Solsys Technical Assessment

This repository contains solutions for two selected tasks from the Solsys technical assessment.

Task Selection

1. Task 1: Managing Geo-Distributed Data - Design of an active-active architecture for handling concurrent DynamoDB Global Table transactions with conflict resolution and idempotency.

2. Task 4: 3GPP Milenage Authentication - Implementation of a REST API for generating 3G authentication vectors using AWS serverless technologies.

Implementation Note

As specified in the requirements, this repository focuses on:

• Setting up project structures
• Defining interfaces and classes
• Creating unit test strategies
• Explaining architecture and design decisions
• Justifying technical choices

The code is not completely functional with all details implemented, but rather demonstrates the architecture and structure of the solution.

Running Unit Tests using Mocks of AWS Services

This repository includes mock implementations of AWS services to enable testing without actual AWS resources:

• DynamoDB Mocks: Simulates DynamoDB Global Tables for testing event processing and conflict resolution
• Secrets Manager Mocks: Simulates secure storage for authentication keys
• Visualizers: Demonstrates request flows and component interactions
• Mock Crypto Services: Simulates cryptographic operations for 3GPP authentication

To run the tests with mocks, see the "Running the Tests" section in each task's documentation.

Diagrams

Diagrams were generated using the Python diagrams library. To regenerate:

pip install diagrams
python task1_geo_distributed_data_diagram.py
python task4_milenage_authentication_diagram.py

AWS Templates

Infrastructure-as-Code templates are provided in the templates directory for AWS CloudFormation/SAM deployment.