You will get an AI-powered app with Claude API or OpenAI in Next.js
Project details
You will get a custom AI-powered application built with Claude API, OpenAI, or both, integrated into a clean Next.js front end. Whether you need a chatbot, an internal AI tool, a content generator, a document analyzer, or a full agent that can use tools and search through your knowledge base, I deliver production-ready AI apps that actually work.
What you get: a fully working web application with streaming responses, conversation history, authentication, and a clean modern UI. Built with Next.js, TypeScript, the Vercel AI SDK, and your choice of model provider (Anthropic Claude, OpenAI, or both).
What sets my work apart: I do not just plug in an API and call it done. I write proper prompts, handle errors and rate limits, manage context windows, and build real evaluation into the app so you know it works. I also write a clear technical spec before quoting, so you know exactly what features are in scope.
If you need a chatbot, an AI assistant for your team, a RAG system over your documents, or an autonomous agent that uses tools, this is the build that will ship fast and not break in production.
What you get: a fully working web application with streaming responses, conversation history, authentication, and a clean modern UI. Built with Next.js, TypeScript, the Vercel AI SDK, and your choice of model provider (Anthropic Claude, OpenAI, or both).
What sets my work apart: I do not just plug in an API and call it done. I write proper prompts, handle errors and rate limits, manage context windows, and build real evaluation into the app so you know it works. I also write a clear technical spec before quoting, so you know exactly what features are in scope.
If you need a chatbot, an AI assistant for your team, a RAG system over your documents, or an autonomous agent that uses tools, this is the build that will ship fast and not break in production.
AI Development Type
Knowledge Representation, Software MaintenanceWhat's included
| Service Tiers |
Starter
$1,200
|
Standard
$3,500
|
Advanced
$7,500
|
|---|---|---|---|
| Delivery Time | 10 days | 21 days | 35 days |
Number of Revisions | 2 | 3 | 10 |
AI Model Integration | |||
Detailed Code Comments | |||
Knowledge Graph | - | - | - |
Model Documentation | - | ||
Ontology | - | - | - |
Source Code | |||
Taxonomy | - | - | - |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$500 - $3,000
Additional Revision
+$300
Vector Database & RAG Setup
(+ 5 Days)
+$900
Custom Tool Integration
(+ 3 Days)
+$500
Usage Tracking & Cost Dashboard
(+ 4 Days)
+$650Frequently asked questions
About Elvis
Software Engineer
Santo Domingo, Dominican Republic - 11:44 pm local time
Most of my clients come to me with one of three problems:
1. "I need a landing page that actually converts." Built with Next.js, Tailwind, and Framer Motion. Fast, animated, mobile-first, deployed on Vercel. Usually live in 5 to 10 days.
2. "Shopify is too limiting, I need a custom storefront." Headless e-commerce on Next.js with Stripe and PayPal, custom admin dashboard, full control over UX, SEO, and performance. 3 to 5 weeks to MVP.
3. "I need to build my SaaS, but I don't have a CTO." Full-stack Next.js apps with auth, multi-tenant architecture, role-based permissions, dashboards, and clean APIs. I write detailed specs before I write code, so you know exactly what you're paying for.
I also build AI-powered features like Claude API, OpenAI, RAG systems, custom chatbots, and AI-augmented internal tools, either as standalone projects or integrated into your existing app.
My stack:
Next.js 15/16, React 19, TypeScript, Tailwind, shadcn/ui, Framer Motion, GSAP, Stripe, PayPal, Postgres, Supabase, Insforge, Resend, Vercel, Claude API, OpenAI API.
What you can expect when working with me:
• I write a clear technical spec before quoting, so there's no vague scope and no surprise change orders.
• I use modern AI tools (Claude Code, v0, Cursor) to deliver in days what used to take weeks, without cutting quality.
• I'm based in the Dominican Republic, fully fluent in English, and overlap with US Eastern time.
• I communicate like an engineer, not a freelancer: clean updates, honest timelines, no ghosting.
If you're not sure exactly what you need yet, send me your idea or your current site and I'll send back a short technical assessment with a fixed quote and timeline. No commitment.
Let's build something.
Steps for completing your project
After purchasing the project, send requirements so Elvis can start the project.
Delivery time starts when Elvis receives requirements from you.
Elvis works on your project following the steps below.
Revisions may occur after the delivery date.
Discovery & spec
I review your use case, choose the right model and architecture, and send back a one-page spec covering features, prompts, integrations, and timeline.
Prompt engineering & prototyping
I design and test the prompts, system instructions, and tool definitions. You see early outputs before development to confirm the AI behaves as expected.