Refactoring Experts in Dusseldorf
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Meet FRATCH Experts in Dusseldorf, who have recently used Refactoring
Marijn S.
Last position:
Senior Software Engineer at Puls Security GmbH
Optimizing and acceleraÂtion of our Gitlab CI pipeline
Conceptual work for the PoC of the Zero Trust system
Extension of the policy-engine backend in Go
Extension of the policy-testing mechanism in Python
Architectural design of the PEP component of Zero Trust
Documentation of the product
Technologies: Zero Trust, Go, Python, Gitlab CI, Docker, JWT, Domain-Driven Design
Hassan A.
Last position:
DevOps & Observability Consultant at ALDI South (Albrecht's Discount)
- Supporting the DevOps team in Terraform-managed, multi-region AWS infrastructure to achieve environment parity.
- Developed end-to-end CI/CD pipelines using AWS CodePipeline, CodeBuild, and CodeDeploy, automating the build and deployment.
- Maintained pre- and post-deployment scripts to automate critical tasks such as database schema migrations and environment sanity checks.
- Implemented CI/CD flow specifically for hotfixes via separate Git branches, managing back-merge activities from feature branches to release branches to ensure code integrity through automated conflict resolution.
- Deployed a dedicated, lightweight sanity check application hosted cost-effectively on Azure Container Apps to run automated health and basic functional checks as a post-deployment activity triggered via pipeline.
- Investigated production incidents through code changes and AWS CloudWatch logs.
- Coordinated integration of Dynatrace APM and its APIs for monitoring purposes.
- Full stack QA strategist for a high-traffic e-commerce platform built on a layered architecture for the back-end testing of core platform services, especially the order management system in Zed and Glue layers.
- Managed automation activities, testing process, and refactoring practices.
- Responsible for framework migrations, setup, and training for new automation frameworks.
- Promoted a shift-left approach within the QA team and created the test concept.
- Participated in meetings with IT managers, business owners, product owners, and team members.
- Designed and implemented contract testing to validate API schema compatibility between the order management system and the Zed and Glue layers, reducing production-relevant breaking changes by approximately 3%.
- Led the migration to a multi-environment framework that enabled test execution across 4 country configurations from a single codebase.
- Integrated automated unit and functional tests directly into the GitLab CI/CD pipeline, reducing pipeline runtime by 32%.
- Coached and trained 5 QA engineers across Germany and Hungary in test automation, framework architecture, and best practices.
- Architected a layered backend test automation framework separating business logic, API request builders, and the database layer.
- Piloted AI-assisted testing with Playwright Agents, the Playwright MCP Server, and GitHub Copilot for automated test generation, execution, and self-healing Playwright scripts.
Olaf R.
Last position:
DevOps Architect / Consultant at Authority with increased security requirements
- Identification of requirements (legal, organizational, and technical)
- Design of solution architectures
- Evaluation of concepts and technologies
- Preparation of decision templates
- Architectural Decision Records (ADR)
- Coordination of implementation
- Review of implementations
- Documentation
Kacper K.
Last position:
Author
Seqnaut and Sycosm (WIP) – Embedded Audio DSP & Synthesis Platform
- Embedded audio DSP framework — synthesizers, effects, drum machines; modular audio graph
- Sequencing: PianoRoll, StepGrid, MasterClock; 8-voice polyphonic synth; CLI + OSC
- Transient Detector — dual-envelope adaptive threshold, guitar attack detection
- Hardware: Teensy 4.1, custom AFE design tapping BOSS GX-100; MIDI FX integration
Label: C++23, C, Python, CMake, FreeRTOS, Teensy 4.1 (ARM Cortex-M7), Teensy Audio (Stoffregen), DaisySP, I2S/SAI, OSC, MIDI
Andreas G.
Last position:
Senior Fullstack .NET (Core) & Angular Developer at IT Service Provider
- Supporting several agile teams in the new product development of an enterprise CRM and ERP application
- Web frontend development with Angular 17–21 (microfrontends, Domain-Driven Design, MDB-Bootstrap)
- Backend development with C# and .NET 7–10, MongoDB, MassTransit, RabbitMQ, Entity Framework Core, ElasticSearch (microservices, DDD)
- Technical feature design for assigned tasks
- Technical architecture design including forward-looking planning of AI-supported extension options
- Proof-of-concept implementation of AI-supported workflows with n8n and a locally hosted LLM (Ollama)
- Coordination with stakeholders and Product Owners, support with sprint planning
Result: Delivery of production-ready microservices and frontend modules in agile sprint cycles.
Environment: .NET 7–10 · Angular 17–21 · C# · TypeScript · OpenAPI · Microfrontends · DDD · Kubernetes · Docker · Helm · MS SQL Server · PostgreSQL · MongoDB · MassTransit · RabbitMQ · EF Core · ElasticSearch · Kibana · Azure DevOps · KeyCloak · n8n · Ollama
Thorsten O.
Last position:
Workstream Lead (WS) at Bank-Verlag GmbH
- Introduction of giro card with Visa Debit card payment function (Combocard) for Commerzbank
- Support for the Card Processing Team (card processing; Clearing & Settlement incl. Dispute Management teams) in project work
- Creation of requirements for the Clearing & Settlement team, Authorization team (AZ) and Card Production team (KP) as part of a requirements catalog
- Requirements engineering (requirements management) with business contact person
- Participation in workstream meetings between VISA Inc., SRC Security Research & Consulting GmbH, Commerzbank AG and consulting firms (PwC and Senacor Technologies AG)
- Sprint planning with Jira tickets of type Task and use of Confluence
- Creation and presentation of weekly status reports for the Clearing & Settlement, Dispute Management and Reporting & GUI workstreams
- Coordination with network and file transfer teams for connection tests of new interfaces, e.g. setup of host keys, use of VPN or sipnet connections
- Coordination of the delivery of test files, e.g. exchange rates (FX rates; TC 56 of VISA rates), VISA Debit and Credit transactions (format Base II) and EANSS/ISS Base II clearing files to the Debit Clearing System (DCS)
- Conducting coordination meetings on the use of Visanet Settlement Service (VSS) and PSD2 reports and payment traffic statistics (ZVS)
- Organizing workshops with FiServ (First Data) on Dispute Management and complaint handling
- Setup and maintenance of Open Point List (OPL) in Confluence
- Technologies/methods: Jira, Confluence, giro card, VISA Debit card, payments, Kanban board, BIN, routing, CIQ, VPAY, ScalaTest, Dispute Management
Dmitry T.
Last position:
Web Software Engineer at Freelancer
Third-side integration development (REST: Amazon, OpenAI, Etsy, Shopware, Prestashop, etc)
Performance optimization (Refactoring, SQL analysis)
LMS development and deployment (Moodle)
Cloud deployment automation (Amazon, Azure, Gitlab CI/CD, Docker)
Backend and Frontend development (Laravel, VueJs)
Collaboration with partner-developers (national and international)
Shirtigo GmbH
GRELLARTIG Digital GmbH
velpTEC edutainment GmbH
Jan G.
Last position:
Master Data Application at confidential
Visualization, search, and maintenance of various types of master data, providing them via a REST API, and implementing a variety of import and export formats.
Implementation, architecture, project management.
Technologies and tools: Angular (Signals, Signal Store, swagger-codegen, standalone components), Java, PostgreSQL, ActiveMQ, JavaScript, Spring Boot (Spring Core, Spring MVC, Spring Data/JPA via Hibernate, Spring Security, Spring Modulith), JUnit, Flyway, QueryDSL, GraphQL, REST API, Node, npm, Maven, SonarQube, GitLab CI/CD pipelines, Docker, Nexus, OpenAPI + Swagger UI, Keycloak, OAuth2, OpenID Connect, IntelliJ IDEA, Jira, Confluence.
Sebastian C.
Last position:
Public institution responsible for educational institutions in NRW
- Consulting on processes and execution of load tests, performance tests and technical tests of various applications: web portal, file cloud, email, video conferencing, learning/course platform
- Creating the load test framework
- Programming test scripts (JMeter, Selenium)
- Developing batches to support the evaluation
- Executing load tests and evaluating results, including clear reporting, recommendations for action, and bottleneck analysis
- Managing tasks and collaboration to achieve meaningful load test results
Holger G.
Last position:
IT at Holger Grittner Consulting
Discover over 15,000 top freelancers
Statistics of experts using Refactoring
Aggregated from the professional profiles of matched freelancers.
Experience
22 years (Germany: 18 years)
Position duration
2.6 years (Germany: 2.9 years)
Positions per freelancer
17 (Germany: 13)
Top business areas
Information Technology, Product Development, Operations
Top industries
Information Technology, Retail, Telecommunication
Certification focus areas
Information Technology, Business Intelligence, Product Development
Bachelor's degree or higher
75% (Germany: 89%)
Master's degree or higher
75% (Germany: 53%)
Doctorate
25% (Germany: 8%)
Certifications per freelancer
15 (Germany: 3)
Most common languages
English, German, Spanish
Speak two or more languages
100% (Germany: 97%)
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 Dusseldorf 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 Dusseldorf using Refactoring
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.
Refactoring 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%)
- Retail (60%)
- Telecommunication (60%)
- Banking and Finance (50%)
- Manufacturing (50%)
- Automotive (40%)
- Energy (40%)
- Transportation (40%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
What Refactoring Means
Refactoring is the disciplined improvement of existing source code without changing its observable behavior. It removes duplication, clarifies responsibilities and makes future changes safer. The work can target a function, a service, a module or an entire application structure.
What It Builds
Refactoring supports reliable products rather than a separate type of application. It helps teams evolve customer portals, transaction systems, APIs, mobile backends and internal software while preserving agreed behavior.
- Simplify tangled business logic
- Separate tightly coupled services
- Prepare legacy systems for new features
- Improve maintainability before a migration
Tools And Practices
Strong specialists work inside the project’s existing ecosystem. They use IDE refactoring support, static analysis, code review workflows and automated tests, with tools such as SonarQube, Git and CI pipelines. Familiarity with Java, Spring, .NET, TypeScript, Python or other stack-specific conventions helps them make safe changes.
When Companies Need It
Companies often bring in freelance expertise when releases slow down, defects cluster around fragile modules or a new feature exposes hidden coupling. Refactoring is also valuable before a cloud migration, framework upgrade, platform consolidation or handover to a new team.
- Tests are too weak to support change
- Small fixes require edits across many files
- Legacy code blocks product work
- A modernization plan needs technical groundwork
Choosing Freelance Expertise
A capable professional starts by mapping behavior, dependencies and risk before changing code. They define a small improvement path, protect it with tests and keep commits easy to review. For companies in Dusseldorf, remote collaboration can work well when documentation, review routines and communication language are agreed early; on-site sessions may help with discovery and workshops.
What Good Results Look Like
Successful refactoring leaves the system easier to understand, test and change without introducing unplanned behavior changes. Quality is visible in focused pull requests, clear decisions, useful tests and measurable reductions in complexity within the affected areas. The best specialists also explain trade-offs instead of treating a preferred pattern as a universal answer.
Frequently asked questions
Curious about Refactoring? Here are the answers that come up again and again.
Refactoring improves the internal structure of existing software while preserving its intended behavior. Companies use it to reduce technical debt, make features safer to add and prepare systems for modernization or migration.
Refactoring changes code incrementally while keeping the system working and behavior under control. A rewrite replaces a larger portion of the implementation, which can create more uncertainty and often requires stronger validation, migration planning and fallback measures.
Refactoring is strongest when combined with automated testing, code review, version control and software architecture skills. Experience with the relevant language, framework, CI pipeline, observability tools and database design is also valuable.
Refactoring work benefits from professionals who have handled production code and can judge risk in unfamiliar systems. The right level depends on the codebase, test coverage and business criticality; a focused module cleanup needs less breadth than a cross-system modernization.
Refactoring is often suitable for remote collaboration because changes, tests and design decisions can be reviewed asynchronously. Teams in Dusseldorf should agree on documentation, repository access, review windows and whether workshops require German, English or both.
Refactoring should not distract from an urgent production incident or replace a needed product decision. A specialist may recommend postponing broad cleanup when behavior is poorly understood, tests are absent or the intended target architecture has not been agreed.
Refactoring quality is shown by preserved behavior, focused changes and stronger tests around the affected code. Review the before-and-after design, defect risk, deployment evidence and whether future changes are genuinely easier, rather than judging the work by formatting alone.
Refactoring engagements can deliver clarified modules, reduced coupling, improved test coverage and documented technical decisions. Depending on scope, the professional may also provide a staged cleanup plan, updated CI checks and guidance for continuing the work after handover.
The average hourly rate of freelancers in Dusseldorf, Germany who have used Refactoring in their recent projects is 89 €, which corresponds to a daily rate of about 711 € based on an 8-hour working day.
Of the freelancers in Dusseldorf, Germany who have used Refactoring in their recent projects, 75% hold at least a Bachelor's degree, 75% hold at least a Master's degree, and 25% hold a doctorate.
On average, freelancers in Dusseldorf, Germany who have used Refactoring in their recent projects have 22 years of professional experience, with a single engagement typically lasting around 2.6 years.
The most common languages among freelancers in Dusseldorf, Germany who have used Refactoring in their recent projects are English (100%), German (90%), and Spanish (10%).
The most common industries among freelancers in Dusseldorf, Germany who have used Refactoring in their recent projects are Information Technology (100%), Retail (60%), and Telecommunication (60%).
The most common business areas among freelancers in Dusseldorf, Germany who have used Refactoring in their recent projects are Information Technology (100%), Product Development (80%), and Operations (70%).
Main locations of FRATCH Experts, who have recently used Refactoring
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 
Frankfurt 
Stuttgart 
Nuremberg Request a free demo
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Philipp Thomaschewski
FRATCH CEO
