Entity-Relationship Model Experts in Germany
for clear, reliable data structures, matched in minutesHire experts who turn business rules into clear conceptual, logical and physical data models, with strong command of ER diagrams, relational databases and SQL. FRATCH finds precise matches with vetted, available freelancers quickly.
Meet FRATCH Experts in Germany, who have recently used Entity-Relationship Model
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
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
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
Birgit S.
Last position:
Business Analysis, Requirements Engineer at BMW
Refinement of epics and user stories to achieve a higher degree of automation in CRM usage. Testing of new Discountsystem
Dirk Markus M.
Last position:
Scientific Software Consulting Engineer
Technical audit for scientific software.
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.
Stephan H.
Last position:
Development, Tester at Telecommunications
Set up an operational contract information system. This is mainly used as an order management system - for migrating existing contracts as well as for creating and providing new contract bundles.
Sales agents can use it to order new services, modify existing ones and migrate service types, as well as provide price information to the customer.
This supports the marketing of new services as well as the replacement of old services for existing customers.
In addition, existing data is imported, processed (ETL) and provided via services for further use in the portal front end.
Analysis of the business and technical use cases (workflows, involved processes/systems, communication paths, security requirements)
Further development / creation of the front-end components (React/JavaScript)
Design and implementation of the business logic
Creation of the functional and technical component documentation
Test execution / test automation (Cypress, test coverage)
Team size: 8 people
Technologies: React, JavaScript, Rest (JSon), Yaml, Markdown, MariaDB (SQL), Docker, Swagger, Cypress
Tools: Webstorm, ReactDeveloperTools, VisualStudioCode, Word, DBeaver, Git/GitLab
Work management: GitLab
Platform: Linux
Build management: GitLab
Timo H.
Last position:
Software Developer at Continentale Krankenversicherung AG
- Implementation of a REST-based web service for querying contract, claims, customer, and sales data as part of the Dialogmanager project.
- Data release is done in compliance with CoC requirements and individual user permissions from IAM (Identity and Access Management).
- Implementation using JBoss EAP 8.1 (JakartaEE 10) and Java 21 as well as JAX-RS, CDI, Microprofile-Config, Microprofile-OpenAPI.
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.
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
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
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, Business Intelligence
Top industries
Information Technology, Banking and Finance, Government and Administration
Certification focus areas
Information Technology, Project Management, Quality Assurance
Bachelor's degree or higher
96%
Master's degree or higher
74%
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 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.
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 19 Sep 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 (69%)
- Government and Administration (63%)
- Automotive (49%)
- Professional Services (49%)
- Transportation (46%)
- Manufacturing (46%)
- Insurance (43%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
Data structure foundations
An Entity-Relationship Model, often called an ER model, describes the data a system must store and how that data connects. It represents entities such as customers, orders or products, their attributes and the relationships between them. The model gives business and technical teams a shared view before database tables are created.
From concept to schema
Professionals commonly move through conceptual, logical and physical modelling. They identify entities, define primary and foreign keys, set cardinality and participation rules, then translate the result into a relational schema. Normalisation helps reduce duplication, while denormalisation may support carefully chosen access patterns.
Tools and ecosystem
ER modelling sits close to relational database design and SQL. Specialists may work with:
- Crow’s Foot, Chen and UML notation
- MySQL Workbench, Oracle SQL Developer Data Modeler and ERwin Data Modeler
- PostgreSQL, MySQL, Microsoft SQL Server and Oracle Database
- Schema migration, data catalogue and documentation tools
Where companies use it
Companies use ER models when designing transactional systems, reporting databases, master data structures and integration interfaces. In Germany, specialists may support manufacturing, logistics, finance, healthcare and retail systems where consistent business data matters. Remote work is effective when workshops, domain decisions and model reviews are documented clearly.
When freelance expertise helps
External expertise is useful when a new platform needs a stable data foundation or an existing schema has become difficult to change. Typical tasks include:
- Converting business requirements into entities and relationships
- Reviewing keys, constraints and normalisation choices
- Reconciling schemas across applications or acquisitions
- Preparing migration plans, data dictionaries and review documentation
What strong specialists deliver
Strong professionals connect business language with precise database design. They ask about ownership, lifecycle, optionality, history and expected queries instead of drawing isolated boxes. They explain trade-offs, validate models with stakeholders and leave behind readable diagrams, documented assumptions and implementation-ready definitions.
Frequently asked questions
Quick answers to the questions that come up most around Entity-Relationship Model.
An Entity-Relationship Model is used to describe entities, attributes and relationships before or during database design. It helps teams clarify business rules, identify data ownership and create a reliable foundation for relational tables and SQL.
An ER model expresses the meaning and structure of data at a conceptual or logical level. A database schema is the implemented structure, including tables, columns, constraints, indexes and other database-specific details.
An Entity-Relationship Model specialist is valuable when a new system spans several business domains, when existing data is inconsistent or when a migration needs a clear target structure. They can also review a proposed schema before implementation creates costly dependencies.
A strong Entity-Relationship Model professional usually understands relational database design, SQL, normalisation, data migration and integration patterns. Experience with requirements workshops, data dictionaries and modelling tools is also useful.
The right Entity-Relationship Model experience depends on the scope and risk of the system, not on a fixed duration. A small domain may need focused modelling and review, while a large migration calls for someone who can resolve conflicting definitions across teams and systems.
Yes, Entity-Relationship Model work is well suited to remote collaboration when workshops, diagrams and decisions are shared in a consistent workspace. On-site sessions can still help when domain knowledge is difficult to document or many stakeholders must agree quickly.
An Entity-Relationship Model is often chosen for detailed relational data structure and integrity rules. UML can describe broader software behaviour and structure, while dimensional modelling focuses on analytics with facts, dimensions and reporting access patterns; the choice depends on the system’s purpose.
A quality Entity-Relationship Model uses clear names, consistent keys, explicit cardinality and documented business rules. Ask the specialist to trace important requirements through the model, explain normalisation decisions and show how the design supports expected queries and future changes.
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 810 € 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, 74% 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 (23%).
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 (69%), and Government and Administration (63%).
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 (83%), and Business Intelligence (71%).
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 Request a free demo
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FRATCH CEO
