Case Study

Cloud Refactoring & Modernization
on AWS

From legacy silos to secure, event-driven services and analytics on Amazon Redshift – aligned to federal guidance.

24 services

Microservices delivered

AWS + Redshift

Target data platform

CI/CD gated

Quality & security checks

Parallel run

Phased cutover approach

Snapshot

Client

Selective Service System (SSS)

Industry

Federal – National Service & Readiness

Compliance

NIST 800-53 R5 • EO 14028 • FedRAMP

Mission & Challenge 

Modernize the Registration, Compliance & Verification (RCV) system by transitioning from legacy components to an AWS-native approach – refactoring into microservices, implementing secure automated pipelines, and enabling analytics on Amazon Redshift – without disrupting ongoing operations.

What We Did

Refactor

  • Decomposed legacy functions into 24 microservices
  • Standardized REST APIs and contracts
  • Dockerized workloads (ECS/EKS or equivalent)

Replatform

  • Established the data platform on Amazon Redshift
  • Built event-driven ingestion via S3 + Lambda
  • Executed a parallel run to de-risk cutover

Operationalize

  • Implemented CI/CD with security/quality gates
  • Adopted IaC (Terraform/CloudFormation) for repeatable deploys
  • Centralized logging and alerting with CloudWatch

Ribbon in black

  • 24 Services
  • AWS + Redshift Platform
  • CI/CD Gated Pipelines
  • Parallel Cutover

24

Services

AWS + Redshift

Platform

CI/CD gated

Gated Pipelines

Parallel

Cutover

Impact to Date

  • Reusable integration pattern for partner file ingestion (S3 → event processing)
  • Repeatable deployments through gated CI/CD and IaC
  • Improved test discipline: structured UAT cycles with defect triage and evidence
  • Analytics-ready data on Redshift to support compliance and reporting
  • Lower operational risk via parallel run and phased migrations

Tools & Platforms

Amazon S3

File ingress, staging

Amazon Redshift

Analytics & reporting

API Gateway

Compute & Integration

SQS/EventBridge

Messaging & Events

Defender for Cloud

Cloud Posture & Alerts

CodePipeline/

CodeBuild

CI/CD with gates

IAM, Secrets Manager

Identity & Secrets

CloudWatch

Logs, metrics, alerts

Controls Mapping

  • EO 14028: Supply-chain checks in CI/CD, artifact provenance, automated gates
  • NIST 800-53 R5:
  • AC (Access Control): IAM roles/least privilege
  • CM (Configuration Management): IaC, pipeline-enforced changes
  • CP (Contingency Planning): DR playbooks and parallel run procedures
  • AU (Audit & Accountability): Centralized logs, exportable evidence
  • FedRAMP: Inheritance leveraged where applicable; controls tied to runbooks/evidence

Delivery Details

  • Pipelines: CodePipeline/CodeBuild with ZAP & SonarQube checks
  • IaC: Terraform/CloudFormation; per-environment promotion & drift detection
  • Observability: CloudWatch dashboards/alerts; audit evidence exports
  • Runbooks: UAT/production deploys, data backfill, DR tests
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