All Projects
Architecture
Monolith to Microservices Migration
Migrated a legacy monolith to AWS microservices with zero downtime using the strangler fig pattern, maintaining 99.9% uptime and scaling to 10,000+ daily transactions.
Overview
A case study in migrating a legacy monolith to microservices on AWS using the strangler fig pattern. Features parallel run testing, API gateway routing, and zero-downtime cutover.
Tech Stack
PythonDjangoFlaskAWSDockerPostgreSQLJenkins
Architecture
Users
Web clients
Load Balancer
AWS ALB
API Gateway
Route old or new
Legacy Monolith
Running in parallel
New Microservices
Django + Flask on ECS
PostgreSQL
Shared during transition
Topics
python
aws
microservices
migration
docker
ecs
Engineering Challenges
Migrating a legacy monolith to microservices while maintaining 99.9% uptime and zero data loss.
Lessons Learned
The strangler fig pattern is the safest migration approach. Running old and new in parallel catches issues before cutover. Never do a big-bang migration.