You will get a Claude or GPT AI feature built into your web or mobile app
Project details
If you already have a web or mobile app and you want to add a real AI feature to it, that's the whole job here. A chat assistant, a summarizer, a classifier, smart search over your own data, text extraction, or function calling so the model can do simple things inside your app. Not a rebuild, not a science project. I bolt a clean AI feature onto the app you already have.
I've shipped AI in production. Cloudless is a mobile app I built solo where a Claude-powered coach runs through a secure serverless proxy, so the API key never lands in the browser or on the device. That same pattern is how I'll wire yours: key server-side, responses streamed, prompts tuned against your actual inputs, and proper handling when the model is slow, rate-limited, or returns junk.
I work in Claude or GPT and will tell you which fits your case. Pick a tier, or start with the cheap Proof of Concept so you can see one real model call running in your repo before committing. I work async and send updates as each piece lands.
I've shipped AI in production. Cloudless is a mobile app I built solo where a Claude-powered coach runs through a secure serverless proxy, so the API key never lands in the browser or on the device. That same pattern is how I'll wire yours: key server-side, responses streamed, prompts tuned against your actual inputs, and proper handling when the model is slow, rate-limited, or returns junk.
I work in Claude or GPT and will tell you which fits your case. Pick a tier, or start with the cheap Proof of Concept so you can see one real model call running in your repo before committing. I work async and send updates as each piece lands.
AI Development Type
Knowledge Representation, Model Tuning, Software MaintenanceAI Tools
SonnetAI Development Language
PythonWhat's included
| Service Tiers |
Starter
$350
|
Standard
$1,500
|
Advanced
$3,000
|
|---|---|---|---|
| Delivery Time | 3 days | 7 days | 14 days |
Number of Revisions | 1 | 2 | 3 |
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.
Add a second AI feature
(+ 5 Days)
+$1,200
Usage and cost dashboard
(+ 3 Days)
+$700
Prompt tuning pass
(+ 3 Days)
+$500Frequently asked questions
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PG
Penny G.
Aug 27, 2025
Webflow website addition
About Veldin
Senior Product Engineer | AI, API Integrations, Full-Stack SaaS
Sarajevo, Bosnia and Herzegovina - 1:04 pm local time
The proof, public and clickable:
→ Led the Adobe Marketo Engage app and built the ActiveCampaign app — Marketo is Approved by Webflow and Enhanced-Security certified.
→ Contributed to the official Stripe and PayPal Webflow apps.
→ Built most of Webflow's integration for Slack's MCP launch — Webflow was one of 20+ launch partners alongside Atlassian, Canva, Linear, and Zoom.
I also ship complete products solo, from architecture to deployment:
→ Cloudless — an AI mobile app with a Claude-powered coach behind a secure serverless proxy (React Native)
→ Synqo — a multi-tenant workforce SaaS built solo (auth, scheduling, payroll, real-time dashboards)
→ Dora.ba — a live e-commerce + booking platform (260 products, 118 services)
What I'll build for you:
→ AI features — LLM integrations, AI agents, automation — in new or existing products
→ API & platform integrations — OAuth, webhooks, third-party APIs
→ Full SaaS builds — auth, billing, dashboards, multi-tenant
→ Web & mobile — Next.js, React, React Native
How I work: give me a clear scope and you get it shipped — fast, self-directed, fully async, with written updates at each milestone. No standups or daily syncs (a one-off scoping chat is fine). I'm newer to Upwork than to shipping — most of my work has been senior in-house and direct-client, and everything above is public and verifiable.
Stack: Next.js, React, React Native, Node.js, TypeScript, Python, Postgres/Supabase, Stripe, OAuth/webhooks, Claude/OpenAI.
Portfolio: veldin-portfolio.vercel.app
Steps for completing your project
After purchasing the project, send requirements so Veldin can start the project.
Delivery time starts when Veldin receives requirements from you.
Veldin works on your project following the steps below.
Revisions may occur after the delivery date.
Scope & confirm
I review what you sent and reply with a written scope — exactly what the feature does, which model, and a firm timeline. We lock it before any build starts.
Build it securely
I add the feature to your codebase with the API key behind a server-side proxy, streaming responses, and the prompt tuned to your real inputs.