LLM & API Integration for Existing Web Apps (Gemini)Jan A.
Already have a web app? I add AI features to it without turning your codebase upside down: a small server-side API that calls the Gemini API, returns schema-constrained JSON your UI can trust, and fails gracefully when the model is slow or unavailable.
What I build
A server-side proxy so API keys never reach the browser
Prompt design with strict JSON response schemas
Fallback behaviour when the model is unavailable
UI wiring in your existing React app
Examples I have built: spending analysis, tone analysis, proposal drafting, coaching insights, job-to-project matching
Related proof in my Work section
ProofOfWork and Subscope (server-side Gemini endpoints with deterministic fallbacks).
What I need from you
Repository access or a short walkthrough of your app
The AI feature you want and what the output should look like
A Gemini API key (or I help you set one up)
Starting price for one AI feature. Final quote after scoping.
Starting at$400
Duration1 week
Tags
ExpressJS
Firebase
Google Gemini
Node.js
React
Supabase
TypeScript
AI Engineer
Prompt Engineer
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Jan A. Pakistan
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LLM & API Integration for Existing Web Apps (Gemini)Jan A.
Starting at$400
Duration1 week
Tags
ExpressJS
Firebase
Google Gemini
Node.js
React
Supabase
TypeScript
AI Engineer
Prompt Engineer
Already have a web app? I add AI features to it without turning your codebase upside down: a small server-side API that calls the Gemini API, returns schema-constrained JSON your UI can trust, and fails gracefully when the model is slow or unavailable.
What I build
A server-side proxy so API keys never reach the browser
Prompt design with strict JSON response schemas
Fallback behaviour when the model is unavailable
UI wiring in your existing React app
Examples I have built: spending analysis, tone analysis, proposal drafting, coaching insights, job-to-project matching
Related proof in my Work section
ProofOfWork and Subscope (server-side Gemini endpoints with deterministic fallbacks).
What I need from you
Repository access or a short walkthrough of your app
The AI feature you want and what the output should look like
A Gemini API key (or I help you set one up)
Starting price for one AI feature. Final quote after scoping.
$400