MediatR Expert in Germany
for clean application flows, matched in minutes with vetted specialistsHire experts who design request and notification handlers, shape CQRS-based application layers, and integrate MediatR with ASP.NET Core and dependency injection. Get precise access to vetted, available freelancers for your project.
Meet FRATCH Experts in Germany, who have recently used MediatR
Giuseppe A.
Last position:
Embedded Software Development at Inheco
- AI Integration (LLM & RAG): Designed and built an internal intelligent RAG system (Retrieval-Augmented Generation) based on LLMs, n8n, and vector data to automatically analyze technical documents and error logs.
- Design & Implementation: Designed a robust RS-232/UART communication interface for an SBC-based embedded device used to control medical shaker systems.
- Architecture & Protocol Design: Built a highly maintainable software structure (OOP, SOLID) and defined resilient, hardware-level communication protocols, including multithreading and advanced error handling.
- Quality Assurance & DevOps: Automated testing with xUnit, ran integration tests directly on the hardware target, and maintained technical documentation to strict medical technology standards via Azure DevOps.
Label: C#, .NET, LLMs, RAG, n8n, RS-232, UART, Multithreading, async/await, xUnit, gRPC/protobuf, Blazor, MudBlazor, EF Core, Visual Studio 2026, Azure DevOps
Jorge N.
Last position:
Senior Developer at NDA
AI Platform Backend – Senior Developer
Hired to design and build an AI platform backend from the ground up, including multi-provider LLM orchestration and real-time infrastructure for AI influencer personas at scale.
Tasks and Responsibilities
- Architected and implemented a multi-LLM orchestration layer with Semantic Kernel to integrate GPT-4 and other providers for core platform logic and AI influencer personas, reducing model-switching overhead by abstracting provider APIs behind a unified interface.
- Designed and developed a backend from the ground up in C# / .NET 10, including domain modeling with DDD, a versioned RESTful API layer, and cloud infrastructure on Azure.
- Built real-time chat infrastructure with Server-Sent Events (SSE), message persistence, and delivery guarantees for running AI influencer personas live at scale.
- Developed a media management service with cloud object storage integration for uploading and retrieving influencer-generated content.
- Created an integration and unit test suite with data seeding for reliable regression testing across all core platform flows, significantly reducing the production error rate.
Tools and Technologies: C#, .NET, ASP.NET Core, Python, TypeScript, MySQL, Semantic Kernel, EF Core, Minimal APIs, LLM Orchestration, Prompt Engineering, Agentic AI, Generative AI, AI-Assisted Engineering, Claude Code, GitHub Copilot, Google Gemini, OpenAI API, Ollama, Redis, Azure, Azure Container Apps, Azure Database for MySQL, Docker, GitHub Actions, Clean Architecture, Vertical Slice Architecture, CQRS, Domain-Driven Design, REST API, xUnit, Integration Testing, Unit Testing, Jira, Confluence, Scrum
Martin H.
Last position:
Software Architect at Hays AG
- C# development .Net 8.0
- Technical responsibility for architecture decisions (DDD, Clean Architecture, Microservices)
- Introduction and systematic evaluation of GitHub Copilot, analysis of efficiency benefits, identification of suitable application scenarios, assessment of code quality
- Development of best practices for using Copilot within the team, support during rollout and coaching of individual developers
- Conducting code reviews, architecture documentation according to Arc42
- Building stable CI/CD pipelines with Azure DevOps, introduction of automated quality assurance with SonarQube and .editorconfig
- Collaboration with stakeholders to continuously optimize technical concepts
- Technologies used: Azure Devops Server, Git, Sonarqube, Visual Studio 2022, Sparx EA 17, Nagios LS, Nagios XI, C#, Resharper 2.24.3, Clean Architecture, DDD, EF-Core, Arc24, Microservices, Angular, MediatR, SignalR, Copilot, OpenAI
Oliver F.
Last position:
Modernization of a Multi-Company Backend System at Energy utility company
Further development and modernization of a mature Aspire backend application in the energy utility sector, focusing on new business requirements, testing, legacy code cleanup, and stable backend delivery.
Key Contributions & Results Implemented new business requirements in the context of customer orders, subcontractors, and cross-company backend processes, ensuring consistent workflows across a distributed system landscape. Gradually modernized existing backend components and reduced technical debt through targeted legacy code cleanup, refactoring, and structured code reviews. Improved the testability of business-critical services by expanding automated tests with xUnit, AutoFixture, and clearer validation structures. Supported the further development of workflow automation and integration processes through microservices, messaging, and API-based communication. Took over source code from external companies, systematically assessed code quality, and derived technical improvements for maintainability, stability, and integration. Worked in agile development processes with Jira, Confluence, and Azure DevOps and supported cross-team coordination on architecture, quality, and implementation. Technical Metrics Technologies & Methods C#, .NET, ASP.NET, ASP.NET Core, Aspire, Docker, RabbitMQ, gRPC, REST API, Swagger, Microservices, NServiceBus, AutoMapper, Autofac, xUnit, AutoFixture, FluentValidation, Entity Framework Core, MediatR, Redis, Consul, Serilog, SonarQube, Azure DevOps, Azure Monitor, GitLab, Google Protocol Buffers, IronPDF, Mailjet, Jira, Confluence, Miro, Agile Development, Scrum, Code Reviews, Refactoring, Legacy Code Cleanup, Workflow Automation, Power Grids
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
Glenn K.
Last position:
Lead Software Architect at knowledgepark GmbH
- Leading an eight-member team with a focus on actively promoting an agile mindset
- Supporting the introduction of Scrum within the team
- Planning, designing, and implementing the macro architecture of a distributed system landscape
- Documenting self-contained systems, microservices, and legacy applications
- Integrating third-party software components
- Special attention to scalability and reliability
- Ensuring traceable processes through event sourcing
- Developing multiple ASP.NET and Blazor applications in C# using .NET 5 to 8
- Applying strategic methods from Domain-Driven Design (DDD)
- Decoupling modules using the Mediator pattern (MediatR) and CQRS
- Continuously ensuring code quality through Test-Driven Development (TDD)
- Conducting code reviews via pull requests and pair programming
- Optimizing data storage and access with MS SQL Server, Redis, and EF Core
- Reducing costs and wait times through caching and automatic scaling
- Implementing background jobs using Hangfire
- Developing and integrating REST APIs
- Integrating RabbitMQ and NServiceBus for communication between systems
- Securing various REST APIs and web UIs with OAuth2/SAML/SSO and JWTs
- Developing cross-team technology standards
- Introducing architecture methods in agile teams
- Applying software craftsmanship and Extreme Programming (XP) principles
- Ensuring software quality according to ISO 25010 standards
- Implementing DevSecOps practices
- Migrating various legacy on-premises applications (Azure Stack & IIS) to Azure Cloud
- Modernizing existing application (from .NET Framework 3 & 4)
- Leading containerization with Docker and subsequent migration to Kubernetes
- Introducing and optimizing CI/CD pipelines
- Monitoring production systems using Serilog, Prometheus, Grafana, and Application Insights
- On-call duty and implementing automated error detection
- Analyzing and fixing issues in production as 3rd level support
- Coaching and upskilling working students, interns, and other developers
- Designing and delivering internal training sessions
- Conducting event storming and user story mapping sessions
- Supporting the product owner with technical matters
- Optimizing workflows in Azure DevOps Services
- Requirements engineering in cooperation with relevant business units and domain experts
Patrick S.
Last position:
Senior Software Engineer at Delivery Hero
- Led a team of 6 software engineers to develop and maintain an AI-driven healthcare platform, enabling automated diagnostics and prescriptions based on real-time ECG data analysis
- Designed and developed a robust Revenue Cycle Management (RCM) system, integrating HL7 and FHIR APIs to enable seamless interoperability, real-time data exchange, and HIPAA-compliant data handling, improving billing efficiency, claim processing, and regulatory adherence in healthcare operations
- Migrated a legacy monolithic application to a scalable microservices architecture, enhancing system modularity, scalability and maintainability while implementing key design patterns such as Strangler, Database-per-Service, API Gateway, Saga and CQRS for efficient service communication and transaction management
- Architected and led a C# 9/.NET 6 microservices ecosystem handling hotel reservations, payments, and loyalty programs, enabling 99.99% uptime across 10+ services
- Defined OpenAPI/Swagger contracts and auto-generated client SDKs, reducing front-to-backend integration time by 50%
- Containerized each service with Docker and orchestrated deployments via Kubernetes, slashing release lead time from days to hours
- Designed PostgreSQL schemas optimized for high-volume transactional workloads and implemented Redis caching layers to accelerate read-heavy endpoints by 80%
- Built Kafka streaming pipelines for real-time availability updates and audit logs, processing 2 million+ events per hour with end-to-end delivery guarantees
- Implemented unit and integration tests for React applications using Jest and React Testing Library, ensuring 80%+ test coverage, improving component reliability, and preventing regressions
- Defined and deployed AWS cloud infrastructure using Terraform, while containerizing and orchestrating microservices with Docker and Kubernetes, improving automation and system scalability
- Built a scalable full-stack booking application using React 18 and Django REST Framework, integrating Celery and Redis for asynchronous task processing, while deploying on GCP with Cloud Run and Firestore, enabling real-time scheduling, payment processing, and automated notifications
- Mentored junior developers through code reviews, pair programming, and knowledge-sharing sessions, improving team efficiency by 30% while maintaining comprehensive API documentation using Swagger/OpenAPI
Dirk V.
Last position:
Fielmann AG
- New and further development of a microservice architecture for managing eyeglass insurance and handling employee purchases
- Angular 19, .NET 9, Kubernetes, Docker, Hangfire, Redis, MediatR, PostgreSQL, Oracle
Discover over 15,000 top freelancers
Statistics of experts using MediatR
Aggregated from the professional profiles of matched freelancers.
Experience
21 years
Position duration
1.3 years
Positions per freelancer
19
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Manufacturing, Banking and Finance
Certification focus areas
Information Technology, Business Intelligence, Human Resources
Bachelor's degree or higher
67%
Master's degree or higher
50%
Certifications per freelancer
2
Most common languages
German, English, Spanish
Speak two or more languages
100%
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 MediatR
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.
MediatR 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%)
- Manufacturing (75%)
- Banking and Finance (63%)
- Healthcare (63%)
- Transportation (63%)
- Automotive (50%)
- Education (50%)
- Media and Entertainment (50%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
What MediatR does
MediatR is a popular .NET library that implements the mediator pattern for in-process communication. It routes commands, queries, and notifications to dedicated handlers, reducing direct dependencies between application components. Teams use it to keep business workflows structured and easier to test.
Core application patterns
MediatR commonly supports a CQRS-style separation between actions that change state and requests that read data. A request handler contains one focused use case, while notification handlers allow several parts of an application to react to an event. Pipeline behaviors add reusable processing around requests without placing cross-cutting logic in every handler.
.NET ecosystem
Strong specialists connect MediatR with the wider Microsoft stack and established application patterns.
- ASP.NET Core controllers, minimal APIs, and endpoint layers
- Dependency injection and service registration
- Entity Framework Core and transactional workflows
- FluentValidation, logging, authorization, and pipeline behaviors
- Unit and integration testing for handlers
When expertise helps
Companies often bring in freelance expertise when a growing .NET codebase has tangled service dependencies or inconsistent business logic. A specialist can introduce request handlers safely, refactor existing application services, define notification boundaries, and document conventions for the internal team. This is useful for new products as well as modernization work in German companies that need clear remote or on-site collaboration.
Delivery and maintainability
Good MediatR work starts with clear request and response contracts, meaningful handler boundaries, and deliberate ownership of side effects. Professionals understand when a mediator adds useful separation and when a direct service call is simpler. They also consider transaction scope, error handling, cancellation, idempotency, and observability instead of treating handlers as a new place for unstructured code.
Choosing a specialist
Look for someone who can explain the trade-offs of the mediator pattern rather than recommending MediatR everywhere. Review examples involving command and query separation, pipeline behaviors, notifications, testing, and dependency injection. Strong professionals make the architecture easier to follow, keep handlers focused, and leave practical conventions that other .NET specialists can apply.
Frequently asked questions
What clients ask us most about MediatR — answered in short.
MediatR is used to dispatch commands, queries, and notifications within the same application process. It helps separate callers from the handlers that execute business use cases, often alongside CQRS and ASP.NET Core.
MediatR introduces an intermediary between the caller and the operation, which can reduce coupling and support pipeline behaviors. Direct service calls are often simpler for small or stable flows, so a strong specialist chooses the approach that fits the application rather than adding mediation by default.
A MediatR specialist should understand C#, ASP.NET Core, dependency injection, Entity Framework Core, testing, and common CQRS patterns. Experience with validation, authorization, logging, transactions, and observability is also valuable when handlers run critical business workflows.
A MediatR freelancer can help when a .NET system has complex use cases, tightly coupled services, or inconsistent application-layer conventions. They are also useful during modularization, CQRS adoption, legacy refactoring, and the setup of handler and pipeline testing practices.
A MediatR project needs a specialist who has applied the library in production-style .NET systems and can explain its architectural trade-offs. The depth required depends on the number of workflows, integration boundaries, transaction rules, and the condition of the existing codebase.
MediatR work is well suited to remote collaboration because handlers, pipelines, tests, and architectural decisions can be reviewed through shared repositories and technical discussions. German companies should agree on communication language, documentation standards, working hours, and any need for on-site workshops before the engagement starts.
Assess MediatR work by reviewing handler boundaries, request contracts, dependency usage, test coverage, error handling, and the treatment of side effects. Quality is higher when the design improves clarity without creating unnecessary indirection or oversized handlers.
MediatR is a .NET library that implements the mediator pattern for in-process messaging; it is not the pattern itself. The pattern is a broader design approach, while the library supplies interfaces, dispatching behavior, notifications, and extension points for .NET applications.
The average hourly rate of freelancers in Germany who have used MediatR in their recent projects is 86 €, which corresponds to a daily rate of about 687 € based on an 8-hour working day.
Of the freelancers in Germany who have used MediatR in their recent projects, 67% hold at least a Bachelor's degree and 50% hold at least a Master's degree.
On average, freelancers in Germany who have used MediatR in their recent projects have 21 years of professional experience, with a single engagement typically lasting around 1.3 years.
The most common languages among freelancers in Germany who have used MediatR in their recent projects are German (88%), English (88%), and Spanish (25%).
The most common industries among freelancers in Germany who have used MediatR in their recent projects are Information Technology (100%), Manufacturing (75%), and Banking and Finance (63%).
The most common business areas among freelancers in Germany who have used MediatR in their recent projects are Information Technology (100%), Product Development (100%), and Quality Assurance (75%).
Main locations of FRATCH Experts, who have recently used MediatR
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
