Apache Lucene Experts in Germany
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Meet FRATCH Experts in Germany, who have recently used Apache Lucene
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.
Sabahattin K.
Last position:
Sole responsibility (design, development, infrastructure, operations) at Own project busik.ch
- Ride-sharing and bus platform, live and fully functional. Backend with Spring Boot 4.1 on Java 21, PostgreSQL with Flyway, and Testcontainers integration tests. Hosted in my own AWS account (ECS Fargate, ALB, ECR, IAM Least-Privilege) with CI/CD via GitHub Actions and OIDC federation without static credentials. Development fully AI-supported with Claude Code, including custom skills and project-specific memory. Spring Boot · Java 21 · PostgreSQL · Flyway · Docker · AWS ECS/ALB/ECR · CI/CD · GitHub Actions · Claude Code
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.
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
Alexander K.
Last position:
Senior Fullstack Developer at Deutsche Vermögensberatung AG (DVAG)
- Further development and maintenance of a complex sales platform with a focus on digital closing processes, customer portal interactions, and document generation for financial and insurance products
- Development and maintenance of microservices with Spring Boot 3 and Kotlin
- Frontend development with Angular 20 for displaying products, applications, and documents
- Execution of end-to-end tests with Playwright and integration tests with WireMock
- Creation and optimization of Quartz jobs and CronJobs
- Refactoring of the security configuration in a multi-realm Keycloak setup with a custom filter chain, permission evaluator, and factory routing
- Creation of dynamic emails with Thymeleaf
- Extensive error analysis with Application Insights, Log Analytics, and direct SQL debugging
- Introduction of a dynamically controlled security architecture with flexible token handling depending on path and realm
- Stabilization and clear structuring of the closing process for complex product models
- Significantly improved maintainability and readability of the code through modular refactorings
- Higher test stability and depth through combined use of Playwright, WireMock, and integration tests
- Targeted performance optimization through analysis of Hibernate statistics, query tuning, and use of SQL execution plans
- Technologies used: Java 21, Kotlin, Spring Boot 3, Angular, TypeScript, REST API, JSON, Kubernetes, Docker, PostgreSQL, Liquibase, Keycloak, OAuth2, GitHub Actions, Testcontainers, Azure Application Insights, Thymeleaf, Tilt, Microsoft SQL Server
Peter G.
Last position:
Senior Backend Developer at NetCom BW GmbH
- Development of microservices according to the TMF standard
- Adaptation of existing workflows to microservices (PNMGT, RADIUS, WBCI, ACS, VOIP, P2P)
- Migration of communication from RabbitMQ/REST to Kafka
- Development of Camunda processes for billing leased infrastructure
- Implementation of Kafka connectors for billing and inventory data systems
- Automation of the workflow for WBCI preliminary coordination
- Execution of unit and integration tests as well as acceptance tests with the business departments
- Setup of CI/CD pipelines
- Error analysis for support tickets
- Execution of larger refactorings of legacy code to adapt it to new microservices
- Participation in meetings to gather and clarify requirements
- Technologies: Kubernetes, AWS-DevOps, Apache Camel, Debezium, Python, TMF, Confluent, Kafka, OpenAPI, Java 21, Spring Boot, Docker, MapStruct, PostgreSQL, Maven, Camunda, Keycloak
Peter G.
Last position:
Software Developer at Freelancer
- Digitalization in the public sector
- Worked on 4 different projects to date
- Development of a tool for managing municipal data
- Development of a tool for certifications
- Further development of two tools for managing funding
- Creation of functional modules based on .NET
- Creation of SQL queries for reports and documents
- Creation of scripts for data transfers to the FISBOX® database
- Creation of specialist applications using the standard tools of FISBOX
- Development of data models and screen structures
- Implementation with FISBOX
- Development of evaluations with FISBOX
- Development of evaluations with SQL Server Reporting Services
- Participation in requirements gathering and analysis of customer requirements, as well as in the creation of technical concepts
- Creation and further development of technical documentation
- Creation of test cases, execution of developer tests and participation in quality assurance measures
- Technologies: FISBOX, C#, .NET, Visual Studio, MSSQL, SSMS, SSRS, Power BI, TFS, Git, Angular, Blazor
Patrick W.
Last position:
AI Software Engineer at IppenMedia
- Analysis
- Consulting
- Software design
- Development
- Automation
- Testing
- Deployment
- Architecture, development and deployment of various proof-of-concept applications around the integration of current AI interfaces including conversational, realtime voice, images and videos
- Developed best practices for working with agentic systems and AI in practice
- Created code templates
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
Tezcan D.
Last position:
Solution Architect / Project Manager at German Football Association
- Overall responsibility for the project lifecycle from scope definition to completion
- Close collaboration with platform teams, IT leaders, and external service providers
- Application of SAFe principles and structured sprint work
- Creation of a migration roadmap with clear milestones
- Monitoring of the lifecycle: onboarding, repository migration, replication of permissions, and system tests
- Visualization of the architecture with PlantUML and Gliffy as well as documentation in Confluence
- Regular status reports and running knowledge transfer sessions
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
Michael K.
Last position:
DevOps, Linux Administrator, Infrastructure, Security at ERGO / ITErgo
- Installation, planning, maintenance and further development of the server farm in the area of hardware and software
- Migration of live systems with minimized downtime
- Processing tickets and changes in daily business
- Documentation of changes and processes in Confluence
- Test runs in the development environment
- Configuration and administration of Linux systems
- Configuration and administration of backup systems (Dell Networker, DataDomain)
- Administration of the Checkpoint firewall
Cornelius H.
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
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
Discover over 15,000 top freelancers
Statistics of experts using Apache Lucene
Aggregated from the professional profiles of matched freelancers.
Experience
25 years
Position duration
2.5 years
Positions per freelancer
15
Top business areas
Information Technology, Product Development, Project Management
Top industries
Information Technology, Retail, Media and Entertainment
Certification focus areas
Information Technology, Product Development, Project Management
Bachelor's degree or higher
95%
Master's degree or higher
68%
Doctorate
18%
Certifications per freelancer
2
Most common languages
German, English, Spanish
Speak two or more languages
97%
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 Lucene
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 Lucene 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 (50%)
- Media and Entertainment (47%)
- Banking and Finance (43%)
- Professional Services (43%)
- Insurance (37%)
- Transportation (37%)
- Telecommunication (37%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
Core purpose
Apache Lucene is an open-source search library for Java. It provides the indexing and retrieval foundations behind full-text search, filtering, scoring and faceted navigation. Teams use it when search quality, control and predictable performance matter.
Search systems
Lucene powers document search in ecommerce catalogs, enterprise knowledge bases, media libraries, travel products and applications with large content collections. It supports analyzers, tokenization, stemming, inverted indexes, relevance scoring and configurable query parsing. A Lucene specialist can shape both the search behavior and the data model behind it.
Ecosystem and tooling
Lucene is closely associated with Apache Solr and forms a core part of Elasticsearch, although each product adds its own APIs and operational model. Useful expertise often includes Java, Maven or Gradle, REST interfaces, JSON-based query design and observability. Specialists may also work with:
- Custom analyzers, token filters and synonyms
- Solr cores, schemas and query handlers
- Elasticsearch mappings and Lucene-backed indexes
- Relevance tests, profiling and index maintenance
When to bring expertise
Companies usually need freelance support when search results are hard to tune, indexing slows down or a migration changes query behavior. They may also need a specialist to introduce autocomplete, multilingual search, highlighting, permissions-aware retrieval or faceted navigation. In Germany, remote collaboration can work well when requirements, sample queries and access to test data are clearly documented.
Typical deliverables
A professional working with Lucene can assess an existing index, define an analysis chain and create a relevance baseline. Deliverables may include query implementations, schema or mapping changes, ingestion pipelines, performance findings and repeatable search tests. Strong work connects technical choices to the language, content structure and user intent in the product.
Quality signals
Look for experience diagnosing scoring rather than only configuring a search server. A strong specialist explains how analyzers affect recall, how index design affects latency and how changes will be validated with representative queries. They should also understand version compatibility, zero-downtime reindexing, monitoring and the security boundaries around indexed content.
Frequently asked questions
What clients ask us most about Apache Lucene — answered in short.
Apache Lucene is a Java library for building search and information-retrieval features. It handles indexing, text analysis, query execution, scoring, highlighting and facets, so companies can create search for catalogs, documents, websites and internal knowledge.
Apache Lucene is the underlying search library, while Solr and Elasticsearch provide distributed products and service interfaces built around Lucene. A freelancer can help decide whether direct library control, Solr's configurable search server or Elasticsearch's broader data and API model fits the system.
Lucene work commonly requires strong Java skills and knowledge of text analysis, query parsing, data ingestion and distributed systems. Depending on the project, useful adjacent experience includes Apache Solr, Elasticsearch, REST APIs, cloud infrastructure, observability and relevance evaluation.
Apache Lucene projects need a specialist who understands the consequences of analyzers, index structure and scoring, not just the API surface. The right level depends on the task: a focused query change differs from a migration, multilingual search design or high-volume indexing investigation.
Apache Lucene projects are often suitable for remote collaboration because search behavior can be reviewed through schemas, sample documents and query cases. Teams in Germany should agree on communication language, data access, deployment boundaries and a shared process for testing relevance changes.
Apache Lucene quality should be judged with representative queries, expected results and measurable checks for relevance, latency and index freshness. Ask the specialist to explain analyzer choices, scoring behavior, failure cases and how reindexing or rollback would be handled.
Lucene can suit a product that needs embedded search, fine-grained Java control or a compact deployment model. Solr or Elasticsearch may be more practical when teams need distributed operations, ready-made APIs, cluster management and features beyond the core library.
Apache Lucene specialists should clarify the document structure, languages, query patterns, freshness requirements and security model before changing an index. They should also confirm the Lucene-related product and version, because APIs, defaults and compatibility constraints can affect the implementation.
The average hourly rate of freelancers in Germany who have used Apache Lucene in their recent projects is 102 €, which corresponds to a daily rate of about 817 € based on an 8-hour working day.
Of the freelancers in Germany who have used Apache Lucene in their recent projects, 95% hold at least a Bachelor's degree, 68% hold at least a Master's degree, and 18% hold a doctorate.
On average, freelancers in Germany who have used Apache Lucene in their recent projects have 25 years of professional experience, with a single engagement typically lasting around 2.5 years.
The most common languages among freelancers in Germany who have used Apache Lucene in their recent projects are German (97%), English (97%), and Spanish (13%).
The most common industries among freelancers in Germany who have used Apache Lucene in their recent projects are Information Technology (100%), Retail (50%), and Media and Entertainment (47%).
The most common business areas among freelancers in Germany who have used Apache Lucene in their recent projects are Information Technology (100%), Product Development (97%), and Project Management (73%).
Main locations of FRATCH Experts, who have recently used Apache Lucene
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 
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