Entity-Relationship Model Experts in Germany
for clear data structures, matched in minutes with vetted professionalsHire experts who turn business rules into precise entities, relationships and database schemas, using ER diagrams, normalization and SQL-ready designs. FRATCH quickly matches you with vetted, available freelancers who fit your project and collaboration needs.
Meet FRATCH Experts in Germany, who have recently used Entity-Relationship Model
Timo H.
Last position:
Software Developer at Smiths Detection
- Extension of a Swing-based UI for recording Security Restricted Articles during baggage screening.
- Introduction of a new workflow for recording Deboarding Events.
- Extension of the reporting system for Security Restricted Articles and Deboarding Events.
- Implementation using JBoss Wildfly, PostgreSQL, spring-boot 3.x, Java 8/21, Swing, JSF, JAX-RS/Resteasy, Docker, Maven, Kiro.
Wolfgang T.
Last position:
Overall Project Manager at itzbund
Project overview: The use of “Generative Pretrained Transformer” (GPT) technologies will greatly change the world of work in the coming years. ITZBund is developing a basic service for this purpose, which can be used by its 200 customers. This basic service is offered both on-premises and in the cloud. Launched in 12/23, production systems (based on the MVP) had already been successfully rolled out and operated for several authorities and federal ministries by 05/24.
Project metrics:
- 2024 budget approx. 20 Mio €
- approx. 70 people directly involved in the project
- regular (indirect) contact with approx. 80 people in the wider project environment
My main responsibilities:
- Overall responsibility as external project manager
- Project definition phase/ Project setup and establishment of the project organization
- Strategic and operational project planning, as well as project design and ongoing adjustments
- Ongoing coordination with the project owner and stakeholders at ITZBund
- Ongoing coordination with sub-project managers, agile roles, and other project team members
- Responsibility for project controlling, quality management, risk management, and change management
- Responsibility for providing the basic service in on-premises and cloud environments and its ongoing development
- Planning and leading several hypercare phases
- Collaboration and ongoing coordination with a federal ministry partner project and delivery of an MVP
- Coordination with the agile teams
- Coordination with operations, release, and deployment
- Responsibility for delivering initial customer projects
- Responsibility for developing AI governance
- Ensuring accessibility (BITV)
- Responsibility for setting up a sub-project for marketing activities
- Support in setting up an efficient proposal process
- Stakeholder management
Approach:
- V-Modell XT ITZBund
- Scrum
Tools used:
- Microsoft Office, Skype, MS Project, Confluence, Jira, Sharepoint, Miro
Manfred P.
Last position:
Senior IT Project Manager EfA / OZG Online Services at Senatskanzlei ITD Hamburg, Dataport, Police Hamburg
The online service "Special Use of Streets and No-Parking Zone" was in a partially completed state. The following tasks had to be carried out to reach final completion:
- Preparation of an expert report on the status of the online service, and recommendations for action
- Ensuring that all LEIKAS to be used are available (service catalog / service descriptions of the authorities)
- Creating and aligning concepts for complex IT projects (business/IT concepts, architecture, interfaces, roadmaps)
- Requirements management
- Multi-project management with 3 stakeholders (Police, Dataport, development company)
- Determining resource needs
- Coordination to identify technical requirements through the IT architects
- Creating use cases and test cases
- Creating action items
- Managing external IT service providers
- Coordination and management of all activities
- Conflict resolution / business mediation
- User Acceptance Test (UAT) and acceptance by Hamburg Police (Traffic Directorate, Policy Department, Central Road Traffic Authority)
Technical environment: .NET, EfA minimum requirements, Leikas, Administrative Procedure Act (VwVfG), HWG (Hamburg Roads Act), Atlassian Jira, Confluence, MS Office
Burhan D.
Last position:
Enterprise Architect & Solution Architect at DB Netz AG
With project PRIZMA, DB will modernize its infrastructure on the one hand, and develop a fail-safe IT landscape on the other hand, which can be restored quickly and securely in case of a disaster.
- Capture current architectures of existing systems as well as methodical consulting and development of target architectures
- Deepen and maintain the building plan / target IT landscape
- Implement technical architecture concepts & architecture descriptions
- Implement migration concepts for updating and further developing the platform and information systems
- Assess submitted improvement suggestions as part of the project
- Capability management: identify capability gaps, develop target visions, and support transformation planning within the enterprise architecture.
- Create a compatibility matrix of the components in use and compare dependencies of specific versions
- Create an IT concept for extending the platform with the following topics: hardware and software requirements, security, licensing, high availability, load balancing, backup & recovery, update strategy, monitoring integration, etc.
- Coordinate with business architects as well as technical architects from the cross-functional architecture area of the PRISMA program for the topics (backup, Active Directory, monitoring, Citrix, and business applications ...)
- Status meetings and alignment of project planning with the Release Train Engineer / Project Manager
- Advise the Release Train Engineer / Project Manager in identifying project risks
- Advise the System Architect Engineers in steering the implementation of the concept
- Implement the IT concept
- Document the infrastructure
Label: MS Project, LINUX, Windows, ORACLE, Java, REST, SharePoint, Microsoft Exchange, UML, Enterprise Architect, BPMN, AZURE, AWS, V-MODEL, Micro Service, VisualStudio, SAP S/4HANA, SCRUM(SAFE), ESB (TIBCO), Python, Innovator, LeanIX (TOGAF), Ansible, Ansible Tower, Ansible Automation, ROBOT, SpringBoot
Birgit S.
Last position:
Business Analyst / Requirements Engineer / Tester at BMW
Topics:
- Further development of the CRM system NKAM and technical separation of “direct” and “indirect” sales
- Redesign of the discount management area and outsourcing to another system.
- Designing numerous improvements on the wholesale side to reduce manual effort down to the level of user stories.
Michael K.
Last position:
Enterprise Architect, Lead Architect of the transformation program and coach at Swiss Ministry
- Development of the overall architecture
- Support for the respective workstreams in developing architectures in the areas of infrastructure, data centers, security, and network topology
- Management of the architect pool
- Support for program management in setting up the transformation project based on agile methods
- Consideration of regulatory requirements for IT projects in the federal administration
David K.
Last position:
IT Business Analyst at REWE digital
LOIS is the central integration platform that enables the processes between all REWE applications across the entire supply chain. As an IT Business Engineer, I support the NEO program in renewing the logistics integration platform "LOIS" for REWE and Penny in Germany and Europe.
Andreas G.
Last position:
Senior Fullstack .NET (Core) & Angular Developer at IT Service Provider
- Supporting several agile teams in the new product development of an enterprise CRM and ERP application
- Web frontend development with Angular 17–21 (microfrontends, Domain-Driven Design, MDB-Bootstrap)
- Backend development with C# and .NET 7–10, MongoDB, MassTransit, RabbitMQ, Entity Framework Core, ElasticSearch (microservices, DDD)
- Technical feature design for assigned tasks
- Technical architecture design including forward-looking planning of AI-supported extension options
- Proof-of-concept implementation of AI-supported workflows with n8n and a locally hosted LLM (Ollama)
- Coordination with stakeholders and Product Owners, support with sprint planning
Result: Delivery of production-ready microservices and frontend modules in agile sprint cycles.
Environment: .NET 7–10 · Angular 17–21 · C# · TypeScript · OpenAPI · Microfrontends · DDD · Kubernetes · Docker · Helm · MS SQL Server · PostgreSQL · MongoDB · MassTransit · RabbitMQ · EF Core · ElasticSearch · Kibana · Azure DevOps · KeyCloak · n8n · Ollama
Mario T.
Last position:
Project Lead/Manager / Consultant at all-BI GmbH
- Establishing the Microsoft Fabric platform with the company as the central data warehouse and reporting system.
- The company migrated several operational systems including D365 to new version. The new data warehouse is based on a Fabric/Power BI architecture with Azure cloud Entra Authentication.
Tasks Performed:
- Full administrative responsibility for the Fabric platform F64 and F32 capacities, as well as two F8 capacities for development and prototyping.
- Integration of Fabric with Microsoft Entra.
- Data modeling for the data warehouse bronze, silver and gold layers using data modeling tools.
- Star Schema as well as entity relationship modeling.
- Data modeling for data marts and for dimensional modeling and Power BI (semantic model).
- Design of data models for Microsoft SSAS multidimensional and tabular OLAP cubes using DAX and MDX.
- Definition of design patterns for the ETL team for loading OLAP cubes (Tabular and MD), star schemas and data vault structures.
- Planning and managing team of 4 ETL and reporting developers.
- Performance Tuning of Power BI reports, particularly the semantic layer, as well as the Fabric notebooks
- SQL Performance Tuning.
- DB Design for Azure SQL.
- Reporting directly to project senior management.
Label: Power BI, Fabric, Analysis Services (multidimensional and tabular), D365, SSIS, Tabular Editor, SQL Server and Azure SQL, TOAD Data Modeler, DBSchema, Visual Studio Code, DAX Studio, SSMS, Visual Studio, Jira and Confluence.
Bernhard S.
Last position:
Agile Business Analyst and Requirements Engineer at Deutsche Post DHL
- Agile project "PEPSi annual vacation planning MVP Lite" (digitalization project).
- Definition of state transitions for the JUP Lite functionality.
- Creation of user stories for login/logout and registration.
- Quality assurance of the business-side concept.
- Preliminary analysis for the transformation from the old PersPlan to DigiPEP.
- Tools used: Signavio, MS Office (Excel, Word, PowerPoint), Jira, Confluence, Mural, Miro, Conceptboard, MS Teams, Mattermost.
Maciej S.
Last position:
Product Owner at Bundesagentur für Arbeit
- As part of the project, the further development of the identity management system was driven forward. This included a comprehensive refactoring of the interfaces to the connected target systems. In addition, several special systems were successfully connected to the IAM to ensure end-to-end identity and authorization management.
- Technical design and solution proposals for IAM system development
- Requirements analysis and requirements management (IREB, BABOK)
- Alignment of the strategy with the future target architecture (TOGAF)
- Prototyping of solutions
- Documentation of requirements (Innovator)
- Analysis and documentation of requirements and creation of process models (UML, BPMN, ArchiMate)
- Modeling of requirements and system functionalities (OOA/OOD, UML)
- Further development of interfaces (SOAP, REST)
- Carrying out architecture reviews
Mathew D.
Last position:
Data Science Expert and AI Strategist at Freelancer
- Built an API to ingest, clean, translate, and index EU tenders documents in Neo4j, enabling hybrid search with RAG and Cypher queries via a Streamlit dashboard
- Deployed the API on AWS Lightsail container services with CI/CD automation via GitHub Actions, ensuring stability through pytest unit and integration tests
- Designed and developed a comprehensive online course on data analysis using ChatGPT for professionals and learners, creating instructional videos and interactive Jupyter notebooks
- Utilized OBS and professional audio equipment to ensure high-quality video and audio content
- Led a CRM data normalization and cleaning project visualized via a Sankey diagram to aid customer understanding and pipeline development
- Implemented and validated a genAI-driven web crawling strategy on AWS, ensuring data quality, scalability, and CRM data augmentation
Rainer D.
Last position:
Enterprise Architecture Management / Backend Software Developer at Polizei Hamburg
- Several projects in a police context
- Model and document police procedures/projects with Archimate (as-is/to-be) in the context of P20 (BKA)
- Create software architectures with microservices
- POC development with Springboot/Docker/Kubernetes
- Project size: 10 people
- Enterprise architecture management with Togaf and Archimate
- Backend software development Springboot
- DevOps with Kubernetes
- Implemented using: Java 17/21, Springboot 3, P20 architecture, Togaf, Archimate
Stefan M.
Last position:
Bundesrechtsanwaltskammer
- Design, planning and execution of complex acceptance tests for a document exchange platform for the German justice authorities.
- Validation of decrypted and certificate-based message exchange via web platform, mobile app, and Java API.
- Documentation of test cases, execution steps, and test results.
- Technologies: Windows 11/10, Ubuntu, iOS, Android, Bash for Windows, Java 17, IntelliJ, Git, Jira, Confluence, Citrix Server, xJustiz standard implementation, specific justice software.
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
Discover over 15,000 top freelancers
Statistics of experts using Entity-Relationship Model
Aggregated from the professional profiles of matched freelancers.
Experience
26 years
Position duration
6.2 years
Positions per freelancer
22
Top business areas
Information Technology, Product Development, Project Management
Top industries
Information Technology, Banking and Finance, Government and Administration
Certification focus areas
Project Management, Information Technology, Quality Assurance
Bachelor's degree or higher
96%
Master's degree or higher
77%
Doctorate
15%
Certifications per freelancer
3
Most common languages
German, English, French
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 Entity-Relationship Model
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.
Entity-Relationship Model 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 (94%)
- Banking and Finance (71%)
- Government and Administration (65%)
- Automotive (47%)
- Transportation (47%)
- Manufacturing (47%)
- Professional Services (47%)
- Insurance (44%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
Data foundations
An Entity-Relationship Model describes the data a business needs and how that data connects. It represents entities such as customers, products or orders, their attributes and the relationships between them. The model becomes a shared basis for database design, application planning and reliable reporting.
From model to schema
Experts translate conceptual models into logical and physical database structures. They define primary and foreign keys, cardinality, optionality and constraints, then map the result to relational tables. The work can produce ER diagrams, data dictionaries, migration plans and SQL-ready schemas.
Methods and tooling
A strong specialist understands Chen notation, crow’s foot notation and normalization, while knowing when denormalization is justified for performance or reporting. Common tools include draw.io, Lucidchart, dbdiagram.io, MySQL Workbench, Microsoft Visio and database-native modelling features.
- Model entities, attributes and relationships
- Resolve duplicate, missing or conflicting data definitions
- Connect conceptual models with SQL and API requirements
Where it matters
Entity-Relationship Models support systems that depend on consistent, traceable data. They are useful for customer platforms, ERP and CRM systems, commerce, finance, healthcare records and analytics warehouses. German companies often need specialists who can work remotely across teams or join workshops on site, with clear English or German communication.
When to bring in an expert
Freelance expertise helps when a new system lacks a dependable data structure, when legacy databases are difficult to change, or when several teams use conflicting definitions. It is also valuable during migrations, mergers, reporting redesigns and application modernization, where early modelling can expose costly assumptions.
- Review an existing schema and identify structural risks
- Prepare a model for a new product or integration
- Validate naming, keys, dependencies and normalization
What quality looks like
The best professionals connect the diagram to real workflows and future change. They ask precise questions about ownership, lifecycle, volume, access and data quality rather than modelling in isolation. Their deliverables are readable, versioned and traceable to requirements, with decisions explained clearly for both technical and business stakeholders.
Frequently asked questions
Quick answers to the questions that come up most around Entity-Relationship Model.
An Entity-Relationship Model defines the information a system stores and the connections between that information. Companies use it to plan relational databases, clarify business rules, support integrations and reduce inconsistent data before implementation begins.
An ER model is an abstract representation of entities, attributes and relationships. A database schema is the implemented structure, including tables, columns, indexes, constraints and vendor-specific details; the model usually guides that implementation.
A freelance Entity-Relationship Model specialist is useful when a new system needs a clear data foundation, a legacy database must be assessed, or several applications need to share consistent definitions. Specialists can also support migrations, reporting changes and integration planning.
A strong ER model professional should understand relational database design, SQL, normalization, data dictionaries and migration risks. Experience with APIs, data warehouses, master data and requirements workshops is also valuable when the model spans multiple systems.
An Entity-Relationship Model remains useful even when the target is a document, graph or key-value database. The model clarifies business entities and dependencies, while the specialist then adapts those concepts to the chosen storage pattern instead of forcing a relational design.
An ER modelling assignment needs experience that matches its scope and risk, not a fixed amount of time. A simple application may need focused modelling and review, while a regulated, integrated or legacy environment calls for a professional who has handled complex data ownership and migration decisions.
Yes, Entity-Relationship Model work is well suited to remote collaboration through shared diagrams, documentation and workshop tools. On-site sessions can help when domain experts need to resolve terminology or ownership questions quickly, especially across German-speaking teams.
A good ER model reflects real business rules, makes ownership clear and avoids unnecessary duplication. Review whether entities and relationships are named consistently, constraints are explicit, edge cases are covered and the design can be translated into a maintainable schema.
The average hourly rate of freelancers in Germany who have used Entity-Relationship Model in their recent projects is 101 €, which corresponds to a daily rate of about 807 € based on an 8-hour working day.
Of the freelancers in Germany who have used Entity-Relationship Model in their recent projects, 96% hold at least a Bachelor's degree, 77% hold at least a Master's degree, and 15% hold a doctorate.
On average, freelancers in Germany who have used Entity-Relationship Model in their recent projects have 26 years of professional experience, with a single engagement typically lasting around 6.2 years.
The most common languages among freelancers in Germany who have used Entity-Relationship Model in their recent projects are German (100%), English (94%), and French (24%).
The most common industries among freelancers in Germany who have used Entity-Relationship Model in their recent projects are Information Technology (94%), Banking and Finance (71%), and Government and Administration (65%).
The most common business areas among freelancers in Germany who have used Entity-Relationship Model in their recent projects are Information Technology (100%), Product Development (82%), and Project Management (74%).
Main locations of FRATCH Experts, who have recently used Entity-Relationship Model
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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