Prolog Experts in Germany
for intelligent systems, matched in minutes with vetted and available freelancersHire experts who design rule engines, knowledge-based applications and constraint-solving systems 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
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
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
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
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
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
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
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
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 “internship travel cost indicator”
- 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
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
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
Jens G.
Last position:
Shijou GmbH
- Software architecture and backend development for a marketplace solution / eCommerce retail
- Used Scala, Python, http4s, Next.js, Elasticsearch, PostgreSQL, AWS
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 19 Sep 2026.
Daily rate distribution
The chart shows how the daily rates of freelancers in this technology in Germany 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 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 19 Sep 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 expresses relationships and lets the runtime search for solutions through unification and backtracking. ISO Prolog defines core language behavior, while implementations add practical tooling.
Systems built with Prolog
Prolog suits problems where rules, relationships and alternatives are central. Companies use it for symbolic reasoning, expert systems, natural-language processing, configuration tools and complex search tasks.
- Rule engines for business or operational decisions
- Knowledge bases and recommendation logic
- Constraint-solving and scheduling applications
- Language analysis and semantic processing
Ecosystem and tooling
SWI-Prolog is a widely used implementation for research and production work, with a strong package ecosystem and web integration options. Other environments include SICStus Prolog, GNU Prolog and systems connected to Python, Java or C through foreign-function interfaces. Strong specialists also work with testing, profiling, module design and deployment automation.
When freelance expertise helps
Companies often bring in a Prolog specialist when a rule-heavy prototype must become a reliable product, or when an existing knowledge system needs modernization. External expertise can also help translate domain rules into maintainable predicates, connect Prolog with existing services and document reasoning behavior for internal teams. In Germany, remote collaboration is common, while regulated or domain-heavy projects may still benefit from on-site workshops and German-language communication.
What strong specialists deliver
A capable professional separates domain knowledge from control logic and makes inference paths understandable. They know when declarative rules are a better fit than procedural code, and when another technology should handle data storage, user interfaces or high-throughput processing. Useful deliverables include tested predicates, explainable rule models, integration services, performance reviews and clear handover documentation.
Choosing the right fit
Look for evidence of shipped systems rather than familiarity with syntax alone. The right specialist can explain search complexity, termination, cuts, negation, modules and constraint logic programming in practical terms. They should also be comfortable reviewing requirements with subject-matter experts and connecting Prolog to APIs, databases, CI pipelines and the languages already used by your team.
Frequently asked questions
The facts hiring teams ask for most often when it comes to Prolog.
Prolog is used for rule engines, expert systems, knowledge bases, language processing, planning and constraint-solving applications. It is especially useful when a product must represent relationships and explore possible solutions rather than follow a fixed sequence of steps.
Prolog expresses facts, rules and queries, while Python and Java usually rely on more explicit control flow and data structures. Prolog can make symbolic reasoning concise, but Python or Java may be a better fit for broad application frameworks, user interfaces and high-volume services.
Prolog work often connects with constraint logic programming, natural-language processing, ontologies and knowledge representation. Useful adjacent skills include SWI-Prolog packages, SQL, REST APIs, Python, Java, testing and deployment in mixed-language systems.
Prolog projects need enough practical experience to model rules clearly, control search and prevent unwanted recursion or non-termination. A small prototype may need focused language expertise, while a production system also calls for integration, testing, profiling and maintainable architecture.
Prolog specialists can collaborate remotely through repositories, tests, design sessions and documented rule models. For German teams, clarify the expected working language, time-zone overlap and whether domain workshops or reviews require occasional on-site attendance.
SWI-Prolog is a strong choice when a project needs a mature open-source implementation, package support, debugging tools and integration with external services. The decision should still consider deployment constraints, required libraries, team familiarity and long-term maintenance.
Prolog quality is visible in readable predicates, explicit domain models, predictable termination and tests that cover both valid and invalid cases. Ask for a walkthrough of the inference process and how the specialist measures performance as the knowledge base grows.
ISO Prolog describes standard language behavior, while SWI-Prolog is a concrete implementation with extensions, libraries and development tools. A strong specialist knows which parts are portable and documents implementation-specific choices before they affect future migration or maintenance.
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
