Full-Stack AI Engineer - SaaS

Looking for a contract Full-Stack AI Engineer to ship a multi model SaaS (4–6 weeks).

We’re building a multi-model AI chat with smart orchestration. The good part: we already have substantial code and starter repos generated by ChatGPT:

AI Orchestration (Node + Python): Fastify SSE gateway, FastAPI router with scoring & fallbacks, adapters for OpenAI/Anthropic/Google/Mistral/DeepSeek/Perplexity/Groq/OpenRouter/Together/Cohere, plus Azure OpenAI and AWS Bedrock. Safety pre-check (Azure Content Safety) + PII redaction. Eval harness. Minimal Next.js chat UI.

Backend (Spring Boot): endpoints for /usage/report, Tap payments (checkout + webhook), subscriptions, usage aggregation (optional—nice to have for MVP).