Charterstone — technology par excellence
Technologies

Modern skills for modern products

We match engineers to the technologies you already use, and help you adopt new ones, including AI, where they deliver real value for your business.

Our stack

Current, supported and production-proven

We favour mature, well-supported technology that your own team can maintain long after we've shipped.

AI

AI and machine learning

  • OpenAI and Azure OpenAI
  • Anthropic Claude
  • LLM integration
  • Retrieval-augmented generation (RAG)
  • AI agents and automation
  • Vector search
  • LangChain
  • PyTorch
  • scikit-learn

Back end and APIs

  • .NET 8 / ASP.NET Core
  • C#
  • Python
  • FastAPI and Django
  • Node.js
  • TypeScript
  • PHP / Laravel
  • REST and GraphQL

Front end and mobile

  • React
  • Next.js
  • Angular
  • Vue.js
  • TypeScript
  • Tailwind CSS
  • React Native
  • Flutter

Data and analytics

  • PostgreSQL
  • SQL Server
  • MySQL
  • MongoDB
  • Redis
  • Power BI
  • Data pipelines and ETL
  • D3.js visualisation

Cloud and DevOps

  • Microsoft Azure
  • Amazon Web Services
  • Google Cloud
  • Docker
  • Kubernetes
  • Terraform
  • GitHub Actions
  • Azure DevOps

Quality and security

  • Automated testing
  • Playwright
  • Cypress
  • xUnit and Jest
  • CI/CD pipelines
  • OWASP secure coding
  • SignalR and WebSockets
Expertise

What we build with them

AI-powered applications

Assistants grounded in your own data, document processing, search and automation agents, using leading models with proper security and cost control.

Modern web platforms

Fast, secure web applications and APIs with .NET, Python and Node.js on the back end, and React, Next.js or Angular on the front end.

Cloud-native and DevOps

Containerised applications on Azure, AWS or Google Cloud, with infrastructure as code and automated build, test and deployment pipelines.

Data and analytics

Well-designed databases, data pipelines and dashboards in Power BI or custom visualisations that turn data into decisions.

Mobile apps

Cross-platform iOS and Android apps with React Native or Flutter, sharing code and skills with your web platform.

Modernisation

Upgrading legacy .NET, PHP and database systems to current, supported technology without disrupting your business.

Exploring AI for your business?

Tell us what you want to achieve. We'll help you find where AI adds real value and build it safely into your systems.

Discuss your requirements