Entity-Relationship Model Experts in Germany
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Meet FRATCH Experts in Germany, who have recently used Entity-Relationship Model
Maciej Sawicki
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 Paschek
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 Dinler
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 Kunz
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
- Coordination of the architect pool
- Support for program management in building the transformation project based on agile methods
- Consideration of regulatory requirements for IT projects in the federal administration
Dirk Markus M.
Last position:
Scientific Software Consulting Engineer
Technical audit for scientific software.
David Kaselow
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 Heilmann
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
Bernhard Schmitz
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 Diekmann
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 Marx
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 Waldschmitt
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
Ralf Borchardt
Last position:
Business Owner of the Central Funding Platform at BMWK
- Digitization of processes in a complex federal environment to increase the competitiveness of economy
- Supplier management and organizing IT systems development
- Focus on quality assurance and TQM
Wolfgang Tomaschek
Last position:
Overall Project Manager at itzbund
Project content: The use of “Generative Pretrained Transformer” technologies (GPT) will massively change the world of work in the coming years. ITZBund is developing a base service for this, which can be used by its 200 customers. This base service is offered as an on-prem and a cloud variant. Started in 12/23, from 05/24 productive systems (based on MVP) could already be rolled out and operated successfully for several agencies and federal ministries.
Project metrics:
- Budget in 2024 approx. €20M
- approx. 70 people in the core project context
- regular (indirect) contact with approx. 80 people in the wider project environment
My main tasks:
- Overall responsible external project manager
- Project definition phase/project setup and establishment of the project organization
- Strategic and operational project planning, as well as shaping and ongoing adjustments of the project
- Ongoing coordination with project owners and stakeholders in ITZBund
- Ongoing coordination with subproject managers, agile roles and other project staff
- Responsibility for project controlling, quality management, risk management and change management
- Responsibility for providing the base service on on-prem and cloud environments and its continuous development
- Planning and leading several hypercare phases
- Collaboration and ongoing coordination with a partner project of a federal ministry and provision of an MVP
- Coordination with agile teams
- Coordination with operations, release and deployment
- Responsibility for the implementation of the first customer projects
- Responsibility for creating an AI governance
- Ensuring accessibility (BITV)
- Responsibility for setting up a subproject for marketing activities
- Support in building an efficient proposal process
- Stakeholder management
Methodology:
- V-Model XT ITZBund
- Scrum
Tools used:
- Microsoft Office, Skype, MS Project, Confluence, Jira, SharePoint, Miro
Dimitrij Neumann
Last position:
Logistics Designer / Network Designer at Deutsche Bahn Cargo
- Requirements analysis, design, and development of a product for freight logistics (dispatching, planning, timetable and network optimization)
- Documentation of technical focus areas and support with acceptance and integration testing
- DBMS-agnostic modeling and mathematical algorithms for optimization with solver integration (Gurobi, Cplex, Coin-OR)
- Implementation of service layer, automated testing, and integration with third-party systems
Sara Zarei
Last position:
Data Analyst / Analytics Engineer at IDG Tech Media GmbH
- Designed, built, and maintained scalable ETL/ELT data pipelines using Python, SQL, REST APIs, AWS Lambda, S3, PostgreSQL RDS, EventBridge, CloudWatch, Docker, Apache Airflow, and BigQuery – integrating data from GA4, Google Ads, Meta Ads, CMS, CRM, newsletters, events, and B2C ordering systems into analytics-ready datasets.
- Built a cross-brand lakehouse architecture from AWS to BigQuery – transforming raw JSON/CSV data into structured, partitioned, and reusable reporting layers with staging, intermediate, canonical, and mart models.
- Designed relational and dimensional data models: 3NF staging models, star schemas, fact tables, dimension tables, daily KPI aggregates, and dashboard-optimized marts for marketing, content, subscription, event, CRM, and revenue analysis.
- Implemented production-grade data quality and pipeline reliability features: incremental loads, idempotent upserts, deduplication, schema validation, row matching, null checks, anomaly detection, freshness monitoring, logging, retries, and error alerts.
- Automated cross-brand reporting processes and data products – pipelines for 73 newsletter campaigns, 31 lead list syncs, 52 event partner reports, and a 500K-record company matching pipeline; reduced manual data preparation by approx. 70% and increased analyst productivity by approx. 30%.
Discover over 15,000 top freelancers
Statistics of experts using Entity-Relationship Model
Aggregated from the professional profiles of matched freelancers.
Experience
28 years
Position duration
6.5 years
Positions per freelancer
23
Top business areas
Information Technology, Product Development, Project Management
Top industries
Information Technology, Banking and Finance, Government and Administration
Certification focus areas
Information Technology, Project Management, Product Development
Bachelor's degree or higher
95%
Master's degree or higher
80%
Doctorate
10%
Certifications per freelancer
3
Most common languages
German, English, French
Speak two or more languages
100%
Based on our profile pool as of 30 Aug 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 30 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
About the technology
ER basics
The Entity-Relationship Model is a way to describe data before it becomes tables, keys, and queries. It helps teams define entities, attributes, and relationships in a clear ER diagram or ER model. Strong specialists use it to reduce confusion early and keep database design aligned with the business.
Where it helps
- New database design and data modeling
- Refactoring messy schemas
- Mapping business rules into data structures
- Documentation for analysts, product teams, and technical specialists
It is common in application backends, reporting systems, and integration work. In Germany, companies often bring in ER model specialists when multiple teams need one shared view of master data.
Tooling and notation
Entity-Relationship work often goes hand in hand with tools for diagramming, schema review, and database documentation. Professionals may work with Chen notation, Crow’s Foot notation, and common modeling tools used alongside SQL and relational database design. The exact tool matters less than the clarity of the model and the quality of the rules behind it.
What good specialists do
Good experts do more than draw boxes and lines. They ask about optionality, cardinality, naming, normalization, and how data changes over time. They also spot gaps between the model and real business behavior before those gaps become costly rework.
When to bring one in
Bring in freelance expertise when a schema is growing fast, requirements are unclear, or teams disagree on what a thing really is in the data model. It also helps during migrations, consolidation after acquisitions, and reviews of legacy ER diagrams that no longer match the system.
Project outcomes
A strong engagement usually leaves you with a cleaner model, better documentation, and fewer surprises for development teams. The result is easier schema maintenance, more reliable relationships, and a data structure that is simpler to extend. For remote or on-site work in Germany, clear communication in English or German is often enough when the model is well defined.
Frequently asked questions
Quick answers to the questions that come up most around Entity-Relationship Model.
The Entity-Relationship Model is used to plan how data should be structured before it is implemented in tables and queries. It helps teams define entities, relationships, and constraints so the database matches the business rules. That makes it useful for new systems, redesigns, and data cleanup work.
An ER model is the underlying way of thinking about data, while an ER diagram is the visual form many teams use to discuss it. People also call it an ERD or Entity-Relationship diagram. In practice, companies often need both: the model for precision and the diagram for communication.
Entity-Relationship Model work focuses on data structure, keys, and relationships for databases. UML class diagrams are broader and can describe software structure, behavior, and object design. If the goal is a clean relational schema, ER modeling is usually the better fit.
A strong Entity-Relationship Model specialist usually understands SQL, normalization, relational database design, and schema migration work. Business analysis skills matter too, because the model has to reflect how the company really uses data. Clear documentation and stakeholder communication are also important.
An Entity-Relationship Model project can be small, but the person leading it should have done real schema design before. Simple diagrams are easy to create; accurate models that handle optionality, shared entities, and future change are harder. For critical systems, you want someone who has reviewed and corrected models, not just drawn them.
Yes, Entity-Relationship Model work is often well suited to remote collaboration. Workshops, screen sharing, and short review sessions are usually enough if the team can explain the business rules clearly. On-site time can help when the data model is tied to local processes or many stakeholders need live alignment.
A good Entity-Relationship Model specialist explains trade-offs clearly and asks sharp questions about rules, not just names. Look for clean cardinalities, consistent terminology, sensible normalization, and a model that matches real use cases. If the person can defend every relationship and entity, that is usually a strong sign.
A Entity-Relationship Model or ERD is the better choice when the requirements are still being clarified or when multiple teams need shared agreement. Going straight to tables can lock in bad assumptions too early. An upfront model is especially useful for complex domains, migrations, and long-lived systems.
The average hourly rate of freelancers in Germany who have used Entity-Relationship Model in their recent projects is 102 €, which corresponds to a daily rate of about 812 € based on an 8-hour working day.
Of the freelancers in Germany who have used Entity-Relationship Model in their recent projects, 95% hold at least a Bachelor's degree, 80% hold at least a Master's degree, and 10% hold a doctorate.
On average, freelancers in Germany who have used Entity-Relationship Model in their recent projects have 28 years of professional experience, with a single engagement typically lasting around 6.5 years.
The most common languages among freelancers in Germany who have used Entity-Relationship Model in their recent projects are German (100%), English (96%), and French (22%).
The most common industries among freelancers in Germany who have used Entity-Relationship Model in their recent projects are Information Technology (93%), Banking and Finance (63%), and Government and Administration (59%).
The most common business areas among freelancers in Germany who have used Entity-Relationship Model in their recent projects are Information Technology (96%), Product Development (85%), 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 Request a free demo
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Philipp Thomaschewski
FRATCH CEO
