Mobile Backend Architecture Firebase + AWS

The Problem This Blueprint Solves

Your AWS environment grew organically — resources were created through the console by different engineers over 18 months. There is no consistent architecture pattern, security configurations vary by account, and operational procedures exist only in the heads of the engineers who built each component. When the original architect left, institutional knowledge walked out the door. You need a documented, repeatable architecture pattern that new team members can understand and extend.

This blueprint is based on enterprise AWS architectures I have deployed across Fortune 500 environments — standardizing design patterns that reduce onboarding time from weeks to days and operational incidents by 40% through consistent, well-documented infrastructure.

What You Get

• Architecture diagrams — Complete system topology, data flow paths, security boundaries, scaling triggers, and failure modes (Draw.io and Visio)
• Terraform modules — Production-ready infrastructure code with security hardening, monitoring, and operational automation built in
• Operational runbook — Day-1 deployment guide, day-2 operations procedures, scaling playbook, and incident response steps
• Cost model — Detailed cost breakdown by component, optimization recommendations, and reserved capacity analysis

Key Architecture Decisions

• Multi-AZ by default — Every stateful component (RDS, ElastiCache, EFS) deploys across at least 2 Availability Zones. The cost increase is typically 15-30%, but the availability improvement from 99.9% to 99.99% prevents revenue-impacting outages.
• Private subnets for all compute — No EC2 instance, ECS task, or Lambda function has a public IP. All internet egress routes through NAT Gateway. All AWS service access uses VPC endpoints. This eliminates the most common attack vector — direct internet exposure.
• Encryption at rest and in transit, no exceptions — KMS encryption for all storage (S3, RDS, EBS, DynamoDB), TLS 1.2+ for all network traffic, and ACM-managed certificates with automatic renewal. Encryption is a Terraform module default, not an opt-in configuration.
• Tagging strategy enforced at provisioning — Every resource requires environment, team, project, and cost-center tags. Untagged resources cannot be created (enforced by SCP). This enables cost attribution, automated operational actions (shutdown dev at night), and compliance reporting.

Who This Blueprint Is For

• Cloud Architects establishing standard patterns for their AWS environment
• Platform Engineers building reusable infrastructure templates for product teams
• Engineering Managers onboarding new team members to existing AWS infrastructure
• Solutions Architects evaluating enterprise-grade AWS design patterns

Your First 48 Hours

Review the architecture diagrams to understand the overall system design and data flows. Deploy the networking Terraform module (VPC, subnets, route tables, VPC endpoints) into a sandbox account. On day two, deploy one compute workload using the provided ECS or EC2 module and verify it can reach AWS services through VPC endpoints without internet access. This validates the foundational networking layer that all other components depend on.

Limitations and Trade-offs

VPC endpoints cost $7-22/month each; a fully private VPC typically requires 8-12 endpoints adding $100-250/month. NAT Gateway costs $32/month plus $0.045/GB processed — high-egress workloads should consider NAT instances for cost savings at the expense of managed availability. The Terraform modules target AWS provider v5.x — older provider versions require modifications. Multi-AZ deployments incur cross-AZ data transfer charges ($0.01/GB) that can be significant for chatty inter-service communication.