Object-Oriented Programming Experts in Cologne
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Meet FRATCH Experts in Cologne, who have recently used Object-Oriented Programming
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
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
Michael K.
Last position:
Enterprise Architect, Lead Architect of the transformation program and coach at Swiss Ministry
- Development of the overall architecture
- Support for the respective workstreams in developing architectures in the areas of infrastructure, data centers, security, and network topology
- Management of the architect pool
- Support for program management in setting up the transformation project based on agile methods
- Consideration of regulatory requirements for IT projects in the federal administration
Alexander K.
Last position:
Software Tester at Buhl Tax Service GmbH
- AI-assisted creation of test cases and test data
- Creation of test cases based on requirements
- Execution of manual tests
- Defect documentation, retesting and tracking
Technologies & Tools: SCRUM, Jira, Confluence, Zephyr Scale
Nawfal C.
Last position:
Internship in Software Development at Haeger Consulting
- working in a team using an agile method (Scrum)
- Backend development in Java (Spring Boot)
- Frontend development in Angular
Dirk H.
Last position:
Owner at Soorce GmbH
- Working on a temporary assignment at REWE digital GmbH
- Agile team coach for a team in brick-and-mortar retail
- Coaching, lateral leadership, and facilitation
- Establishing agile values and applying agile methods
- Supporting team development and facilitating conflict resolution
- Facilitating company-wide strategy workshops
- Technologies: Kanban, Scrum, Microsoft Teams, Liberating Structures, Jira, Confluence, Concept Board, Miro, Test-Driven Development, OOP, DBMS (SQL, MySQL, MariaDB, PostgreSQL)
Jens H.
Last position:
#52 Test Manager in Safety-Critical Infrastructure at Telecommunications Company
- Network elements, network, operational and operator-related systems
- Supporting around 20 different products (managed agile)
- Requirements analysis and management (functional and non-functional)
- Test concept and planning (scope, test phases, effort, schedule, resources, organization, etc.)
- Aligning approach with clients and service providers
- Managing and assisting in creation of test cases for system, integration and end-to-end tests
- Guiding and supporting test execution
- Defect management and planning bug fixes with external providers
- Preparing and facilitating workshops
- Regular reporting and creating automated test reports
- Further development of agile testing methodology and configuration of supporting tools
- Conceptual support in developing a quality seal for rating product and service quality of internal and external providers
- Requirements engineering based on ISO/IEC 25010, Scrum, SaFE
- BMC Remedy, Atlassian Confluence, Atlassian Jira (including plugins Xray, Structure), Microsoft Office (incl. Visio), Obsidian, doxis document management system, Gitlab, Obsidian
Vladimir M.
Last position:
Developer at Financial services provider
- Support and further development of a framework for developing applications in a banking association: DynS/OSPE
- Migration of the framework to Java 11 and Java 17
- Java8, Java11 and Java17, Spring, Spring-Batch, Spring WebServices, Spring-Security, Spring-Data, JPA, Hibernate, OpenSource libraries etc.
- XML, JAXB, JSON, REST and SOAP services, DB2, Oracle, WebSphere or Liberty AS, FreeMaker, Junit, mock libraries, JaCoCo, Maven, IntelliJ, Eclipse, GitHub, SVN, Jira
Peter B.
Last position:
Data Warehouse Consultant (Development and Analysis) at Atruvia AG
- Developed and enhanced ETL loading jobs with IBM DataStage and optimized SQL in an IBM DB2 environment as part of the Agree21 data migration
- Analyzed data quality and developed test procedures
- Created PowerShell scripts and documented GIT deployment processes
- Technologies: RedHat Linux, IBM DB2 with DBVisualizer, IBM InfoSphere DataStage 11.7, JIRA, TortoiseGIT, TortoiseSVN, PowerShell scripts
Louis N.
Last position:
Specialist in Adobe Experience Manager & Microservices at Nguenkam Consulting & Engineering
Java 11/21
Springboot
Swagger/OpenApi
Azure Pipelines
Trivy Integration
Apache Sling
OSGI
Java Content Repository (JCR)
Apache Jackrabbit Oak
Adobe HTL
GraphQL
Maven
GitLab
IntelliJ
Azure Cloud
Azure DevOps
Terraform
AEM specialist in the Scrum team
Development and deployment of microservices via Open API interfaces
Operation of microservices in the Azure Cloud
Implementation of AEM modules and integration with microservices
Member of the knowledge transfer team and a backend coordination team
Ingo C.
Last position:
Founder, freelance CMS expert at CMS Consulting Cousin
- Freelance work as a CMS expert
Muhammet T.
Last position:
Head of IT at Audit Association of German Banks
- Overall responsibility for the strategic and operational realignment and management, further development of IT with direct reporting to the executive board
- Cloud transformation projects: MS365, Exchange Online, SharePoint Cloud, infrastructure cloud migration
- Leading an IT organization with around 20 employees
- Realigning IT as a strategic enabler for the entire organization
- Developing and implementing a holistic IT strategy ("Cloud First") including governance, security, and operational models
- Building a modern service management framework (ITIL) and effective control mechanisms
- Strategically managing software development and delivery (DevOps, CI/CD)
- Implementing cloud and digitization strategies
- Strategic planning and IT roadmap
- Optimizing IT infrastructure
- Budget and cost management
- Infrastructure migration: on-premise to on-premise (colocation)
- Overall responsibility for budget, cost optimization, resource and staff development
- Managing central digitization and transformation initiatives as well as board-level processes
Sascha N.
Last position:
Consultant at Kallisto Consulting GmbH
- Planning and further development of responsive CMS websites
- Frontend development and expansion of internal PHP applications
- CONTENS and OpenCms
Last position:
Rewe Digital
- Creation of Spring Boot integration tests
- Creation of JUnit tests for the coupon system
- Creation of component tests for Kafka topics
- Creation of CI/CD pipeline scripts
- Creation of UI tests with Playwright
- Creation of UI tests with Cypress
- Review of developer unit tests
- Planning the test architecture for integration tests
- Creation of the test automation concept
- Evaluation and creation of test reports
René P.
Last position:
CIO at clics GmbH
- Software development
- Team management
- Project management
Discover over 15,000 top freelancers
Statistics of experts using Object-Oriented Programming
Aggregated from the professional profiles of matched freelancers.
Experience
26 years (Germany: 22 years)
Position duration
3.8 years (Germany: 3.2 years)
Positions per freelancer
18 (Germany: 15)
Top business areas
Information Technology, Product Development, Project Management
Top industries
Information Technology, Banking and Finance, Healthcare
Certification focus areas
Information Technology, Project Management, Product Development
Bachelor's degree or higher
78% (Germany: 89%)
Master's degree or higher
56% (Germany: 61%)
Doctorate
11% (Germany: 8%)
Certifications per freelancer
3
Most common languages
German, English, French
Speak two or more languages
100% (Germany: 95%)
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 Object-Oriented Programming
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.
Object-Oriented Programming 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%)
- Banking and Finance (63%)
- Healthcare (38%)
- Insurance (38%)
- Government and Administration (38%)
- Telecommunication (38%)
- Aerospace and Defense (31%)
- Automotive (31%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
Core concept
Object-Oriented Programming, often called OOP, organizes software around objects that combine data with the operations that act on it. Classes define shared structure and behavior, while encapsulation protects internal state. Inheritance and polymorphism can support reuse when applied with care.
What it builds
OOP is used for business applications, desktop tools, backend services, mobile software and embedded systems. It suits domains with clear entities, rules and workflows, from orders and payments to devices and customer records.
- Model business domains with classes and interfaces
- Create reusable services and components
- Extend mature applications without breaking behavior
- Connect domain logic to APIs, databases and user interfaces
Languages and tooling
OOP is a programming approach rather than a single language. Professionals commonly use Java, C#, C++, Python, Kotlin, Swift or TypeScript, together with frameworks and testing libraries suited to the product. Git, build automation, static analysis, debuggers and continuous integration support reliable delivery.
When expertise matters
Companies bring in freelance specialists when a codebase has become difficult to change, a new domain needs a strong model or a team must modernize without interrupting operations. In Cologne, this expertise can support local product teams, industrial software, logistics systems and enterprise applications. Remote collaboration works well when design decisions, documentation and review practices are explicit.
- Restructure tightly coupled classes
- Define interfaces and service boundaries
- Introduce tests around critical behavior
- Review architecture before a major feature or migration
Strong professional practice
Strong professionals choose composition over inheritance when it keeps dependencies clearer. They use meaningful names, small interfaces, focused responsibilities and tests that protect business behavior. They also understand the surrounding runtime, persistence layer, API contracts and delivery process rather than treating OOP as isolated syntax.
Choosing the right specialist
Review examples that show how a specialist shaped a domain model, reduced coupling or improved change safety. Ask how they handle legacy constraints, ambiguous requirements and trade-offs between abstraction and simplicity. For Cologne-based teams, clarify the expected balance of on-site workshops, remote work and communication in English or German before the engagement starts.
Frequently asked questions
Not sure where to start with Object-Oriented Programming? These answers cover the essentials.
Object-Oriented Programming is used to structure software around objects that represent data and behavior. It is common in enterprise applications, backend services, desktop software, mobile apps, games and embedded systems.
OOP groups state and behavior around objects, while functional programming emphasizes pure functions and immutable data. Many modern systems combine both styles, so the right choice depends on the domain, language, team skills and maintenance needs.
A strong OOP specialist should understand software design, automated testing, version control and debugging. Useful adjacent skills include API design, database integration, clean architecture, refactoring and the specific language ecosystem used by the product.
The required depth depends on the codebase, risk and level of architectural change. A small feature may need focused implementation skills, while a legacy refactoring or domain redesign calls for a specialist who can reason about dependencies, tests and long-term maintenance.
Object-Oriented Programming can work very well in remote teams when design decisions are documented and code reviews are consistent. Shared diagrams, clear interfaces, automated tests and regular technical discussions reduce misunderstandings across locations.
Companies in Cologne should define the main language, framework, delivery goals and existing constraints before engaging an OOP specialist. They should also agree on remote collaboration, on-site workshops and whether communication is expected in English, German or both.
Ask an OOP professional to explain a real design decision, including the alternatives rejected and the maintenance impact. Look for clear reasoning about coupling, cohesion, composition, testing and domain boundaries rather than a preference for patterns without context.
OOP remains useful in cloud and distributed systems when object boundaries support clear services and business rules. It does not replace decisions about messaging, deployment, observability or data ownership, so the specialist must connect code design with the wider system architecture.
The average hourly rate of freelancers in Cologne, Germany who have used Object-Oriented Programming in their recent projects is 100 €, which corresponds to a daily rate of about 803 € based on an 8-hour working day.
Of the freelancers in Cologne, Germany who have used Object-Oriented Programming in their recent projects, 78% hold at least a Bachelor's degree, 56% hold at least a Master's degree, and 11% hold a doctorate.
On average, freelancers in Cologne, Germany who have used Object-Oriented Programming in their recent projects have 26 years of professional experience, with a single engagement typically lasting around 3.8 years.
The most common languages among freelancers in Cologne, Germany who have used Object-Oriented Programming in their recent projects are German (100%), English (100%), and French (44%).
The most common industries among freelancers in Cologne, Germany who have used Object-Oriented Programming in their recent projects are Information Technology (100%), Banking and Finance (63%), and Healthcare (38%).
The most common business areas among freelancers in Cologne, Germany who have used Object-Oriented Programming in their recent projects are Information Technology (100%), Product Development (88%), and Project Management (81%).
Main locations of FRATCH Experts, who have recently used Object-Oriented Programming
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.
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Hamburg 
Munich 
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Stuttgart 
Dusseldorf 
Dortmund 
Nuremberg Request a free demo
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Philipp Thomaschewski
FRATCH CEO
