OpenAI Developer for Hire

OpenAI Developer — GPT-4, Assistants API, LangChain & Production AI

I integrate OpenAI into your product, workflow, or backend — from simple GPT-4 completions to stateful Assistants with file search, code interpreter, and custom function calling. Production-ready, deployed on AWS.

GPT-4oAssistants APIFunction CallingRAG SystemsLangChainFastAPI100% Job Success
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30+
AI Integrations Shipped
100%
Job Success on Upwork
5.0★
Client Rating
3+
Years OpenAI Experience
What I Build

OpenAI integrations that power real business workflows

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GPT-4 Chat Integrations

Add GPT-4 chat to your web app, API, or internal tool. Custom system prompts, conversation history, streaming responses, and content moderation — built with FastAPI or Django backend.

GPT-4oFastAPIStreaming
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Assistants API & File Search (RAG)

Upload your documents (PDFs, CSVs, contracts) to an OpenAI Assistant and let it answer questions from your knowledge base. Ideal for support bots, document Q&A, and research tools.

Assistants APIFile SearchRAG
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Function Calling & Tool Use

Connect GPT-4 to real tools — CRM APIs, databases, web search, custom services. The model calls the right function, gets the result, and reasons over it to complete multi-step tasks.

Function CallingTool UseAPIs
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Classification & Extraction

Use GPT-4 to classify emails, tickets, leads, or documents — extract structured data from unstructured text, normalize addresses, parse invoices, and categorize content at scale.

Structured OutputClassificationExtraction
✍️

AI Content Generation

Auto-generate personalized emails, product descriptions, legal summaries, or reports using GPT-4 — with brand voice prompts, variable injection, and output validation to ensure quality.

GPT-4oTemplatesn8n
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Production AI Deployment

Deploy OpenAI-powered APIs to AWS Lambda, EC2, or ECS — with rate limiting, cost monitoring, error handling, and async processing via Celery + Redis for high-volume workloads.

AWSDockerFastAPICelery
FAQ

OpenAI development questions

Which OpenAI model should I use for my project?

GPT-4o is the best default for most applications — fast, multimodal, and highly capable. GPT-4o-mini is ideal for high-volume, cost-sensitive tasks (classification, extraction). The Assistants API (with file search) is best for document Q&A. I recommend the right model based on your latency, cost, and capability requirements.

Can you build a RAG system from my documents?

Yes. I build RAG (Retrieval Augmented Generation) systems using either OpenAI's native file search (simplest) or custom vector stores with pgvector or Pinecone (more control). The system lets GPT-4 answer questions about your specific documents — contracts, knowledge bases, product docs, legal filings — with source citations.

How do you control OpenAI API costs?

I implement: prompt compression (summarizing conversation history instead of sending full context), model routing (cheap model for simple tasks, expensive model only when needed), response caching (store identical query results), and cost monitoring via usage tracking and budget alerts. Most clients see 40–70% lower API costs vs a naive integration.

Can you integrate OpenAI into n8n or Make.com?

Yes — and this is often the most cost-effective approach. n8n has native OpenAI nodes for completions, embeddings, and AI agents. For more complex requirements, I build a FastAPI endpoint that n8n/Make.com calls via webhook — giving you full control over the OpenAI integration with no node limitations.

Let's Build

Ready to integrate OpenAI into your product?

Book a free 30-minute call. I'll assess your use case and give you a fixed-price quote for the integration.