Add AI to your C# / ASP.NET Core application: summarise, classify, extract or translate text with the OpenAI, Azure OpenAI or Anthropic Claude API, built the production way, with keys in configuration, structured output, validation, retries and cost limits.

What you get: the AI feature behind a clean service class or API endpoint; prompt design with structured JSON output your code can rely on; error handling, timeouts, retries, token and cost limits and logging; a human review step where a wrong answer would be costly; and a short written note on how to change the prompts. The feature is built into your own app and stays there as source code you can use and modify; Rui Codex's reusable components are licensed for your use.

Delivered example: EveryTranslate, Rui Codex's own AI translation SaaS (100+ languages, document translation with preserved formatting, a developer REST API and subscriptions), built with ASP.NET Core and AI APIs.

Packages (fixed price, USD):

Quick add - $150, 2 days (about 2 hours of work): one AI call added to your existing .NET app (for example summarise, classify, extract or translate) behind a method or endpoint.

AI feature - $600, 4 days (about 8 hours): one AI feature with prompt design, structured output, validation, retries, token and cost limits and logging.

AI assistant - $1,800, 7 days (about 24 hours): an assistant or document workflow that answers from your own data (database records or documents), with a simple UI or API, usage limits and an admin review step.

The price shown on this service is the Quick add. For the larger packages, send a message with your scope and I will reply with a written plan and a matching offer.

How it works: you keep your own API keys and pay the AI provider directly; I build and test with a test key you provide. Async-first, in writing.