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Freelance GPT-4 specialists
Check out freelance GPT-4 specialists on Upwork, with the skills you need for your next job.
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Mayank L.
Indore, India
5y+ in AI / ML | trying to fix GEN AI and RAG related problems | not perfect but versatile
I have experience in design and development of ai based applications in fast paced environments. I have previously worked with startups working on innovative projects. Looking forward to working with you.
- Natural Language Processing
- Computer Vision
- Keras
- Chatbot
- Deep Learning
- Machine Learning
- Python
- ChatGPT
- GPT-3
- FastAPI
- API
- Software Development
- API Development
- Retrieval Augmented Generation
- Generative AI
Tom V.
San Francisco, United States
I'm Tom, a specialist in AI-powered business automation focusing exclusively on enterprise and growth-stage companies. I help leadership teams transform their operations by implementing secure, scalable automation solutions that deliver measurable ROI within 90 days.
My expertise centers on creating custom automation systems for:
• Complex approval workflows
• Document processing and data extraction
• Secure data handling and compliance
• Rapid prototyping for POC and pilot projects
Typical client results include:
• 70% reduction in manual data entry
• 85% faster document processing
• $100K+ annual cost savings
• 98% accuracy in automated workflows
I specialize in private, secure implementations where sensitive data never leaves your control. My solutions are built for scale, ensuring your automation investment grows with your business.
Investment levels:
• Strategic projects starting at $15,000
• Monthly retainer: $7,500
• Hourly consultation: $147
I selectively take on 2-3 clients per quarter to ensure dedicated attention and exceptional results. Let's discuss how automation can transform your operations if you're looking for a strategic partner rather than just a developer.
Note: I typically respond to inquiries within 3 hours during business hours (PST).
- GPT-3
- TypeScript
- ChatGPT
- JavaScript
- Vue.js
- Node.js
- Dialogflow API
- Alexa Skills Kit
- ManyChat
- Svelte
- Amazon Lex
- Chatbot Development
- GPT-J
- Dialogflow
Hanane L.
Rueil-Malmaison, France
I help companies solve hard problems with smart data and AI architecture - designing scalable systems, automating decisions, and making complex data usable across teams.
With 14+ years of experience between France and Morocco, I bring a unique mix of data engineering, ML, and software integration. I’ve led projects in banking and analytics, built document-generation agents using OpenAI & LLaMA, and architected end-to-end ETL pipelines using Airflow, Hive, Postgres, and S3-like lakes.
🔹 My specialties:
• Generative AI & RAG Systems (OpenAI, LLaMA, LangChain)
• Data Platforms & Orchestration (Airflow, Python, Nutanix, Hive)
• API Integration & Automation (internal + external APIs for financial and operational systems)
• Problem Solving & Solution Architecture – designing clear, maintainable, and impactful systems
I’ve built AI tools for document intelligence, dashboards for financial indicators, and ingestion pipelines for economic datasets. Every project I take on is grounded in reliability, traceability, and results.
Let’s work together if you’re looking for a hands-on senior consultant who can design, build, and deliver high-value AI/data system …fast.
- pandas
- SQL
- Python
- Natural Language Processing
- GPT-3
- XML
- Data Visualization
- Data Engineering
- Data Analysis
- Jupyter Notebook
- XSLT
- spaCy
- Microsoft Visual Studio
- Microsoft Excel
- MySQL
Dawid N.
Police, Poland
I help founders build AI projects in under 1 week—so you can start monetizing it immediately. Succesfully delivered over 30+ projects on Upwork alone! 100% 5-star reviews.
What my clients say about me:
🏅 "Dawid was able to build the AI proof of concept I needed, in the (short) timeframe I needed it done, and exceeded all my expectations!" - Delivered the app in less than 4 days.
🏅 "Dawid was able to build out an MVP for us so we could confirm if our idea was possible." - Built the proof of concept in less than 4 days.
🏅 "It was a pleasure working with Dawid. He was able to bring our AI idea to life." - Build AI fullstack MVP in one week!
If that sounds like you:
❌ "I have an app idea, but I don't want to spend 6 months building it"
❌ "I don't need a perfect solution for now, I need to see whether there's demand"
❌ "I don't know whether my idea is even possible, I want to find out"
I can help you by:
✅ Building you a basic version of your app in less than 1 week.
✅ Building ONLY required features to see whether there's demand.
✅ Validating whether your idea is possible given the current state of AI.
I've worked for various industries like: Education, Ecommerce, Finance, Coaching, SaaS. For diffrent clients: B2B, B2C.
Here are some of my stats:
📈 100% 5-star reviews - TOP RATED PLUS(top 3% of Upwork) - 100% Job success score
📈 6+ years of programming experience.
📈 Worked on over 60+ projects(30+ Upwork alone!). For various clients: solo founders, startups, and Fortune 500 companies.
Working with me, you will:
🎉 See progress updates EVERY DAY!
🎉 Be able to contact me via my personal email/phone 24/7.
🎉 Get your money back, if I won’t deliver you the desired results.
My work with AI includes:
🤖 Building RAG based AI chatbots.
🤖 Finetuning hugging face and OpenAI models.
🤖 Adding agentic capabilities: Web search, using custom APIs.
I use these technologies: NextJS/Supabase/Vercel
SOUND LIKE A FIT? NEXT STEPS:
Click the green ‘Invite to Job’ button in the top right-hand corner, send me a message and let’s organize a call!
I have experience building with the following APIs and technologies:
• Text AI: OpenAI API, Claude/Anthrophic API, Google Gemini API, Azure OpenAI, Hugging face
• Voice AI: ElevenLabs, Whisper API, OpenAI Realtime Voice, Play.ai, Vapi, Deepgram, PlayHT
• Authorization: Auth0, Clerk, AuthJS
• Payments: Lemonsqueezy, Stripe
• Web: NextJS, React, ShadcnUI, TypeScript, HTML, CSS, Tailwind.
• API: NodeJS, Python, FastAPI,
• Coding tools: Lovable, v0, Cursor, Windsurf, Bolt
• Automation: N8N
Keywords: AI prototyping, fast AI development, MVP development, prototype AI development, Fullstack development, AI agents development, custom agentic workflows.
- ChatGPT
- API Integration
- API
- Web Development
- JavaScript
- Web Application
- React
- Front-End Development
- Node.js
- Stripe API
- Google Maps API
- Next.js
- GPT-3
- GPT-4
Husnain Q.
Mansehra, Pakistan
🔹 Senior Full Stack JavaScript Engineer | React, Node.js, Fintech Expert
I'm a results-driven Full Stack Engineer with 6+ years of experience delivering secure, scalable web and mobile applications—especially in fintech and payment systems. I specialize in building robust solutions using React.js, Next.js, Node.js, NestJS, TypeScript, and React Native, backed by solid knowledge of infrastructure tools like Kafka, Redis, Docker, and AWS.
Having led major projects for clients in Canada, the US, and Europe, I’ve successfully launched 75+ apps via Upwork, Fiverr, and Turing—earning consistent 5-star ratings and Top Developer status.
✅ Expert in RESTful APIs, microservices, and payment integrations (PCI-DSS compliant)
✅ Skilled in building real-time systems and modern UIs
✅ Strong background in DevOps, CI/CD, and scalable system design
✅ Proven leadership mentoring junior developers and leading architectural decisions
Let’s build something impactful—secure, fast, and user-friendly.
- ChatGPT
- React
- Node.js
- React Native
- Bug Fix
- MongoDB
- GPT-3
- ExpressJS
- API Integration
- JSON
- TypeScript
- JavaScript
- NodeJS Framework
- Regex Writing
- API
Nicolas G.
Paris, France
Hi there! My name is Nicolas, and I specialize in AI-powered automations and scripting for inbound and outbound workflows.
I excel in using tools like Make.com, Vapi.ai, Airtable, Python, Javascript, n8n, Zapier, Flowise, OpenAI, Go High Level (API V2), and more to create advanced assistants that handle cold calling, lead qualification, appointment booking, and client engagement.
My expertise includes:
- Building AI Assistants for cold calls that qualify leads, send follow-up emails, and transfer qualified leads to sales agents or schedule meetings.
- Designing Inbound Assistants capable of remembering client details, answering questions, transferring calls to the right department, and booking meetings directly into calendars.
- Integrating no-code and low-code platforms with hidden APIs to automate complex workflows and manage appointments.
Whether you're looking to optimize communication, reduce manual tasks, or create smart assistants for your business, I provide tailored solutions to meet your needs.
You can check my portfolio so you can see real projects that I've been creating for some clients.
Let me know If you need my help!
- GPT-3
- GPT-4
- Gemini
- Natural Language Generation
- Hugging Face
- Prompt Engineering
- Large Language Model
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Summa Linguae