Clean Architecture Experts in Berlin
matched in minutes from over 15,000 CVs with the power of AI.Hire experts who design layered systems, keep business rules independent from frameworks, and clean up complex codebases with Clear Architecture principles. From application boundaries and use case orchestration to testable domain design, get fast, precise matching with vetted, available freelancers.
Meet FRATCH Experts in Berlin, who have recently used Clean Architecture
Jorge Nuricumbo
Last position:
Senior Developer at SafeXSmart KI Solutions UG
AI Platform Backend – Senior Developer
Brought in to design and build a backend for an AI platform from scratch, 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 single interface.
- Designed and developed a backend from scratch in C# / .NET 10, including domain modeling with DDD, a versioned RESTful API layer, and cloud infrastructure setup on Azure.
- Built a real-time chat infrastructure with Server-Sent Events (SSE), message persistence, and delivery guarantees for live operation of AI influencer personas at scale.
- Developed a media management service with integration of cloud object storage for upload and retrieval of 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
Oleg Abrazhaev
Last position:
Staff Software Engineer at Kpler Germany GmbH
- Delivered a new notifications platform implementation built from scratch to replace existing and upcoming services
- Collaborating with other teams to integrate more domains
Tech stack:
- Data: Scala 3, Apache Kafka, Python, Airflow, Astronomer
- BE-FE: TypeScript, NestJS, Java, Spring Boot, Vue
- Dev-ops: AWS, PostgreSQL, Docker, GitHub Actions, Kubernetes, Helm, ArgoCD
Imran Ali
Last position:
Software Engineer II at LivePerson Germany GmbH
- Led development of 15+ microservices (Java 17, Spring Boot) driving customer interactions; migrated from on-prem to GCP Kubernetes, improving scalability and reducing infra cost by 20%.
- Optimized user services with CouchDB caching and API refactoring, cutting response times by 35% and enhancing customer experience.
- Implemented canary deployments, FluxCD GitOps, and CI/CD optimizations in GitLab, reducing release lead time by 25% and enabling zero-downtime rollouts.
- Set up Grafana health checks and Anodot alerts for latency, error, and throughput monitoring, reducing MTTR by 40%.
- Built secure APIs using OAuth2, DPoP, and Gatekeeper, integrated REST and GraphQL, and achieved 90%+ test coverage with unit and E2E tests.
- Mentored junior developers, promoted Agile best practices, and collaborated cross-functionally to deliver high-impact, reliable customer-facing features.
Wolfram Knan
Last position:
AI / Machine Learning Engineer (Projects & Applied AI) at UNIVERSITÉ PARIS 1 PANTHEON-SORBONNE & LIORA
- Designed and implemented a hybrid recommendation system (content-based + collaborative filtering)
- Built end-to-end ML pipelines including data processing, feature engineering, model training, and evaluation
- Developed RAG-based LLM systems using LangChain and vector databases for semantic search and knowledge retrieval
- Established MLOps workflows with MLflow for experiment tracking, versioning, and deployment readiness
- Implemented deep learning models (computer vision & classification) using PyTorch and TensorFlow
Cristian Petra
Last position:
iOS Team Lead at Qlaunch Gmbh
- Contributed to the architecture design process, resulting in scalable and maintainable solutions for complex projects.
- Enhanced app performance by optimizing code and implementing efficient algorithms.
- Stayed current with industry trends to ensure implementation of best practices in app development.
- Led a team of iOS developers for timely completion of projects and achieving client satisfaction.
- Translated basic design plans into full iOS app frameworks, delegating project components to appropriate team members.
- Estimated work hours and tracked progress using Scrum methodology.
Fady Kuzman
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
Burak Ceylan
Last position:
Senior Android Developer at Awesome Technologies GmbH
- Optimized the Amp healthcare app alongside a senior developer, specifically enhancing data caching mechanisms which led to a 25% improvement in load times.
- Applied MVI architecture, resulting in a 30% decrease in bugs and streamlining testing processes.
- Implemented CI/CD with Bitrise, reducing deployment sizes from 120MB to 104MB.
- Led the migration of 40% of the Java codebase to Kotlin.
- Achieved 85% unit test coverage.
Olaf Nouvortne
Last position:
Frontend Engineer at Danaher/Hach Lange GmbH
- Developed a SolidJS frontend UI for a spectrometric water analysis system on an ARM-based embedded Linux platform
- Prototyped UI in TypeScript React/Nx with LitElements and MQTT integration
- Built production UI using SolidJS, SUID, i18next, Ajv, MQTT.js, C3.js
- Refined requirements with UX team and water analysis system engineers
- Defined and documented system architecture, MQTT message formats, frontend architecture, and development setup
- Set up frontend system from scratch, implemented domain-oriented type system, UI components, and application state
- Managed MQTT pub/sub services and schema-based message validation in frontend
- Coached two junior frontend developers
- Worked in an agile remote team using JIRA, Git, and Bitbucket
Artem Kirkov
Last position:
Software Architect at VR Payments
- Worked on the development of cloud-based web platform for different financial solutions (Payment by invoice, EPI, Freenet)
- Made technical and architectural decisions, discussed with management team the direction of the platform
- Provided technical expertise, made software improvements
- Participated in meetings, reviewed tickets, wrote documentation
- Technologies used: C#, .NET, MS Azure Services, Azure SQL, CI/CD, Azure DevOps, Jira
Khaled Mohamed
Last position:
Senior/Staff Backend Engineer at Heycar (Mobility Trader GmbH)
- Heycar is a leading automotive platform redefining the used car market through intelligent data pipelines, multi-tenant services, and dealer-focused tooling. I led initiatives across backend architecture, data ingestion, and identity management to enhance scalability, reliability, and developer productivity.
- Ingestion Platform: Designed a unified ingestion platform with YAML-based configuration, enabling new dealer data pipelines to be onboarded without code changes, cutting setup time from ~2 months to 2-3 days and improving scalability by 40%.
- Keycloak Leadership: Acted as the company's Keycloak expert, scaling it for multi-tenant identity management and extending functionality with custom plugins and delegated admin APIs.
- Back-Office Tooling: Developed a back-office application integrated with Salesforce, enabling dealers to manage inventory, convert leads, and handle support requests in real time.
- Multi-Tenant Migration: Collaborated across backend teams to migrate Heycar's core services into a unified multi-tenant cluster, ensuring high availability.
- Frontend CI Optimization: Optimized monorepo delivery by implementing CircleCI dynamic config with NX, deploying only affected UI projects and drastically cutting build times.
- Observability & Mentorship: Enhanced monitoring and release reliability while mentoring backend engineers and improving code review standards.
Hai Dang
Last position:
Principal System Architect & Tech Lead at IU International University of Applied Sciences
Leading architecture and delivery of AI-powered educational content platform, managing two development teams with full technical ownership.
Designed and architected the Content Hub platform replacing legacy SiteFusion systems, enabling professors to create AI-assisted learning materials for improved student outcomes.
Established technical strategy, defined architecture requirements, and aligned two cross-functional teams (AI Media Team, TEAQ Team) on a unified delivery roadmap.
Implemented Clean Architecture principles and AI-agent-friendly documentation standards across the engineering organization.
Drove adoption of modern development workflows including CI/CD automation and MongoDB-based content management solutions.
Jan Helwich
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.
Muhammad Jahangir Javed
Last position:
Senior Full Stack Developer at Freelancer
- Architected RESTful APIs and microservices using .NET Core.
- Designed and managed SQL Server and Cosmos DB databases.
- Developed responsive frontends with Angular, Bootstrap, and TypeScript.
- Deployed and managed Azure cloud infrastructure.
- Implemented unit tests for both backend and frontend modules.
Muhammad Ahmed Shehzad
Last position:
Senior Software Engineer at Verbund Pflegehilfe
Own Azure-hosted ASP.NET Core microservices for chronic-care workflows, sustaining 99.8% uptime across 3,000+ patient interactions.
Shape HL7 FHIR-based patient, encounter, and observation profiles delivering a unified source of truth for clinical teams and integrations.
Implement SignalR telemetry, Application Insights alerting, and automated pipelines that surface deteriorating vitals in under three seconds.
Automated consultant outreach by orchestrating Twilio voice campaigns via n8n workflows and VAPI AI assistants, boosting successful client contacts by 55%.
Entlass Manager: Led the end-to-end build of the chronic-care coordination platform, standing up Azure-native microservices, clinical data flows, and patient-facing tooling from initial requirements through production release.
Power Dialer: Built the Twilio-driven consultancy auto-dialer and n8n workflows, raising client reachability to 85%.
Dine Albrecht
Last position:
Frontend Developer (Astro) at Mindful
- Built marketing site for video app launch
- Implemented responsive UI and performance optimizations
Discover over 15,000 top freelancers
Statistics of experts using Clean Architecture
Aggregated from the professional profiles of matched freelancers.
Experience
15 years (Germany: 16 years)
Position duration
2 years (Germany: 1.8 years)
Positions per freelancer
8 (Germany: 11)
Top business areas
Information Technology, Product Development, Project Management
Top industries
Information Technology, Healthcare, Education
Certification focus areas
Information Technology, Project Management, Quality Assurance
Bachelor's degree or higher
100% (Germany: 94%)
Master's degree or higher
43% (Germany: 48%)
Certifications per freelancer
0 (Germany: 1)
Most common languages
German, English, Spanish
Speak two or more languages
100% (Germany: 98%)
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 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 Clean Architecture
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
What it is
Clean Architecture is a way to structure software so the core business logic stays independent from frameworks, databases, and UI details. It is often linked to Robert C. Martin and sometimes called Uncle Bob’s Clean Architecture. Teams use it to keep code easier to test, change, and hand over.
Where it fits
It is a strong fit for systems with clear domain rules, long-lived business processes, and many moving parts.
- Web applications with complex workflows
- APIs and backend services
- Internal tools that need long-term maintainability
- Systems that must swap frameworks or infrastructure without rewriting the core
Common layers
Professionals working with Clean Architecture define clear boundaries between entities, use cases, interfaces, and delivery mechanisms. They map dependencies inward so the center does not depend on outer technical details. That helps teams keep business rules stable while the outside layers evolve.
Skills around it
Strong specialists usually combine architecture judgment with practical coding habits.
- Domain modelling and use case design
- Dependency inversion and interface design
- Testing at unit and integration level
- Refactoring legacy code into smaller boundaries
- Working with common stacks such as Java, C#, TypeScript, and Kotlin
When companies bring help
Berlin teams often bring in freelance Clean Architecture experts when a product grows fast, a monolith becomes hard to change, or a new team needs a clearer structure. They also help when moving from ad hoc layers to a design that supports better testing and safer change. In Berlin, this is common for product teams that need remote specialists who can collaborate well in English and align with local teams quickly.
What good work looks like
Good professionals do more than draw circles on a diagram. They can explain trade-offs, keep boundaries simple, and show how the structure supports real delivery. They also write code that makes the domain easy to read, and they know when a lighter design is better than strict rules.
Frequently asked questions
Curious about Clean Architecture? Here are the answers that come up again and again.
Clean Architecture is used to keep business rules separate from frameworks, databases, and user interfaces. It is common in APIs, service layers, internal tools, and products that need to stay maintainable as they grow. The goal is not a perfect diagram; it is code that can change without constant breakage.
Clean Architecture is closely related to hexagonal architecture and onion architecture. All three focus on inward-facing dependencies and isolating the core domain from technical details. The names differ, but the practical goal is usually the same: protect business logic from infrastructure noise.
A strong Clean Architecture specialist helps when a codebase has become hard to test, hard to extend, or too tied to a single framework. They are also useful during rewrites, modularization work, or when a team needs clearer boundaries between domain logic and delivery code. If the system changes often, architecture support pays off quickly.
A good Clean Architecture expert usually brings domain modelling, test design, dependency inversion, and refactoring skill. Experience with API design, persistence boundaries, and common patterns such as repositories and presenters also matters. The best specialists can explain why a boundary exists, not just place one on a diagram.
Clean Architecture does not need to be used everywhere, and small projects may only need a few of its ideas. It becomes more valuable when the business rules are stable but the technical stack changes often. For larger systems, an experienced specialist can help avoid overengineering while still keeping the core clean.
Clean Architecture is stricter about dependency direction than a basic layered design. That extra discipline can improve testability and change tolerance, but it also adds design work. If the project is small and stable, a simpler layered approach may be enough.
Yes. Clean Architecture work often fits remote collaboration well because boundaries, use cases, and contracts can be reviewed clearly in writing and in code. In Berlin teams, it still helps when specialists can communicate well in English and join local discussions when needed.
Look for a Clean Architecture professional who can explain trade-offs, show real refactoring examples, and connect design choices to business needs. Good work leaves the core easy to test, keeps outer layers thin, and avoids turning the codebase into abstract ceremony. Ask how they would simplify the structure if the project is smaller than the pattern suggests.
The average hourly rate of freelancers in Berlin, Germany who have used Clean Architecture in their recent projects is 77 €, which corresponds to a daily rate of about 616 € based on an 8-hour working day.
Of the freelancers in Berlin, Germany who have used Clean Architecture in their recent projects, 100% hold at least a Bachelor's degree and 43% hold at least a Master's degree.
On average, freelancers in Berlin, Germany who have used Clean Architecture in their recent projects have 15 years of professional experience, with a single engagement typically lasting around 2 years.
The most common languages among freelancers in Berlin, Germany who have used Clean Architecture in their recent projects are German (100%), English (100%), and Spanish (13%).
The most common industries among freelancers in Berlin, Germany who have used Clean Architecture in their recent projects are Information Technology (100%), Healthcare (60%), and Education (40%).
The most common business areas among freelancers in Berlin, Germany who have used Clean Architecture in their recent projects are Information Technology (100%), Product Development (100%), and Project Management (53%).
Main locations of FRATCH Experts, who have recently used Clean Architecture
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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Philipp Thomaschewski
FRATCH CEO
