You will get I will build an AI-powered web app feature with LLM integration
Rising Talent
Project details
I integrate LLMs (Claude, OpenAI) into web apps — chatbots, text analysis, content generation, classification, or summarization.
The part most people get wrong is reliability. A raw LLM returns free text, which breaks the moment your app tries to use it. I build with structured output and validation, so responses come back in a consistent format your app can actually depend on, with fallback handling for when the API fails.
I've shipped two live products solo, both running LLM features in production for real users — including an AI coach that follows structured behavioural logic to produce consistent output, not random text.
My stack: Next.js, React, TypeScript, Node.js, Supabase/PostgreSQL, Anthropic and OpenAI APIs.
I work fast using AI-assisted development, which means you get a working feature quickly without cutting corners on reliability. You get the full source code on delivery.
Message me before ordering so we can confirm the scope fits.
The part most people get wrong is reliability. A raw LLM returns free text, which breaks the moment your app tries to use it. I build with structured output and validation, so responses come back in a consistent format your app can actually depend on, with fallback handling for when the API fails.
I've shipped two live products solo, both running LLM features in production for real users — including an AI coach that follows structured behavioural logic to produce consistent output, not random text.
My stack: Next.js, React, TypeScript, Node.js, Supabase/PostgreSQL, Anthropic and OpenAI APIs.
I work fast using AI-assisted development, which means you get a working feature quickly without cutting corners on reliability. You get the full source code on delivery.
Message me before ordering so we can confirm the scope fits.
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance OptimizationWhat's included
| Service Tiers |
Starter
$400
|
Standard
$850
|
Advanced
$1,600
|
|---|---|---|---|
| Delivery Time | 5 days | 10 days | 18 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 1 | 3 | 5 |
Design Customization | - | ||
Content Upload | - | ||
Responsive Design | |||
Source Code |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$150 - $600
Additional Revision
+$100
Additional Page
(+ 2 Days)
+$200Frequently asked questions
About Jakub
AI App Developer | I build & ship SaaS products fast with AI
Liberec, Czech Republic - 9:18 pm local time
I'm not a traditional developer who hand-writes every line. My strength is directing AI (Claude Code) to turn an idea into a working, live product: I handle the architecture, integrations, payments, and getting it deployed to real users. Shipping is the skill — and I've proven I can do it.
What I've built solo:
• Tradeventure (tradeventure.app) — a SaaS trading journal with an AI coach. Live Stripe payments, user authentication, Binance API integration, and a gamified engine. Full GDPR compliance.
• Steer It (steerit.app) — a real-time multiplayer browser game where your phone becomes the controller via QR code. Custom real-time netcode and physics.
What I can do for you:
• Build an MVP or web app from idea to live product
• Integrate AI / LLMs into your product (chatbots, AI features, automations)
• Wire up payments (Stripe), auth, databases (Supabase/PostgreSQL)
• Fix, extend, or finish an existing app
My stack: React, Next.js, TypeScript, Supabase, Stripe, and AI tools throughout.
Background: I'm a former professional MMA fighter, so I bring discipline, speed, and a bias for finishing what I start. I communicate clearly, move fast, and care about the result — not just closing a ticket.
Tell me what you want built, and I'll get it live.
Steps for completing your project
After purchasing the project, send requirements so Jakub can start the project.
Delivery time starts when Jakub receives requirements from you.
Jakub works on your project following the steps below.
Revisions may occur after the delivery date.
Scope & setup
We confirm exactly what the AI feature should do, what a good result looks like, and I review your stack and sample data.
Build the AI layer
I implement the LLM integration with structured output, validation, and fallback handling so the responses are consistent and reliable.