Refactoring Experts in Cologne
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Meet FRATCH Experts in Cologne, who have recently used Refactoring
Edgardo C.
Last position:
Independent Senior Software Engineer & Integration Consultant at Thinkronic
Software engineering and integration consulting for enterprise clients, with a focus on backend development, APIs, system integration, and event-driven architectures. Currently developing and evolving a recruitment and staffing platform using Elixir and RabbitMQ, including asynchronous, event-driven communication and integrations with external recruitment and staffing platforms.
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.
Hooman B.
Last position:
Fullstack Developer at Möbel Roller GmbH
- Further development of the existing e-commerce platform based on SAP Commerce (Hybris) to meet the growing demands of digital commerce.
- Ensuring the scalability and performance of the backend, so the platform remained stable and efficient even under heavy user load.
- Development and integration of new OCC REST APIs and services for modular extensions and flexible adjustments, to implement new features quickly.
- Optimization of data flows and interfaces, which significantly improved platform efficiency and system performance.
- Ensuring a maintainable and scalable code base by using Clean Code principles, proven design patterns, and a future-proof architecture.
- Reduction of errors through extensive testing with JUnit, Mockito, and load tests with Gatling, supported by the introduction of automated test processes.
- Improved system performance through targeted refactoring measures and efficient database queries, especially to handle peak loads.
- Use of modern cloud and monitoring tools such as Kubernetes, Google Cloud Platform (GCP), and Grafana to ensure a stable and monitored infrastructure.
- Clear improvement in efficiency, scalability, and reliability of the platform, which now meets the demands of a dynamic and growing e-commerce market.
Kay O.
Last position:
Fullstack Developer at INIT GmbH
- Development of monitoring and control systems for public transportation
- Development of a platform for real-time monitoring of passenger information and ticketing systems, as well as an application for remote control and status monitoring of access control systems
- Development of dynamic forms, complex tables, real-time dashboards (SignalR), and reusable frontend components (using Storybook)
- Implementation of REST interfaces in the backend
- Deployment to the Microsoft Azure Cloud
- Technologies used: Angular 20, Angular Material 3, Dev Extreme, Storybook, C#/.NET 10
Alexander V.
Last position:
Senior DevOps / Platform Engineer at Kaufland e-commerce / real.digital (ex hitmeister.de)
- Evolved the platform from bare-metal infrastructure with a monolithic PHP application to a hybrid Google Cloud architecture with Go microservices on Kubernetes
- Managed and scaled a production infrastructure with 300+ VMs and dozens of clusters, including MySQL, PostgreSQL, MongoDB, RabbitMQ, Redis and Elasticsearch clusters
- Designed architecture, deployment, monitoring, performance analysis, and upgrades for all platform services using Terraform and Ansible
- Migrated observability systems from ELK and Prometheus to Datadog, managed with Terraform
- Introduced Jenkins CI/CD with SonarQube integration and automated tests to speed up feedback cycles
- Containerized the testing environment and implemented GitLab CI pipelines for Docker image builds, static code analysis, and infrastructure tests
- Performed zero-downtime migrations of MySQL and MongoDB clusters to Google Cloud
- Developed reusable Ansible roles for database clusters and automated data obfuscation for staging environments
- Decomposed monolithic databases and migrated to microservice architectures
- Built tools to detect and optimize slow queries in MySQL and MongoDB
- Conducted online schema migrations with pt-online-schema-change without downtime windows
- Developed internal Go applications for batch queries, GitLab-Jira integration, and MongoDB backup recovery
- Technologies: Debian, Ubuntu, Alpine, Go, Bash, Python, PHP, SQL, GitLab CI, Jenkins, Drone CI, MySQL, MongoDB, PostgreSQL, Redis, Elasticsearch, RabbitMQ, Kafka, Docker, Kubernetes, Nomad, Ansible, Terraform, Grafana, ELK, Prometheus, Datadog, Nagios, Zabbix, Nginx, HAProxy, Vault, Helm, SonarQube, Filebeat, Auditbeat, Google Cloud, AWS
Fatih K.
Last position:
Mobile App Developer at ING Belgium
- Part of a squad focused on intensive module development and integration
- Close collaboration with other squads and teams to integrate modules and essential components
- Use of SwiftUI and the Coordinator pattern to develop clean and understandable code
- Creative collaboration with UX designers in Figma and implementation in code
- Industry: Banking
- Project language: English
- Organizational form: Kanban
- Tools: Azure, Confluence, Figma, Teams
- Team size: 40 people
- Version control: Git, GitFlow, Azure
- App Store product: ING Banking
- Programming languages: SwiftUI, Swift
- Patterns: Coordinator, MVVM
- Swift Package Manager
- Localization: Yes
- Testing: XCTest, XCUITest
Discover over 15,000 top freelancers
Statistics of experts using Refactoring
Aggregated from the professional profiles of matched freelancers.
Experience
18 years
Position duration
2.3 years (Germany: 2.9 years)
Positions per freelancer
9 (Germany: 13)
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Retail, Automotive
Certification focus areas
Information Technology, Quality Assurance, Business Intelligence
Bachelor's degree or higher
100% (Germany: 88%)
Master's degree or higher
67% (Germany: 53%)
Certifications per freelancer
3
Most common languages
German, English, Spanish
Speak two or more languages
100% (Germany: 97%)
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 Cologne 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 Cologne 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 29 Oct 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 (83%)
- Automotive (50%)
- Tourism (50%)
- Food and Beverage (33%)
- Transportation (33%)
- Professional Services (33%)
- Telecommunication (33%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
What Refactoring Means
Refactoring is the disciplined restructuring of existing code without changing its observable behavior. It improves readability, maintainability and design while preserving tested functionality. The work can target a single method, a shared module or the architecture of a large application. Code refactoring is usually performed in small, verifiable steps.
Where It Is Used
Companies use refactoring to reduce technical debt and make future change safer. It supports product teams maintaining web applications, APIs, mobile backends, embedded systems and business software. Common triggers include slow delivery, duplicated logic and fragile releases.
- Simplify complex methods and domain models
- Break apart tightly coupled modules
- Replace obsolete patterns and interfaces
- Prepare legacy systems for new features
Ecosystem and Tooling
Effective specialists work inside the language and framework of the codebase, using IDE inspections, safe rename tools, static analysis and automated tests. They may work with Java, .NET, JavaScript, TypeScript, Python or other ecosystems. Version control, continuous integration and code review make each change traceable. In Cologne, this often means fitting improvements into established product and enterprise delivery processes.
When Companies Need Help
Freelance expertise is useful when an internal team knows the code needs attention but cannot pause roadmap work. It also helps before a migration, merger of services, major feature launch or transfer of system ownership. Clear signals include recurring regressions, long onboarding, slow builds and fear of changing central modules.
- Establish a technical debt baseline
- Define a safe sequence of changes
- Add characterization tests around legacy behavior
- Review architecture and dependency boundaries
What Strong Specialists Deliver
Strong professionals first understand business behavior, runtime constraints and release risk. They create a practical plan, explain trade-offs and leave behind tests, documentation and reviewable commits. They distinguish refactoring from rewriting and avoid cosmetic changes that do not improve the system. Their work is measurable through simpler dependencies, clearer ownership and safer change.
Collaboration and Outcomes
Refactoring succeeds when specialists collaborate closely with product owners, testers and existing technical teams. Remote work is effective with shared repositories, reliable environments and regular review sessions; on-site work in Cologne can help when domain knowledge or legacy infrastructure is difficult to access. The best engagement ends with maintainable code and a team that can continue the improvements independently.
Frequently asked questions
Before you brief your next project: the most common questions about Refactoring.
Refactoring restructures code while keeping its intended behavior unchanged. Companies use it to reduce technical debt, improve maintainability, remove duplication and make new features safer to deliver.
Code refactoring improves an existing implementation in controlled steps, usually with tests protecting current behavior. A rewrite replaces much of the system and carries greater risk of losing hidden business rules, integrations or production knowledge.
A strong Refactoring specialist should understand the relevant programming language, framework, testing approach and version-control workflow. Useful adjacent skills include architecture review, static analysis, database design, continuous integration and domain discovery.
Refactoring experience should match the system's risk and complexity, not just its code volume. A specialist handling a legacy platform should be able to trace behavior, work with incomplete tests, communicate trade-offs and make reversible changes.
Refactoring works well remotely when the repository, test environments and review process are accessible. Cologne teams may choose remote collaboration for focused code work or combine it with on-site sessions when business context and legacy infrastructure require close discussion.
Bring in a Refactoring specialist when technical debt is slowing delivery, regressions are recurring or the internal team lacks capacity for safe improvement. External expertise is also useful before a migration, ownership transition or major change to a central system.
Quality Refactoring produces clearer boundaries, simpler logic and preserved behavior rather than merely changing code style. Review the specialist's tests, commit history, explanations of trade-offs and ability to show how future maintenance becomes safer.
A Refactoring professional should clarify the business goals, protected behavior, deployment process, test coverage and decision authority. They should also agree on scope, review points and how technical debt findings will be prioritized with the Cologne team.
The average hourly rate of freelancers in Cologne, Germany who have used Refactoring in their recent projects is 85 €, which corresponds to a daily rate of about 679 € based on an 8-hour working day.
Of the freelancers in Cologne, Germany who have used Refactoring in their recent projects, 100% hold at least a Bachelor's degree and 67% hold at least a Master's degree.
On average, freelancers in Cologne, Germany who have used Refactoring in their recent projects have 18 years of professional experience, with a single engagement typically lasting around 2.3 years.
The most common languages among freelancers in Cologne, Germany who have used Refactoring in their recent projects are German (100%), English (100%), and Spanish (17%).
The most common industries among freelancers in Cologne, Germany who have used Refactoring in their recent projects are Information Technology (100%), Retail (83%), and Automotive (50%).
The most common business areas among freelancers in Cologne, Germany who have used Refactoring in their recent projects are Information Technology (100%), Product Development (83%), and Quality Assurance (67%).
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 
Dusseldorf 
Nuremberg Request a free demo
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FRATCH CEO
