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What is Prolog?

Prolog is a powerful logic programming language ideal for developing artificial intelligence applications and handling tasks involving symbolic reasoning and natural language processing. It's perfect for building expert systems, complex algorithms, and data analysis tools in computational linguistics. Whether you're working on AI development, creating chatbots, or processing linguistic data, a skilled Prolog Developer can make your project a reality.

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Live Experts ®

4.9

354

9.2

99%

Daska, Pakistan

$50 USD per hour

Live Experts LLC is a multidisciplinary technology company specializing in Engineering, AI/ML, Embedded Systems, IoT, and Automation Solutions for startups, businesses, and enterprises worldwide. With over a decade of technical delivery experience and hundreds of successfully completed projects, we help clients transform complex ideas into scalable, production-ready solutions that solve real business and operational problems. Our strength comes from combining software, AI, automation, electronics, and engineering expertise under one team. This allows us to handle both digital systems and real-world hardware projects with practical implementation experience. Our expertise includes: • Artificial Intelligence (AI) & Machine Learning (ML) • Generative AI & Conversational AI • AI Chatbots & AI Agents • Computer Vision & OCR Systems • Predictive Analytics & Data Intelligence • Workflow Automation & AI Integration • Embedded Systems & IoT Solutions • Arduino, ESP32 & Raspberry Pi Development • PLC, SCADA & Industrial Automation • Electrical & Mechanical Engineering Support • Sensor Integration & Smart Monitoring Systems • AI-Powered Dashboards & Business Platforms • Cloud APIs & System Integrations • Automation & Control Systems We work with modern technologies including: Python, OpenAI, ChatGPT, TensorFlow, OpenCV, Node.js, React, FastAPI, PostgreSQL, AWS, Docker, MATLAB, Arduino, ESP32, Raspberry Pi, PLC systems, and industrial automation platforms. What makes us different is our ability to bridge the gap between: AI + Automation + Embedded Systems + Engineering Many companies can build software. Others can build electronics. Very few can combine AI, automation, hardware, and engineering into complete intelligent systems that work in real business environments. We have experience working across: • Industrial Automation • Healthcare • Logistics & Fleet Systems • Manufacturing • Finance & Trading Systems • Smart Monitoring Systems • Operational Dashboards • IoT & Connected Devices • AI Business Solutions • Intelligent Automation Platforms Our development approach focuses on: • practical implementation • scalable architecture • clean UI/UX • reliable integrations • business-focused solutions • long-term maintainability • clear communication • premium execution quality Whether you need: • an AI-powered platform • an embedded IoT device • industrial automation • computer vision systems • AI automation workflows • predictive analytics dashboards • AI chatbots • sensor-based monitoring systems • electrical/mechanical engineering support • or a complete intelligent system Live Experts can help design, develop, and deploy reliable solutions tailored to your business goals. We believe in building long-term partnerships and delivering systems that create measurable operational and business value.

Prolog PHP Perl C Programming Java

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TechPlus

4.8

491

8.6

88%

lahore, Pakistan

$25 USD per hour

I am a software developer with 490+ completed projects on Freelancer, helping businesses build, improve, and integrate software that solves real business problems. My work focuses on custom web applications, API integrations, automation, business systems, and existing application enhancements. Whether it's connecting third-party services, automating repetitive workflows, fixing complex issues, or adding new features to an existing system, I focus on delivering practical, reliable solutions. What I Can Help With • API integrations and third-party services • Business automation and workflow development • CRM integrations and custom business tools • Web applications and admin dashboards • AI integrations and automation solutions • Payment gateway integrations • Data processing, reporting, and import/export tools • Bug fixing, maintenance, and feature development Technologies PHP, Classic ASP, ASP.NET, C#, Python, JavaScript, MySQL, SQL Server, WordPress, Shopify, REST APIs, Google APIs, OpenAI, Stripe, PayPal, Twilio, Make.com, n8n, Google Sheets, and other business integrations. I enjoy working on projects that involve solving technical challenges, integrating different systems, and improving existing software. I believe in clear communication, realistic timelines, and writing maintainable code that clients can continue to build upon. If you're looking for someone who can understand your requirements, troubleshoot complex issues, and deliver reliable solutions, I'd be happy to discuss your project.

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Modular solutions

5.0

119

8.1

97%

SIALKOT, Pakistan

$50 USD per hour

Modular Solutions delivers advanced Engineering, AI/ML, Embedded Systems, and IoT solutions for startups, enterprises, researchers, and industrial clients worldwide. We transform complex ideas into production-ready systems — from AI platforms and automation tools to embedded hardware, enterprise software, industrial controls, simulations, and engineering designs. Our expertise combines Artificial Intelligence, Machine Learning, Computer Vision, Deep Learning, Data Science, Analytics, and Automation with strong software engineering capabilities in Python, C/C++, Java, C#, .NET, PHP, JavaScript, SQL, MATLAB, Simulink, and Linux-based systems. On the hardware side, we specialize in Embedded Systems, IoT Devices, FPGA/Verilog/VHDL, PCB Design, Raspberry Pi, Arduino, ARM development, RF systems, electronics, firmware, industrial automation, sensor integration, DSP, and hardware/software interfacing. We also provide Mechanical, Electrical, Civil, and Structural Engineering services including AutoCAD, Civil 3D, SolidWorks, CAD/CAM, Product Design, 3D Modelling, Simulation, Renewable Energy systems, and technical feasibility analysis. Our experience includes: • AI-powered analytics and automation platforms • Facial Recognition and OpenCV systems • Enterprise SaaS and backend platforms • Industrial automation and control systems • FPGA and embedded hardware development • MATLAB/Simulink modeling and simulation • IoT evaluation and sensor systems • CAD drafting and engineering design • Unity 3D and simulation applications • Data analytics and statistical analysis • Research, technical writing, and documentation We also support clients with Project Management, Business Analysis, Finance, Accounting, Bookkeeping, QuickBooks reconciliation, Reporting, Scientific Research, Research Writing, Technical Writing, and enterprise consulting. Our technical stack and domains include: AI & Machine Learning | Deep Learning | Neural Networks | Computer Vision | OpenCV | Data Science | Big Data | Statistical Analysis | SPSS | R Programming | Python | MATLAB | Simulink | Algorithm Development | Data Mining | Text Mining | C Programming | C++ | Java | C# | PHP | JavaScript | SQL | .NET | Software Architecture | Linux | Web Development | Electronics | Electrical Engineering | FPGA | Verilog/VHDL | Embedded Systems | IoT | Arduino | Raspberry Pi | ARM | PCB Design | RF Communications | DSP | CAD/CAM | AutoCAD | SolidWorks | Mechanical Engineering | Civil Engineering | Structural Engineering | Product Design | 3D Modelling | Unity 3D | Technical Writing | Research Writing | Project Management | Finance | QuickBooks | Business Analysis Clients choose Modular Solutions for strong communication, fast execution, technical depth, and the ability to solve complex engineering and software challenges under tight deadlines. We focus on delivering reliable, scalable, and production-ready solutions tailored to each client’s goals.

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Kashif

5.0

6.0

98%

Faisalabad, Pakistan

$25 USD per hour

I am an experienced Full Stack Developer whose expertise is in website development and Mobile Development via Ruby , Ruby on Rails, Nextjs, MERN, React and React Native. I have both backend and frontend capabilities, creating full scale sites that are functional, modern, and easy-to-use. While I specialize in Ruby, this is by no means a limit to my abilities. My technical skills include (but are not limited to): ● Ruby / Ruby on Rails, Nodejs ● HTML4 / HTML5 / HAML / SLIM / JavaScript / jQuery / CoffeeScript ● CSS3 / SASS / LESS / BOOTSTRAP / Foundation ● Database (MySQL / PostgreSQL / MongoDB) ● ReactJS, React Native, AngularJS, NextJS ● NGINX / Apache ● Capistrano ● AWS / Digital Ocean / Heroku I can handle many different programming languages, and even have the knowledge to develop mobile apps on iOS and Android, and can handle server management and configuration tasks. My software tool chest runs deep, including Ubuntu, Slack, Jira and Trello (to name a few), so feel free to let me know if there are any software specifics you need me to implement. Beyond all that, I’m a professional. Timely, Communicative, and focused on the task at hand at all times, I’m the Developer you need if you want things done right the first time, on time. So, thank you for stopping by, and if you’re interested, don’t hesitate to message me. I can’t wait to work with you in the near future!

Prolog PHP Java XML Data Processing

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Clients rate our Prolog Developers

4.84 out of 5

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How to hire a great freelance Prolog Developer

A Prolog developer is a logic programming specialist who builds applications using Prolog, a declarative language designed for symbolic reasoning, rule-based systems, knowledge representation, and artificial intelligence problem-solving. Hiring a Prolog developer gives you access to a niche skill set ideal for projects involving expert systems, natural language processing, constraint solving, theorem proving, and computational logic where conventional procedural languages fall short.

What does a Prolog developer do?

Prolog developers translate complex business logic, relationships, and rules into facts, predicates, and Horn clauses that the Prolog inference engine can query and resolve. Rather than writing step-by-step procedures, they describe the problem domain and let the language's built-in unification and backtracking mechanisms compute answers.

This approach is particularly powerful for problems with intricate rule sets, recursive structures, or combinatorial search spaces. A skilled Prolog programmer reduces hundreds of lines of imperative code to concise logical specifications that are easier to verify, audit, and extend.

Core deliverables from a freelance Prolog programmer

The work of a Prolog consultant spans research-grade prototypes through production logic engines. Common deliverables include:

Expert systems and rule-based decision engines for diagnostics, compliance, and recommendation logic

Knowledge bases and ontologies modelled with predicates, facts, and inference rules

Natural language processing components using Definite Clause Grammars (DCGs) for parsing and semantic analysis

Constraint logic programming (CLP) solvers for scheduling, resource allocation, planning, and optimisation problems

Theorem provers, automated reasoning modules, and formal verification tooling

Game AI, puzzle solvers, and combinatorial search algorithms

Integration layers exposing Prolog logic to web applications via REST APIs, FFI bindings, or embedded interpreters

Database querying and deductive database design where logical inference complements SQL

Refactoring, debugging, and performance tuning of existing Prolog codebases

Tools, dialects, and frameworks Prolog experts use

Prolog is not a single monolith — it has multiple dialects with distinct extensions. A capable Prolog developer chooses the right environment for the job:

SWI-Prolog, the most popular open-source implementation, with strong web libraries and Pengines for distributed querying

SICStus Prolog for commercial-grade constraint programming and embedded deployment

GNU Prolog, YAP, and Ciao for performance-sensitive or research workloads

Tau Prolog and SWISH for browser-based and JavaScript-integrated applications

CLP(FD), CLP(R), and CLP(B) constraint libraries for finite domain, real, and Boolean reasoning

Logtalk for object-oriented logic programming on top of Prolog

Foreign-language interfaces to C, C++, Java, and Python for hybrid systems

Adjacent skills that often accompany Prolog work include Datalog, Answer Set Programming (ASP), Mercury, Lisp, Haskell, OWL/RDF semantic web technologies, SPARQL, and formal methods such as Coq or Isabelle.

Industries that hire Prolog developers

Demand for Prolog specialists is concentrated in domains where logical correctness, explainability, and rule-based reasoning carry commercial weight:

Healthcare and clinical decision support, where diagnostic rules must be auditable

Legal tech, regulatory compliance, and policy reasoning systems

Finance and insurance, for underwriting rules, fraud detection logic, and risk assessment

Aerospace, defence, and industrial scheduling, where constraint solvers plan complex resources

Telecommunications and network configuration validation

Academic research, computational linguistics, and AI laboratories

Bioinformatics and knowledge graph engineering

How to evaluate a Prolog developer

Because Prolog is a specialist language, candidate quality varies widely. Look for evidence of formal computer science training, demonstrated experience with at least one major dialect, and a portfolio that includes non-trivial logic programming work — not just textbook exercises.

Strong portfolio markers include published expert systems, contributions to open-source Prolog libraries, CLP-based optimisation projects, NLP grammars written in DCGs, or integration work bridging Prolog with mainstream stacks. Pay attention to how candidates discuss cut, negation as failure, tabling, and indexing — these reveal depth.

Sample interview questions you can use directly:

Can you walk me through how you would model this domain as facts and rules, and explain why you chose that representation?

How do you handle the difference between logical negation and negation as failure in production code?

When would you reach for CLP(FD) instead of pure Prolog backtracking, and what trade-offs are involved?

How do you debug a non-terminating predicate, and what tools do you use to trace and profile execution?

Describe a time you integrated Prolog with another language or system — what interface did you use and what challenges came up?

Why hire Prolog developers on Freelancer.com

Prolog talent is rare in the general developer pool, which is why a global marketplace matters. Freelancer.com connects you with logic programming specialists across academia and industry, from universities with strong AI traditions to seasoned consultants who have shipped expert systems for regulated industries.

You can post a project on Freelancer.com and receive competitive bids from Prolog developers worldwide, compare portfolios side by side, and review verified ratings before committing. Clients set their own budgets, and Milestone Payments hold funds securely until agreed deliverables are approved. Whether you need a quick proof of concept or a long-term knowledge engineering engagement, freelancers on Freelancer.com cover the full spectrum of logic programming work.

Post a project on Freelancer.com today and connect with skilled Prolog developers ready to build the logic engine, expert system, or constraint solver your project needs.

What are the steps to hiring a freelance Prolog developer?

Hiring a Prolog developer works best when you start with a precise description of the logical problem you want solved. Because logic programming is a specialised craft, a sharp brief attracts the right candidates and filters out generalists who lack the depth. The process below takes you from project posting to award.

Step 1: Post your project on Freelancer.com

Your brief is the single biggest determinant of bid quality. For a Prolog project, name the dialect you prefer, describe the rules or domain you need modelled, and indicate whether you need integration with another language or runtime. Head to the post project page , fill in the scope, timeline, and budget, then publish the project for freelancers to bid on.

Preferred Prolog dialect (SWI-Prolog, SICStus, GNU Prolog, Tau Prolog, or developer's choice)

Domain context and the rules, facts, or constraints you need modelled

Whether you need CLP, DCGs, tabling, or other specific Prolog features

Integration requirements — REST API, embedding in C/Java/Python, web deployment

Expected deliverables, such as source code, test cases, documentation, or a knowledge base

Timeline, milestones, and indicative budget range

Step 2: Review bids from freelancers

Bids on a Prolog project are short proposals revealing how each candidate interprets your logic problem. Read past the price line and look for proposals that demonstrate genuine engagement with the domain — references to specific predicates, suggested data structures, or questions about edge cases in your rules. A strong proposal often raises issues you had not considered.

Clarity of approach: does the freelancer describe how they would model your domain in clauses?

Relevant clarifying questions about negation, determinism, or expected query patterns

Realistic timeline given the rule base size and integration complexity

References to appropriate tools — CLP libraries, Logtalk, foreign-language interfaces

Sample Prolog code or links to repositories showing similar work

Use Freelancer.com chat to ask shortlisted candidates a small technical question and gauge their thinking

Step 3: Evaluate freelancers and award the project

Final evaluation combines proposal quality with profile evidence. Look beyond a single impressive sample and judge consistency — repeated logic programming, AI, or formal methods projects signal genuine specialisation. Written client reviews often reveal how a freelancer handles ambiguous rule definitions and iterative refinement.

Portfolio depth in Prolog, Datalog, ASP, or related logic languages

Star rating and number of completed projects in adjacent areas (AI, NLP, optimisation)

Detailed written reviews, especially mentions of correctness, documentation, and communication

Verified payment method and identity

Project completion rate and on-time delivery rate

Award the project and use Freelancer.com Milestone Payments to release funds as each deliverable is accepted, protecting both sides during the engagement

What kind of projects is Prolog actually suitable for?

Prolog excels at problems involving symbolic reasoning, rule-based logic, parsing, constraint satisfaction, and knowledge representation. It is a strong choice for expert systems, planners, NLP front-ends, and verification tools, but generally not the right pick for high-throughput web backends or numerical computing.

Can I hire a Prolog developer for a one-off project?

Yes. Many Prolog specialists take on short engagements such as building a single rule engine, porting legacy Prolog code to a modern dialect, or prototyping a constraint solver. You can scope a fixed-deliverable project and award it to a single freelancer through Freelancer.com.

What's the difference between a Prolog developer and a general AI engineer?

AI engineers typically focus on machine learning models, neural networks, and statistical methods. Prolog developers work in symbolic AI — explicit logic, rules, and inference. The two approaches solve different problems, and increasingly hybrid systems combine both, so some freelancers offer expertise across symbolic and statistical AI.

Do I need a Prolog developer or a Datalog or ASP specialist?

If your problem is pure querying over a deductive database, Datalog may be simpler. If you need optimisation and combinatorial search with elegant non-monotonic reasoning, Answer Set Programming may fit better. Many Prolog freelancers work across these related logic languages and can advise on the best tool for your use case.

How long does a Prolog project typically take?

A focused prototype or rule engine can take a couple of weeks, while a full expert system with integration, testing, and documentation often runs over several months. Timelines depend on domain complexity, the size of the rule base, and integration requirements with existing systems.