AI Engineer for Express.js & Intelligent APIs – UK/USA

With 6+ years of full-stack backend experience, this engineer delivers clean and efficient Express.js APIs wrapped around AI services. From secure GPT endpoints to voice command interfaces and smart data routing, they help teams ship AI tools faster and more reliably.

• LLM Router in Express.js – Built a smart routing system that distributes AI requests across GPT, Claude, and Gemini based on pricing, use case, and context size; improves response consistency by 38%.
  
  GPT Chatbot Platform Backend – Designed a multitenant backend where users train their own chatbots using stored context and prompts; includes analytics, token usage, and admin controls.
  
  Voice Command Transcription API – Developed a secure Express.js endpoint to transcribe, summarize, and assign voice tasks using Whisper + GPT; used by remote field agents.
  
  Real-Time Customer Copilot Engine – Created an Express + WebSocket engine that serves GPT-generated replies to customer service reps in real time, boosting reply speed by 52%.
  
  Generative Blog & SEO Tool – Built a content creation microservice with prompt customization, plagiarism detection, and one-click publishing from a user dashboard.
  
  OpenAI Billing Gateway – Created an Express.js backend that manages OpenAI token usage, billing thresholds, and automated re-authentication for high-usage SaaS apps.