arc42 Experts in Germany
for clear, maintainable software architecture documentationHire experts who structure architecture decisions, document quality requirements and connect arc42 with tools such as C4 model, PlantUML and ADRs. Get precisely matched with vetted, available freelancers for fast project support.
Meet FRATCH Experts in Germany, who have recently used arc42
Jens R.
Last position:
Platform Architect & Senior Developer at Direct client, industrial measurement technology, medium-sized company
- Technical leadership across hardware, firmware, and software teams; scope: hardware/firmware team (4 people) and leadership group (5 people)
- Consolidated and documented a product family that had grown over more than 15 years and aligned it with CRA compliance — from the bare-metal I/O module to the cloud interface.
- Provided the most important customer product with the essential requirements and architecture documentation within two months — for a firmware landscape that had grown over more than 15 years. It now supports the customer’s modernization strategy.
- Established a monthly reporting line to the supervisory board and executive board within three months: nine meetings since 12/2025. The report itself is versioned and built from the CI pipeline; it is based on automatically collected activity and release data instead of assessments.
- Built a container-based CI/CD infrastructure from scratch: cross-compilation, host tests, and documentation builds in one continuous pipeline.
- Introduced declarative QA gates for DevOps and development artifacts — from the start using lefthook instead of pre-commit, executed in a dedicated container image.
Technologies used: arc42, req42, tpo42, docToolchain, PlantUML, ArchiMate, C4 model, ADR, C, C++ (GTest), CMake, Bare Metal (ARM Cortex-M3/M7), OCI containers, Jenkins, lefthook, Prometheus, Grafana, SBOM, CRA, OPC, SCADA, PLC integration, IPv6 migration, Zero Trust, Sociocracy 3.0, Cynefin
Jens H.
Last position:
Interim CTO (occasional assignments) at Fujitsu / FSAS
Stabilization of an Azure/.NET landscape in live operation.
- Architecture, DevOps, and operational readiness; technical decisions under time pressure
- Azure DevOps, monitoring, ETL/ELT, cloud security, FinOps, and data-mesh-related topics
Technologies: Azure DevOps, .NET, CI/CD, monitoring, FinOps
Fred H.
Last position:
Software Architect and Developer at Personal project
Recurring problem in my own AI-assisted projects: requirements analysis, use cases, and architecture decisions can be created quickly with AI support, but remain difficult to follow and scattered across Markdown files – knowledge is lost as soon as it is no longer in the context window. arknet turns requirements engineering and architecture knowledge into structured, verifiable data instead of plain text: requirements, use cases, and architecture decisions form a consistently linked knowledge graph, traceable from requirement to architecture decision – queryable by both people and AI agents. Technically based on RDF/OWL and a custom MCP server.
Result: Working MCP daemon, Docker image published automatically to GHCR, nine hexagonal modules, eleven ADRs (including an Open-Core licensing model). Requirements engineering and Ubiquitous Language hexagons are active. Public as a Community Edition under Apache-2.0 since 07/2026 (github.com/kogn-io/arknet), together with the Claude Code plugin and GHCR image; Open-Core model.
Label: Java, Maven, RDF, RDF4J, OWL, SPARQL, Model Context Protocol, Spring AI, Docker, GitHub, Git, Claude Code, Obsidian, DDD, Hexagonal Architecture, ArchUnit, JUnit, AssertJ, Interface Development, Software Architecture, Continuous Integration, Knowledge Management
Volker F.
Last position:
Technical Lead | Software Architect | Embedded Software Engineer at Hydac
- Development of safety-related embedded software for a mobile machine on a Hydac TTC 2390 controller.
- Implementation in C with consideration of SIL 3 / ASIL D and MISRA-C:2025.
- Implementation of communication via CAN, CANopen, and J1939.
Standards, guidelines and norms: ISO 26262, IEC 61508, MISRA-C:2025
Technologies: C99, Hydac TTC 2390, Infineon TriCore Aurix TC397, Hightec C/C++ Compiler, PC-lint Plus, CAN, CANopen, J1939, MISRA-C:2025
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
Christoph T.
Last position:
Backend Software Developer (Java) at German Football Association (DFB) e. V.
- Client: Prime Force Group GmbH
Technologies used: Java 25, Spring Boot 4, MapStruct, JSpecify, PostgreSQL, Redis, Liquibase, REST/OpenAPI, Apache Kafka, Apache Solr, OpenID Connect via IronGate/Keycloak, SAP Customer Data Cloud, JUnit, Testcontainers, Karate, Playwright, GitLab monorepo with CI/CD, Jenkins, JFrog Artifactory, FluxCD, Docker, Kubernetes on Azure, OpenTelemetry, arc42, Jira, Confluence
The Team Management Center is the new central platform of the DFB for planning, managing, and carrying out team activities for the national teams - from squad selection and training camps to communication with players, clubs, and legal guardians. The platform is designed for multi-tenancy for the DFB and regional associations; player, club, and master data are intentionally not copied, but connected at runtime via the DFBnet APIs.
I have been involved in the project continuously since the architecture and concept phase (Sprint 0) and work in a distributed Scrum team in two-week sprints. In addition to implementation, my focus is on architecture alignment, connecting the DFBnet interfaces, as well as code reviews and test automation as quality assurance in the team.
Focus areas:
- Development and implementation of the multi-tenancy concept (tenant model for the DFB and regional associations), including data model, access layer, and Liquibase migrations.
- Design of the person service and the search concept based on Apache Solr.
- Integration of the DFBnet APIs (player, person, and club search, club data), including authentication and synchronous master data synchronization.
- Hardening the integration through resilience patterns: separate read timeouts for each search path, correction of circuit breaker counting, limiting parallel requests, and a club cache to reduce load on the external system.
- Development of self-service endpoints for players (own activities, activity details, games), including an access concept for participants, as well as person documents and file uploads.
- Standardization of API design: OpenAPI annotations, nullability model via a custom ModelConverter, JSpecify migration of the DTOs, and documented API guidelines.
- Build and maintenance of Karate-based API and integration tests, integration tests with Testcontainers, test guidelines, and bug triage from the integration and reference environments.
- Code reviews via merge requests, architecture documentation according to arc42, and architecture decisions (ADRs) in Confluence.
- Automated deployment to the integration and reference environments, analysis of login and OIDC issues in combination with IronGate.
Status: ongoing - as of 08/2026 in Sprint 17, around 940 person hours worked; testable delivery to the integration environment every two weeks.
Osman T.
Last position:
Senior Architect, DevOps Engineer at genPsoft GmbH
IT consulting, analysis, architecture design, new and further development, code review, test automation, continuous integration, continuous delivery in backend and frontend areas for Automotive Project Instavalo.
Frontend:
- Implementation of UI components according to specifications, especially style guides and responsive design eith React and Typescript
- Component testing
- Code documentation
- CI/CD with Gitlab Pipeline
Backend / IoT:
- Analysis and architectural design with AWS Greengrass IoT on Edge Devices
- Setting up Microservices containers with Docker Compose on Edge device with AWS Greengrass and AWS IoT IAM, Token Exchange Service, Ansible
- CI/CD with Gitlab Pipeline, Terraform, AWS ECR
- Logging with Fluentbit Lua Language for AWS Cloudwatch
- Python Lambda for AWS Greengrass Recipe deployment on Edge Devices
- Implementation of test-driven development with JUnit, Mockito, and code Coverage
- Jacoco
- Definition of REST interfaces with OpenAPI / Swagger
- Development and enhancement of software based on Java Quarkus, Typescript NestJs NodeJs and Python
- Authentication and authorization in Aws IAM
- Development of REST and gRPC interfaces for the frontend and backend
- Implementation of Maven dependencies with DevSecOps OWASP
- Spring AI, Jetbrains AI Assistant, Junie, Github Copilot, Claude Code, Agents, Skills, Command, Hooks, Subagents
Tezcan D.
Last position:
Solution Architect / Project Manager at German Football Association
- Overall responsibility for the project lifecycle from scope definition to completion
- Close collaboration with platform teams, IT leaders, and external service providers
- Application of SAFe principles and structured sprint work
- Creation of a migration roadmap with clear milestones
- Monitoring of the lifecycle: onboarding, repository migration, replication of permissions, and system tests
- Visualization of the architecture with PlantUML and Gliffy as well as documentation in Confluence
- Regular status reports and running knowledge transfer sessions
Pierre G.
Last position:
Ansible Automation, Windows Third Level Support at DB InfraGO AG
- PRISMA project
- Ansible automation
- Windows third-level support for Windows NT, Windows 2000, Windows 2013, Windows 2016, Windows 2019
André H.
Last position:
Linux IT Admin at ReiserST
- Development and maintenance of IT architectures with embedded Linux systems.
- Designing, implementing, and optimizing backend applications and script-based solutions.
- Analyzing and resolving issues, including troubleshooting and user support.
- Developing and implementing security concepts for cloud solutions.
- Administering networks (DHCP, DNS, NTP, VPN).
- Technologies: Linux, PowerShell, Bash, Python, Ansible, Kubernetes, GitLab CI.
- Methods: Kanban.
Dimitri W.
Last position:
Software Architect at Environmental services company (cooperation with Sitegeist Media Solutions GmbH)
Conceptual design and implementation of a modular customer portal based on Laravel.
The focus was on defining a maintainable system architecture with broad use of Domain-Driven Design principles (within the Laravel architecture), introducing automated quality assurance processes (test strategy, CI integration), and preparing an auditable operation (logging, traceability of changes) in an AWS-based infrastructure, taking IT security standards according to NIST and process requirements according to ISO 9001 into account.
Achievements:
- Analysis and structuring of business requirements in close coordination with stakeholders
- Documentation of the system architecture and infrastructure incl. change and release management
- Design and implementation of an interface for integrating SAP systems
- Planning and implementation of automated tests for quality assurance
- Implementation of security and compliance requirements, including SBOM generation, software license management, and QA processes
- Technical consulting and support for the internal IT team
- Introduction and establishment of AI-supported development processes (Spec-Driven Development), including AI-readable specifications, integration of AI instructions into the development environment, and training developers for productive use
Technologies and tools: SAP, Docker, ddev, PHP 8.4, Laravel, Filament, C4 Model, Architecture Decision Records (ADR), Mermaid, PlantUML, Spec-Driven Development, Claude, GitHub Copilot, Codex
Vincent R.
Last position:
Freelancer at VINROTLAB.IO
- Consulting and creation of various web applications based on SharePoint and the React framework for different clients
- Development and testing of accessible apps for SharePoint
- Creation of various test cases for test automation
- Development of various solutions based on Azure
- Creation of various web services based on .NET
- Development of various SharePoint Framework solutions
- Development of various UI solutions based on SharePoint
- Consulting and creation of various Power Apps applications and Power Automate for the steel industry and an IT consulting company
- Support, consulting, and development with offshore teams for SharePoint 2013, 2016, and microservices for a logistics company
- Consulting, concept design, and development of microservices and web applications based on Microsoft technology and the React framework for a logistics company
- Consulting, concept design, and development of various SharePoint Framework solutions on SharePoint 2016 for logistics
- Consulting for the migration from SharePoint 2010 to 2016 for an IT consulting company
Michael T.
Last position:
Development of an app for displaying sheet music at Freelance Software Developer
- Industry: Digital music solutions
- Technologies used: Flutter, Dart, iOS, Android, GitLab, PlantUML
Leif S.
Last position:
Software Architect at QualityMinds GmbH
- Lead software architect and technical team lead for a new logistics platform for load carrier trade
- Core design of software architecture using arc42 spanning frontend, backend, delivery strategies and cloud native infrastructure with Domain Driven Design and Hexagonal Architecture
- Evaluation of initial business requirements and software development roadmap
- Technical team lead in a Scrum team of 9 people
- Introduced and strengthened AI-assisted (JetBrains AI & GitHub Copilot) and collaborative code development strategies to speed up feature development
Cedric B.
Last position:
Enterprise & Cloud Security Architect at ---
Enterprise & Cloud Security Architect supporting the modernization of the SDK application landscape as part of the KVNeo transformation program. Responsible for enterprise architecture, cloud governance, security architecture, and the definition of technical standards for strategic business applications.
Key responsibilities include architecture governance, target architecture development, cloud and integration architecture, security-by-design, and the translation of regulatory requirements into sustainable technical solutions across multiple business domains.
Responsibilities and achievements
- Designed and reviewed target architectures for strategic insurance applications and enterprise services.
- Developed architecture documentation based on Arc42 and Architecture Decision Records (ADRs).
- Defined governance models, architecture principles, and technical guidelines for cross-domain initiatives.
- Supported the modernization of archive, document management, and output management platforms.
- Designed integration architectures using REST APIs and event-driven communication patterns.
- Led architecture discussions with enterprise architects, development teams, product owners, and business stakeholders.
- Translated regulatory requirements such as DORA and ISO/IEC 27001 into practical architecture decisions.
- Designed security concepts covering Identity & Access Management, authorization, authentication, auditability, and logging.
- Supported SIEM integration, security monitoring, and enterprise logging concepts.
- Evaluated technical risks, technical debt, and architecture improvements while providing decision papers for architecture boards.
- Established architecture governance processes and contributed to enterprise-wide transformation initiatives.
- Supported cloud governance activities and the definition of secure cloud architecture standards.
- Facilitated architecture workshops and coordinated cross-functional stakeholders across business and IT.
Technologies & Methods Microsoft Azure • Arc42 • Architecture Decision Records (ADR) • REST APIs • Event-Driven Architecture • Microsoft Entra ID • Active Directory • IAM • SIEM • Cloud Governance • Enterprise Architecture • Security Architecture • Azure API Management • Jira • Confluence • Draw.io • DORA • ISO/IEC 27001 • Agile • Scrum
Discover over 15,000 top freelancers
Statistics of experts using arc42
Aggregated from the professional profiles of matched freelancers.
Experience
20 years
Position duration
1.6 years
Positions per freelancer
20
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Automotive, Banking and Finance
Certification focus areas
Information Technology, Product Development, Project Management
Bachelor's degree or higher
82%
Master's degree or higher
61%
Doctorate
9%
Certifications per freelancer
4
Most common languages
German, English, French
Speak two or more languages
95%
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 arc42
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.
arc42 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 (98%)
- Automotive (63%)
- Banking and Finance (58%)
- Government and Administration (53%)
- Insurance (50%)
- Manufacturing (50%)
- Healthcare (43%)
- Transportation (43%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
What arc42 covers
arc42 is an open template for documenting and communicating software architecture. It gives teams a practical structure for capturing goals, constraints, context, building blocks, runtime behavior, deployment views and important decisions. The template is technology-neutral, so it fits monoliths, distributed systems, cloud platforms and embedded software.
Where teams use it
Companies use arc42 when architecture knowledge must remain understandable beyond the original project team. Typical situations include:
- Documenting a new system before implementation
- Making legacy systems easier to change
- Preparing architecture reviews and handovers
- Recording risks, constraints and quality requirements
- Aligning business, product and technical stakeholders
Ecosystem and tooling
arc42 works well with lightweight documentation workflows and existing engineering tools. Specialists often combine it with the C4 model for diagrams, PlantUML or Mermaid for versioned visuals, and Architecture Decision Records for focused decisions. Markdown repositories, wikis and documentation portals can all host an arc42 document, while automated checks help keep diagrams and text close to the system.
When freelance expertise helps
External professionals are useful when a company needs an independent view of a complex system or wants to establish a consistent documentation practice. They can turn scattered knowledge into a navigable arc42 document, facilitate workshops with domain and delivery teams, and connect architecture concerns with operational and security requirements. Support is also valuable during modernization, migration and due diligence work.
Skills that matter
Strong arc42 professionals understand more than the template headings. They can explain trade-offs, separate facts from assumptions and choose the right level of detail for each audience. Useful adjacent skills include domain modeling, API design, cloud and deployment concepts, security, observability, requirements engineering and technical writing. Familiarity with version control and collaborative review is equally important.
How quality is judged
A good arc42 document answers the questions a team will actually face without becoming a catalogue of every implementation detail. It should show system boundaries, dependencies, responsibilities, runtime behavior, deployment choices and quality goals in a consistent language. In Germany, remote collaboration is often effective when workshops, review responsibilities and documentation conventions are agreed early; on-site sessions can help when domain knowledge is fragmented across teams.
Frequently asked questions
Not sure where to start with arc42? These answers cover the essentials.
arc42 is used to document software architecture in a structured but adaptable way. It helps teams explain system context, major building blocks, runtime behavior, deployment, quality requirements and architectural decisions to both technical and non-technical stakeholders.
arc42 is a broader documentation template, while the C4 model focuses mainly on visualizing software structure at different levels. They work well together: C4 diagrams can support the context, building-block and runtime sections of an arc42 document.
An arc42 specialist should understand software architecture, domain modeling, quality attributes and technical communication. Experience with C4, UML or PlantUML, Architecture Decision Records, cloud deployment and version-controlled documentation is often useful.
The right level depends on the situation, not on the size of the template. A focused documentation review may need a specialist who can quickly understand an existing system, while a modernization program benefits from someone who can lead workshops, resolve conflicting views and maintain the documentation over time.
Yes, arc42 work is well suited to remote collaboration because documents, diagrams and decisions can be reviewed asynchronously. German teams should define workshop language, repository access, review cycles and ownership clearly; on-site sessions may help when important knowledge is distributed across departments.
arc42 is technology-neutral and can describe both legacy environments and cloud-native systems. It can capture monolith boundaries, integration constraints and migration risks as well as services, containers, managed infrastructure, deployment flows and operational concerns.
A useful arc42 document supports real decisions and stays aligned with the system. Strong professionals remove obsolete detail, make assumptions visible, link quality requirements to design choices and use diagrams only where they improve understanding.
Ask an arc42 specialist to explain how they would discover system knowledge, select the right level of detail and validate the result with stakeholders. Review examples of clear architecture documentation, decision records or diagrams, and look for evidence of careful questioning rather than template completion alone.
The average hourly rate of freelancers in Germany who have used arc42 in their recent projects is 99 €, which corresponds to a daily rate of about 792 € based on an 8-hour working day.
Of the freelancers in Germany who have used arc42 in their recent projects, 82% hold at least a Bachelor's degree, 61% hold at least a Master's degree, and 9% hold a doctorate.
On average, freelancers in Germany who have used arc42 in their recent projects have 20 years of professional experience, with a single engagement typically lasting around 1.6 years.
The most common languages among freelancers in Germany who have used arc42 in their recent projects are German (100%), English (93%), and French (15%).
The most common industries among freelancers in Germany who have used arc42 in their recent projects are Information Technology (98%), Automotive (63%), and Banking and Finance (58%).
The most common business areas among freelancers in Germany who have used arc42 in their recent projects are Information Technology (100%), Product Development (90%), and Quality Assurance (78%).
Main locations of FRATCH Experts, who have recently used arc42
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
