Enterprise Authentication, Authorization and User Management

Improving

Senior Software Engineer

Project Overview

Developed and maintained a comprehensive user management microservice handling authentication, authorization, and user lifecycle management for enterprise-scale multi-tenant SaaS platform. Built to serve thousands of users across multiple organizations with complex authorization requirements.

Key Achievements

Authentication & Authorization System

  • Built robust REST APIs for user management, role-based access control (RBAC), and organization onboarding using Go, Chi router, and OpenAPI specifications
  • Integrated Auth0 authentication platform with custom role and permission management
  • Supported social connections, machine-to-machine authentication, and enterprise identity providers
  • Developed sophisticated authorization system with hierarchical permissions and policy-based access control

Database & Data Architecture

  • Designed and implemented CosmosDB data layer with optimized queries for user, role, and organization management
  • Implemented proper partitioning strategies across multiple containers for sub-second response times
  • Built efficient data models with optimized partition keys and query patterns

Enterprise Features

  • Implemented fine-grained workload tenant permissions for Azure and Kubernetes services
  • Built organization lifecycle management including automated onboarding and user invitations
  • Developed group management and complete organization deletion workflows
  • Created service account management with client credentials flow for machine-to-machine authentication

Platform Integration

  • Integrated Azure Key Vault for secrets management
  • Built automated organization onboarding with Auth0 integration and custom domain validation
  • Implemented Microsoft tenant discovery capabilities

Quality & Observability

  • Implemented comprehensive testing suite including unit tests, integration tests with CosmosDB
  • Developed table-driven test patterns achieving high code coverage
  • Established observability patterns using OpenTelemetry and structured logging with Clues
  • Built comprehensive error handling with context propagation

Technical Highlights

  • Authorization Matrix: Supporting 100+ permissions across different workload types
  • Multi-tenant Architecture: Scalable design serving thousands of users across multiple organizations
  • Testing Excellence: Comprehensive unit and integration testing with GoMock

Technologies Used

  • Backend: Go, Chi Router, OpenAPI/Swagger code generation
  • Authentication: Auth0, RBAC, policy-based authorization
  • Database: Azure CosmosDB
  • Cloud Services: Azure Key Vault, EventHub
  • Architecture: Microservices, multi-tenant SaaS, event-driven architecture
  • Observability: OpenTelemetry, structured logging, comprehensive error handling
  • Testing: Unit tests, integration tests, table-driven patterns, GoMock
  • DevOps: Containerization, auto-generated Dockerfiles