> For the complete documentation index, see [llms.txt](https://docs.greenstand.org/engineering/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.greenstand.org/engineering/technology.md).

# Technology

The Greenstand tree tracking and impact trading tools are build as Open Source Products. To develop and operate the infrastructure as a service, Greenstand uses the following resources, technology, la

Greenstand's development revolves around technology to collect, verify, and trade claims for environmental and social impact.

The primary Technology is comprised of:

* Mobile apps (iOS and Android) for field data collection. These Treetracker apps allow planters to verify tree planting and tree survival with geo-tagged, time-stamped images.
* A data pipeline and and database for field data ingestion
* A data analysis pipeline including: Admin panel for aging Tree capture details and user management, machine learning data analysis, and script based data analysis. Tree images and data points are analyzed using the treetracker-admin-client.
* A web map, the treetracker-web-map-client, at Treetracker.org displays trees and can be embedded on partner websites, allowing the partner’s clients to see their planted and mapped trees.
* A wallet System and Tools for trading the Greenstand Impact tokens. Using a secure wallet and wallet-api system users create/register wallets and transfer tokens. Each Greenstand Impact Token is based on a verified ecological impact, such as growing trees.
* A Digital Herbarium
* API's for token transfers, data exports etc.

## Technical Details

### Cloud Resources

Greenstand has been built primarily on [Digital Ocean (DO)](https://www.digitalocean.com/) and continues to heavily rely on DO's services. The

| Cloud Resources On Digital Ocean | Description                                                 |
| -------------------------------- | ----------------------------------------------------------- |
| Digital Ocean Droplet            | 4gb Production Core Service                                 |
| Digital Ocean Droplet            | 1gb Production Bastion                                      |
| Digital Ocean Snapshot           | Snap Shots of all could services                            |
| Digital Ocean Database Cluster   | Five Postgresql for Primary, Secondary, and Read Only Nodes |
| Kubernetes Clusters              | Production K8s                                              |
| Spaces                           | 250GB & 1TB Bandwidth                                       |
| DNS                              | Digital Ocean Domain Name Services                          |

| Cloud Resources On AWS | Description           |
| ---------------------- | --------------------- |
| S3 Bucket              | S3 Cloud Storage      |
| EC2                    | Elastic Compute Cloud |
| Sage Maker             | Machine Learning      |

### General

| Tool       | Description                       |
| ---------- | --------------------------------- |
| NodeJS     | scripts and server-side framework |
| JavaScript | programming language              |
| TypeScript | programming language              |
| Python     | programming language              |
| C++        | programming language              |
| Swift      | programming language              |
| Kotlin     | programming language              |
| HCL        | configuration language            |

### Frontend

| Tool      | Description                                                |
| --------- | ---------------------------------------------------------- |
| React     | UI framework                                               |
| NextJS    | front-end framework with routing and server side rendering |
| Storybook | develop and document React components in isolation         |
| Cypress   | automated browser testing tool                             |

### Backend

| Tool      | Description                      |
| --------- | -------------------------------- |
| ExpressJS | server-side framework for NodeJS |

### Code quality and Testing

| Tool     | Description                 |
| -------- | --------------------------- |
| Jest     | automated testing tool      |
| ESLint   | code linter                 |
| Prettier | code formatter              |
| husky    | manage pre-commit git hooks |

### Protocols and specifications

| Tool    | Description                         |
| ------- | ----------------------------------- |
| OpenAPI | specification to describe rest apis |

### Database

| Tool       | Description  |
| ---------- | ------------ |
| PostgreSQL | SQL database |

### Infrastructure

|            |                                                                      |
| ---------- | -------------------------------------------------------------------- |
| Docker     | virtual machine containers for continuous integration and deployment |
| Kubernetes | host docker containers in production                                 |
| Airflow    |                                                                      |
| Terraform  |                                                                      |