ES Let’s talk →
stack = [claude, azure, sql server, c#]
Technologies

The technology we put AI to work with.

Claude through the Anthropic API, Azure, SQL Server and C#. It is what we run in production, in our own businesses and in our clients' businesses.

The everyday stack

There are four pieces. All four work together in Recepción24.

AI models: Claude, through the Anthropic API

Within Claude, we pick the model that makes the fewest mistakes where a mistake costs the customer something, even when it is the more expensive one. The agent does more than talk: it uses tools that connect it to the company's systems, to look up an order, check a calendar or open a ticket. The answer is generated as a stream, which is what lets an agent reply on the phone at the pace of a conversation. And the fixed instructions of each agent are cached, so every conversation costs less.

  • Anthropic API
  • Claude
  • Agents with tools
  • Streamed answers
  • Cached instructions

Cloud: Azure

The applications run on Azure App Service, in European data centres. Every change goes live automatically with GitHub Actions. Azure Storage queues hold pending work so that none gets lost, and Application Insights logs the errors. Cloudflare filters the traffic before it reaches the applications.

  • Azure App Service
  • Azure Storage
  • Application Insights
  • GitHub Actions
  • Cloudflare

Data: SQL Server and Azure SQL

A relational database keeps the conversations, what each one cost, and the business data. It is proven technology, with automatic backups and with queries any engineer can read.

  • SQL Server
  • Azure SQL

Code: C# and .NET

The programs that drive the agents, the APIs and the control panels are written in C#, on .NET 10. The screens are built with Blazor. In the voice agents we also use Python, with LiveKit.

  • C#
  • .NET 10
  • ASP.NET Core
  • Blazor
  • Python
  • LiveKit Agents
The rest

What we also use when the project calls for it.

Web and frontend

Corporate sites, portals and SaaS that load fast, rank well and stay easy to maintain.

  • React
  • JavaScript
  • TypeScript
  • Vite
  • HTML5/CSS3
See the service →

Mobile apps

Native when performance rules, cross-platform when the deadline does. We know what breaks when an app grows.

  • Swift
  • SwiftUI
  • Kotlin
  • Jetpack Compose
  • .NET MAUI
  • Flutter
  • React Native
See the service →

Other languages and infrastructure

Node.js, PHP or PostgreSQL when the project is already built with them. AWS, Docker and nginx when the client already has them.

  • Node.js
  • Express
  • PHP
  • PostgreSQL
  • AWS
  • Docker
  • nginx
  • Azure Functions
See the service →

Integrations

Your ERP and your CRM talking to each other, with no copy and paste. If it has an API, we connect it.

  • SAP Business One
  • Dynamics 365
  • Salesforce
  • HubSpot
  • Holded
  • Shopify
  • WooCommerce
  • Stripe
  • WhatsApp Business API
  • Zapier
  • Make
See the service →

CMS and eCommerce

When a CMS solves the problem, we use it and save you months. We do not rewrite for sport.

  • WordPress
  • WooCommerce
  • Shopify
  • Duda
  • Wix
See the service →

Analytics and SEO

Measure what works and show up where people look for you: on Google and in the AI assistants.

  • GA4
  • Google Tag Manager
  • Search Console
  • Hotjar
  • Schema.org
  • hreflang
See the service →

How we choose technology

The everyday stack is the one above. If yours is a different one, these four rules decide:

  • Whatever your team can maintain. If your people work in PHP, we will not force .NET on you.
  • Total cost over two years. Development, maintenance, hiring and licences, not only what it costs to build.
  • No lock-in. The code and the data are yours, and you can take them with you anytime.
  • The simplest tool that solves the problem. If WordPress, Shopify or Duda fixes it, we say so.
Case studies

The stack, in production.

Screenshot of the Recepción24 projectAI receptionist Recepción24

Engine in C#, with Claude and Azure SQL, on Azure App Service.

See case study → Screenshot of the ListingOK projectPricing for short-term rentals ListingOK

Application in Blazor and .NET, with Azure SQL, on Azure App Service.

See case study → Screenshot of the Reparaman projectHome repairs Reparaman

Website in Blazor and .NET 10, on Azure App Service. Its receptionist is a Recepción24 AI agent.

See case study →

See all case studies →

Want to talk it through?

If you want to talk to us, the first call is free. Maybe something comes of it, maybe not, but you will know more by the time we hang up.

Let’s talk →
info@tec2020.com · Madrid, Spain