Resilient Microservices Architecture for Transit Comparison

A robust, fault-tolerant microservices system designed to compare transit routes across multiple providers, with built-in resilience against failures.

Architecture Overview

This system demonstrates advanced microservices principles in action, featuring:

• Service Isolation: Each component operates independently to prevent cascading failures
• Resilience Patterns: Circuit breakers, retries, and fallbacks ensure system stability
• Event-Based Communication: MassTransit handles inter-service messaging
• Comprehensive Telemetry: Detailed monitoring across all system components
• Chaos Testing: ChaosMonkey integration to validate fault tolerance

Technical Implementation

Core Technologies

• ASP.NET Core: Backend framework powering the microservices
• Docker: Containerization for consistent deployment
• MassTransit: Message bus for reliable inter-service communication
• STM & TomTom APIs: Data providers for transit information
• Distributed Tracing: End-to-end request monitoring

Resilience Strategies

The architecture was specifically designed to handle failure scenarios:

1. Network Partitions: Services continue operating with degraded functionality when isolated
2. API Outages: Fallback mechanisms provide alternative data sources
3. Resource Exhaustion: Graceful degradation under load
4. Service Restarts: State recovery and request replay mechanisms

Documentation & Process

Documentation was a key focus of this project, including:

• Comprehensive architecture diagrams
• Failure scenario analysis and mitigations
• Clear team task allocation with traceability
• Performance and reliability metrics

This project demonstrates how to build truly resilient systems that maintain functionality even under adverse conditions.