Prolog Experts in Germany
for intelligent systems, matched in minutes with vetted and available freelance specialistsHire experts who build rule-based systems, knowledge bases and language-processing solutions with Prolog, SWI-Prolog and related logic-programming tools. FRATCH matches you quickly and precisely with vetted, available freelancers.
Meet FRATCH Experts in Germany, who have recently used Prolog
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
Thorsten L.
Last position:
Senior Security Analyst
- Analysis and remediation of security vulnerabilities in a risk assessment system for energy trading
- System analysis
- Threat modeling
- Decision-making on vulnerability mitigation strategies
- Implementation of vulnerability detection mechanisms
- Security scans
- DevSecOps practices
- Technical environment: Visual Studio Code, JetBrains Suite, MS Threat Modeling Tool, DevSecOps, Git, AWS, DynamoDB, SQL Server, Endur, Snowflake, Orca
- Languages: C#, JavaScript, TypeScript, Python, PowerShell, Bash, Terraform, SQL
Knud W.
Last position:
Lead Programmer, Architect and Deputy Product Owner at Bundesagentur für Arbeit
- Lead programmer, architect and deputy product owner
- Completed transition from zPDV to STEP
- Ensured quality of C++ and Perl sources through automated and manual checks
- Supported resolution of incidents and errors in testing
- Implemented batch for supplementary assignment of payment run numbers
- Implemented batch for distribution of SGB 2 information to the central payment unit
- Supported replacement of Solaris with Linux
- Upgraded gcc from 7.4 to 9.3
- Programmatically generated Makefiles from Borland projects for builds
- Extended funding data with new attribute “Kennzeichen Fahrtkosten Praktikum”
- Programmatically generated XSD and WSDL files from IDL definitions
- Represented the product owner when needed
- Implemented batch for one-time payment processing
- Developed generator for Liquibase files
- Implemented and maintained regular anonymization of production data
- Supported migration from SLES 12 to SLES 15
- Supported introduction of mutual TLS
- Implemented batch for sending deletion impulses to EDA BE
- Organized script directory structure
- Investigated potential introduction of String-Latin and implemented minimal solution
- Remediated security findings identified by CheckMarx
- Supported PAP recalculations and general change notices
- Converted ERP interfaces from SOAP to REST
- Planned technical and business topics such as register modernization, cash register security, training costs, four-eyes principle
Adem S.
Last position:
IT Consultant (Test Manager) & CEO at Trikolon Consulting GmbH
- Development and implementation of test concepts for complex, multi-layered systems
- Creation of regular management reports and presentations for stakeholders and clients
- Technical and disciplinary leadership of international test teams (coordination, coaching, resource planning)
- Responsibility for quality assurance across multiple test levels (unit, integration, system, and acceptance tests)
- Design of test cases and test plans in Azure DevOps; ensuring traceability and coverage
- Use of BDD approaches (Gherkin/Cucumber) to prepare test automation
- Building a test automation architecture with Playwright and integrating new tests into CI/CD pipelines
- Performing API tests (REST) and tests for mobile/PWA applications
- Setup and maintenance of test environments across multiple stages (integration, QA, UAT, pre-production)
- Test data management (synthetic and production-like data), ensuring consistency and reproducibility
- Collaboration with DevOps teams for containerization (Docker/OpenShift) and CI/CD integration
- Working under SAFe & Scrum, closely coordinating with product owners and DevOps teams
- Active participation in PI plannings, sprint reviews, and retrospectives
- Promoting an agile QA culture through coaching and knowledge sharing
- Introducing scalable test automation with Playwright → significant reduction of manual testing efforts
- Increasing test transparency through clean defect and reporting management in Azure DevOps
- Improved release quality through an end-to-end QA strategy and automated regression tests
- Strategic leadership of Trikolon Consulting GmbH and responsibility for finance, personnel, and business development
Peter N.
Last position:
Pilot testing AI tools & sabbatical for house renovation
- Pilot testing local AI environments to explore local AI use cases and cloud-based AI solutions
- Evaluation of AI tools and techniques
- Use of local AI tools with own data sovereignty
- Prompt engineering
- Creation of example environments for speech-to-text, text-to-speech, text-to-image, text-to-video, and image-to-video
Tools: Grok, Perplexity, ChatGPT, Elevenlabs, Github, Ollama, HuggingFace, Open WebUI, Faster Whisper, LibreTranslate, WSL, Docker Desktop, Shotcut, Audacity, Sound eXchange, Ffmpeg, Coqui TTS, Pinokio, Stable Diffusion Web UI, ComfyUI, OWL, Void Editor
Vitor R.
Last position:
Test Coordinator Automation at Pro4all
- Designed and built from scratch the automation framework using Playwright, Typescript, JavaScript, Gherkin, Cucumber, BDD, Maven, IntelliJ IDEA
- Defined, developed and maintained test plans, test scripts, reports and other QA documentation in Confluence
- Created and maintained test data with SQL Server Management Studio, Toad and Faker.js
- Performed web services and API testing using Swagger Open API, SoapUI, JSON, HTML and XML
- Executed functional, smoke, regression, black box, GUI, cross-browser, UAT and E2E testing using CrossBrowserTesting and Safari Web Inspector
- Integrated and maintained automated scripts within sprints following Kanban, CI/CD, GitHub, Docker, Azure Pipelines, Agile, Scrum, Kafka and Kibana
- Raised and managed defects in Azure DevOps
- Conducted mobile testing with Robot Framework and Appium
Albrecht N.
Last position:
Senior Project Manager IT at HAYS Technology Solutions GmbH
- Leasing, lifecycle and process management for Apple iPhones, maintenance and expansion of the MDM system, coordination of leasing, device integration into DEP and MDM, followed by a rollout and hardware swap process, plus a BYOD and Android option
- Migration of the IT ticket system from ManageEngine ServiceDesk Plus to Atlassian Jira Service Management: project management, definition of ticket types, seamless execution according to a detailed timeline, user communication, decommissioning of the old system
- Project lead: SAP interface in workforce management to automate reading of working hours
- Sub-project lead for inventory software EZO AssetSonar: demand management, software selection, procurement
Andreas E.
Last position:
Consultant at Iteratec GmbH
Wolfgang O.
Last position:
Fullstack Software Developer at Gematik
Development of the frontend of DEMIS (German Electronic Reporting and Information System for Infection Protection)
Technologies: Angular, Typescript, Single-SPA MicroFrontend, Java, Docker, Kubernetes, Postgres, REST
Prototype development of a compiler from HL7 FHIR to AngularFormly
Klaus B.
Last position:
Conversion, expansion and new fit-out of a railway station into a restaurant at ILO-Arts Heidelberg
- Coordination and execution of the conversion, expansion and new fit-out of a railway station into a restaurant
Jürgen B.
Last position:
Database Administrator and Performance Tuning Specialist at ALD Automotive Leasing Deutschland
- Database administration and performance tuning for Oracle databases on AIX 7.1, 7.2 with Oracle 12c and 19c
- Troubleshooting and resolution on RHEL 7
- Automation of operations with UNIX/Linux shell scripts, Perl programs, and PL/SQL
- Planning, preparation, execution, and customer-specific review of changes and upgrades for the LEASMAN and DOXIS applications
- Incident handling including communication with outsourcing service providers and business units
- Data exchange with Data Pump
- Visualization of database content and monitoring results
- Configuration of databases for Debezium and monitoring Debezium activities
- Preparation of Oracle databases for migration to cloud environments
- Implementation and monitoring of NIST requirements in databases
- Automation of release upgrades for the LEASMAN application
- Creation of operations manuals and instructions
- Generation of reports for GDPR information requests
Murilo S.
Last position:
Physicist at UFPR Curitiba
- Conducting research
- Study about interaction radiation with matter
Jan W.
Last position:
Technical Consultant at AI Beratung (KMU)
- Evaluation of RAG for legal advisory (build or buy)
- Evaluation and POC of RAG for an ERP time tracking module
- Consulting on foundation model selection
- Setup AI development environment (eliminating shadow AI)
- AI strategy consulting
- AI-assisted code creation and context engineering make change sets larger
- Strong software engineering expertise, code reviews and safeguarding through pipelines and domain-specific automated test cases
Thomas S.
Last position:
Senior Software Engineer at BTC Business Technology Consulting AG
Henning P.
Last position:
Siemens
- Developed a reporting API with RESTful services and Spring Boot
- LDAP integration
- Migrated services to AWS
- Bootstrap
- Frontend development with Angular 14
- JBoss
- DynamoDB
- S3
- Athena
Discover over 15,000 top freelancers
Statistics of experts using Prolog
Aggregated from the professional profiles of matched freelancers.
Experience
29 years
Position duration
2.6 years
Positions per freelancer
17
Top business areas
Information Technology, Product Development, Project Management
Top industries
Information Technology, Education, Professional Services
Certification focus areas
Project Management, Information Technology, Product Development
Bachelor's degree or higher
77%
Master's degree or higher
38%
Doctorate
8%
Certifications per freelancer
3
Most common languages
German, English, Spanish
Speak two or more languages
88%
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 Germany 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 Germany using Prolog
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.
Prolog 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 (88%)
- Education (53%)
- Professional Services (53%)
- Retail (53%)
- Automotive (47%)
- Banking and Finance (47%)
- Government and Administration (47%)
- Energy (41%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
Logic programming foundations
Prolog is a declarative programming language built around facts, rules and queries. Instead of describing every execution step, a program defines relationships and lets the inference engine search for solutions through unification, recursion and backtracking. This makes Prolog useful when the rules and possible conclusions matter more than a fixed sequence of operations.
Systems built with Prolog
Prolog specialists create software where symbolic reasoning, complex rules or explainable decisions are central. Typical deliverables include:
- Expert systems for diagnosis, configuration and policy checks
- Knowledge bases that connect entities, attributes and relationships
- Natural-language interfaces and grammar processors
- Constraint-solving components for planning and scheduling
- Rule engines for recommendation and decision support
Ecosystem and tooling
The ecosystem includes ISO Prolog implementations and widely used tools such as SWI-Prolog, SICStus Prolog and GNU Prolog. Strong professionals work with modules, libraries, the Prolog debugger, unit testing and foreign-language interfaces. They may connect logic programs to Python, Java, C or web services when a larger application needs a reasoning component.
When companies need specialists
Freelance expertise is valuable when a team must turn domain knowledge into reliable, testable rules or integrate a mature logic component into an existing product. It can also help when a prototype has become difficult to maintain, search performance needs improvement, or business rules require clearer explanations. In Germany, remote collaboration is common, while regulated or workshop-heavy projects may benefit from on-site sessions and German-language communication.
What strong professionals deliver
A capable Prolog professional separates facts, rules and control logic clearly. They choose suitable data representations, understand indexing and search behaviour, and prevent non-terminating or needlessly expensive queries. They also document the reasoning model, create representative tests and explain results to people who know the domain but not the language.
Choosing the right fit
Assess a specialist through a short reasoning task based on your domain, not only through syntax questions. Ask how they would model uncertainty, changing rules, constraints and integration boundaries. Review code for declarative clarity, termination, test coverage and traceability. The best fit can show where Prolog is the right tool, where another language should handle the surrounding application, and how both parts will be operated over time.
Frequently asked questions
The facts hiring teams ask for most often when it comes to Prolog.
Prolog is used for rule-based decision support, expert systems, knowledge representation, language processing and constraint solving. Companies also use it for planning, configuration and recommendation components where relationships and explainable inference are important.
Prolog expresses facts, rules and queries directly, while Python and Java usually require more explicit control flow and data-processing code. Prolog can reduce the code needed for symbolic search, but Python or Java may be a better fit for general application logic, user interfaces and broad library integration.
SWI-Prolog is a common choice for modern projects and offers modules, libraries, debugging and interfaces for external languages. Other relevant implementations include SICStus Prolog and GNU Prolog, with the best choice depending on licensing, deployment needs and existing code.
Prolog work often benefits from knowledge of knowledge graphs, constraint programming, natural-language processing and formal logic. Database design, Python or Java integration, API development, testing and domain modelling are also useful when the logic component sits inside a larger product.
Prolog projects need a specialist who understands the target domain, the inference model and the operational constraints. A small rules prototype may need focused language expertise, while a production system calls for experience with testing, performance, integration, deployment and long-term rule maintenance.
Prolog projects are well suited to remote collaboration when rules, examples and acceptance criteria are documented clearly. German-language workshops may be useful for domain-heavy work, while code reviews, modelling sessions and technical discussions can often take place online in English.
Prolog quality is visible in clear predicates, well-separated domain rules, controlled search and tests that cover both successful and failing queries. Ask the specialist to explain termination, performance, debugging methods and how a domain expert can review or change the rules safely.
Prolog may be a poor choice when the main problem is routine data processing, a large front-end application or a team has no need for symbolic reasoning. A strong specialist should identify those limits and recommend a hybrid design or another language when it will reduce complexity.
The average hourly rate of freelancers in Germany who have used Prolog in their recent projects is 101 €, which corresponds to a daily rate of about 806 € based on an 8-hour working day.
Of the freelancers in Germany who have used Prolog in their recent projects, 77% hold at least a Bachelor's degree, 38% hold at least a Master's degree, and 8% hold a doctorate.
On average, freelancers in Germany who have used Prolog in their recent projects have 29 years of professional experience, with a single engagement typically lasting around 2.6 years.
The most common languages among freelancers in Germany who have used Prolog in their recent projects are German (88%), English (88%), and Spanish (29%).
The most common industries among freelancers in Germany who have used Prolog in their recent projects are Information Technology (88%), Education (53%), and Professional Services (53%).
The most common business areas among freelancers in Germany who have used Prolog in their recent projects are Information Technology (88%), Product Development (71%), and Project Management (71%).
Main locations of FRATCH Experts, who have recently used Prolog
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 Request a free demo
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Philipp Thomaschewski
FRATCH CEO
