You will get a production LLM feature integrated into your web app
Project details
You will get a production-ready LLM feature integrated into your existing web app or SaaS. I can build chat, content generation, summarization, RAG, structured outputs, and agent-style workflows using providers such as OpenAI, Claude, Gemini, or Azure OpenAI.
I handle the practical engineering around the model integration: API routes, prompt design, streaming responses, database wiring, auth-aware behavior, error handling, retries, rate limits, cost controls, and deployment. I can also deploy or optimize the backend on Cloudflare Workers when an edge runtime makes sense.
I am a solo developer with 20+ years of production web experience across Next.js, TypeScript, React, Supabase, PostgreSQL, MySQL, Python, PHP, and Cloudflare. I have shipped full SaaS products end to end, including auth, billing, data workflows, and real LLM features.
This is fixed-price, async-friendly work. After I receive your stack, repo context, and examples of the feature you want, I will provide a clear implementation path and ship clean source code with a written handoff.
I handle the practical engineering around the model integration: API routes, prompt design, streaming responses, database wiring, auth-aware behavior, error handling, retries, rate limits, cost controls, and deployment. I can also deploy or optimize the backend on Cloudflare Workers when an edge runtime makes sense.
I am a solo developer with 20+ years of production web experience across Next.js, TypeScript, React, Supabase, PostgreSQL, MySQL, Python, PHP, and Cloudflare. I have shipped full SaaS products end to end, including auth, billing, data workflows, and real LLM features.
This is fixed-price, async-friendly work. After I receive your stack, repo context, and examples of the feature you want, I will provide a clear implementation path and ship clean source code with a written handoff.
AI Algorithms
Large Language Model, Multimodal Large Language Model, Transformer ModelAI Applications
AI Chatbot, Conversational AI, Natural Language Generation, Natural Language UnderstandingAI Tools
Azure OpenAIAI Models
ChatGPT, GPT-4What's included
| Service Tiers |
Starter
$90
|
Standard
$250
|
Advanced
$500
|
|---|---|---|---|
| Delivery Time | 2 days | 5 days | 14 days |
Number of Revisions | 1 | 3 | 10 |
AI Model Integration | |||
Batch Normalization | - | - | - |
Database Integration | |||
Detailed Code Comments | - | - | - |
Image Upscaling | - | - | - |
MLOps | - | - | - |
Model Deployment | - | - | - |
Model Documentation | - | - | - |
Model Monitoring | - | - | - |
Model Testing & Optimization | - | - | - |
Model Tuning | - | - | - |
Natural Language Processing | - | - | - |
NLP Tokenization | - | - | - |
Pre-Training | - | - | - |
Prompt Engineering | |||
Setup File | - | - | - |
Source Code |
About Fumiaki
Cloudflare Workers / Supabase / Next.js - Production-Grade Web Apps
Yokohama, Japan - 9:58 am local time
What I've built in production (not demos):
- A consumer directory platform with 100K+ profiles, 1M+ monthly pageviews, generating ~$800K annual revenue — as a solo developer
- A RAG-powered natural language search system using pgvector + OpenAI embeddings + Supabase Edge Functions, serving real users daily with sub-second responses
- Cloudflare Workers handling R2 image delivery, geo-blocking, and redirect control in production
- A full CakePHP 2 → Next.js 15 migration (Strangler Fig pattern) with 100K+ records migrated
My core stack:
Next.js 15 (App Router) · TypeScript · Supabase (PostgreSQL, Auth, RLS, Edge Functions, PostGIS) · Cloudflare Workers/Pages/R2 · Stripe · Python · CakePHP 2/3
How I work:
- Fixed-price, async, ship-fast. I use AI-assisted development (Claude Code) to deliver at 2-3x speed.
- JST timezone = your overnight is my working hours. You wake up to completed deliverables.
- 20+ years of hands-on experience. I've done the full cycle: build, scale, monetize, maintain.
Best fit for: Cloudflare Workers setup/debugging, Supabase schema + RLS design, Next.js app development, RAG/LLM integration, CakePHP → Next.js migration, Stripe payment integration.
Steps for completing your project
After purchasing the project, send requirements so Fumiaki can start the project.
Delivery time starts when Fumiaki receives requirements from you.
Fumiaki works on your project following the steps below.
Revisions may occur after the delivery date.
Review, integrate, test, and hand off
I review your app and requirements, design the model/API flow, implement the LLM feature, test edge cases and deployment, then provide a clear written handoff.