Event Sourcing Experts in Berlin
matched in minutes from over 15,000 CVs with the power of AIHire experts who design event streams, rebuild state from immutable histories, and connect Event Sourcing with CQRS, event stores, and Kafka. Get fast, precise matching with vetted, available freelancers.
Meet FRATCH Experts in Berlin, who have recently used Event Sourcing
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
Fady K.
Last position:
Senior Software Developer / Tech Lead at Specific Objects Technologies GmbH
- Project 1: Multi-Tenant SaaS Platform: Data Integration & Pricing Management
- Objective: New development of ELT pipeline (replacement for Java 6 legacy), integration of heterogeneous source systems (CSV, Excel, Email, external DBs), event-sourcing for complete auditability, multi-tenant architecture for tenant-capable data processing
- Challenge: Processing millions of records daily, audit compliance, data isolation between different tenants
- Solution: Stakeholder workshops for requirements analysis, event-driven architecture with Axon Framework and Apache Kafka, AWS services (EC2, S3, Lambda, SQS, API Gateway) for cloud integration, PostgreSQL with tenant-specific schemas for multi-tenant data isolation, REST API design with Spring Boot for external system integrations, comprehensive testing strategy (JUnit, Spring Test, Postman, PACT, ArchUnit)
- Results: ELT performance improved from 30+ min to 1-5 min; 2-3 hours daily saved through workflow automation; 10-20 hours/week saved through event-sourcing auditability; 100% audit compliance; secure multi-tenant data isolation for 10+ tenants
- Project 2: Multi-tenant CRM System Modernization
- Objective: Migration of CRM system (20+ years PHP/MySQL) to Java microservices, Domain-Driven Design implementation, establishment of Test-Driven Development, multi-tenant-capable SaaS architecture for multiple customer tenants
- Challenge: Remodeling complex business logic, no existing test culture, scalable tenant management with data isolation
- Solution: Comprehensive testing strategy (JUnit, Spring Test, Postman, PACT, ArchUnit), multi-tenant architecture with tenant-specific databases, REST API design with Spring Boot for cross-tenant integration, Kubernetes and Docker for container orchestration
- Results: 2× performance improvement; deployment time reduced from 40+ min to 5-7 min; migration without production outages; scalable multi-tenant solution for 15+ customer tenants
- Technologies: Java, Spring Boot 3.x, Angular, Apache Kafka, AWS (EC2, S3, Lambda, SQS, API Gateway), PostgreSQL, Axon Framework, Kubernetes, Docker, GitLab CI, REST API
Jan H.
Last position:
Technical Co-Founder at Telemarie UG
- Technical Leadership & SW Architecture: Conducting trade-off analyses for technology stacks and leading the design and implementation of the software architecture, including mobile and backend solutions. Facilitating Event Storming workshops for DDD and software architecture.
- Strategic Direction & Organizational Development: Playing a key role in defining the strategic direction of the product and organization, exploring new models such as steward ownership.
- Lean Startup & Agile Development: Introducing Lean and Agile principles, implementing lean prototypes, and ensuring adherence to Lean Startup processes, iterative development from product/solution fit to product/market fit.
- Team Building & Collaboration: Facilitating workshops, retrospectives and future workshops to collaboratively develop tactics and strategies.
- Technologies: Flutter, JS/TS, React, Google Cloud, Firebase, Android, iOS.
- Organizational Methods: Lean startup, lean canvas, lean agile, event storming, retrospectives.
Martin M.
Last position:
Florio C3G
- App that helps patients schedule their medication, track their symptoms, and biomarkers
- The app is being certified as a medical device
- Technologies: React Native, Expo, Redux Toolkit
Mario E.
Last position:
Developer and Consultant at Freelancer
Michael W.
Last position:
TUI AG / Robinson
- Developed an Internet Booking Engine (IBE) (Saber and Juniper) and other microservices
- Backend development with PHP and Symfony, endpoint and interface implementation
- Unit and integration tests
Discover over 15,000 top freelancers
Statistics of experts using Event Sourcing
Aggregated from the professional profiles of matched freelancers.
Experience
26 years
Position duration
3.2 years
Positions per freelancer
13
Top business areas
Information Technology, Product Development, Project Management
Top industries
Information Technology, Education, Retail
Certification focus areas
Information Technology, Product Development, Project Management
Bachelor's degree or higher
100%
Master's degree or higher
100%
Certifications per freelancer
1
Most common languages
German, English, Spanish
Speak two or more languages
100%
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 Berlin 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 Berlin using Event Sourcing
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.
Event Sourcing 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%)
- Education (67%)
- Retail (67%)
- Automotive (50%)
- Fashion (50%)
- Insurance (50%)
- Media and Entertainment (50%)
- Energy (33%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
Event history
Event Sourcing stores each change as a sequence of events instead of saving only the latest state. That makes the full history available for audits, replay, debugging, and rebuilding read models when business rules change. It is a strong fit for systems where every state change matters.
Typical uses
- Order and payment flows with clear traceability
- Booking, workflow, and approval systems
- Domain-heavy products with changing rules
- Systems that need replayable state and audit trails
It is often paired with CQRS when teams want separate write and read models. In Berlin, this comes up in product teams, fintech work, logistics, and enterprise systems that need clean operational history.
Tooling around it
Event Sourcing is usually implemented with an event store, durable messaging, and careful schema design for events. Common ecosystems include Java, .NET, Kotlin, Spring, Akka, Kafka, and PostgreSQL-based event stores. Strong specialists know how to version events without breaking old streams.
When to bring in help
Companies usually bring in freelance expertise when an existing model is hard to change, when auditability becomes important, or when read performance needs a redesign. They also need help with event versioning, replay safety, and deciding which parts of a system should not use Event Sourcing at all. Good specialists reduce risk early.
What strong specialists do
A strong professional works from domain events, not just technical messages. They design aggregates, enforce clear boundaries, and keep projections consistent under failure and replay. They also write migration plans for legacy data and explain trade-offs in plain language.
Delivery signals
- Clear event names that match real business actions
- Safe handling of event version changes
- Reliable rebuilds of projections and read models
- Tested replay and recovery paths
- Practical guidance on where CQRS adds value
For Berlin teams, remote collaboration is common, but on-site workshops can help align domain language with product and operations. The best experts document decisions well so engineers and stakeholders can keep working from the same event history.
Frequently asked questions
Everything clients usually want to know about Event Sourcing, in one place.
Event Sourcing is used when a system needs a durable history of every state change. Teams use it for orders, payments, booking flows, approvals, and other business processes where auditability and replay matter. It is less about storing data and more about keeping the full sequence of events that created that data.
With Event Sourcing, the source of truth is the event stream, not the current row or document state. CRUD systems usually overwrite the latest state, which is simpler but hides history. Event Sourcing gives you traceability and replay, but it also adds design and operational complexity.
Event Sourcing is often discussed with CQRS because both patterns split write behavior from read behavior. CQRS is not required, but it helps when teams need fast, purpose-built read models that are rebuilt from events. A strong specialist can tell you when CQRS adds value and when it only adds complexity.
A strong Event Sourcing specialist should understand domain modeling, messaging, persistence, and testing of replay paths. Depending on the stack, that can include Kafka, event stores, Spring, .NET, or Akka. They should also be comfortable with schema evolution and operational recovery.
Event Sourcing usually makes sense when the business rules are complex, the history matters, or the team needs rebuildable state. It is not the best default for simple forms or straightforward admin tools. A good freelancer will help you decide whether the added structure is worth it for your case.
Yes, Event Sourcing work is often remote-friendly because the main tasks are design, coding, review, and event-model documentation. For Berlin teams, short on-site workshops can still help align domain language and boundaries early. After that, delivery can usually continue smoothly online.
Look for someone who can explain the event model, aggregate boundaries, and replay strategy without jargon. A solid Event Sourcing professional has real migration experience, knows how to version events safely, and can describe failure handling for projections and consumers. Code samples and design discussions matter more than buzzwords.
Event Sourcing can work well in legacy environments when teams need a safer path to modernize state handling and auditability. It is usually introduced in one bounded area first, not across the whole system at once. The right specialist will identify where to start and where a simpler model is better.
The average hourly rate of freelancers in Berlin, Germany who have used Event Sourcing in their recent projects is 96 €, which corresponds to a daily rate of about 771 € based on an 8-hour working day.
Of the freelancers in Berlin, Germany who have used Event Sourcing in their recent projects, 100% hold at least a Bachelor's degree and 100% hold at least a Master's degree.
On average, freelancers in Berlin, Germany who have used Event Sourcing in their recent projects have 26 years of professional experience, with a single engagement typically lasting around 3.2 years.
The most common languages among freelancers in Berlin, Germany who have used Event Sourcing in their recent projects are German (100%), English (100%), and Spanish (33%).
The most common industries among freelancers in Berlin, Germany who have used Event Sourcing in their recent projects are Information Technology (100%), Education (67%), and Retail (67%).
The most common business areas among freelancers in Berlin, Germany who have used Event Sourcing in their recent projects are Information Technology (100%), Product Development (100%), and Project Management (50%).
Main locations of FRATCH Experts, who have recently used Event Sourcing
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.
Countries:
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
