analyses to identify patterns and anomalies within customer data clusters
Large retail company – Consultant in Karlsruhe: Advisory services for the setup and step-by-step implementation of an internationally deployable RELEX solution in the supply chain management environment:
- Advising overall and sub-project management on methodology, project setup and steering (e.g. agile approach, Jira configuration, RELEX phases, Jira Structure PPM)
- Strategic-operational consulting for the introduction of RELEX including best practices
- Support in defining overarching goals and requirements (2-year target picture)
- Guidance in scoping a relevant supply chain network segment for the project
- Development of a roadmap for iterative, incremental RELEX setup and rollout
- Assessment of project dependencies (interfaces, configurations, etc.)
- Advice on prioritized implementation of business requirements and data interfaces
- Support in test planning (data validation, system testing, UAT)
- Consulting on internationalization, change management, training, and knowledge transfer
- Stakeholder advisory and alignment activities between the client, implementation partner, and RELEX
Insurance company – Management Consultant in Munich: Analysis, consulting and support for the optimization of a large-scale business and IT transformation. Focus on strategically important programs and modernization projects in the area of Managed Services Operations and processes:
- Review of project plans and deliverables; analysis of programs and projects (e.g. cloud approach, process standardization, system integration, roadmaps)
- Identification of technical, functional and personnel risks and challenges; development of content-related measures and alternative solutions
- Proposal of quality improvements for program and modernization efforts
- Sparring partner and professional, technical, structural and organizational consulting for project and program management
Large retail group – Management Consultant & Stream Lead in Cologne: Consulting, process, project and product management for the introduction and implementation of a large strategic program in the field of advanced analytics, assortment and space management:
- Setup, test and rollout of a new space planning, automation and optimization product based on the existing cluster-based merchandising approach
- Definition and setup of new processes and transformation and change management measures for the new store-specific merchandising approach
- Collaboration with Advanced Analytics and IT (internal and external) for software implementations, automations, extensions and interfaces
- MVP approach and piloting in phases with gradual rollout (pilot with 80 stores, region with 500 stores, national level with 4000 stores)
Large retail company – Agile Coach & Change Agent in Cologne: Agile coach, OKR master and facilitator for the introduction of the OKR approach in a large strategic digitization program for retail stores:
- Coaching of the core team with topic managers and team leads
- Introduction to the OKR topic and setup of the OKR cycle
- Establishment of the OKR approach in teams and on a cross-team level
Delivery and logistics company – Management Consultant in United Kingdom: Consulting and coaching in the restructuring of the Data Analytics department:
- Analysis of current challenges
- Definition of overarching goals
- Development of a proposal for a new team structure
- Identification of required competencies, skills and responsibilities
- Advisory and alignment on communication and change management strategy
Harald S.
Last position:
IT Product Owner – eCommerce – Mechanical Engineering at Self-employed
- Responsible for further developing the web shop with focus on stability, security, and scalability
- Support the business in creating and evaluating requirements
- Technology: SAP Commerce Cloud, Adobe Experience Manager CMS (AEM), Solr Search, Adyen Payment Service Provider
- Tools: Confluence, Jira, Miro, ServiceNow
Rainer L.
Last position:
Senior IT Consultant, Senior Software Architect, Senior Software Developer, Senior DevOps Engineer at Techniker Krankenkasse
Automation of the database major / minor releases for the TKeasy project
Concept for database major / minor release automation
As-is analysis
Evaluation of Redgate Flyway functionality
Concept creation
Products: Redgate Flyway, GitHub, Quest, Erwin Data Modeller, Oracle, Atlassian Jira, Atlassian Confluence
Skills: Docker, Continuous Delivery, Continuous Integration, Redgate Flyway, Major Releases, Minor Releases
Martin W.
Last position:
Security Auditor at MissionMe
- Environment: AWS, Ruby on Rails, GraphQL, React Native
- Penetration test for Backend, Android-App and iOS-App
Frank B.
Last position:
System Engineer at Frequentis Comsoft
- Migrate company software to RHEL10
- Development in Bash, Python, C, Ansible
Nikunjkumar P.
Last position:
Senior Java Backend Developer at Questax Professionals GmbH
- Provide the Price Listing Service team with prices for all cars and vans in different markets
- Adapt market-specific requirements such as taxes, government subsidies, campaigns
- Import and synchronize new prices for all new and existing cars and store them in the Redis datastore
- Support our product and on-call duty
- Daily business, development of new features, bug fixing
- Pair programming, code review, mob programming
- Develop POCs for new ideas
- Maintain and extend the backend
- DevOps tasks
- Run Kubernetes updates
- Adjust and further develop Kubernetes resources
- Develop and adapt Helm charts
- Adapt and update ArgoCD
- Maintain, adapt, and improve CI/CD
Hicham M.
Last position:
Freelance Software Developer at Buhl Data Service GmbH
- Backend development: .Net 8, C#, PostgreSQL, Entity Framework Core, REST Web APIs, Docker, Kubernetes, Kafka, Open API Swagger, Apache Airflow, Resharper, Git, Microservices, SOAP, gRPC, Hangfire, OAuth 2, GraphQL
- Interface development for document processing with SmartFix, Softexpansion and Natif.ai: C#, REST API, Resharper, Git
- Deployment: Azure DevOps YAML, Vanilla Helmchart, Rancher, Kubernetes Cluster, Linux Docker, Windows VM, Python
- Unit tests and integration tests
- Telemetry, Kibana, Grafana, Elastic Search
- Work in a Kanban team of 8 developers, 1 tester and one Product Owner
Kamel B.
Last position:
Senior TYPO3 Developer at IHK für München und Oberbayern
- Planning and implementing the upgrade of the existing TYPO3 installation to TYPO3 11, including switching to a Composer setup (Composer-based deployment)
- Migrating the underlying MySQL database
Florian F.
Last position:
Senior Backend Developer at ING Deutschland AG
- Database design with Oracle DB, JPA and Flyway considering high performance requirements
- Analysis of multiple architecture drafts and identification of technical risks
- Design and implementation of various interfaces and integrations, especially REST APIs and Kafka topics
- Setup of Elasticsearch for monitoring and analyzing log data
- Establishment of an iterative work approach in the project team facing complex business requirements
Celso K.
Last position:
SAP Commerce Cloud FullStack Developer at Spar
- Implementation of a GitLab CI/CD pipeline based on SAP Commerce Cloud 2211
- Development of a new B2C shop with Vue, Node and TypeScript to ensure scalability, extensibility and performance optimization
- Integration of Microsoft Azure Event Grid with SAP Hybris
- Implementation of BDD with Cucumber using Gherkin syntax to promote collaboration between development and business teams
- Support and customization of a Spartacus shop
- Technologies/Languages: Java, REST, OData, Behavior Driven Development (BDD), Cucumber, Node, Vue, TypeScript, Spartacus, GitLab CI/CD, Gradle, Maven, Ant, SonarQube
Discover over 15,000 top freelancers
Statistics of experts using Apache Solr
Aggregated from the professional profiles of matched freelancers.
Experience
21 years
Position duration
1.9 years
Positions per freelancer
15
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Retail, Banking and Finance
Certification focus areas
Information Technology, Product Development, Project Management
Bachelor's degree or higher
94%
Master's degree or higher
55%
Doctorate
9%
Certifications per freelancer
2
Most common languages
German, English, French
Speak two or more languages
100%
Based on our profile pool as of 19 Sep 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.
Discover detailed Apache Solr rate benchmarks:
Explore rate insightsAverage rates of experts in Germany using Apache Solr
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 19 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
Apache Solr 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 (96%)
- Retail (65%)
- Banking and Finance (53%)
- Media and Entertainment (53%)
- Manufacturing (39%)
- Education (37%)
- Insurance (35%)
- Automotive (33%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
Search technology
Apache Solr is an open-source search platform built on Apache Lucene. It indexes structured and unstructured content, then returns relevant results through configurable queries, filters, facets, sorting, and highlighting. Companies use it when search quality and scale matter across large product, document, or content collections.
What it builds
Solr powers search experiences inside online shops, publishing systems, knowledge bases, portals, and enterprise applications. It can support keyword search, autocomplete, category navigation, recommendations, and location-aware results. Its HTTP APIs make it suitable for browser applications, services, and data workflows.
- Product and catalog search
- Document and intranet search
- Faceted navigation and filtering
- Autocomplete and spell correction
Ecosystem and tooling
Strong specialists work with Solr cores or collections, schemas, analyzers, tokenizers, field types, and request handlers. They also understand SolrCloud, ZooKeeper, replication, sharding, backups, and rolling updates. Common project connections include Java services, REST APIs, JSON, SQL or NoSQL sources, Kafka, Spark, and container orchestration.
When expertise matters
Companies often bring in freelance Solr expertise when search results are slow, inconsistent, or difficult to explain. Specialists help during a migration from legacy search, a move to SolrCloud, a reindexing project, or the launch of a new catalog or content platform. In Germany, remote collaboration is common, while on-site work can support workshops with product, data, and operations teams.
- Relevance tuning and query analysis
- Schema design and indexing pipelines
- SolrCloud capacity and resilience planning
- Upgrades, migrations, and incident support
Delivery and integration
A professional typically starts by examining content structure, search behavior, query logs, and performance targets. Deliverables may include an index model, ingestion jobs, optimized queries, test collections, monitoring dashboards, and runbooks. Reliable integration also requires clear handling of updates, deletes, permissions, language analysis, and failure recovery.
Signs of strong specialists
The best professionals connect search behavior with business intent instead of tuning isolated queries. They can explain why a result ranks highly, measure changes with representative test cases, and protect performance under realistic load. Look for hands-on knowledge of Lucene concepts, analyzers, distributed operations, observability, and the application code surrounding Solr.
Frequently asked questions
Need clarity? These are the questions we hear most often about Apache Solr.
Apache Solr is used to index and search products, documents, articles, customer records, and other structured or unstructured content. It supports relevance ranking, filters, facets, autocomplete, highlighting, and geospatial queries through web-accessible APIs.
Apache Solr and Elasticsearch both build on Apache Lucene and support distributed search, analytics, and JSON-based integration. The better choice depends on the existing ecosystem, operational model, query needs, governance preferences, and the team's experience with each system.
A strong Apache Solr specialist usually understands Lucene indexing, Java services, REST APIs, data ingestion, and query design. Experience with Kafka, SQL or NoSQL systems, containers, Kubernetes, monitoring, and cloud infrastructure is useful when Solr is part of a wider production platform.
The right level depends on the work. A focused schema or query change may suit a specialist familiar with the application, while a SolrCloud migration or relevance redesign calls for proven experience with distributed indexing, recovery, capacity planning, and production troubleshooting.
Apache Solr projects are often suitable for remote collaboration because configuration, code, logs, and search tests can be reviewed online. On-site workshops may still help with discovery and stakeholder alignment, and teams should agree on working language, documentation standards, and access procedures early.
A company may choose Apache Solr when it needs advanced relevance, faceting, autocomplete, highlighting, language analysis, or independent search scaling. A database search feature can be simpler for small, tightly coupled datasets and straightforward lookup requirements.
Ask how the specialist would investigate poor relevance, slow queries, indexing delays, or shard imbalance in Apache Solr. Strong answers connect diagnosis to measurable test queries, explain trade-offs clearly, and cover monitoring, rollback, data consistency, and failure recovery.
Apache Solr uses SolrCloud to distribute collections across nodes and support replication, sharding, and failover. ZooKeeper coordinates cluster state and configuration, so a specialist should understand quorum behavior, recovery, upgrades, and the operational risks of misconfigured nodes.
The average hourly rate of freelancers in Germany who have used Apache Solr in their recent projects is 94 €, which corresponds to a daily rate of about 749 € based on an 8-hour working day.
Of the freelancers in Germany who have used Apache Solr in their recent projects, 94% hold at least a Bachelor's degree, 55% hold at least a Master's degree, and 9% hold a doctorate.
On average, freelancers in Germany who have used Apache Solr in their recent projects have 21 years of professional experience, with a single engagement typically lasting around 1.9 years.
The most common languages among freelancers in Germany who have used Apache Solr in their recent projects are German (100%), English (100%), and French (22%).
The most common industries among freelancers in Germany who have used Apache Solr in their recent projects are Information Technology (96%), Retail (65%), and Banking and Finance (53%).
The most common business areas among freelancers in Germany who have used Apache Solr in their recent projects are Information Technology (100%), Product Development (98%), and Quality Assurance (63%).
Main locations of FRATCH Experts, who have recently used Apache Solr
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 Request a free demo
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FRATCH CEO
