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Object-Oriented Programming Experts

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Hire experts who design clean class models, refactor legacy code into maintainable modules, and build testable object-oriented systems across Java, C#, C++, Python, and related stacks. Get fast, precise matching with vetted, available freelancers.

Meet FRATCH Experts who have recently used Object-Oriented Programming

Verified expert

Harold Tela

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Senior Software Developer | OOP . Full Stack . Web & Mobile . Cloud-Native

Braunschweig
Harold Tela

Last position:

CPU Watcher — Cloud-Native Monitoring Application at SEUYTEL

  • Planned and developed a CPU monitoring application for monitoring system performance and resource utilization.
  • Designed and implemented a Spring Boot backend providing a REST API for processing and exposing monitoring data.
  • Developed the React frontend for presenting monitoring information in a clear and user-friendly interface.
  • Integrated PostgreSQL for persistent storage and management of application data.
  • Containerized the application and its services using Docker Compose.
  • Automated infrastructure provisioning and deployment using Terraform on AWS.
  • Structured the application as a modern, maintainable system using REST-based communication between frontend and backend.
  • Designed and developed a secure, scalable CPU monitoring architecture (cpu-watcher) with a dedicated collector application that streams monitoring data to the backend, reducing direct exposure of system resources.
  • Designed a secure cloud infrastructure with the database isolated within a private network and OIDC-based authentication.
  • Implemented Infrastructure as Code with Terraform and integrated version-controlled CI/CD pipelines to automate testing, infrastructure changes, and application deployments.
  • Designed and implemented the frontend delivery architecture using AWS CloudFront.

Stack: Spring Boot · React · PostgreSQL · REST API · Docker Compose · Terraform · AWS

Verified expert

Fadi Shoaa

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AI Engineer | Microsoft Fabric | Data Engineering | Enterprise AI | Document AI

Oberhausen
Fadi Shoaa

Last position:

Development of a production-ready Enterprise Document AI & Recommendation Platform at Freelancer

  • Development of a production-ready Enterprise AI solution for the automated processing of invoices and business documents
  • Integration of Azure AI Document Intelligence and LLM technologies into existing business processes
  • Development of robust REST APIs for automated document processing and system integration
  • Extraction, validation, and storage of structured invoice data in Azure SQL as a base for analytics and machine learning models
  • Development of an AI-based recommendation engine with machine learning and deep learning to generate personalized product recommendations based on historical purchase data
  • Implementation of logging, monitoring, error handling, and validation mechanisms for stable production use
  • Collaboration with business teams to define business rules and integrate the solution into existing enterprise processes

Technologies: Python, Azure AI Document Intelligence, Azure OpenAI, Azure SQL Database, REST APIs, Machine Learning, Deep Learning, OCR, Pandas, JSON, Workflow Automation

Verified expert

Michael Nelz

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Senior ML Engineer | AI Engineer | Problem Solver

Eichenau
Michael Nelz

Last position:

Senior AI Engineer | Forward Deployed Engineer at Tiefbau

  • Development of an AI-powered project organization tool for a civil engineering company that intelligently links project, task, tender, schedule, and document data through a knowledge graph.
  • Implementation of AI features for document analysis, information extraction, context-based assistance, and voice-based data capture based on Microsoft Azure AI, reducing administrative effort, making information available faster, and supporting project teams in decision-making.
  • Tech stack: Python, React, TypeScript, FastAPI, Claude Code, Codex, Graphify, PostgreSQL, Microsoft Azure AI Foundry, Azure OpenAI, Azure AI Speech, Azure AI Document Intelligence, Microsoft Graph, Microsoft Entra ID, Docker, Git, CI/CD.
Verified expert

Maciej Sawicki

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Product Owner

Nuremberg
Maciej Sawicki

Last position:

Product Owner at Bundesagentur für Arbeit

  • As part of the project, the further development of the identity management system was driven forward. This included a comprehensive refactoring of the interfaces to the connected target systems. In addition, several special systems were successfully connected to the IAM to ensure end-to-end identity and authorization management.
  • Technical design and solution proposals for IAM system development
  • Requirements analysis and requirements management (IREB, BABOK)
  • Alignment of the strategy with the future target architecture (TOGAF)
  • Prototyping of solutions
  • Documentation of requirements (Innovator)
  • Analysis and documentation of requirements and creation of process models (UML, BPMN, ArchiMate)
  • Modeling of requirements and system functionalities (OOA/OOD, UML)
  • Further development of interfaces (SOAP, REST)
  • Carrying out architecture reviews
Verified expert

Muhammad Tanveer Baig

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Embedded Systems | ADAS | RF Systems | Quantum Optics | R&D and Validation & Integration

Siegen
Muhammad Tanveer Baig

Last position:

Embedded Systems Consultant / Architect | Integration and Validation Engineer / Manager at Ingenieurbüro Baig

  • Led the hardware development and validation of a safety-critical 400 V battery management system (BMS) for the TOGG SUV program; performed system architecture reviews, schematic validations, EMC and reliability tests, and root cause analyses in line with relevant automotive standards (ECE-R10, CISPR25, ISO-26262). Coordinated cross-border EU engineering teams, customer reviews, and technical documentation to deliver a production-ready, validated system.

  • Architected and integrated 22 state-of-the-art ADAS validation vehicles for BMW ADCAM and LIDAR programs at Magna Electronics; synchronized up to 26 heterogeneous sensors (LIDAR, RADAR, cameras, GNSS/INS) using PTP-based timing architectures. Defined the system architecture, HW/SW interfaces for hardware-in-the-loop (HIL) reprocessing, sensor integration strategies, and data acquisition frameworks. This enabled scalable vehicle-level validation, improved validation efficiency by 25%, and reduced project costs by €1.45 million.

  • End-to-end validation and integration of automotive radar platforms for a Daimler project at Continental. Developed automated open-loop hardware-in-the-loop (HIL) environments to accurately test target tracking KPIs, field of view limits, and thermal and voltage-related ECU state machines. Used a highly complex toolchain consisting of CANoe, Lauterbach Trace32, RADAR target simulators, and EMC shielding chambers for RF and system validation. Synchronized global, interdisciplinary teams to speed up troubleshooting and close critical technical gaps.

  • Reconstructed and validated the product architecture of an electromechanical e-bike by integrating and troubleshooting critical subsystems (BMS, motor control, sensors, HMI, electronic locking systems). Built a comprehensive system-level test bench for functional testing, fault reproduction, and performance analysis; coordinated suppliers and implemented corrective actions to improve reliability and traceability.

  • Defined the system architecture and validation strategy for a LIDAR platform developed in cooperation with Elmos Semiconductor; evaluated optical measurement concepts, SPAD detector integration, and system requirements, and created technical recommendations for product development and verification.

  • Developed LabVIEW-based automation and verification software for a high-precision hydraulic and electromechanical test system for FTE Automotive; integrated NI DAQ hardware for high-frequency real-time capture of physical measurement data. Developed automated test sequences, programmable endurance tests, troubleshooting routines, data logging, and analysis tools to improve test efficiency and traceability.

  • Successfully managed complete engineering life cycles for well-known industrial customers (Magna, Continental, Farasis, FTE Automotive, BMW, Daimler, TOGG) – from requirements engineering and proof of concept through system integration and validation to technical documentation, supplier coordination, and user training.

Verified expert

Wolfgang Orgler

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DI

Freilassing
Wolfgang Orgler

Last position:

Business Analyst at DekaBank

Lead Business Analyst – Analysis and optimization of private banking processes

  • Responsibility for the business analysis and further development of business processes in private banking, with a focus on CRM, customer data management, and master data processes

  • Carrying out a comprehensive business process analysis to identify optimization potential, business gaps, and improvement opportunities along the customer lifecycle

  • Gathering, analyzing, and structuring business requirements in close cooperation with business units, management, IT architecture, and development teams

  • Creating and aligning business concepts, process models, user stories, and requirement documentation as the basis for technical implementation

  • Analyzing and optimizing existing master data processes with a focus on data quality, responsibilities, and efficient data maintenance

  • Designing and further developing CRM customer data processes while taking regulatory requirements and business goals into account

  • Planning and moderating workshops with business, IT, and stakeholders for requirements analysis, process design, and solution finding

  • Managing requirements and ensuring consistent communication between business and IT

  • Using AI-supported analysis tools to help with requirements analysis, structuring information, and improving documentation quality

Verified expert

Dorin Lupu

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Agile Coach, Organization Design & Transformation Consultant

München
Dorin Lupu

Last position:

Release Train Engineer, Program Lead & Transformation Consultant - Freelancer at Telefónica Germany

  • Transformation Consultant, Release Train Engineer and Program Lead – responsible for the new Way of Working in the Open Gateway Program; optimizing the flow of value by ensuring the ART events and artifacts function correctly, including the Open Gateway Release Train Kanban, Inspect & Adapt (I&A) workshop, ART Sync Meetings, and PI Planning to ensure stakeholder alignment;
  • Coaching and guiding the Product Owners, Business Owners, Product Management, Program Managers, Leaders, Tribe Architect
  • Coaching the OGW Core Team (cross functional) within the OGW Program and developing optimization measures in their transformation process;
  • Facilitating and working actively towards the creation of the Definition of Ready (DoR) and the product Definition of Done (DoD);
  • Introducing knowledge sharing workshops and grow the agile engineering practices;
  • Hold Team lift-off workshops;
  • Help the group to become a team by providing system team coaching and multifunctional learning;
  • Facilitate, decision making, feedback loops for learning new skills and practices

Tools: JIRA, Confluence, MS Teams, Miro

Verified expert

Mladen Blagojevic

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Senior SAP BW/4HANA / BPC / SAC Consultant – Freelancer

Berlin
Mladen Blagojevic

Last position:

Senior SAP BW/4HANA / BPC / SAC Consultant – Freelancer at Company in Berlin and Belgium in the utilities sector

  • Implementation of data models in BW/4HANA, ABAP CDS Views, HANA Calculation Views, AMDP Scripts, OData Services, object-oriented ABAP in BW, SAC.
  • Adjustments in BPC for BW/4HANA.
Verified expert

Peter Fleischer

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Subproject Manager and Solution Architect - Microsoft 365 Transformation

Walpertskirchen
Peter Fleischer

Last position:

Subproject Manager and Solution Architect - Microsoft 365 Transformation at Automotive Industry

  • Integration of highly regulated countries such as China and South Korea into a company-wide M365 tenant.

  • Technical contact for integrating special requirements for the executive board and German subsidiaries that are subject to BaFin compliance requirements.

  • Subproject management.

  • Coordination of requirements within the overall architecture.

  • Design of the use of DLP features from Microsoft Purview.

  • Design of special access restrictions via Entra ID Conditional Access.

  • Support in designing the provisioning of Teams teams and SharePoint sites with higher compliance requirements.

  • Technical support for implementing information classification with sensitivity labels for SharePoint Online and Teams.

  • Technical support for the subproject introducing CoPilot for M365.

  • Skills: M365, Purview, DLP, Entra ID, Sensitivity Labels, CoPilot, Teams, SharePoint Online.

Verified expert

Volker Foitzik

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Senior Software Engineer & Software Architect

Birkenau
Volker Foitzik

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

Verified expert

Burhan Dinler

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Experienced IT and AI Architect

Niederkassel
Burhan Dinler

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

Verified expert

Christian Pestel

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Project Manager

Berlin
Christian Pestel

Last position:

Project Manager at Kreis Segeberg

  • WiNOWiG extensions (digitalization & organization)
  • Project management for the WiNOWiG project (regulatory offenses)
  • Process optimization and coordination
Verified expert

Yusuf Congar

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Senior Software Engineer C# | C++ | Java | JS | Microservices | Vert.x | OSGI | IoT | Hardware | MQTT

Würselen
Yusuf Congar

Last position:

Senior Software Engineer at LeiKon GmbH

  • Development of scalable backend applications with C#/.NET and Java
  • Design and implementation of distributed microservice architectures
  • Development and integration of REST APIs for industrial applications
  • Development of modern web applications with React, Angular, and TypeScript
  • Implementation of MQTT-based communication solutions
  • Integration of industrial protocols such as OPC UA and Modbus TCP
  • Development of batch, process control, and HMI components
  • Containerization and deployment of applications with Docker
  • Conducting code reviews and supporting architecture decisions
  • Close collaboration with product owners, QA, and interdisciplinary teams
  • Analysis of business requirements and implementation of technical solutions
  • Further development of existing software architectures with a focus on maintainability and performance

Technologies: C#, .NET, ASP.NET Core, Java, C++, React, Angular, TypeScript, Vue.JS, MQTT, OPC UA, Modbus TCP, Docker, GitLab, MariaDB, MySQL, Linux

Verified expert

Ljubomir Obrenovic

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Senior Test Automation Engineer | QA Engineer

München
Ljubomir Obrenovic

Last position:

Senior Software Test Engineer at Keil KTM GmbH

Temporary employment

  • System black-box integration tests (BBIT, IVVQ): Execution of regression, release, acceptance, and compliance tests for safety-critical brake control units in the rail industry
  • Software test application & integration: Runtime configuration of software components and libraries, validation of interfaces, configuration dependencies, and component interactions
  • Test automation (FEAT framework): Co-development and further development of an automated test framework for test execution, reporting, and result analysis
  • Functional safety (SiL4, FuSi): Ensuring compliance with safety requirements, traceability and coverage, as well as standards compliance according to EN50126/28/29
  • Test automation for communication components: Configuration and validation of fieldbus (CAN) and Ethernet-based TCMS data communication interfaces (TRDP and CIP)
  • Requirements analysis & shift-left (PTC Windchill ALM): Analysis of software and system artifacts to identify gaps, ambiguities, and redundancies early in the SDLC
  • Test design & test case development: Derivation of test conditions, coverage strategies, and implementation of data-driven test cases (DDT), including reusable test data fixtures
  • CI/CD & automation (Python, PowerShell, Jenkins, SVN): Automation of build, test, and HIL deployment processes as well as integration into CI/CD pipelines
  • Test data & configuration management (XML): Maintenance and adaptation of XML test vectors and system configurations with automated integration into test environments
  • Non-functional testing: Execution of performance and load tests to assess stability and system behavior
  • Agile development & defect management (JIRA, Confluence): Participation in Scrum teams, test coordination, review of test artifacts, as well as defect tracking and root-cause analysis
  • Error analysis & debugging (CANoe, CANalyzer): Analysis of errors and message flows across multiple system layers (application to bus)
  • Model-based analysis (UML, Enterprise Architect): Specification of SUT/SOW and support for systematic test control
  • Process & test documentation: Creation of integration and test documentation according to internal quality and certification requirements

Discover over 15,000 top freelancers

Statistics of experts using Object-Oriented Programming

Aggregated from the professional profiles of matched freelancers.

Experience

22 years

Position duration

3.2 years

Positions per freelancer

15

Top business areas

Information Technology, Product Development, Project Management

Top industries

Information Technology, Banking and Finance, Automotive

Certification focus areas

Information Technology, Product Development, Project Management

Bachelor's degree or higher

90%

Master's degree or higher

59%

Doctorate

8%

Certifications per freelancer

3

Most common languages

German, English, French

Speak two or more languages

96%

Based on our profile pool as of 6 Sep 2026.

Daily rate distribution

0 30 60 90 120
<€400 €400-​800 €800-​1200 €1200-​1600 €1600+

The chart shows how the daily rates of freelancers in this technology 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 using Object-Oriented Programming

Rates are based on recent contracts and do not include FRATCH margin.

800
600
400
200
Rate comparison chart
Daily rate avg. 753 €

The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.

800
600
400
200
Rate comparison chart
Median rate 760 €

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 6 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.

About the technology

Core idea

Object-Oriented Programming, or OOP, organizes software around objects that combine data and behavior. It is used to build business systems, APIs, desktop software, games, and embedded applications that need clear structure and long-term maintainability.

Common patterns

Strong professionals work with classes, inheritance, composition, polymorphism, and encapsulation. They know when to favor simple models over deep inheritance trees, and they keep responsibilities small so code stays readable.

Typical work

  • Design domain models and class hierarchies
  • Refactor tangled legacy code into smaller units
  • Improve testability, reuse, and separation of concerns
  • Review object design in Java, C#, C++, Python, and related stacks

Ecosystem fit

OOP shows up in many mainstream languages and frameworks. In Java, C#, Python, C++, and TypeScript codebases, specialists often work with design patterns, dependency injection, SOLID principles, and unit testing tools that support structured application code.

When to bring in help

Companies usually seek freelance expertise when an existing codebase is hard to extend, when a new product needs a solid object model, or when teams want to reduce duplication and side effects. Strong specialists can work with in-house teams, join remote sprints, or support on-site reviews where hands-on collaboration helps.

What strong experts do

A good OOP professional does more than write classes. They make trade-offs explicit, keep APIs stable, spot where composition beats inheritance, and leave code easier for other specialists to maintain. They also adapt to the team’s language, framework, and release process without forcing one style everywhere.

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Frequently asked questions

Questions about Object-Oriented Programming? Start with the answers below.

Object-Oriented Programming is used to build software that benefits from clear structure, reusable parts, and easy maintenance. It is common in enterprise systems, APIs, desktop tools, games, and many product back ends. Companies usually bring in specialists when they need code that will stay understandable as the system grows.

Object-Oriented Programming centers on objects, state, and behavior, while functional programming prefers immutable data and pure functions. They solve different problems, and many codebases use both. A strong specialist knows when object models help and when a simpler functional approach is cleaner.

Object-Oriented Programming is especially common in Java, C#, C++, Python, and TypeScript projects. It also appears in frameworks and libraries built around classes, services, entities, and layered architecture. The exact stack matters less than whether the codebase depends on sound object design.

Object-Oriented Programming work is stronger when the specialist also understands design patterns, refactoring, testing, and API design. Knowledge of SOLID principles, dependency injection, and clean architecture is often valuable. In real projects, communication with product and engineering teams matters just as much as syntax.

Object-Oriented Programming support becomes useful as soon as a codebase starts to accumulate duplicate logic, fragile inheritance, or unclear module boundaries. Smaller tasks may only need targeted review, while larger rewrites need a specialist who can steer design choices. The right level depends on how much existing code and architecture risk is involved.

Object-Oriented Programming specialists can usually work remotely because most tasks involve code review, design discussion, and implementation in shared repositories. On-site work can help when a team needs intensive architecture sessions or needs to untangle legacy systems quickly. Many companies combine both depending on the project phase.

Object-Oriented Programming quality shows up in the structure of the code, not in fancy terminology. Look for clear class responsibilities, sensible use of composition, practical tests, and the ability to explain trade-offs in plain words. Good specialists leave behind code that other experts can extend without fear.

Object-Oriented Programming freelancers usually ask which language, framework, and codebase style they will work in, plus how much legacy code is involved. They also want to know whether the team expects design guidance, direct implementation, or review of existing work. Clear scope helps them judge whether they can add value quickly.

The average hourly rate of freelancers who have used Object-Oriented Programming in their recent projects is 94 €, which corresponds to a daily rate of about 753 € based on an 8-hour working day.

Of the freelancers who have used Object-Oriented Programming in their recent projects, 90% hold at least a Bachelor's degree, 59% hold at least a Master's degree, and 8% hold a doctorate.

On average, freelancers who have used Object-Oriented Programming in their recent projects have 22 years of professional experience, with a single engagement typically lasting around 3.2 years.

The most common languages among freelancers who have used Object-Oriented Programming in their recent projects are German (98%), English (96%), and French (21%).

The most common industries among freelancers who have used Object-Oriented Programming in their recent projects are Information Technology (95%), Banking and Finance (51%), and Automotive (46%).

The most common business areas among freelancers who have used Object-Oriented Programming in their recent projects are Information Technology (99%), Product Development (91%), and Project Management (62%).

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.

Berlin Hamburg Munich Cologne Frankfurt Stuttgart Dusseldorf Leipzig Dortmund Essen Bremen Dresden Hanover Nuremberg

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