Theo Tappe
53 lines
2.5 KiB
Markdown
53 lines
2.5 KiB
Markdown
#### Motivation
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This application was developed by Theo Tappe as a comprehensive technical showcase for my application and to have some fun with friends.
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It demonstrates a full-stack approach, combining cross-platform development with a robust, automated infrastructure.
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#### Frontend Architecture
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- **Native Performance via KMP**:
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By leveraging Kotlin Multiplatform, the app compiles to native binaries.
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This ensures the UI remains fluid and responsive, meeting the high performance standards of modern applications.
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- **Maximum Code Reuse with Compose Multiplatform**:
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The entire UI layer is built using Compose Multiplatform, sharing code across all supported platforms.
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This ensures feature parity and allows a single developer to maintain a multi-platform ecosystem efficiently.
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- **End-to-End Type Safety**:
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To eliminate integration errors, Data Transfer Objects (DTOs) are shared between the frontend and backend.
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This creates a "Single Source of Truth," ensuring the app and server are always in sync and reducing bugs during API communication.
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#### Backend Setup
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- **Zero-Trust Validation**:
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While the client provides instant feedback for a smooth UX, all data is strictly validated on the backend.
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This ensures the system remains secure and resilient against manipulated client-side requests.
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- **Financial Data Integrity**:
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To avoid the precision errors common with floating-point math,
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money is handled via a dedicated Cash class using Long values for both major and minor units,
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which ensures accuracy for all financial calculations.
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- **Real-World Data Integration**:
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The application integrates with the Alpaca API to fetch market data.
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#### Infrastructure & DevOps
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The application is deployed on a self-managed production environment that I have maintained for several years,
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hosting services like Nextcloud, GitLab, Homeassistant or Vaultwarden (Bitwarden server).
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This project follows Infrastructure as Code principles:
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- **Orchestration with Kubernetes via K3S**:
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Backend services are containerized and managed within a K3S cluster.
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This setup ensures high availability, automated rollouts, and efficient resource management.
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- **Reproducible Systems via NixOS**:
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K3S runs on NixOS, allowing for entirely declarative and reproducible system configurations.
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This minimizes "it works on my machine" issues and ensures a stable production environment.
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- **Virtualization with Proxmox**:
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The entire stack is hosted on a Proxmox VE cluster.
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This allows me to manage an internal network including TrueNAS for storage, OPNsense for networking and NixOS for deploying.
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